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圓管外壁滾花如何加工出來呢?成本盡量低 |
點評
塑料的?中間會打滑吧?
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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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