单项选择题
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
Improperly fitted piston rings in a diesel engine can c...
单项选择题Improperly fitted piston rings in a diesel engine can cause（）
A.excessive lube oil consumption B.lower than normal lube oil temperature C.higher than normal exhaust back pressure D.excessive crankshaft end play
Cold clearances between the skirt of an aluminum piston...
单项选择题Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）
A.twice as large as with a cast iron piston B.the same size as with a cast iron piston C.half as large as with a cast iron piston D.the same size as the crown of an aluminum piston
