CO2 gas shield arc welding is of high effciency, low cost advance welding technology and widely used in the field of metal structure manufacturing.是什么意思_CO2 gas shield arc welding is of high effciency, low cost advance welding technology and widely used in the field of metal structure manufacturing.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句