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【简答题】
购买某种饮料x听,所需钱数为y元,若每听2 元,试分别用解析法、列表法将y表示成x 的函数,并指出函数的值域
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参考答案：
举一反三
【单选题】在用反相HPLC法分离测定B族维生素时,常加入己烷磺酸钠,其目的是
A.
调节溶液的pH，使样品充分游离
B.
与B族维生素反应，生成离子对，易于被色谱柱保留
C.
防止样品被氧化
D.
络合样品中微量的金属离子
E.
提高分离度
查看完整题目与答案
【单选题】已知αAB=30°,则αBA=【】。
A.
30°
B.
150°
C.
210°
D.
330°
查看完整题目与答案
【单选题】在用反相HPLC法分离测定B族维生素时，常加入己烷磺酸钠，其目的是（）
A.
调节溶液PH，使样品充分游离
B.
与B族维生素反应，生成离子对，易于被色谱柱保留
C.
防止样品被氧化
D.
络合样品中的为量的金属离子
E.
提高分离度
查看完整题目与答案
【单选题】听力原文： In a statement, President Bush says he is taking the action, because the conflict in Darfur threatens the national security and foreign policy of the United States. The asset freeze is being imp...
A.
The asset freeze is being imposed on four Sudanese.
B.
The conflict in Darfur threatens the national security and foreign policy of the United States.
C.
Rallies axe planned in Washington and throughout the US to protest the four-year war in Darfur.
D.
George Clooney just returned from a trip to the Darfur region.
查看完整题目与答案
【单选题】在用反相HPLC法分离测定B族维生素时常加入己磺酸钠,其目的是
A.
调节溶液的PH值，使样品充分游离
B.
与样品离子反应生成离子对，改善色谱行为
C.
防止样品被氧化
D.
络合样品中微量的金属离子
E.
抑制B族维生素电离
查看完整题目与答案
【判断题】[判断题AB]K线为阳线时,下影线的长度则代表开盘价和最低价之间的差距。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】The author would most likely agree with which of the following descriptions of the conflict between Darwinists and cultural anthropologists over the nature of animal emotions?
A.
The concept of animal emotions suggests that human emotions are based on instinctual biology.
B.
Cultural relativists dispute the notion that animal emotions are innate and not be learned.
C.
Darwinists view the events of the twentieth-century as a triumph of animal instinct over rational human behavior.
D.
Darwinists wish to draw a line between emotional behavior. and culturally acquired behavior.
E.
Cultural relativists support the idea of an animal behavior. dictated by behavioral rules.
查看完整题目与答案
【单选题】Jack Kerouac was neither a demon nor a saint but a ______ , notably gentle, deeply conflicted and finally self-destructive person whose dream from childhood was to be a writer.
A.
muse
B.
martyr
C.
cadge
D.
fallible
E.
ascetic
查看完整题目与答案
【单选题】This offer _______________ an Sept. 30. Your immediate reply by cable will be appreciated.
A.
extends
B.
expires
C.
includes
D.
stops
查看完整题目与答案
【简答题】MDY({^1999-12-30})，显示结果为______。
查看完整题目与答案
相关题目：
【单选题】在用反相HPLC法分离测定B族维生素时,常加入己烷磺酸钠,其目的是
A.
调节溶液的pH，使样品充分游离
B.
与B族维生素反应，生成离子对，易于被色谱柱保留
C.
防止样品被氧化
D.
络合样品中微量的金属离子
E.
提高分离度
查看完整题目与答案
【单选题】已知αAB=30°,则αBA=【】。
A.
30°
B.
150°
C.
210°
D.
330°
查看完整题目与答案
【单选题】在用反相HPLC法分离测定B族维生素时，常加入己烷磺酸钠，其目的是（）
A.
调节溶液PH，使样品充分游离
B.
与B族维生素反应，生成离子对，易于被色谱柱保留
C.
防止样品被氧化
D.
络合样品中的为量的金属离子
E.
提高分离度
查看完整题目与答案
【单选题】听力原文： In a statement, President Bush says he is taking the action, because the conflict in Darfur threatens the national security and foreign policy of the United States. The asset freeze is being imp...
A.
The asset freeze is being imposed on four Sudanese.
B.
The conflict in Darfur threatens the national security and foreign policy of the United States.
C.
Rallies axe planned in Washington and throughout the US to protest the four-year war in Darfur.
D.
George Clooney just returned from a trip to the Darfur region.
查看完整题目与答案
【单选题】在用反相HPLC法分离测定B族维生素时常加入己磺酸钠,其目的是
A.
调节溶液的PH值，使样品充分游离
B.
与样品离子反应生成离子对，改善色谱行为
C.
防止样品被氧化
D.
络合样品中微量的金属离子
E.
抑制B族维生素电离
查看完整题目与答案
【判断题】[判断题AB]K线为阳线时,下影线的长度则代表开盘价和最低价之间的差距。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】The author would most likely agree with which of the following descriptions of the conflict between Darwinists and cultural anthropologists over the nature of animal emotions?
A.
The concept of animal emotions suggests that human emotions are based on instinctual biology.
B.
Cultural relativists dispute the notion that animal emotions are innate and not be learned.
C.
Darwinists view the events of the twentieth-century as a triumph of animal instinct over rational human behavior.
D.
Darwinists wish to draw a line between emotional behavior. and culturally acquired behavior.
E.
Cultural relativists support the idea of an animal behavior. dictated by behavioral rules.
查看完整题目与答案
【单选题】Jack Kerouac was neither a demon nor a saint but a ______ , notably gentle, deeply conflicted and finally self-destructive person whose dream from childhood was to be a writer.
A.
muse
B.
martyr
C.
cadge
D.
fallible
E.
ascetic
查看完整题目与答案
【单选题】This offer _______________ an Sept. 30. Your immediate reply by cable will be appreciated.
A.
extends
B.
expires
C.
includes
D.
stops
查看完整题目与答案
【简答题】MDY({^1999-12-30})，显示结果为______。
查看完整题目与答案
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