The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）<br>A:provide exhaust back pressure<br>B:prevent exhaust smoke emissions<br>C:power a reciprocating supercharger<br>D:muffle exhaust gas noise

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）
A:provide exhaust back pressure
B:prevent exhaust smoke emissions
C:power a reciprocating supercharger
D:muffle exhaust gas noise

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