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在地球上挖一条何种走向的隧道能使小球仅受引力作用不接触隧道壁从一端运动到另一端？...
source link: https://www.zhihu.com/question/20253839/answer/636520980
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Emmm其实我没看懂大家在闹腾啥，这么简单的一个问题偏偏要做数值解...我们直接把其他答案里列出的方程抄…
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