单选题A warmer than normal compressor suction line might be caused by （）.Ainsufficient lubricationBinsufficient refrigerantCexcess refrigerantDexcessive opening of the expansion valve
单选题
A warmer than normal compressor suction line might be caused by （）.
A
insufficient lubrication
B
insufficient refrigerant
C
excess refrigerant
D
excessive opening of the expansion valve
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