单项选择题
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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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 -
单项选择题
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 -
单项选择题
In some designs the cylinder oil is timed so that the oil injects only on the （）.
A.piston crown
B.piston groove
C.piston skirt
D.piston ring belt
