【单选题】
三块互相平行的导体板，相互之间的距离d<sub>1</sub>和d<sub>2</sub>，且比板面积线度小得多，外面二板用导线连接。中间板上带电，设左右两面上电荷面密度分别为<img src="https://nimg.ppkao.com/2019-04/wuacheng/201904301600464546.jpg?sign=4a73b2fe453be0a9b27bbe477a755425&t=62d729b4"/>如图所示，则比值<img src="https://nimg.ppkao.com/2019-04/wuacheng/2019043016012562772.jpg?sign=c8f1f88ec9dd029748199a60f49abba5&t=62d729b4"/>（）<br/> <img src="https://nimg.ppkao.com/2019-04/wuacheng/2019043016013821367.jpg?sign=d1f3e37020d10f753aa5c71bb366328f&t=62d729b4"/><br/> <img src="https://nimg.ppkao.com/2019-04/wuacheng/2019043016014653281.jpg?sign=54f8d208b4b2a2317c73aeb94de4a3ed&t=62d729b4"/>
A、A
B、B
C、C
D、D
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