单项选择题
A.filter B.filter drier C.heat exchanger D.air cooler
The boiling and condensation points of refrigerant main...
单项选择题The boiling and condensation points of refrigerant mainly depend on the （） exerted upon it.
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
