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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1.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

2.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

3.單項選擇題The piston supporting body is mainly subjected to （） stress.

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

4.單項選擇題The piston rings if found worn out （） and supplied by shipchandler.

A.must replace
B.must to be equipped
C.has to be repaired
D.have to be renewed

5.單項選擇題The piston rings are manufactured with a diameter （） the bore of the cylinder.

A.larger than
B.smaller than
C.equal to
D.none of the above