单项选择题
Diesel engine injection lag is caused by（）
A.compressibility of the fuel B.high fuel oil supply flow C.scored plunger and barrel packing D.excessive air turbulence
单项选择题 Abnormal crankpin bearing and piston skirt surface wear indicate（）
单项选择题 Injection lag in a diesel engine may be caused by（）
单项选择题 Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）
