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

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

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“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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