掌握化学用语是学习化学的基础.下列化学符号中数字表示的意义正确的是 A.2na“2 表示两个钠元素b.co2“2 表示一个二氧化碳 Template




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tomski掌握化学用语是学习化学的基础.下列化学符号中数字表示的意义正确的是 a.2na“2 表示两个钠元素b.co2“2 coloring