7686| 15
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這個結構的穩定性怎樣計算 |
點評
鉸接處會不會出現失效啊
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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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