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问题 单项选择题

用HPLG法测得某药保留时间为12.54分钟，半高峰宽3.0mm(低速5mm/min)，计算柱效为

A．116

B．484

C．2 408

D．2 904

E．2 420

答案

参考答案：E

选择题

— I left my handbag on thetrain, but Iuckily someone gave it to a railway official.  

— How unbelievable to get it back! I mean, someone _____ it.    [ ]

A. will have stolen          

B. might have stolen      

C. should have stolen        

D. must have stolen
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选择题

In that mountain village in winter clothes ___near a fire after they have been washed.

A．usually hanged up

B．are usually hanged up

C．usually hung up

D．are usually hung up
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