单项选择题
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
单项选择题 In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）
单项选择题 A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）
单项选择题 Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
