“noise reduction coefficient”的概念、定义、翻译、参考文献-科学参考

单词	noise reduction coefficient
释义	noise reduction coefficient [`nȯiz ri´dǝk·shǝn ´kō·i`fish·ǝnt] ^ACOUSTICS The average over the logarithm of frequency, in the frequency range from 256 to 2048 hertz inclusive, of the sound absorption coefficient of a material.
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