Abcdef为原子序数依次增大的六种元素a的一种同位素可用于考古测定生物的死亡年代c原子的最外层电子数是次外层的3倍d与b同主 Template




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tomskiabcdef为原子序数依次增大的六种元素a的一种同位素可用于考古测定生物的死亡年代c原子的最外层电子数是次外层的3倍d与b同主 coloring