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單項選擇題

（） are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end bearing.

A.Doors
B.Aspirate gauzer
C.Coupling
D.Blind

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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

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

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