题目内容

液压冲击产生的原因有以下哪几项?

A. 突然换向
B. 阀门突然关闭
C. 溢流阀失灵

查看答案
更多问题

空穴现象常出现在什么地方

A. 阀口
B. 液压缸
C. 泵的入口
D. 节流阀

I did not like the house at the beginning but the new furniture ________ all the difference.

A. took
B. made
C. did
D. had

I stopped smoking for the ________ of health.

A. sake
B. reason
C. cause
D. purpose

You should make ________ your bed before you leave for school.

A. off
B. out
C. up
D. on

答案查题题库