题目内容

Which of the following pumps is used where a relatively high pressure and small capacity are required?（）

A. Volute pump
B. Diffuser pump
C. Regenerative pump
D. All of the above

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图案校正的过程（）。

活塞移动一个行程，相当于曲轴转动360度曲轴转角。

A. 正确
B. 错误

The space in No.1 lower hold is nearly full up but there is still some（）side.

A. cabin
B. cabins
C. room
D. room

简述气雾剂的特点。