钢网架超声波探伤与焊缝缺陷的质量分级法 Steel net super voice wave the quality ratings which explore to harm to sew blemish with Han method Chai Bao-ying Xu Hai-liang (1.Taixing city construction engineering examination center Taixing Jiangsu 225400; 2.Xinghua city water conservancy building install an engineering head office xinghua Jiangsu 225700) 【】This text introduction use a specialized design of com