acoustical insulation material
隔音材料（Acoustical insulation material）：用来阻 绝空气中声音进入室内材料。 39.
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Sound absorption and insulation is the acoustical characteristic of material. Measurement of sound absorption and insulation has an important significance in noise control and acoustical design.
吸声与隔声是材料的声学特性，吸声与隔声测量对噪声控制与声学设计具有重要意义。
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