如图所示,将铁棒和石墨棒插入1 L 1 mol·L-1食盐水中。下列说法正确的是（ ）
| A．若电键K与N连接,铁被保护不会腐蚀 |
| B．若电键K与N连接,正极反应式是:4OH--4e-=2H2O+O2↑ |
| C．若电键K与M连接,将石墨棒换成铜棒,可实现铁棒上镀铜 |
| D．若电键K与M连接,当两极共产生28 L(标准状况)气体时,生成了1 mol NaOH |
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