题目内容

维生素C的化学结构式中含有2个手性中心,有4个异构体,临床上用其( )

A. L (+)异构体
B. L (-)异构体
C. D (-)异构体
D(+)异构体
E. 混旋体

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维生素A仅有6种异构体存在,指出其中最稳定、活性最强的异构体( )

A. 全反式
B. 3-顺式
C. 7-顺式
D. 5-顺式
E. 7,3-顺式

Match the following English expressions with proper Chinese translations. (请为下列的英文短语找到相应的中文表达。)

Match the following Chinese expressions with proper English expressions. (请为下列的中文短语找到相应的英文表达。)

Choose the proper question. (请选出正确的问句。)--______________--No, I’d rather have a glass of orange juice, please.

A. Would you like a cup of tea or some coffee?
B. Would you like rice or noodles?
C. What would you like to drink?
D. What would you like to eat?

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