单选题Injection lag in a diesel engine may be caused by（）Aa higher cetane number of fuel oilBthe diesel fuel used having a high viscosityCmechanical rigidity in the lube pump mechanismDa decrease rigidity in the fuel pump delivery pressure
单选题
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
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