单项选择题

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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The flywheel reduces speed fluctuations by （）

A.maintaining a constant rack setting
B.storing kinetic energy
C.maintaining equal exhaust pressure
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How often should the lubricating oil of a diesel engine be changed?（）

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