求教!太阳上是些什么物质?为什么会发光发热?
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![求教!太阳上是些什么物质?为什么会发光发热?](/uploads/image/z/6224579-35-9.jpg?t=%E6%B1%82%E6%95%99%21%E5%A4%AA%E9%98%B3%E4%B8%8A%E6%98%AF%E4%BA%9B%E4%BB%80%E4%B9%88%E7%89%A9%E8%B4%A8%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BC%9A%E5%8F%91%E5%85%89%E5%8F%91%E7%83%AD%3F)
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