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單項選擇題

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

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單項選擇題

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

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

單項選擇題

The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.

A.behind
B.far from
C.adjacent to
D.in front of

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