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八年级物理第二章声现象：2.4噪声的危害和控制
2.4噪声的产生与控制【八年级物理上册《学霸笔记》已完成，有需要电子版的亲友，可关注＋转发，私信“学霸笔记八上”获取】
八年级物理上册教学视频（人教版）8/26
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