3939| 13
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勾股定理在機械能守恒律下的解釋 |
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點評
約略看過一兩頁……
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點評
是的。
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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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