题目内容

气动元件的发展的一些趋势

A. 电气一体化
B. 小型化和轻型化
C. 高速度,高出压
D. 无油化、低功耗、高精度

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气动系统的组成是

A. 气源装置
B. 执行元件
C. 控制元件
D. 辅助元件

控制元件的功能是

A. 控制和调节压缩空气的压力
B. 控制和调节压缩空气的流量
C. 控制和调节压缩空气的方向
D. 以上都不对

I must hurry. My friend will be annoyed if __________ on time.

A. I am not
B. I be not
C. I will be not
D. I will not be

I didn't realize that Gary was in hospital. If __________ he was in hospital, I would have gone to visit him.

A. I have known
B. I had known
C. I knew
D. I know