单项选择题
A.chromium plating piston rings
B.knurling the piston skirt
C.extended maximum power operation
D.applying load to a cold diesel engine
单项选择题 If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）
单项选择题 Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）
单项选择题 Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）