Combustion knock occurring in a diesel engine can be caused by （）.<br>A:excessive fuel penetration<br>B:prolonged injection lag<br>C:reduced ignition lag<br>D:prolonged ignition lag

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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