污水处理中生化处理阶段一般设有()
A.曝气池
B.二次沉淀池
C.包含A和B
D.不包含A和B
参考答案:C
---English has a large vocabulary, doesn’t it?
Yes. more words and expressions and you will find it easier to read and communicate.
A.With
B.Knowing
C.To know
D./
用于增加对象功能的设计模式是(1);用于限制对象访问的设计模式是(2)。
空白(2)处应选择()
A.Adapter
B.Decorator
C.Delegation
D.Proxy