单项选择题
A.increase engine power B.increase engine load C.decrease engine power D.improve fuel economy
Diesel engine injection lag is caused by（）A.compressibi...
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
Abnormal crankpin bearing and piston skirt surface wear...
单项选择题Abnormal crankpin bearing and piston skirt surface wear indicate（）
A.a restricted air intake B.a clogged connecting rod oil passage C.incorrect connecting rod alignment D.high cylinder firing temperatures
Injection lag in a diesel engine may be caused by（）A.a ...
单项选择题Injection lag in a diesel engine may be caused by（）
A.a higher cetane number of fuel oil B.the diesel fuel used having a high viscosity C.mechanical rigidity in the lube pump mechanism D.a decrease rigidity in the fuel pump delivery pressure
