1秒的长度是如何规定出来的?为何1小时等于60分?一天是24小时?为何1个时辰等于两个小时?
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![1秒的长度是如何规定出来的?为何1小时等于60分?一天是24小时?为何1个时辰等于两个小时?](/uploads/image/z/1005266-2-6.jpg?t=1%E7%A7%92%E7%9A%84%E9%95%BF%E5%BA%A6%E6%98%AF%E5%A6%82%E4%BD%95%E8%A7%84%E5%AE%9A%E5%87%BA%E6%9D%A5%E7%9A%84%3F%E4%B8%BA%E4%BD%951%E5%B0%8F%E6%97%B6%E7%AD%89%E4%BA%8E60%E5%88%86%3F%E4%B8%80%E5%A4%A9%E6%98%AF24%E5%B0%8F%E6%97%B6%3F%E4%B8%BA%E4%BD%951%E4%B8%AA%E6%97%B6%E8%BE%B0%E7%AD%89%E4%BA%8E%E4%B8%A4%E4%B8%AA%E5%B0%8F%E6%97%B6%3F)
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