用化学用语填空: ①人体中含量最多的物质:              

用化学用语填空:

①人体中含量最多的物质:              ;②组成化合物最多的元素:             

2个亚铁离子:                       ;④甲烷中碳元素显-4               

答案

H2O    C    2Fe2+   

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