Under normal conditions, the main source of crankcase oil contamination is attributed to （）<br>A:metal particles loosened by wear<br>B:air when air cleaners are not used<br>C:condensation of water vapors<br>D:breakdown of the lubricating oil by dilution

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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