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在研究和实践的基础上，阐述了氧化亚铁、三氧化二铁、四氧化三铁在铸造生产中防止铸件缺陷的作用。
On the basis of research and practice, the effects of preventing defects of castings during the production of castings by ferrous oxide, ferric oxide and ferroferric oxide are expounded.