Diesel engine mufflers accomplish noise reduction by （）<br>A:reducing exhaust gas velocity<br>B:increasing the frequency of gas vibration<br>C:the use of long head pipes<br>D:the use of zinc electrodes

Diesel engine mufflers accomplish noise reduction by （）
A:reducing exhaust gas velocity
B:increasing the frequency of gas vibration
C:the use of long head pipes
D:the use of zinc electrodes

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