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【单选题】
下列配合物中配位数与其余几个不相同的是：A.
[Ni(NH3)2（en）2]2+
B.
[Ni(edta)]2-
C.
K3[Fe(CN)6]
D.
K2[HgI4]
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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