YB/T 4181-2008 双焊缝冷弯方形及矩形钢管 标准文件下载
千亿体育biaozhunhao yb/t 4181-2008
千亿体育faburiqi 2008-03-12
千亿体育shishiriqi 2008-09-01
千亿体育zhongguobiaozhunfenleihao h44
guojibiaozhunfenleihao 77.140.70
guikoudanwei quanguogangbiaozhunhuajishuweiyuanhui
千亿体育zhuguanbumen guojiafazhanhegaigeweiyuanhui
千亿体育xingyefenlei wu
千亿体育beianhao:25102-2008。
beiangonggao: 2008niandi11hao 。
英文名称: Double-seam welded square and rectangular tubes
标准原文PDF文件下载:
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