给瑞网友布置一道数学作业。以四点五光年做半径，划一个球，先算一下这个球的体积，然后拿太阳的质量，去除这个体积，

来源: 蒋闻铭于 2026-03-25 11:13:05 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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