單項選擇題

In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

A.by an fuel valve
B.through an inlet valve
C.with an exhaust valve
D.from an outlet valve

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單項選擇題

In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.

A.piston crown
B.piston ring groove
C.piston skirt
D.piston ring area

單項選擇題

In the four-stroke engine, it takes （） to make one power stroke.

A.one propulsion
B.two propulsions
C.two revolutions
D.one revolution

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