能使反应Cu＋2H2O=Cu(OH)2↓＋H2↑发生且Cu(OH)2能在电极上析出的是( )
A：铜片作原电池负极，碳棒为正极，NaCl溶液作电解质溶液
B：用铜片作阴、阳极，电解Na2SO4水溶液
C：铜片作阴、阳极，电解NaOH水溶液
D：铜片作阴、阳极，电解CuSO4水溶液
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