国内外焊接内螺纹铜管与无缝内螺纹铜管的技术发展状况

国内外焊接内螺纹铜管与无缝内螺纹铜管的技术发展状况的英文翻译

基本释义

• Situation of technological develop ment of welding internal -thread cop per tubes and seamless internal -thread coppertubes at home and abroad