题目内容

A pump is defined as device that()

A. produces pressure
B. imparts energy to a fluid to move it from level ‘A’ to level ‘B’
C. creates a vacuum to move a liquid in all installation
D. is to develop a pressure differential

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自动主汽门靠油压开启,而以弹簧力关闭。()

A. 正确
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C. 娘娘顶
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