单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）Aearly injection timingBworn orifices in the injection nozzlesCworn or scored cylinder linersDusing a fuel with too low of a cetane number
单选题
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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