单选题In an operating diesel engine, pre-ignition can be caused by （）Aexcessively late fuel injectionBoil in the air chargeCwater in the fuelDinjection continuing after the fuel charge is ignited
单选题
In an operating diesel engine, pre-ignition can be caused by （）
A
excessively late fuel injection
B
oil in the air charge
C
water in the fuel
D
injection continuing after the fuel charge is ignited
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