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

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

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

單項(xiàng)選擇題

The heavy-duty lubricating oil with chemical has been widely introduced in recent years（）

A.additives
B.behavior
C.coolant
D.desiccant

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