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Bài tập thủy phân chất béo P.1

Xà phòng hóa hoàn toàn m gam chất béo trung tính bằng dung dịch KOH thu được 18,77 gam muối. Nếu thay dung dịch KOH bằng dung dịch NaOH chỉ thu được 17,81 gam muối. Giá trị của m là

Hóa học Lớp 12

Xem chi tiết 6.9 K lượt xem 6 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 42 After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue. There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, "Is an MBA degree really what I need to be best prepared for getting a good job?" The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. According to the passage, what are two causes of declining business school enrollments?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 379 lượt xem 6 năm trước

Bài 4: Các tập hợp số

Xác định tập hợp sau và biểu diễn chúng trên trục số: (2; 3) ∩ [3; 5)

Toán Lớp 10

Xem chi tiết 8.2 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 42 After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue. There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, "Is an MBA degree really what I need to be best prepared for getting a good job?" The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. As used in paragraph 2, the word "seeking" could best be replaced by which of the following?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 494 lượt xem 6 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 42 After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue. There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, "Is an MBA degree really what I need to be best prepared for getting a good job?" The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. Which of the following business schools has NOT shown a decrease in enrollment?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 553 lượt xem 6 năm trước

Bài 4: Các tập hợp số

Xác định tập hợp sau và biểu diễn chúng trên trục số: (4; 7) ∩ (-7; -4)

Toán Lớp 10

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 42 After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue. There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, "Is an MBA degree really what I need to be best prepared for getting a good job?" The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. The word "prosperity" in line 1 could be best replaced by which of the following?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 547 lượt xem 6 năm trước

Bài 4: Các tập hợp số

Xác định tập hợp sau và biểu diễn chúng trên trục số: (-12; 3] ∩ [-1; 4]

Toán Lớp 10

Xem chi tiết 5.8 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 42 After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue. There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, "Is an MBA degree really what I need to be best prepared for getting a good job?" The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. The phrase "two decades" in line 1 refers to a period of _________ .

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 675 lượt xem 6 năm trước

Bài 4: Các tập hợp số

Xác định tập hợp sau và biểu diễn chúng trên trục số: (-2; 15) ∪ (3; +∞)

Toán Lớp 10

Xem chi tiết 2.6 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 42 After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75,000, and the trend of lower enrollment rates is expected to continue. There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question, "Is an MBA degree really what I need to be best prepared for getting a good job?" The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. What is the main focus of this passage?

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 4 K lượt xem 6 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 34. At the beginning of the nineteenth century, the American educational system was desperately in need of reform. Private schools existed, but only for the very rich. There were very few public schools because of the strong sentiment that children who would grow up to be laborers should not “waste” their time on education but should instead prepare themselves for their life’s work. It was in the face of this public sentiment that educational reformers set about their task. Horace Mann, probably the most famous of the reformers, felt that there was no excuse in a republic for any citizen to be uneducated. As Manager of Education in the state of Massachusetts from 1837 to 1848, he initiated various changes, which were soon matched in other school districts around the country. He extended the school year from five to six months and improved the quality of teachers by instituting teacher education and raising teacher salaries. Although these changes did not bring about a sudden improvement in the educational system, they at least increased public awareness as to the need for a further strengthening of the system. The word “desperately” in the passage mostly means _________.

Tiếng Anh Tốt nghiệp THPT

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 28

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 474 lượt xem 6 năm trước

Bài 4: Các tập hợp số

Xác định tập hợp sau và biểu diễn chúng trên trục số: (0; 2] ∪ [-1; 1)

