写出下列符号中“2 的意义.�$stackrel{ 2}{ca}o$氧化钙中钙元素的化合价为 2价 �原子核外第2层上有2个电子�2o氧 Template




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tomski写出下列符号中“2 的意义.�$stackrel{ 2}{ca}o$氧化钙中钙元素的化合价为 coloring