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【单选题】
用惰性电极电解下列足量溶液，一段时间后，再加入一定量的另一种物质(括号内物质)，溶液与原来溶液完全一样的是 （ ）A.
NaCl（盐酸）
B.
NaOH（NaOH）
C.
AgNO 3 （Ag 2 O）
D.
CuSO 4 [Cu(OH) 2 ]
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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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