短語詞組短語ladle arc refining furnace 鋼包爐Ladle refining furnace transformers 鋼包精鍊爐變壓器teeming ladle refining furnace 盛鋼桶精鍊爐ladle furnace refining LF 精鍊refining ladle furnace 精鍊鋼包ladle furnace lf refining process lf 精鍊過程 返回 ladle refining furnace