写出下列符号中“2 的意义.� 2cao氧化钙中钙元素化合价为 2价氧化钙中钙元素化合价为 2价�ca2 钙离子带2个单位的正电荷钙离子带2 Template




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tomski写出下列符号中“2 的意义.� 2cao氧化钙中钙元素化合价为 coloring