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

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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