The variations of special welding processes are described based on the welding handbook (4th~8th Ed.) published in 1960~l991 by American welding society (AWS).是什么意思_The variations of special welding processes are described based on the welding handbook (4th~8th Ed.) published in 1960~l991 by American welding society (AWS).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句