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[imghttp://www.xhgmw.org/uploads/day_101118/201011180942252552.jpg[/img]
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没有哪一个参考系相对于其它参考系是特殊的.
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[imghttp://www.xhgmw.org/uploads/day_101118/201011180942252552.jpg[/img]
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没有哪一个参考系相对于其它参考系是特殊的.
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