对于醋酸的电离平衡<img src="https://nimg.ppkao.com/2018-09/tangxueping/2018091109464341780.jpg?sign=f922778ca5a0eb417158b9b7857fd37d&t=62d4dc9a" />,其电离平衡常数可表示为()。<br /> <img src="https://nimg.ppkao.com/2018-09/tangxueping/201809110947009595.jpg?sign=2a41f10d61381a625f0cc32d173bc430&t=62d4dc9a" />
A、A
B、B
C、C
D、D