单项选择题
Sealing in pump shaft is achieved by means of the ().
A.gasket
B.packing
C.washer
D.spring
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相关考题
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单项选择题
() 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 -
单项选择题
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 -
单项选择题
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
