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
单项选择题 Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by（）
单项选择题 Improperly fitted piston rings in a diesel engine can cause（）
单项选择题 Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）
