单项选择题
A.temperature B.density C.volume D.pressure
In a compression refrigeration plant the refrigerant is...
单项选择题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
A feeler or thermal bulb is used for the expansion valv...
单项选择题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
The expansion valve on a Freon system controls the （）.A...
单项选择题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
