Late fuel injection in a diesel engine is indicated by low firing pressure with （）<br>A:low exhaust temperature<br>B:low exhaust pressure<br>C:mechanical knock in each cylinder<br>D:black or gray exhaust smoke

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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