单选题In a diesel engine, blow-by（）Aincrease exhaust back pressureBcauses excessive crankcase pressureCcan only be detected by a compression checkDdecreases fuel consumption
单选题
In a diesel engine, blow-by（）
A
increase exhaust back pressure
B
causes excessive crankcase pressure
C
can only be detected by a compression check
D
decreases fuel consumption
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