单选题Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）AProper refrigerant chargeBFaulty expansion valveCInsufficient refrigerantDSolenoid valve stuck open
单选题
Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）
A
Proper refrigerant charge
B
Faulty expansion valve
C
Insufficient refrigerant
D
Solenoid valve stuck open
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