單項(xiàng)選擇題

Condensate formed within the first-effect tube nest of a double-effect,low pressure evaporator, is removed by a （）.

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

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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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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