单选题Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.Aa shortened ignition delay periodBa lean fuel/air mixtureCexcess fuel in the combustion chamberDrapid vaporization of injected fuel droplets
单选题
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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