请问地陷与物理有关吗？为什么是圆的？

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ymmplay

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Jun 5, 2010, 10:56:34 AM6/5/10
to 理论物理TheoryPhysics
http://groups.google.com.hk/group/ymmplay/web/%E9%AB%98%E9%80%9F%E5%85%AC%E8%B7%AF%E4%B8%8A%E7%AA%81%E7%84%B6%E5%A1%8C%E9%99%B7%E7%9A%84%E6%B7%B1%E5%9D%91
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