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單項(xiàng)選擇題

（） is the breakdown of surface tension between oil droplets in an oil water mixture which causes them to join and increase in size.

A.Wear
B.Contaminating
C.Coalescence
D.Coarse separating

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單項(xiàng)選擇題

Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge.

A.non-pulsating
B.pulsating
C.positive
D.non-positive

單項(xiàng)選擇題

The emergency bilge suction or bilge （） is used to prevent flooding of the ship.

A.injection valve
B.relief valve
C.discharge valve
D.inlet filter

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