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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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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

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