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關于鋼管強度問題 |
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點評
主打一個可有可無的部分,,不然就是Q345加焊接
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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,,浙公網安備33038202004372號 )
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