Toán Lớp 10

Xem chi tiết 5.7 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 34. At the beginning of the nineteenth century, the American educational system was desperately in need of reform. Private schools existed, but only for the very rich. There were very few public schools because of the strong sentiment that children who would grow up to be laborers should not “waste” their time on education but should instead prepare themselves for their life’s work. It was in the face of this public sentiment that educational reformers set about their task. Horace Mann, probably the most famous of the reformers, felt that there was no excuse in a republic for any citizen to be uneducated. As Manager of Education in the state of Massachusetts from 1837 to 1848, he initiated various changes, which were soon matched in other school districts around the country. He extended the school year from five to six months and improved the quality of teachers by instituting teacher education and raising teacher salaries. Although these changes did not bring about a sudden improvement in the educational system, they at least increased public awareness as to the need for a further strengthening of the system. The word “salaries” is closest in meaning to _________.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 531 lượt xem 6 năm trước

30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 27

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 316 lượt xem 6 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 34. At the beginning of the nineteenth century, the American educational system was desperately in need of reform. Private schools existed, but only for the very rich. There were very few public schools because of the strong sentiment that children who would grow up to be laborers should not “waste” their time on education but should instead prepare themselves for their life’s work. It was in the face of this public sentiment that educational reformers set about their task. Horace Mann, probably the most famous of the reformers, felt that there was no excuse in a republic for any citizen to be uneducated. As Manager of Education in the state of Massachusetts from 1837 to 1848, he initiated various changes, which were soon matched in other school districts around the country. He extended the school year from five to six months and improved the quality of teachers by instituting teacher education and raising teacher salaries. Although these changes did not bring about a sudden improvement in the educational system, they at least increased public awareness as to the need for a further strengthening of the system. From 1837 to 1848, Horace Mann _________.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1.8 K lượt xem 6 năm trước

Bài 4: Các tập hợp số

Xác định tập hợp sau và biểu diễn chúng trên trục số: [-3; 1) ∪ (0; 4]

Toán Lớp 10

Xem chi tiết 8.3 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 34. At the beginning of the nineteenth century, the American educational system was desperately in need of reform. Private schools existed, but only for the very rich. There were very few public schools because of the strong sentiment that children who would grow up to be laborers should not “waste” their time on education but should instead prepare themselves for their life’s work. It was in the face of this public sentiment that educational reformers set about their task. Horace Mann, probably the most famous of the reformers, felt that there was no excuse in a republic for any citizen to be uneducated. As Manager of Education in the state of Massachusetts from 1837 to 1848, he initiated various changes, which were soon matched in other school districts around the country. He extended the school year from five to six months and improved the quality of teachers by instituting teacher education and raising teacher salaries. Although these changes did not bring about a sudden improvement in the educational system, they at least increased public awareness as to the need for a further strengthening of the system. The word “reformers” in the passage mostly means _________.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 1 K lượt xem 6 năm trước

30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 26

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 539 lượt xem 6 năm trước

Bài 4: Các tập hợp số

Vẽ biểu đồ minh họa quan hệ bao hàm của các tập hợp số đã học.

Toán Lớp 10

Xem chi tiết 5.1 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 34. At the beginning of the nineteenth century, the American educational system was desperately in need of reform. Private schools existed, but only for the very rich. There were very few public schools because of the strong sentiment that children who would grow up to be laborers should not “waste” their time on education but should instead prepare themselves for their life’s work. It was in the face of this public sentiment that educational reformers set about their task. Horace Mann, probably the most famous of the reformers, felt that there was no excuse in a republic for any citizen to be uneducated. As Manager of Education in the state of Massachusetts from 1837 to 1848, he initiated various changes, which were soon matched in other school districts around the country. He extended the school year from five to six months and improved the quality of teachers by instituting teacher education and raising teacher salaries. Although these changes did not bring about a sudden improvement in the educational system, they at least increased public awareness as to the need for a further strengthening of the system. According to the passage, Horace Mami wanted a better educational system for Americans because _________.

