单选题The most common cause of lowering the crankcase lube oil flash point is （）.Amore water contentsBcontamination with fuel oilChigher temperatureDsufficient cooling of oil mist
单选题
The most common cause of lowering the crankcase lube oil flash point is （）.
A
more water contents
B
contamination with fuel oil
C
higher temperature
D
sufficient cooling of oil mist
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