5227| 14
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一根2m長的空心鋼管水平放置,在自身重力作用下?lián)隙仁嵌嗌伲?/span> |
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點評
意義不大,你查查彈性模量差多少。
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Archiver|手機版|小黑屋|機械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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