If you keep still, you may sit ____ this_爱下问搜题

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问题选择题

If you keep still, you may sit ____ this end of the boat ____ the other. [ ]

A. both; and

B. either; or

C. neither; nor

D. not; but

答案

答案：B

选择题

If you _____ a mistake in reviewing the report, please bring it to my attention.[ ]

A. come along

B. come across

C. come around to

D. come about

多项选择题

按分子所带电荷进行分离的方法主要有（）

A、离子交换层析法

B、电泳法

C、等电聚焦

D、亲和层析