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單項(xiàng)選擇題

What is the function of thermostatic expansion valve in a compression refrigeration system?（）

A.nonexistent
B.for controlling pressure
C.for controlling superheat
D.for controlling the solenoid valve

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單項(xiàng)選擇題

In a compression refrigeration plant the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the （）.

A.compressor
B.condenser
C.throttle valve
D.evaporator

單項(xiàng)選擇題

In the （） refrigeration compressor one end of the crank shaft extends through the crankcase house for connection, via a coupling or pulley, to an external drive motor.

A.open-type
B.hermetic
C.semi-hermetic
D.all the above

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