Ab两种元素的相对原子质量都是两位数a元素的相对原子质量的个位数和十位数与b元素的相对原子质量的个位数与十位数刚好颠倒过来且2a B点燃 Template




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tomskiab两种元素的相对原子质量都是两位数a元素的相对原子质量的个位数和十位数与b元素的相对原子质量的个位数与十位数刚好颠倒过来且2a b点燃 coloring