Diesel engine mufflers or silencers reduce the engine exhaust noise by （）<br>A:passing the exhaust through long head pipes<br>B:diffusing exhaust vibrations through activated carbon baffles<br>C:increasing the exhaust gas velocity<br>D:reducing the exhaust gas velocity

Diesel engine mufflers or silencers reduce the engine exhaust noise by （）
A:passing the exhaust through long head pipes
B:diffusing exhaust vibrations through activated carbon baffles
C:increasing the exhaust gas velocity
D:reducing the exhaust gas velocity

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