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水冷炉盖 shuǐlěng lúgài
met. water-cooled cover; water-cooled roof (The ladle furnace is lined with a basic lining and equipped with inert gas stirring device, heating system and water-cooled roof. 这座钢包炉衬有碱性炉衬,装备有惰性气体搅拌装置、加热系统和水冷炉顶。)