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20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 17)

Ở cừu, kiểu gen HH quy định có sừng, kiểu gen hh quy định không sừng, kiểu gen Hh hiện có sừng ở cừu đực và không sừng ở cừu cái. Gen này nằm trên nhiễm sắc thể thường. Cho lai cừu đực không sừng với cừu cái có sừng được F1, cho F1 giao phối với nhau được F2. Tính theo lí thuyết, tỉ lệ kiểu hình ở F1 và F2 là:

Sinh học Tốt nghiệp THPT
Xem chi tiết 516 lượt xem 6 năm trước
ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.Prior to 1900, how many inhabitants would a town have to have before being defined as urban?

Tiếng Anh Tốt nghiệp THPT
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following question.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề thi thử THPTQG môn Vật lí năm 2020 cực hay có lời giải (Đề số 11)

Một chất điểm tham gia đồng thời hai dao động điều hòa cùng phương cùng tần số. Độ lệch pha của hai dao động là π2. Tại thời điểm t dao động thứ nhất có li độ 5 cm và đang giảm, dao động thứ hai có li độ -12 cm. Biên độ dao động của chất điểm là

Vật lý Tốt nghiệp THPT
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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Trong phản ứng hạt nhân không có định luật bảo toàn khối lượng vì các hạt nhân của các nguyên tố khác nhau có

Vật lý Tốt nghiệp THPT
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Luyện tập trang 119-120

Một dụng cụ gồm một phần có dạng hình trụ, phần còn lại có dạng hình nón. Các kích thước cho trên hình 100. Hãy tính:Thể tích của dụng cụ này.Hình 100 

Toán Lớp 9
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following question. 

Tiếng Anh Tốt nghiệp THPT
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20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 17)

Một quần thể ngẫu phối, ở thế hệ xuất phát có thành phần kiểu gen là: 0,36AA + 0,48Aa + 0,16aa = 1. Khi trong quần thể này, các cá thể có kiểu gen dị hợp có sức sống và khả năng sinh sản cao hơn hẳn so với các cá thể có kiểu gen đồng hợp thì:

Sinh học Tốt nghiệp THPT
Xem chi tiết 470 lượt xem 6 năm trước
ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.The Census Bureau first used the term “SMSA” in

Tiếng Anh Tốt nghiệp THPT
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. It may be inferred from the passage that Amelia Earhart __________.

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Khi chiếu một chùm ánh sáng trắng mảnh, hẹp đi từ thuỷ tinh ra không khí theo hướng vuông góc với mặt phân cách thì

Vật lý Tốt nghiệp THPT
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Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 18)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.Our new coach is popular________the whole team

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 23.5 K lượt xem 6 năm trước
ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.By 1970, what proportion of the population in the United States did NOT live in an SMSA?

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Biên độ của dao động cưỡng bức không phụ thuộc vào

Vật lý Tốt nghiệp THPT
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20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 17)

Ở gà, gen quy định màu sắc lông nằm trên vùng không tương đồng của nhiễm sắc thể giới tính X có hai alen, alen A quy định lông vằn trội hoàn toàn so với alen a quy định lông không vằn. Gen quy định chiều cao chân nằm trên nhiễm sắc thể thường có 2 alen, alen B quy định chân cao trội hoàn toàn so với alen b quy định chân thấp. Cho gà trống lông vằn, chân thấp thuần chủng giao phối với gà mái lông không vằn, chân cao thuần chủng thu được F1. Cho F1 giao phối với nhau để tạo ra F2. Dự đoán nào sau đây về kiểu hình ở F2 là đúng?

Sinh học Tốt nghiệp THPT
Xem chi tiết 356 lượt xem 6 năm trước
ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. The word “it” in the third paragraph refers to _______________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 436 lượt xem 6 năm trước
Tổng hợp đề thi thử THPTQG môn Vật lí năm 2020 cực hay có lời giải (Đề số 11)

Hai chất điểm dao động điều hòa có li độ phụ thuộc thời gian được biểu diễn như hình vẽ. Biết t2−t1= 3,75 s và t3−t2= 3,0 s. Khi chất điểm thứ nhất có giá trị vận tốc v1= π3 cm/s thì giá trị gia tốc chất điểm thứ hai gần trị nào sau đây nhất ?

Vật lý Tốt nghiệp THPT
Xem chi tiết 1.6 K lượt xem 6 năm trước
ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.Which of the following is NOT true of an SMSA?

