调冲程前重点检查部位是皮带的松紧及中尾轴螺栓是否紧固,不合适要及时调整。
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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
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