Diesel engine exhaust noise can be reduced in an exhaust muffler by （）<br>A:changing the direction of exhaust gas flow<br>B:increasing the exhaust gas velocity<br>C:changing the exhaust gas weight<br>D:increasing the exhaust gas static pressure

Diesel engine exhaust noise can be reduced in an exhaust muffler by （）
A:changing the direction of exhaust gas flow
B:increasing the exhaust gas velocity
C:changing the exhaust gas weight
D:increasing the exhaust gas static pressure

出自：海船船员证

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