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| external fuel (During steelmaking by Bessemer converter no external fuel was applied and the whole of the heat requirement was furnished by the oxidation of the impurities, together with that of some of the metallic iron. 贝塞麦转炉炼钢期间，无需添加外来燃料，所需的全部热量均由杂质和部分金属铁的氧化热提供。) | |||
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外来 燃料 : 1 phrase in 1 subject |
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