Tiếng Anh Tốt nghiệp THPT
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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Nhận xét nào dưới đây là đúng? Ánh sáng huỳnh quang 

Vật lý Tốt nghiệp THPT
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Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 18)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.Some candidates failed the oral examination because they didn’t have enough  ________.

Tiếng Anh Tốt nghiệp THPT
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. The word “undisputed” in the third paragraph is closest in meaning to __________. 

Tiếng Anh Tốt nghiệp THPT
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Luyện tập trang 119-120

Hãy điền đủ vào các ô trống cho ở bảng sau (đơn vị độ dài: cm):

Toán Lớp 9
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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Cho bước sóng vạch quang phổ khi electron chuyển từ quỹ đạo dừng N về L là 0,487 μm. Trong nguyên tử hiđrô, electron chuyển từ quỹ đạo L (n = 2) lên quỹ đạo N (n = 4) là do

Vật lý Tốt nghiệp THPT
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20 đề thi thử THPTQG môn Sinh học năm 2019 - 2020 (Đề số 17)

Ở một loài thực vật, tính trạng màu sắc hoa do một cặp gen quy định, tính trạng hình dạng quả do vật cặp gen khác quy định. Cho cây hoa đỏ, quả tròn thuần chủng giao phấn với cây hoa vàng quả bầu dục thuần chủng (P) thu được F1 gồm 100% cây hoa đỏ, quả tròn. Cho các cây F1 tự thụ phấn thu được F2 gồm 4 loại kiểu hình, trong đó cây hoa vàng quả tròn chiếm tỷ lệ 16%. Biết trong quá trình phát sinh giao tử đực và giao tử cái đều xảy ra hoán vị gen với tần số như nhau. Trong các kết luận sau đây, có bao nhiêu kết luận đúng với phép lai trên?(1) Theo lý thuyết, ở F2 có 10 kiểu gen.(2) Theo lý thuyết, ở F2 có 5 loại kiểu gen cùng quy định kiểu hình hoa đỏ quả tròn.(3) Theo lý thuyết, ở F2 số cá thể có kiểu gen giống kiểu gen của F1chiếm tỷ lệ 26%.(4) Theo lý thuyết F1 xảy ra hoán vị gen với tần số 40%.(5) Theo lý thuyết, ở F2 số cá thể có kiểu gen quy định kiểu hình hoa đỏ quả tròn dị hợp về một cặp gen chiếm tỷ lệ 24%.(6) Theo lý thuyết, ở F2 có 2 loại kiểu gen cùng quy định kiểu hình hoa đỏ quả bầu dục.

Sinh học Tốt nghiệp THPT
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. Amelia Earhart eas called “Lady Lindy” because _____________. 

Tiếng Anh Tốt nghiệp THPT
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ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.According to the passage, why did the Census Bureau revise the definition of urban in 1950?

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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. The word “sensation” in the second paragraph is closest in meaning to __________. 

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Đề thi thử THPT Quốc Gia môn Tiếng anh năm 2020 (Đề số 18)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.They always kept on good________with their next-door neighbors for the children’s sake

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Tổng hợp đề thi thử THPTQG môn Vật lí năm 2020 cực hay có lời giải (Đề số 11)

Đặt điện áp u = 1002cos100πt V vào hai đầu đoạn mạch mắc nối tiếp gồm một điện trở thuần, một cuộn dây thuần cảm có độ tự cảm L = 1π H, và một tụ điện có điện dung C thay đổi được. Điều chỉnh C từ giá trị 50π µF đến 80π µF thì công suất tiêu thụ của mạch

Vật lý Tốt nghiệp THPT
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ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.According to the passage, the population of the United States was first classified as rural or urban in

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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. According to the passage, when did Amelia Earhart began her first flight _______.

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Tuyển tập 25 đề thi thử thpt quốc gia môn Vật lý có lời giải chi tiết (P5)

Khi nói về sóng âm, phát biểu nào sau đây là sai?

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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Trạng thái dừng của nguyên tử là

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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. According to the passage, which of the following statements about Earhart is NOT true?

