单项选择题
A.piston crown B.piston ring groove C.piston skirt D.piston ring area
In the four-stroke engine, it takes （） to make one powe...
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
In the event of the cylinder starting valve leakage （） ...
单项选择题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
In the （） pressure charging system the pulse of energy ...
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
