单项选择题
A.vapor B.liquid C.solid D.None of the above is tree
The saturation temperature of the refrigerant must be （...
单项选择题The saturation temperature of the refrigerant must be （） that required in the evaporator refrigerated space.
A.above B.below C.equal to D.None of the above
The function of （） in a refrigeration plant using Freon...
单项选择题The function of （） in a refrigeration plant using Freon is to move moisture from all refrigeration system.
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