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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Khi tăng khối lượng vật nặng của con lắc đơn lên 2 lần và giữ nguyên điều kiện khác thì

Vật lý Tốt nghiệp THPT
Xem chi tiết 462 lượt xem 6 năm trước
ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50.The changing profile of a city in the United States is apparent in the shifting definitions used by the United States Bureau of the Census. In 1870 the census officially distinguished the nation's “urban” from its “rural” population for the first time. “Urban population” was defined as persons living in towns of 8,000 inhabitants or more. But after 1900 it meant persons living in incorporated places having 2,500 or more inhabitants. Then, in 1950 the Census Bureau radically changed its definition of “urban” to take account of the new vagueness of city boundaries. In addition to persons living in incorporated units of 2,500 or more, the census now included those who lived in unincorporated units of that size, and also all persons living in the densely settled urban fringe, including both incorporated and unincorporated areas located around cities of 50,000 inhabitants or more. Each such unit, conceived as an integrated economic and social unit with a large population nucleus, was named a Standard Metropolitan Statistical Area (SMSA).          Each SMSA would contain at least (a) one central city with 50,000 inhabitants or more or (b) two cities having shared boundaries and constituting, for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000. Such an area included the county in which the central city is located, and adjacent counties that are found to be metropolitan in character and economically and socially integrated with the county of the central city. By 1970, about two-thirds of the population of the United States was living in these urbanized areas, and of that figure more than half were living outside the central cities.While the Census Bureau and the United States government used the term SMSA (by 1969 there were 233 of them), social scientists were also using new terms to describe the elusive, vaguely defined areas reaching out from what used to be simple “towns” and “cities”. A host of terms came into use: “metropolitan regions,” “polynucleated population groups”, “conurbations,” “metropolitan clusters,” “megalopolises,” and so on.What does the passage mainly discuss?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 0.9 K lượt xem 6 năm trước
Luyện tập trang 119-120

Hãy tính diện tích xung quanh của hình nón cụt biết hai bán kính đáy là a, b (a < b) và độ dài đường sinh là l (a, b, l có cùng đơn vị đo).

Toán Lớp 9
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Tuyển tập 25 đề thi thử thpt quốc gia môn Vật lý có lời giải chi tiết (P5)

Người ta truyền tải một công suất điện P từ một trạm hạ áp đến nơi tiêu thụ, điện áp ở hai đầu dây tải điện từ trạm là U, điện trở của đường dây là R, độ lệch phương án giữa điện áp và cường độ dòng điện trên dây là φ. Hiệu suất của sự tải điện được xác định bởi hệ thức:

Vật lý Tốt nghiệp THPT
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Luyện tập trang 119-120

Hình khai triển của mặt xung quanh của một hình nón là một hình quạt, bán kính hình quạt đó là 16cm, số đo cung là 120o. Tang của nửa góc ở đỉnh của hình nón là:

Toán Lớp 9
Xem chi tiết 10.4 K lượt xem 1 năm trước
ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Amelia Earhart was born in Kansas in 1897. Thirty one years later, she received a phone call that would change her life. She was invited to become the first woman passenger to cross the Atlantic Ocean in a plane. The flight took more than 20 hours – about three times longer than it routinely takes today to cross the Atlantic by plane. Earhart was twelve years old before she ever saw an airplane, and she didn’t take her first flight until 1920. But she was so thrilled by her first experience in a plane that she quickly began to take flying lessons. She wrote, “As soon as I left the ground, I knew I myself had to fly.” After that flight Earhart became a media sensation. She was given a ticker tape parade down Broadway in New York and even president Coolidge called to congratulate her. Because her record – breaking career and physical appearance were similar to pioneering pilot and American hero Charles Lindbergh, she earned the nickname “Lady Lindy.” She wrote a book about her flight across the Atlantic, called 20 Hrs, 40 Min. Earhart continued to break records, and also polised her skills as a speaker and writer, always advocating women’s achievements, especially in aviation. Her next goal was to achieve a transatlantic crossing alone. In 1927 Charles Lindbergh became the first person to make a solo nonstop flight across the Atlantic. Five years later, Earhart became the first woman to repeat that feat. Her popularity grew even more and she was the undisputed queen of the air. She then wanted to fly around the world, and in June 1973 she left Miami with Fred Noonan as her navigator. No one knows why she left behind important communication and navigation instruments. Perhaps it was to make room for additional fuel for the long flight. The pair made it to New Guinea in 21 days and then left for Howland Island, a tiny island in the middle of the Pacific Ocean. The last communication from Earhart and Noonan was on July 2, 1937 with a nearby Coast Guard ship. The United States Navy conducted a massive search for more than two week but no trace of the plane or its passengers was ever found. Many people believe they got lost simply ran out of fuel and died. With which of the following subject is the passage mainly concerned? 

