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單項(xiàng)選擇題

The over-speed trip device installed in some diesel engines is automatically actuated by（）

A.spring force
B.hydraulic pressure
C.centrifugal force
D.mechanical linkage

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單項(xiàng)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

單項(xiàng)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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