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【单选题】
有三种电极表示式 : (1) Pt,H 2 ( p $ )│H + ( a =1), (2)Cu│Pt,H 2 ( p $ )│H + ( a =1), (3) Cu│Hg(l)│Pt,H 2 ( p $ )│H + ( a =1) ,则氢电极的电极电势彼此关系为A.
逐渐变大
B.
逐渐变小
C.
不能确定
D.
彼此相等
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