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【热镀锌钢管国标壁厚】眉山大口径厚壁钢管今日报价摘要：选好质

发布者：天津钢管集团股份彩95　　发布时间：2020-01-14　　阅读：次

终极把料进选好原料后，按直缝管标准下料，再思虑科学半径，比方，11°的直缝管，颠末其科学算出下多么长料可加工出12°的直缝管

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