单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.Adecreased piston to cylinder head clearanceBincreased exhaust system back pressureCearly fuel injection timingDlow scavenge air temperature
单选题
High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A
decreased piston to cylinder head clearance
B
increased exhaust system back pressure
C
early fuel injection timing
D
low scavenge air temperature
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