己内酰胺萃取塔清洗时应加入NaOH，并启动转盘进行清洗。
参考答案：对
I live in a faraway village, and only go to visit my parents ______.
A．anxiously
B．immediately
C．occasionally
D．practically
混凝气浮法与混凝沉淀法不同点是（）
A.混凝反应
B.固液分离
C.排泥渣
D.渣含有大量的微气泡
