This paper introduces the function of magnetic rod in the H.F. welding of longitudinally welded pipe and correct select installation and use of magnetic rod.是什么意思_This paper introduces the function of magnetic rod in the H.F. welding of longitudinally welded pipe and correct select installation and use of magnetic rod.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句