單項(xiàng)選擇題The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.

A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil


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1.單項(xiàng)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

2.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

3.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

4.單項(xiàng)選擇題The piston supporting body is mainly subjected to （） stress.

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

5.單項(xiàng)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