单选题All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）AExcessively early injection timingBCombustion knockCLeaking piston ringsDLight load
单选题
All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）
A
Excessively early injection timing
B
Combustion knock
C
Leaking piston rings
D
Light load
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