4235| 11
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近距離時萬有引力的作用中心 |
點評
就是一次矩和二次矩的區別 :D
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Archiver|手機版|小黑屋|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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