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<div>声音的另一�U�传播就是跨介质传播。即从一�U�介质，�I�过两种介质的��(f��)界接触面�q�入另一�U�介质，此时�Q�声能的传递实质是振动�q�度的传递。跨介质传播�Ӟ��两种介质的密度相差越大，声能的损耗越大。而实际应用中�Q�空气�ؓ(f��)人类常态下�z�d���I�间�Q�于是与�I�气密度相差���大的材料一般�ؓ(f��)密度很高的材料（比空气密度还要低很多的材料除�?ji��n)真�I�，�q�真的不多）(j��)�Q�即可视为隔��x��料。密度越高，隔音效果���好。这��L(f��ng)��材料制成的板材，�U�Cؓ(f��)隔音�ѝ�?/div>
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