单项选择题
A.one-half engine speed B.the same as engine speed C.twice engine speed D.four times engine speed
In the cylinder head of a two-stroke/cycle diesel engin...
单项选择题In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）
A.air intake B.a fuel outlet C.cooling water inlets D.exhausting combustion gas
Diesel engine piston seizure can be caused by （）A.poor ...
单项选择题Diesel engine piston seizure can be caused by （）
A.poor cooling of cylinder walls B.improper cooling of the piston C.insufficient piston lubrication D.all of the above
Exhaust gases are generally removed from the cylinders ...
单项选择题Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
A.natural aspiration B.masked intake valves C.air cells D.scavenging air
