单选题Diesel engine exhaust noise can be reduced in an exhaust muffler by （）Achanging the direction of exhaust gas flowBincreasing the exhaust gas velocityCchanging the exhaust gas weightDincreasing the exhaust gas static pressure
单选题
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
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