单选题Late fuel injection in a diesel engine is indicated by low firing pressure with （）Alow exhaust temperatureBlow exhaust pressureCmechanical knock in each cylinderDblack or gray exhaust smoke
单选题
Late fuel injection in a diesel engine is indicated by low firing pressure with （）
A
low exhaust temperature
B
low exhaust pressure
C
mechanical knock in each cylinder
D
black or gray exhaust smoke
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