To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）<br>A:suction service valve as a vapor<br>B:suction service valve as a liquid<br>C:discharge service valve as a vapor<br>D:charging valve as a liquid

To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
A:suction service valve as a vapor
B:suction service valve as a liquid
C:discharge service valve as a vapor
D:charging valve as a liquid

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