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【单选题】
在氯化铁和氯化铜的混合溶液中加入过量的，搅拌使其充分反应，所得固体残渣的质量与原的质量恰好相等，则原溶液中FeCl 3 和CuCl 2 的物质的量之比为（ ）A.
．7：3
B.
2：7
C.
5：4
D.
2：5
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C.
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