单选题Combustion knock occurring in a diesel engine can be caused by （）.Aexcessive fuel penetrationBprolonged injection lagCreduced ignition lagDprolonged ignition lag
单选题
Combustion knock occurring in a diesel engine can be caused by （）.
A
excessive fuel penetration
B
prolonged injection lag
C
reduced ignition lag
D
prolonged ignition lag
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