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            <div   id="tltbyqy"   class="date-wrap"> <span id="anxmucg"    class="date"> 07 </span> <span id="fngnwox"    class="month"> 2020-08 </span> </div>
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            <p>&nbsp;消声器的消声原理是利用腔与管的适当�l�合�Q�来辑ֈ�两种作用来消声的�Q?nbsp;<br />
一是利用管道截面突�?卛_��抗的变化)使沿���道传播的声波向声源方向反射回去�Q�从而��声能反射回原处；<br />
二是利用几个界面的反���，使原来第一个向前传播的声�L又回到原点，�q�再�ơ折回向前传播，该点与尚未被反射的第二个向前传播的声波汇合，而且两者在振幅上相�{�，在相位上�?80度的奇数倍，从而互相干涉而抵消�?/p>            <ul class="pager">
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