Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and （）<br>A:low exhaust temperature<br>B:low firing pressure<br>C:fuel knock in each cylinder<br>D:mechanical knock in each cylinder

Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and （）
A:low exhaust temperature
B:low firing pressure
C:fuel knock in each cylinder
D:mechanical knock in each cylinder

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