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<p><span style="font-size: 14px;">&nbsp;��M��材料对入���声能或多或���都有一些吸声能力，�q�_��吸声�p�L�����过0.2的材料才�U�Cؓ(f��)</span><span style="font-size: 14px;">吸声材料</span><span style="font-size: 14px;">。多孔吸声材料吸声频率的�Ҏ(gu��)��是:中高频吸声系数较大，低频吸声�p�L��较小�?/span></p>
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