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钢材是一种重要的金属材料,硬度大、韧性好、不易变形。我们生活中处处都有钢材:楼房的钢筋、大桥的钢梁、汽车的车身、桌椅的支架,都离不开它。钢材坚固耐用,还能回收再利用,既环保又节约资源。它默默奉献,不怕风雨,不怕重压,就像勇敢坚强的卫士,守护着我们的生活,推动着社会不断向前发展。3101
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