9281| 26
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受力情況如圖所示。我們這還是憑經驗做,領導說用50角鋼,我感覺很懸 |
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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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