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單項(xiàng)選擇題

The temperature of a refrigerant gas is the highest （）.

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

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單項(xiàng)選擇題

Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）

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

單項(xiàng)選擇題

If a centrifugal bilge pump were continually operated with the discharge valve closed the （）.

A.motor overload would open
B.relief valve would open
C.pump would eventually overheat
D.motor would overheat