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單項(xiàng)選擇題

The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.

A.crankshaft
B.camshaft
C.piston rod
D.rack and pinion

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單項(xiàng)選擇題

The pistons are cooled by oil supplied from the forced （） system.

A.fresh water
B.sea water
C.lubrication
D.fuel oil

單項(xiàng)選擇題

The piston supporting body is mainly subjected to （） stress.

A.pushing
B.centrifugal
C.stretch
D.compressive

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