单项选择题
If the compressor-discharge temperature is higher than the receiver temperature（）
A.increase the amount of cooling water to the condenser B.decrease the amount of cooling water to the condenser C.add more refrigerant to the system D.remove some of the refrigerant from the system
单项选择题 If the head pressure is too high,（）
单项选择题 If no gaskets are used in the piping joints of a Freon system, the joints must be（）
单项选择题 If the temperature in the icebox is too high, the trouble could be（）
