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單項(xiàng)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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單項(xiàng)選擇題

In the event of the cylinder starting valve leakage （） would pass into the air pipes and ignite the oil deposited.

A.cooling water
B.vapor from the boiler
C.starting air
D.hot gases

單項(xiàng)選擇題

In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.

A.constant
B.pulse
C.high
D.none of the above

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