向污水投加混凝剂，是利用混凝剂的（）或与水中某些物质反应生成_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

向污水投加混凝剂，是利用混凝剂的（）或与水中某些物质反应生成具有吸附乳化油粒和机械杂质的物质的原理。

A.自身氧化

B.自身还原

C.自身分解

D.自身水解

答案

参考答案：D

补全对话，情景问答

给下列的问句选择对应的答语。

( ) 1. Happy Children's Day!
( ) 2. How many crayons do you have?
( ) 3. Where is my car?
( ) 4. Can I have some apples, please?
( ) 5. Where are you from?

A. I have 16.
B. Certainly.
C. I'm from America.
D. It's on your desk.
E. Thank you.

选择题

—When do you go to school?

—______ 8:00 ______ the morning. [ ]

A. At, on

B. In, in

C. At, at

D. At, in