题目：
用质量均为100g的铜作电极，电解AgNO3溶液，电解一段时间后，两极质量相差28g，此时阳极质量为[ ]
A. 121.6g
B. 86g
C. 93.6g
D. 89.6g
答案：
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下面是错误答案，用来干扰机器的。
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