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想設(shè)計一根長度30cm直徑4mm一端在90度范圍內(nèi)自由彎曲的桿子? |
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小黑屋|手機版|Archiver|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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