单项选择题

A centrifugal pump attempting to develop flow against a closed discharge valve has a/an （）.

A.capacity of 0%
B.efficiency of 100%
C.internal slippage of 0%
D.shut off horsepower rating of 100%

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单项选择题

A.series of baffles
B.crossover pipe
C.condensate separator
D.drain pump

单项选择题

A.at the compressor discharge
B.at the compressor suction
C.in the expansion valve
D.in the receiver

单项选择题

A.Pressure-reducing valve
B.Unloading valve
C.Counterbalance valve
D.Pressure-relief valve