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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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