题目：
将500ml PH=5的硫酸铜溶液用惰性电极电解一段时间后，溶液PH变为2（设电解前后溶液的体积不变）。若使溶液的浓度、PH与电解前相同，可以向电解后的溶液中加入[ ]
A．0．245g Cu(OH)2
B．0．31g CuCO3
C．0．0025mol H2SO4
D．0．2g CuO
答案：
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