NFF01-812-1 铁路车辆 钢的电弧焊接和电阻焊接 第1部分:对接焊点和角焊接
NFF01-812-1 Railway rolling stock.Artand resistance welded joints of steels.Part1:acceptance criteria for defect sinwelded buttand corner joints
中国防火网全国免费咨询电话:400-666-7290
网址:www.firete.com
邮箱:info@firete.com