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Practice Listening: Fill in the Blanks (Type In)
ID: #34309
Short
Iron and Steel
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The advancement in the art of iron and steel is considered by many as one of the most significant happenings in the history of civilization. However, iron was not as used as steel until the creation of the blast furnace, which made quantities of the metal accessible. Afterward, the development of methods for refining steel on a larger scale was created, the Bessemer method and open-hearth processes. At present, the yielding of iron and steel is roughly 15 times that of all other metals combined. In addition, steel can be produced in amounts at a small expense.
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