钢结构大六角螺栓 High-Strength Hexagon Bolts With Large Widths Across Flats For Structural Bolting
预负载用高强度结构螺栓连接副,第4部分:HV系统 - 六角螺栓 High-strength Structural Bolting Assemblies for Preloading - Part 4: System HV - Hexagon bolts
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