利用这些图就可方便地得到吸气管道内风机辐射声功率级和声压级的关系。

Finally figures of direction coefficient of sound pressure level are given out. Then using these figures the relationship between sound power level and sound pressure level radiated by a fan in...

youdao

利用这些图就可方便地得到吸气管道内风机辐射声功率级和声压级的关系。

Finally figures of direction coefficient of sound pressure level are given out. Then using these figures the relationship between sound power level and sound pressure level radiated by a fan in...

youdao