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单选题
To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.
A
pump must always be primed
B
volute must impart a radial and rotary motion of the water suction side
C
connection must guide the liquid to the lantern rings
D
stuffing box should not be allowed any water leakage
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考题
单选题To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.A
pump must always be primedB
volute must impart a radial and rotary motion of the water suction sideC
connection must guide the liquid to the lantern ringsD
stuffing box should not be allowed any water leakage
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单选题Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?（）A
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Segregated ballastC
Engine room bilgesD
Cargo pump room bilges
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