Tiếng Anh Tốt nghiệp THPT

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85 Bài tập Biện luận tìm công thức muối AMONI hữu cơ cực hay có lời giải chi tiết (Phần 2)

Cho hỗn hợp X gồm 2 chất hữu cơ có cùng công thức phân tử C3H10N2O2 tác dụng vừa đủ với dung dịch NaOH và đun nóng, thu được dung dịch Y và 4,48 lít hỗn hợp Z (ở đktc) gồm hai khí (đều làm xanh giấy quỳ ẩm) hơn kém nhau một nguyên tử C. Tỉ khối hơi của Z đối với H2 bằng 13,75. Cô cạn dung dịch Y thu được khối lượng muối khan là:

Hóa học Lớp 11

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 25

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 338 lượt xem 6 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 34. At the beginning of the nineteenth century, the American educational system was desperately in need of reform. Private schools existed, but only for the very rich. There were very few public schools because of the strong sentiment that children who would grow up to be laborers should not “waste” their time on education but should instead prepare themselves for their life’s work. It was in the face of this public sentiment that educational reformers set about their task. Horace Mann, probably the most famous of the reformers, felt that there was no excuse in a republic for any citizen to be uneducated. As Manager of Education in the state of Massachusetts from 1837 to 1848, he initiated various changes, which were soon matched in other school districts around the country. He extended the school year from five to six months and improved the quality of teachers by instituting teacher education and raising teacher salaries. Although these changes did not bring about a sudden improvement in the educational system, they at least increased public awareness as to the need for a further strengthening of the system. The passage implied that to go to a private school, a student needed _______.

Tiếng Anh Tốt nghiệp THPT

Xem chi tiết 2.2 K lượt xem 6 năm trước

30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 24

Tiếng Anh Tốt nghiệp THPT

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Bài 3: Các phép toán tập hợp

Cho tập hợp A, hãy xác định A ∩ A, A ∪ A, A ∩ ∅, A ∪ ∅, CAA, CA∅

Toán Lớp 10

Xem chi tiết 20.6 K lượt xem 1 năm trước

25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 from 25 to 29. Fill in the appropriate word in question 29 The warming of the Pacific Ocean has created weather pattern (25)___ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (26)_ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (27)_ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (28)_ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (29)_____ on the global scale either.

Tiếng Anh Tốt nghiệp THPT

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 23

Tiếng Anh Tốt nghiệp THPT

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Bài 3: Các phép toán tập hợp

Trong số 45 học sinh của lớp 10A có 15 bạn được xếp loại học lực giỏi, 20 bạn được xếp loại hạnh kiểm tốt, trong đó có 10 bạn vừa học lực giỏi, vừa có hạnh kiểm tốt. Hỏi a) Lớp 10A có bao nhiêu bạn được khen thưởng, biết rằng muốn được khen thưởng bạn đó phải học lực giỏi hoặc có hạnh kiểm tốt? b) Lớp 10A có bao nhiêu bạn chưa được xếp loại học lực giỏi và chưa có hạnh kiểm tốt?

Toán Lớp 10

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 from 25 to 29. Fill in the appropriate word in question 28 The warming of the Pacific Ocean has created weather pattern (25)___ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (26)_ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (27)_ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (28)_ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (29)_____ on the global scale either.

Tiếng Anh Tốt nghiệp THPT

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 22

Tiếng Anh Tốt nghiệp THPT

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Bài 3: Các phép toán tập hợp

Vẽ lại và gạch chéo các tập hợp A ∩ B , A ∪ B, A \ B (h.9) trong các trường hợp sau:

Toán Lớp 10

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 from 25 to 29. Fill in the appropriate word in question 27 The warming of the Pacific Ocean has created weather pattern (25)___ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (26)_ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (27)_ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (28)_ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (29)_____ on the global scale either.

Tiếng Anh Tốt nghiệp THPT

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 from 25 to 29. Fill in the appropriate word in question 26 The warming of the Pacific Ocean has created weather pattern (25)___ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (26)_ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (27)_ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (28)_ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (29)_____ on the global scale either.

