单选题Under normal conditions, the main source of crankcase oil contamination is attributed to （）Ametal particles loosened by wearBair when air cleaners are not usedCcondensation of water vaporsDbreakdown of the lubricating oil by dilution
单选题
Under normal conditions, the main source of crankcase oil contamination is attributed to （）
A
metal particles loosened by wear
B
air when air cleaners are not used
C
condensation of water vapors
D
breakdown of the lubricating oil by dilution
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