.筛板塔、泡罩塔、浮阀塔相比较，操作弹性最大的是  ；单板压力降最小的是  ；造价最便宜的是  。

A、<span style=";font-family:&#39;Times New Roman&#39;;font-size:16px"><span style="font-family:宋体">筛板塔</span></span><span style=";font-family:宋体;font-size:16px">；</span></p><p></p>

B、<span style=";font-family:&#39;Times New Roman&#39;;font-size:16px"><span style="font-family:宋体">浮阀塔</span></span><span style=";font-family:宋体;font-size:16px">；</span><span style=";font-family:&#39;Times New Roman&#39;;font-size:16px">&nbsp;</span></p><p></p>

C、<span style=";font-family:&#39;Times New Roman&#39;;font-size:16px"><span style="font-family:宋体">泡罩塔。</span></span></p><p></p>