單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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