“ineffectiveness of high frequency”的概念、定义、翻译、参考文献-科学参考

单词	ineffectiveness of high frequency
释义	ineffectiveness of high frequency Encyclopedia 工学高频失效释 ineffectiveness of high frequency高频失效当噪声以平面波进入消声器的平直的介质流通通道，通道横截面尺寸一定时，频率越高（波长越短）的噪声就有越大的比例接触不到消声构件的壁面，消声构件对这些高频噪声的衰减作用逐渐减弱直至消声效果可以忽略的现象。
随便看	Bulletin of the Library Association of China Bulletin of the Museums Association of China Bulletin of the Seismological Society of America Bulletin on God-Thanking Opera by Li Wenmao the King of Pacification bulletins Bulletin Signaletique bullet mark bullet nose curve bulletproof and bomb suppression felts and blankets bullet proof car bullet-proof clothing bullet-proof door bullet-proof glass bulletproof materials bullet screens Bull Fighting bull frog bullfrog breeding bullfrog culture bullfrog seed culture bull graph bullhead sharks bulliform bulliform cell bullion lead

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