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單項選擇題

How often should the lubricating oil of a diesel engine be changed?（）

A.After every trip
B.Every 4000 hours
C.According to manufacturer’s instructions
D.Every time they are shutdown

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單項選擇題

The main function of piston compression rings is to （）

A.prevent excessive cylinder liner wear
B.reduce friction losses in the engine
C.seal the space between the piston and the liner
D.limit upward flow of lube oil into the combustion space

單項選擇題

Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）

A.a combination of constant volume and constant pressure
B.a combination of constant temperature and constant pressure
C.entirely constant pressure
D.entirely constant volume