abcdef是元素�期表前四�期中的常见元素原子序数依次增大相关信息如下表元素相关信息a可形成自然界硬度最大的单质b与a元素同 Template




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tomskiabcdef是元素�期表前四�期中的常见元素原子序数依次增大相关信息如下表元素相关信息a可形成自然界硬度最大的单质b与a元素同 coloring