If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.<br>A:too much refrigerant in the system<br>B:oil entrained in the refrigerant<br>C:less than a full charge of refrigerant in the system<br>D:ice crystals forming in the refrigerant

If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is （）.
A:too much refrigerant in the system
B:oil entrained in the refrigerant
C:less than a full charge of refrigerant in the system
D:ice crystals forming in the refrigerant

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