单选题The function of lubricating oil is to （）.Areduce friction between moving surfacesBprovide even distribution of bearing wearCreduce the accumulation of harmful detergentsDmaintain a constant oil temperature output at each beating
单选题
The function of lubricating oil is to （）.
A
reduce friction between moving surfaces
B
provide even distribution of bearing wear
C
reduce the accumulation of harmful detergents
D
maintain a constant oil temperature output at each beating
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