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单选题
If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.
A
the circuit breaker
B
for leaks in the suction piping
C
relief valve is not properly seated
D
the suction strainer
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考题
单选题If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for all of the following EXCEPT （）.A
the circuit breakerB
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relief valve is not properly seatedD
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考题
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单选题If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）A
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centrifugal pump makes maintenance easier than reciprocating pump doesD
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