【国家标准】 GB T 1228-2006 钢结构用高强度大六角头螺栓 标准.pdf
gbt_1228-2006_钢结构用高强度大六角头螺栓.pdf
钢结构用高强度大六角头螺栓Highstrengthboltswithlargehexagonheadforsteelstructures[ISO7412:1984,Hexagonboltsforhighstrengthstructur...