单项选择题
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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相关考题
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单项选择题
These acid residues must be prevented from entering the crankcase, otherwise the lube oil would be（）
A.contaminated
B.emulsified
C.deteriorated
D.oxidated -
单项选择题
（）on board ship are used to control and distribute the electrical energy generated by generators.
A.Governors
B.Alternators
C.Blackboards
D.Switchboards -
单项选择题
The heavy-duty lubricating oil with chemical has been widely introduced in recent years（）
A.additives
B.behavior
C.coolant
D.desiccant
