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單項(xiàng)選擇題

The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.

A.the pump cylinder
B.the pump cam
C.the pump plunger
D.the pump miler

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單項(xiàng)選擇題

The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.

A.wheel
B.crankshaft
C.running gear
D.cam

單項(xiàng)選擇題

The process to remove exhaust gases by blowing in fresh air is called （）.

A.charging
B.supercharging
C.starting
D.scavenging

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