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【单选题】
人体内的微量元素是指总含量不到万分之一，质量之和不到人体质量千分之一的二十多种元素，这些元素对人体的正常发育和健康起着重要作用，下列各组元素全部是微量元素的是（ ）A.
Na、Cl、O
B.
Fe、Zn、I
C.
P、C、Mg
D.
Fe、N、H
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