downward welding的意思|示意
平焊，俯焊
downward welding相关短语
1、 vertical downward welding 向下立焊
2、 vertical-downward welding 从上到下立焊
3、 verticing downward welding 向下立焊
4、 downward welding technique 下向焊技术
5、 Welding vertically downward 垂直的从上往下焊
6、 welding upward and downward 向下向上焊