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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Một vật dao động điều hòa có đồ thị biểu diễn sự phụ thuộc của li độ theo thời gian như hình vẽ . Phương trình dao động của vật là 

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Tổng hợp đề thi thử THPTQG môn Vật lí năm 2020 cực hay có lời giải (Đề số 11)

Đặt điện áp xoay chiều u =U0 cos2πTt+φ V vào hai đầu đoạn mạch AB như hình bên. Biết R = r. Đồ thị biểu diễn điện áp uAN và uMB như hình vẽ bên cạnh. Giá trị U0bằng

Vật lý Tốt nghiệp THPT
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ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 43.The hard, rigid plates that form the outermost portion of the Earth are about 100 kilometers thick. These plates include both the Earth's crust and the upper mantle. The rocks of the crust are composed mostly of minerals with light elements, like aluminum and sodium, while the mantle contains some heavier elements, like iron and magnesium. Together, the crust and upper mantle that form the surface plates are called the lithosphere. This rigid layer floats on the denser material of the lower mantle the way a wooden raft floats on a pond. The plates are supported by a weak, plastic layer of the lower mantle called the asthenosphere. Also like a raft on a pond, the lithospheric plates are carried along by slow currents in this more fluid layer beneath them.With an understanding of plate tectonics, geologists have put together a new history for the Earth's surface. About 200 million years ago, the plates at the Earth's surface formed a “supercontinent” called Pangaea. When this supercontinent started to tear apart because of plate movement, Pangaea first broke into two large continental masses with a newly formed sea that grew between the land areas as the depression filled with water. The southern one — which included the modern continents of South America, Africa, Australia, and Antarctica — is called Gondwanaland. The northern one — with North America, Europe, and Asia — is called Laurasia. North America tore away from Europe about 180 million years ago, forming the northern Atlantic Ocean. Some of the lithospheric plates carry ocean floor and others carry land masses or a combination of the two types. The movement of the lithospheric plates is responsible for earthquakes, volcanoes, and the Earth's largest mountain ranges. Current understanding of the interaction between different plates explains why these occur where they do. For example, the edge of the Pacific Ocean has been called the “Ring of Fire” because so many volcanic eruptions and earthquakes happen there. Before the 1960's, geologists could not explain why active volcanoes and strong earthquakes were concentrated in that region. The theory of plate tectonics gave them an answer.In line 27, the word “concentrated” is closest in meaning to which of the following?

Tiếng Anh Tốt nghiệp THPT
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the (36) _________ of overweight people is at a new high. As people frantically search for a solution to this problem, they often try some of popular fad diet being offered. Many people see fad diet (37) ______ harmless ways of losing weight, and they are grateful to have them. Unfortunately, not only do fad diet usually fo the trick but also they can actually be dangerous for your health. Although permanent weight loss is the goal, few are able to achieve it. Expert estimate that 95 percent of dieters return to starting weight, or even (38) _________ weight. While reckless use of fad diets can bring some initial results, long-term results are very rare. Nonetheless, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. (39) _________ being moderate, fad diets involve extreme dictary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation (40) _________ a person’s body doesn’t get all the vitamins and other things that it needs to stay healthy.Điền vào ô 40

Tiếng Anh Tốt nghiệp THPT
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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the (36) _________ of overweight people is at a new high. As people frantically search for a solution to this problem, they often try some of popular fad diet being offered. Many people see fad diet (37) ______ harmless ways of losing weight, and they are grateful to have them. Unfortunately, not only do fad diet usually fo the trick but also they can actually be dangerous for your health. Although permanent weight loss is the goal, few are able to achieve it. Expert estimate that 95 percent of dieters return to starting weight, or even (38) _________ weight. While reckless use of fad diets can bring some initial results, long-term results are very rare. Nonetheless, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. (39) _________ being moderate, fad diets involve extreme dictary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation (40) _________ a person’s body doesn’t get all the vitamins and other things that it needs to stay healthy. Điền vào ô 39

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 681 lượt xem 6 năm trước
ĐỀ 15

