甲状腺激素、血红蛋白和叶绿素中含有的重要元素依次是(    )

甲状腺激素、血红蛋白和叶绿素中含有的重要元素依次是(   

   AI FeMg                         BCuMg

CIMgFe                         DFeMgI

答案

A

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