Injection lag in a diesel engine may be caused by（）<br>A:a higher cetane number of fuel oil<br>B:the diesel fuel used having a high viscosity<br>C:mechanical rigidity in the lube pump mechanism<br>D:a decrease rigidity in the fuel pump delivery pressure

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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