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單項選擇題

The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.

A.pinion arrangement
B.push rod
C.handle bar
D.cam device

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單項選擇題

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

單項選擇題

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

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