單項(xiàng)選擇題

In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）

A.lubricating oil
B.dry sump
C.circulated tank
D.wet sump

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單項(xiàng)選擇題

Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）

A.filtering
B.centrifuging
C.depositing
D.operating

單項(xiàng)選擇題

These acid residues must be prevented from entering the crankcase, otherwise the lube oil would be（）

A.contaminated
B.emulsified
C.deteriorated
D.oxidated