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單項選擇題

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

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單項選擇題

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

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

單項選擇題

（）on board ship are used to control and distribute the electrical energy generated by generators.

A.Governors
B.Alternators
C.Blackboards
D.Switchboards

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