High firing pressures and a low exhaust temperature in a diesel engine may result from （）.<br>A:decreased piston to cylinder head clearance<br>B:increased exhaust system back pressure<br>C:early fuel injection timing<br>D:low scavenge air temperature

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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