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Strontium is a chemical component with image Sr and atomic variety 38. An alkaline earth metal, strontium can be a smooth silver-white or yellowish metallic factor that is very reactive chemically. The metallic turns yellow when it truly is subjected to air. YttriumMÁY SẢN XUẤT TÚI GIẤY Máy sản xuất túi giấy cuộn – túi purchasi