SIS SS 02 52 59-1986 Building acoustics - Noise absorber - Rating of measurement result《建筑声学 噪音吸收 测量结果等级》.pdf

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STAS 12203 2-1983 Building acoustics DESIGN OF ANECHOIC AND SE- MIANEGHOIC ROOMS General requirements《建筑声学 无回声和半无声设计房间的总体要求 》.pdf

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