要使气浮过程有效地去除废水中污染物,必须具备的条件是()
A、有足够的溶解空气量、形成微小气泡
B、废水中有疏水性污染物
C、有足够的停留时间
D、被去除污染物比水重
参考答案:A
____________ you may have, you should gather your courage to face the challenge.
A.However a serious problem
B.What a serious problem
C.However serious a problem
D.What serious a problem
反义词对举