试题与答案

Diesel engine exhaust noise can be reduced

题型:单项选择题

题目:

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

答案:

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参考答案:错

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