ISO 389-7:2005/Amd 1:2016現(xiàn)行
Acoustics - Reference zero for the calibration of audiometric equipment Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions - Amendment 1: Reference threshold of hearing at 20 Hz and 18 000 Hz under free-field listening conditions and at 20 Hz under diffuse-field listening conditions
出版：International Organization for Standardization
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