GBT 1229-2006 钢结构用高强度大六角螺母.pdf
GBT 3632-2008钢结构用扭剪型高强度螺栓连接副.pdf
GB 3098-2-2000紧固件机械性能 螺母 粗牙螺柱.pdf
GB3098-1-82+紧固件机械性能+螺栓、螺钉和螺柱.pdf
GB3098-1-2000紧固件机械性能_螺栓、螺钉和螺柱.pdf
GBT3098-10-1993紧固件机械性能-有色金属制造的螺栓、螺钉、螺柱和螺母.pdf
GBT3098-1-2010 紧固件机械性能 螺栓、螺钉和螺柱.pdf
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