单选题What function is provided by the crankcase ventilation system on some diesel engines?（）AIncreases the sludge forming tendency of lube oilBPrevents the accumulation of combustible gasesCImproves lube oil coolingDImproves cold weather starting
单选题
What function is provided by the crankcase ventilation system on some diesel engines?（）
A
Increases the sludge forming tendency of lube oil
B
Prevents the accumulation of combustible gases
C
Improves lube oil cooling
D
Improves cold weather starting
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