Welding Technique of Automatical Hidden Arc Overlay Welding for Matching Surface Between Bell and Hopper of Blast Furnace是什么意思_Welding Technique of Automatical Hidden Arc Overlay Welding for Matching Surface Between Bell and Hopper of Blast Furnace在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句