I HF electrothermal equipment production company, be applied to smelting. Qian welding. heat treatment. forging HF Hanguan. large direct current generator mechanics.是什么意思_I HF electrothermal equipment production company, be applied to smelting. Qian welding. heat treatment. forging HF Hanguan. large direct current generator mechanics.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句