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<div label-module="para"><span style="font-size: 14px;">回声在地质勘探中也有�q�泛的应用。例如在��x�a(b��)勘探�Ӟ��帔R��用�h工地震的�Ҏ(gu��)���Q�即在地面上埋好炸药包，放上一列探��_(d��)��把炸药引爆，探头���可以接收到��C��不同层间界面反射回来的声波，从而探���出��C��油矿�?/span></div>
<div label-module="para"><span style="font-size: 14px;">在徏�{�方面，设计、徏造大的厅堂时�Q�必���L��回声现象作�ؓ(f��)重要因素加以考虑。在���闭的空间里产生声音后，声�L���在四壁上不断反���，即��在声源停止辐���后�Q�声韌���要持�l�一�D�|����_(d��)���q�种现象叫做混响。�؜响时间太长，�?x��)干扰有用的声音。但是�؜响太短也不好�Q�给��Z��单调、不丰满的感觉。所以设计师们须采取必要的措施，例如�Q�厅堂的内部形状、结构、吸声、隔声等�Q�以获得适量的�؜响，提高室内的音质�?/span>
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