當然也是兩個，如果有三個或以上，取其中三個球的圓心做截麵，不就推翻了平麵中兩個的結論了嗎？

來源: 萬斤油於 2022-02-12 10:39:54 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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