单项选择题
The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the （）.
A.compressor B.cooling coils C.condenser D.receiver
单项选择题 The compressor suction line conveys the refrigerant vapor from （） to （）.
单项选择题 Both the temperature and the pressure of the refrigerant are increased in the （）.
单项选择题 The heat used to change a liquid to a vapor is called （）.
