单项选择题
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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单项选择题
A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.
A.high pressure liquid line
B.low pressure liquid line
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D.low pressure vapor line
