2的平方和氧气的化学式书写时的那个角标怎么打出来?
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![2的平方和氧气的化学式书写时的那个角标怎么打出来?](/uploads/image/z/3420116-44-6.jpg?t=2%E7%9A%84%E5%B9%B3%E6%96%B9%E5%92%8C%E6%B0%A7%E6%B0%94%E7%9A%84%E5%8C%96%E5%AD%A6%E5%BC%8F%E4%B9%A6%E5%86%99%E6%97%B6%E7%9A%84%E9%82%A3%E4%B8%AA%E8%A7%92%E6%A0%87%E6%80%8E%E4%B9%88%E6%89%93%E5%87%BA%E6%9D%A5%3F)
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