单选题In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）Alow firing pressureBlow exhaust temperatureCmechanical knock in each cylinderDfuel knock in each cylinder
单选题
In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with（）
A
low firing pressure
B
low exhaust temperature
C
mechanical knock in each cylinder
D
fuel knock in each cylinder
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