在气相色谱法中，某组分的保留时间为5min，空气的保留时间为1min_爱下问搜题

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问题单项选择题

在气相色谱法中，某组分的保留时间为5min，空气的保留时间为1min，某组分的调整保留时间为（）。

A.1min

B.2min

C.3min

D.4min

E.5min

答案

参考答案：D

选择题

My family _____________ three members.[ ]

A. is

B. has

C. have

选择题

---What did your mother say on the phone just now?

--- She asked me _____ I was getting on well with my new classmates.

A．that

B．if

C．how

D．what