单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the ().Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor

单选题
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


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