用如图的简易净水器处理河水，下面对该净水器分析正确的是（   ）

阅读理解,判断对错。

Tom：Excuse me，how do I get to the Ping'an Park ?

Woman: 1. go, you, can, by, there, bus . Or you can go on foot.

Tom: 2. How do I go there on foot ?

Woman: It's easy. Turn left at the traffic lights. 3.公园挨着一个博物馆。

Tom: Thank you very much. Hurry up, Zhang Peng!

Woman: No! The light is red. Stop!

Tom: That's right. We have to wait.

设a＞0，将$\frac{a^2}{\sqrt{a·\sqrt[3]{a^2}}}$表示成分数指数幂，其结果是（　　）