探究一：探究氰化物的性质

已知部分弱酸的电离平衡常数如下表：

阅读理解

      There are many festivals (节日) in our school. This month is October. In October, there is a Sports Festival. We have a basketball game and a volleyball game during (在....之间) the festival. In the middle of this month, we have an English test during the English Festival. October the nineteenth is the day for a school trip; we go to Beijing with the teachers. On the last day of this month, there is a Music Festival. On that day we can enjoy beautiful songs, dances and piano music. It is really wonderful. Next month, there is an Art Festival. Students often display(展示) their pictures on that day.

高大山脉往往是地形区的分界，如太行山脉东西两侧就分别是