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含PO43-的电解质不能跟下列哪个离子直接混合（）

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含PO43-的电解质不能跟下列哪个离子直接混合（）

A.Na+

B.K+

C.Mg2+

D.Ca2+

E.Cl-

参考答案:

答案：Ca2+

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