【简答题】
电极反应Ni<sup>2+</sup>+2e<sup>-</sup>====Ni(s)的<img src='http://221.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cyA9LTAuMjVW' class='match'/>，则2Ni<sup>2+</sup>+4e<sup>-</sup>====2Ni(s)的<img src='http://221.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cw%3D%3D' class='match'/>______，Ni(s)-2e<sup>-</sup>====Ni<sup>2+</sup>的<img src='http://221.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cw%3D%3D' class='match'/>______。<br/>A.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cyA9LTAuMjVW'<br/>B.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cw%3D%3D'<br/>C.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cw%3D%3D'
A、A.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cyA9LTAuMjVW'
B.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cw%3D%3D'
C.174.24.96:6088/Latex/latex.action?latex=XHBoaSBeXG9taW51cw%3D%3D'
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