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
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相关考题
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单项选择题
In （） pump a closed discharge valve will not cause excessive pressure to build up.
A.gear
B.vane
C.screw
D.centrifugal -
单项选择题
Centrifugal pumps are non-positive and a fairly （） unit.
A.low pressure
B.low discharge
C.low speed
D.high pressure -
单项选择题
Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.
A.positive displacement
B.non-positive displacement
C.mixed-flow
D.axial-flow
