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简介：6A83D730I9T永年P必将对改善水质、提高人们生活水平发挥无可比较的作用。建筑给水管系中，由于镀锌钢管已经结束了百年辉煌的历史，各种新型塑料管及复合管得到迅速发展，但各种管材还不同水平地存在着一些不足，远不能完全适应供水管系的需要和国
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