单项选择题
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
单项选择题 During working, thermostatic expansion valve should be （）.
单项选择题 When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be （）.
单项选择题 The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the （）.