This paper deals with a new type square wave power supply for A.C. arc welding in which very fast switching element IGBT is used for its inverter.是什么意思_This paper deals with a new type square wave power supply for A.C. arc welding in which very fast switching element IGBT is used for its inverter.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句