HG/T 3707-2003.Fittings of perforated steel skeleton polyethylene composite pipes for industry. 1范围 ...
HG化工标准
HG化工标准
HG化工标准
HG/T 3707-2012 代替HG/T 3707-2003 工业用孔网钢骨架聚乙烯复合管件
HG/T 3707-2012.Fittings of perforated steel skeleton polyethylene composit pipes for industry. 1范围 H...