單項選擇題

The flywheel reduces speed fluctuations by （）

A.maintaining a constant rack setting
B.storing kinetic energy
C.maintaining equal exhaust pressure
D.maintaining even camshaft speed

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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

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