Tiếng Anh Tốt nghiệp THPT

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 21

Tiếng Anh Tốt nghiệp THPT

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Bài tập thủy phân chất béo P.1

Thủy phân hoàn toàn m gam triglixerit X trong dung dịch NaOH, thu được sản phẩm gồm glixerol, 15,2 gam natri oleat và 30,6 gam natri stearat. Phân tử khối của X là

Hóa học Lớp 12

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Bài 3: Các phép toán tập hợp

Kí hiệu A là tập hợp các chữ cái trong câu "CÓ CHÍ THÌ NÊN", B là tập hợp các chữ cái trong câu "CÓ CÔNG MÀI SẮT CÓ NGÀY NÊN KIM". Hãy xác định A ∩ B, A ∪ B, A \ B và B \ A.

Toán Lớp 10

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 20

Tiếng Anh Tốt nghiệp THPT

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

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 from 25 to 29. Fill in the appropriate word in question 25 The warming of the Pacific Ocean has created weather pattern (25)___ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (26)_ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (27)_ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (28)_ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (29)_____ on the global scale either.

Tiếng Anh Tốt nghiệp THPT

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Bài 3: Các phép toán tập hợp

Giả sử tập hợp A các học sinh giỏi của lớp 10E là A = { An, Minh, Bảo, Cường, Vinh, Hoa, Lan, Tuệ, Quý}. Tập hợp B các học sinh của tổ 1 lớp 10E là B = { An, Hùng, Tuấn, Vinh, Lê, Tâm, Tuệ, Quý}. Xác định tập hợp C các học sinh giỏi của lớp 10E không thuộc tổ 1.

Toán Lớp 10

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Bài 3: Các phép toán tập hợp

Giả sử A, B lần lượt là tập hợp các học sinh giỏi Toán, giỏi Văn của lớp 10E. Biết A = { Minh, Nam, Lan, Hồng, Nguyệt }; B = { Cường, Lan, Dũng, Hồng, Tuyết, Lê }; (Các học sinh trong lớp không trùng tên nhau) Gọi C là tập hợp đội tuyển thi học sinh giỏi của lớp gồm các bạn giỏi Toán hoặc giỏi Văn. Hãy xác định tập hợp C.

Toán Lớp 10

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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 19)

Read the following passage, and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 19 to 28. Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes _19_ ecosystems. If there is too _20_ rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals that _21_ it may also die or move away. Some changes are good for ecosystems. Some pine forests need _22_ for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds_23_. Polluting the air, soil, and water can harm ecosystems. Building _24_ on rivers for electric power and irr igation can harm ecosystems _25_ the rivers. Bulldozing wetlands and cutting down _26_ destroy ecosystems. Ecologists are working with companies and governments to find better ways of _27_ fish, cutting down trees, and building dams. T hey are looking for ways to get food, lumber, and other products for people _28_ causing harm to ecosystems. Điền vào số 19

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Bài 3: Các phép toán tập hợp

Cho A = { n ∈ N | n là ước của 12} B = { n ∈ N | n là ước của 18} Liệt kê các phần tử của tập hợp C các ước chung của 12 và 18

Toán Lớp 10

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Bài tập thủy phân chất béo P.1

Sục khí H2 dư vào bình chứa triolein (xúc tác Ni, to), có 0,06 mol H2 phản ứng, thu được chất béo X. Xà phòng hóa toàn bộ X trong dung dịch NaOH dư, thu được m gam muối. Biết các phản ứng xảy ra hoàn toàn. Giá trị của m là

Hóa học Lớp 12

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. In water polo the ball can be _________ by passing with one hand.

Tiếng Anh Tốt nghiệp THPT

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Bài 3: Các phép toán tập hợp

Cho A = { n ∈ N | n là ước của 12} B = { n ∈ N | n là ước của 18} Liệt kê các phần tử của A và của B

Toán Lớp 10

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Rowing is the sport or activity of travelling in a boat by using _________.

