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【单选题】
对于电池反应 Cu 2+ + Zn = Cu + Zn 2+ ,下列说法正确的是 ( ) 。A.
当 c(Cu 2+ ) ＝ c(Zn 2+ ) 时，电池反应达到平衡。
B.
C.
当 Cu 2+ ， Zn 2+ 均处于标准态时，电池反应达到平衡。
D.
当原电池的电动势为 0 时，电池反应达到平衡。
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