單項(xiàng)選擇題

The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it.

A.temperature
B.density
C.volume
D.pressure

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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

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