單項(xiàng)選擇題

In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.

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

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單項(xiàng)選擇題

A feeler or thermal bulb is used for the expansion valve to （）.

A.detect the temperature
B.detect the pressure
C.heat the refrigerant
D.accelerate the refrigerant

單項(xiàng)選擇題

The expansion valve on a Freon system controls the （）.

A.superheat of the gas leaving the compressor
B.back pressure in the evaporator
C.temperature of the icebox
D.superheat of the gas leaving the evaporator