地面上的空气成分主要以氧氮分子为主随着高度的增加由于地球引力的作用重的气体逐渐稀薄轻的气体逐渐相对增多.在太阳紫外光线的照射下分子 Template




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tomski地面上的空气成分主要以氧氮分子为主随着高度的增加由于地球引力的作用重的气体逐渐稀薄轻的气体逐渐相对增多.在太阳紫外光线的照射下分子 coloring