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單項選擇題

（） are commonly used in mechanical-hydraulic governor（調(diào)速器） to sense engine speeds.

A.Bulbs
B.Bulks
C.Flyweights
D.Flywheels

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單項選擇題

A （）is the foundation of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.

A．Frame
B．Bedplate
C．Cylinder
D．Liner

單項選擇題

“Stand by an engine” means （）

A.“prepare to stop the engine”
B. “assemble an engine on its bedplate”
C. “make an engine ready for starting”
D. “dismantle an engine”

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