生物碱的薄层色谱和纸色谱法常用的显色剂是 A．碘化汞钾 B．_爱下问搜题

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问题单项选择题

生物碱的薄层色谱和纸色谱法常用的显色剂是

A．碘化汞钾
B．改良碘化铋钾
C．硅钨酸
D．雷氏铵盐
E．碘-碘化钾

答案

参考答案：B

选择题

This is ________ family.[ ]

A. my

B. me

C. he

D. I

补全对话，情景问答

给下列的问句选择合适的答语。

( ) 1. What do you like?
( ) 2. What would you like for breakfast?
( ) 3. What do you have for lunch?

A. I have fish and tofu.
B. I'd like beef and green beans.
C. I like mutton and carrots.