Is this the factory ______ my father visited last year.

A．what

B．the one

C．where

D．that

当混凝剂在水中电离、水解后，以悬浮物为凝絮的核心，形成絮状沉淀物，称其为（）作用。

A.中和

B.表面接触

C.吸附

D.网捕