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 43.The hard, rigid plates that form the outermost portion of the Earth are about 100 kilometers thick. These plates include both the Earth's crust and the upper mantle. The rocks of the crust are composed mostly of minerals with light elements, like aluminum and sodium, while the mantle contains some heavier elements, like iron and magnesium. Together, the crust and upper mantle that form the surface plates are called the lithosphere. This rigid layer floats on the denser material of the lower mantle the way a wooden raft floats on a pond. The plates are supported by a weak, plastic layer of the lower mantle called the asthenosphere. Also like a raft on a pond, the lithospheric plates are carried along by slow currents in this more fluid layer beneath them.With an understanding of plate tectonics, geologists have put together a new history for the Earth's surface. About 200 million years ago, the plates at the Earth's surface formed a “supercontinent” called Pangaea. When this supercontinent started to tear apart because of plate movement, Pangaea first broke into two large continental masses with a newly formed sea that grew between the land areas as the depression filled with water. The southern one — which included the modern continents of South America, Africa, Australia, and Antarctica — is called Gondwanaland. The northern one — with North America, Europe, and Asia — is called Laurasia. North America tore away from Europe about 180 million years ago, forming the northern Atlantic Ocean. Some of the lithospheric plates carry ocean floor and others carry land masses or a combination of the two types. The movement of the lithospheric plates is responsible for earthquakes, volcanoes, and the Earth's largest mountain ranges. Current understanding of the interaction between different plates explains why these occur where they do. For example, the edge of the Pacific Ocean has been called the “Ring of Fire” because so many volcanic eruptions and earthquakes happen there. Before the 1960's, geologists could not explain why active volcanoes and strong earthquakes were concentrated in that region. The theory of plate tectonics gave them an answer.The paragraph following the passage most probably discusses

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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the (36) _________ of overweight people is at a new high. As people frantically search for a solution to this problem, they often try some of popular fad diet being offered. Many people see fad diet (37) ______ harmless ways of losing weight, and they are grateful to have them. Unfortunately, not only do fad diet usually fo the trick but also they can actually be dangerous for your health. Although permanent weight loss is the goal, few are able to achieve it. Expert estimate that 95 percent of dieters return to starting weight, or even (38) _________ weight. While reckless use of fad diets can bring some initial results, long-term results are very rare. Nonetheless, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. (39) _________ being moderate, fad diets involve extreme dictary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation (40) _________ a person’s body doesn’t get all the vitamins and other things that it needs to stay healthy.Điền vào ô 38

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Đề thi thử THPT QG 2019 Môn Vật Lý (Đề số 06)

Một mạch dao động điện từ lí tưởng có C=5μF mắc với một cuộn cảm có L=0,5mH  Đặt giữa hai bản của tụ điện một nguồn điện không đổi có suất điện động E = 3V và điện trở trong r=5Ω Khi dòng điện qua cuộn cảm ổn định thì ngắt nguồn điện khỏi mạch, để mạch thực hiện dao động. Hiệu điện thế cực đại giữa hai đầu cuộn cảm trong khi mạch dao động là

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ĐỀ THI THỬ THPT QUỐC GIA NĂM 2019 – LẦN 2 Môn thi: TIẾNG ANH (Đề 19)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Thanks to our modern lifestyle, with more and more time spent sitting down in front of computers than ever before, the (36) _________ of overweight people is at a new high. As people frantically search for a solution to this problem, they often try some of popular fad diet being offered. Many people see fad diet (37) ______ harmless ways of losing weight, and they are grateful to have them. Unfortunately, not only do fad diet usually fo the trick but also they can actually be dangerous for your health. Although permanent weight loss is the goal, few are able to achieve it. Expert estimate that 95 percent of dieters return to starting weight, or even (38) _________ weight. While reckless use of fad diets can bring some initial results, long-term results are very rare. Nonetheless, people who are fed up with the difficulties of changing their eating habits often turn to fad diets. (39) _________ being moderate, fad diets involve extreme dictary changes. They advise eating only one type of food, or they prohibit other types of foods entirely. This results in a situation (40) _________ a person’s body doesn’t get all the vitamins and other things that it needs to stay healthy.Điền vào ô 37

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Luyện tập trang 119-120

Viết công thức tính nửa góc ở đỉnh của một hình nón (góc α của tam giác vuông OAS – hình 99) sao cho diện tích mặt khai triển của mặt nón bằng một một phần tư diện tích của hình tròn (bán kính SA).Hình 99

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