If a diesel engine is smoking excessively under load, the cause could be （）<br>A:low exhaust back pressure<br>B:early fuel injection in one of the cylinders<br>C:compression pressure in one of the cylinders<br>D:plugged injector holes

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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