A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.<br>A:the system is fully charged<br>B:there is air leaking in from the condenser<br>C:ice crystals are forming in the refrigerant<br>D:the system contains less than a full charge of refrigerant

A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.
A:the system is fully charged
B:there is air leaking in from the condenser
C:ice crystals are forming in the refrigerant
D:the system contains less than a full charge of refrigerant

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