An increase in diesel engine crankcase pressure generally indicates excessive（）<br>A:compression pressure<br>B:lube oil header pressure<br>C:scavenge air pressure<br>D:piston ring blow-by

An increase in diesel engine crankcase pressure generally indicates excessive（）
A:compression pressure
B:lube oil header pressure
C:scavenge air pressure
D:piston ring blow-by

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