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单项选择题
To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the .
To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the .
A.discharge service valve as a vapor
B.suction service valve as a liquid
C.charging valve as a liquid
D.condenser purge valve as a vapor
A.
A.discharge
B.suction
C.charging
D.condenser
A.discharge
B.suction
C.charging
D.condenser
