Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.<br>A:a shortened ignition delay period<br>B:a lean fuel/air mixture<br>C:excess fuel in the combustion chamber<br>D:rapid vaporization of injected fuel droplets

Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
A:a shortened ignition delay period
B:a lean fuel/air mixture
C:excess fuel in the combustion chamber
D:rapid vaporization of injected fuel droplets

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