URL:https://static.vecteezy.com/system/resources/previews/038/147/341/non_2x/the-blast-furnace-is-a-towering-industrial-structure-that-transforms-iron-ore-into-molten-iron-using-intense-heat-coke-and-limestone-vital-in-steel-production-metallurgy-concept-vector.jpg
掲載元:https://www.vecteezy.com/vector-art/38147341-the-blast-furnace-is-a-towering-industrial-structure-that-transforms-iron-ore-into-molten-iron-using-intense-heat-coke-and-limestone-vital-in-steel-production-metallurgy-concept