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【单选题】
已知反应Cu(s) + 2Ag + (aq) = Cu 2+ (aq) + 2Ag(s)为一自发进行的氧化还原反应，将其设计成如图所示原电池。下列说法中正确的是A.
电极X是正极，其电极反应为Cu－2e － ＝Cu 2+
B.
银电极质量逐渐减小，Y溶液中c(Ag + )增大
C.
实验过程中取出盐桥，原电池仍继续工作
D.
当X电极质量减少0.64 g时，外电路中有0.02 mol电子转移
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