单选题To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the （）.Apump must always be primedBvolute must impart a radial and rotary motion of the water suction sideCconnection must guide the liquid to the lantern ringsDstuffing box should not be allowed any water leakage
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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