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简介: 唐山是中国钢铁工业重要聚集地之一,双金属复合管2011年钢铁产能达到7000万吨,约占到全国1/10。按每生产1吨钢就需要5吨物流量计算,唐山的钢铁物流量至少在35000万吨。    作为钢铁重镇,
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