1.墙壁是固体,传声效果比空气要好得多,但是当我们把门窗关紧以后会发现外面传如室内的声音明显减弱,这是为什么?2.在帮奶奶向针孔穿线时,若你用左手执针,放在眼前一定距离,闭上一只眼,
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![1.墙壁是固体,传声效果比空气要好得多,但是当我们把门窗关紧以后会发现外面传如室内的声音明显减弱,这是为什么?2.在帮奶奶向针孔穿线时,若你用左手执针,放在眼前一定距离,闭上一只眼,](/uploads/image/z/11624090-50-0.jpg?t=1.%E5%A2%99%E5%A3%81%E6%98%AF%E5%9B%BA%E4%BD%93%2C%E4%BC%A0%E5%A3%B0%E6%95%88%E6%9E%9C%E6%AF%94%E7%A9%BA%E6%B0%94%E8%A6%81%E5%A5%BD%E5%BE%97%E5%A4%9A%2C%E4%BD%86%E6%98%AF%E5%BD%93%E6%88%91%E4%BB%AC%E6%8A%8A%E9%97%A8%E7%AA%97%E5%85%B3%E7%B4%A7%E4%BB%A5%E5%90%8E%E4%BC%9A%E5%8F%91%E7%8E%B0%E5%A4%96%E9%9D%A2%E4%BC%A0%E5%A6%82%E5%AE%A4%E5%86%85%E7%9A%84%E5%A3%B0%E9%9F%B3%E6%98%8E%E6%98%BE%E5%87%8F%E5%BC%B1%2C%E8%BF%99%E6%98%AF%E4%B8%BA%E4%BB%80%E4%B9%88%3F2.%E5%9C%A8%E5%B8%AE%E5%A5%B6%E5%A5%B6%E5%90%91%E9%92%88%E5%AD%94%E7%A9%BF%E7%BA%BF%E6%97%B6%2C%E8%8B%A5%E4%BD%A0%E7%94%A8%E5%B7%A6%E6%89%8B%E6%89%A7%E9%92%88%2C%E6%94%BE%E5%9C%A8%E7%9C%BC%E5%89%8D%E4%B8%80%E5%AE%9A%E8%B7%9D%E7%A6%BB%2C%E9%97%AD%E4%B8%8A%E4%B8%80%E5%8F%AA%E7%9C%BC%2C)
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