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單項選擇題

Which is the pollution prevention equipment?（）

A.booster pump
B.evaporator
C.incinerator
D.cooler

單項選擇題

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