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【多选题】
缬氨霉素( )。A.
是一种水溶性的抗生素
B.
是一种脂溶性的抗生素
C.
嵌入质膜后可协助K+的运输
D.
嵌入质膜后可协助Na+的运输
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【简答题】一般情况下水溶液中的 EDTA 总是以 等 型体存在,其中以 与金属离子形成的配合物最稳定,但仅在 时 EDTA 才主要以此种型体存在。除个别金属离子外 , EDTA 与金属离子形成配合物时,配合比都是 。
【简答题】They will help you______you meet with difficulty. 2._________we came to the university, we have learn quite a lot. 3.I didn't join the my ester day evening__________I had to go to an important meeting...
【简答题】A: Would you like to read a or ? P: That's good. What kind of paper do you have? A: We have People's Daily, in-flight and some local . Which would you like? P: A copy of People's Daily, please. A: Her...
【单选题】“Gentlemen,” he began, “we are here this semester—your last—to continue your study of English. I know we shall enjoy learning with—and from— one another. We are going to learn something about journali...
A.
People with interest in reading and writing would lead far richer and fuller lives.
B.
People with interest in reading and writing would be likely to get a better job.
C.
It would be easy for people, with interest in reading and writing, to get out the school newspaper.
D.
People with interest in reading and writing would be more confident.
【简答题】We would try to get a car we could all travel together more easily.
【简答题】Most of us would say that the older we get, the less we look forward to celebrating another birthday. For children, though, a birthday is that one occasion each year when they are the center of attent...
【单选题】“Gentlemen,” he began, “we are here this semester—your last—to continue your study of English. I know we shall enjoy learning with—and from— one another. We are going to learn something about journali...
A.
Funny stories .
B.
History.
C.
Journalism.
D.
Literature.
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