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标准号 英文名称 中文名称A1-00(2005) Standard Specification for Carbon Steel Tee Rails 碳素钢丁字轨A2-02 Standard Specification for Carbon Steel Girder Rails of Plain, Grooved, and GuardTypes 普通型，带槽和防护型碳素工字钢轨A3-01(2006
第一课Text:It is known that metals are very important in our life. Metals have the greatest importance for industry. All machines and other engineering[7endVi5niEriN] constructions have metal[5metl] part
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