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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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decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
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low firing pressureB
low exhaust temperatureC
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injector pumpB
fuel injectorC
governorD
turbocharger
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单选题The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.A
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raw water pump dischargeB
expansion tank outletC
cooling water heat exchangerD
outlet engine jacket water outlet
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