a1s2d3f4 发表于 2020-3-18 10:05:53

求 ISO 11654-1997 Acoustics -- Sound absorbers for use in buildings -- Rating o

求 ISO 11654-1997 Acoustics -- Sound absorbers for use in buildings -- Rating of sound absorption

liuxilin1215 发表于 2020-3-18 10:05:54

ISO 11654-1997 Acoustics - Sound absorbers for use in buildings - Rating of sound absorption




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