Dẻo và bền nhất
- Thầy: Trò nghe đây: sắt thép, đồng…vật liệu nào dẻo dai và bền nhất? - Quỳnh: Thưa thầy là…Thưa thầy cho 5 phút suy nghĩa ạ. Á! Thưa thầy vật dẻo dai và bền nhất đó là...
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