题目内容

根据管道中水击波传播时间与阀门关闭时间的对比关系,水击可分类为和 。

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什么是水击?减小水击压强的措施有那些?

I wouldn’t like to_______on the reasons for her resignation.

A. inspect
B. steer
C. instruct
D. speculate

Helen tried to______ the conversation away from herself.

A. sitting
B. steer
C. save
D. selling

He has an amazing _____ for hard work.

A. achieve
B. afford
C. appetite
D. acquire

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