double carbon-arc welding双: two; twin; both; dual碳素: carbon极: I the utmost point; extreme电弧焊接: arc welding炭极电弧焊接: carbon electrode arc welding下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:双碳素极电弧焊接，即可在微信中查询翻译
