单选题If a diesel engine is smoking excessively under load, the cause could be （）Alow exhaust back pressureBearly fuel injection in one of the cylindersCcompression pressure in one of the cylindersDplugged injector holes
单选题
If a diesel engine is smoking excessively under load, the cause could be （）
A
low exhaust back pressure
B
early fuel injection in one of the cylinders
C
compression pressure in one of the cylinders
D
plugged injector holes
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