单选题Diesel engine blow-by is the leakage of combustion gases past the （）Aoil rings onlyBcompression and scraper ringsCcylinder liner sealingsDcylinder liner ring grooves
单选题
Diesel engine blow-by is the leakage of combustion gases past the （）
A
oil rings only
B
compression and scraper rings
C
cylinder liner sealings
D
cylinder liner ring grooves
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