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问题 选择题

乙烯是重要的工业原料，下列有关乙烯叙述正确的是

A．常温常压下是气体

B．常温常压下是液体

C．不能使酸性高锰酸钾溶液褪色

D．在一定条件下能够聚合生成聚乙烯

答案

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乙烯在常温常压下是气体，能使酸性高锰酸钾溶液褪色，在一定条件下能够聚合生成聚乙烯。

单项选择题

Man: You are looking a little overwhelmed.Man: Exactly, you know. I got a million things to do, and all of them have to be finished within three hours.Question: What does the woman mean

A．She's proud of being able to do many things at the same time.

B．She is sure to finish all the things in a few hours.

C．She dreams of becoming a millionaire someday.

D．She's been kept extremely busy.
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问答题 简答题

U型压力计得主要作用是什么？
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