元素�期表是学习和研究化学的重要工具如图是元素�期表中元素的示意图下列关于硅元素的说法正确的是a相对原子质量是14b中子数是28c Template




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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


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tomski元素�期表是学习和研究化学的重要工具如图是元素�期表中元素的示意图下列关于硅元素的说法正确的是a相对原子质量是14b中子数是28c coloring