单选题The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）Aprovide exhaust back pressureBprevent exhaust smoke emissionsCpower a reciprocating superchargerDmuffle exhaust gas noise
单选题
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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