Tiếng Anh Tốt nghiệp THPT

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Bài tập thủy phân chất béo P.1

Hiđro hóa hoàn toàn m gam triolein (xúc tác Ni, to) cần vừa đủ V lít khí H2 (đktc), thu được chất béo T. Xà phòng hóa toàn bộ T trong dung dịch KOH dư, thu được 2,76 gam glixerol. Biết các phản ứng xảy ra hoàn toàn. Giá trị của V là

Hóa học Lớp 12

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25 BỘ ĐỀ THI THỬ THPT QUỐC GIA - MÔN TIẾNG ANH (ĐỀ SỐ 23)

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. After a decade of economic liberalization, Vietnam has seen a dramatic rise in living _________ in urban areas.

Tiếng Anh Tốt nghiệp THPT

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Lớp 12

Lớp 11

Lớp 10

Ôn vào 10

Lớp 9

Lớp 8

Lớp 7

Lớp 6

Ôn vào 6

Lớp 5

Lớp 4

Lớp 3

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Danh sách câu hỏi ( Có 2,493,527 câu hỏi trên 49,871 trang )

Xà phòng hóa hoàn toàn m gam chất béo trung tính bằng dung dịch KOH thu được 18,77 gam muối. Nếu thay dung dịch KOH bằng dung dịch NaOH chỉ thu được 17,81 gam muối. Giá trị của m là

Xác định tập hợp sau và biểu diễn chúng trên trục số: (2; 3) ∩ [3; 5)

Xác định tập hợp sau và biểu diễn chúng trên trục số: (4; 7) ∩ (-7; -4)

Xác định tập hợp sau và biểu diễn chúng trên trục số: (-12; 3] ∩ [-1; 4]

Xác định tập hợp sau và biểu diễn chúng trên trục số: (-2; 15) ∪ (3; +∞)

Xác định tập hợp sau và biểu diễn chúng trên trục số: (0; 2] ∪ [-1; 1)

Xác định tập hợp sau và biểu diễn chúng trên trục số: [-3; 1) ∪ (0; 4]

Vẽ biểu đồ minh họa quan hệ bao hàm của các tập hợp số đã học.

Cho tập hợp A, hãy xác định A ∩ A, A ∪ A, A ∩ ∅, A ∪ ∅, CAA, CA∅

Vẽ lại và gạch chéo các tập hợp A ∩ B , A ∪ B, A \ B (h.9) trong các trường hợp sau:

Thủy phân hoàn toàn m gam triglixerit X trong dung dịch NaOH, thu được sản phẩm gồm glixerol, 15,2 gam natri oleat và 30,6 gam natri stearat. Phân tử khối của X là

Kí hiệu A là tập hợp các chữ cái trong câu "CÓ CHÍ THÌ NÊN", B là tập hợp các chữ cái trong câu "CÓ CÔNG MÀI SẮT CÓ NGÀY NÊN KIM". Hãy xác định A ∩ B, A ∪ B, A \ B và B \ A.

Cho A = { n ∈ N | n là ước của 12} B = { n ∈ N | n là ước của 18} Liệt kê các phần tử của tập hợp C các ước chung của 12 và 18

Sục khí H2 dư vào bình chứa triolein (xúc tác Ni, to), có 0,06 mol H2 phản ứng, thu được chất béo X. Xà phòng hóa toàn bộ X trong dung dịch NaOH dư, thu được m gam muối. Biết các phản ứng xảy ra hoàn toàn. Giá trị của m là

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. In water polo the ball can be _________ by passing with one hand.

Cho A = { n ∈ N | n là ước của 12} B = { n ∈ N | n là ước của 18} Liệt kê các phần tử của A và của B

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Rowing is the sport or activity of travelling in a boat by using _________.

Hiđro hóa hoàn toàn m gam triolein (xúc tác Ni, to) cần vừa đủ V lít khí H2 (đktc), thu được chất béo T. Xà phòng hóa toàn bộ T trong dung dịch KOH dư, thu được 2,76 gam glixerol. Biết các phản ứng xảy ra hoàn toàn. Giá trị của V là

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. After a decade of economic liberalization, Vietnam has seen a dramatic rise in living _________ in urban areas.

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