根据下图，可判断出下列离子方程式中错误的是
| A．2Ag(s)+Cd2+(aq)==2Ag+(aq)+Cd(s) |
| B．Co2+(aq)+Cd(s)==Co(s)+Cd2+(aq) |
| C．2Ag+(aq)+Cd(s)==2Ag(s)+Cd2+(aq) |
| D．2Ag+(aq)+Co(s)==2Ag(s)+Co2+(aq) |
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