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一個簡易的升降貨梯 |
點評
還沒有完工。鋼絲繩一是平衡,二是安全保險考慮。
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小黑屋|手機版|Archiver|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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