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單項選擇題

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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單項選擇題

In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）

A.wrist pin bushings
B.compression rings
C.cylinder liner seals
D.cylinder liner sealing ring

單項選擇題

A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）

A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds