UDC中华人民共和国国家标准孕PGB50303-2002建筑电气工程施工质量验收规范Code of acceptance of construction qualityof electrical installation in buildingwww.sinoaec.comGB2002一04-01发布...
UDC621.882.2.092:621.791September 1986Weld studs丽525AnschweiBendenSupersedes November 1970 edition.In keeping with current practice in standards published by the International Org...