阅读短文，判断下列句子与短文是否相符。

    John: I like my hometown. It is a small village. There are many rivers and bridges there. The water is clean. The air is fresh.

    Mike: I like my hometown, too. There are many mountains near my village. There are no tall buildings. The sky is blue. The clouds are white. I can run on the grass.

    John: Are there any pandas in the mountains?

    Mike: No, there aren't. Are there any fish in the rivers?

    John: Yes, there are. You can see many fish.

I.NH₄⁺含量的测定

采用蒸馏法，蒸馏装置如图所示.

相关的实验步骤如下：

①准确称取58.80g晶体X，加水溶解后，将溶液注入圆底烧瓶中；

②准确量取50.00mL  3.0300mol•L^-1H₂SO₄溶液于锥形瓶中；

③向三颈烧瓶中加入足量NaOH溶液，加热蒸馏；

④用0.120mo l•L^-1 NaOH标准溶液滴定锥形瓶中过量的硫酸，滴定终点时消耗25.00mL NaOH标准溶．

计算：（$\frac{1}{2}$y﹣x）²=　____ ．