If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）<br>A:early injection timing<br>B:worn orifices in the injection nozzles<br>C:worn or scored cylinder liners<br>D:using a fuel with too low of a cetane number

If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）
A:early injection timing
B:worn orifices in the injection nozzles
C:worn or scored cylinder liners
D:using a fuel with too low of a cetane number

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