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- 問題詳情：Themetalthathasbeenmostimportanttomanisiron（鐵）.Likemanyofthemostimportantdiscoveriesofman,howironwasfirstdiscoveredandusedisnotknown.Steelismadefromiron.Itisbetterthanironinstrength,hardness,andelasticity(**).Therearemanykindsofsteelwhicharema...
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