Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.<br>A:wax precipitation in the lube oil<br>B:contamination by dust, scale, or moisture<br>C:refrigerant bubbles in the lube oil<br>D:refrigerant reducing the lube oil viscosity

Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.
A:wax precipitation in the lube oil
B:contamination by dust, scale, or moisture
C:refrigerant bubbles in the lube oil
D:refrigerant reducing the lube oil viscosity

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