To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.<br>A:discharge service valve as a vapor<br>B:suction service valve as a liquid<br>C:charging valve as a liquid<br>D:condenser purge valve as a vapor

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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