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课程 2
Water and solutions
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
Water is H₂O: two hydrogen atoms and one oxygen. It dissolves salt, sugar and much more. When a substance dissolves, we get a solution.
🧂 Not everything dissolves: oil does not disappear in water — it floats as droplets.