生物除磷工艺中以下列哪种方式去除磷（）。A、充氧 B、反硝化 C、排出剩余污泥 D、 发布时间：2017-06-06 02:15 │ 来源：www.tikuol.com 题型：单项选择题 问题： 生物除磷工艺中以下列哪种方式去除磷（）。A、充氧B、反硝化C、排出剩余污泥D、投加药剂
题型：单项选择题 完形填空。 What is the population of China? There are more than 1.3 billion people in China. It is 1 one fifth of the world's population. How to control the population growth is a big problem. Some people think it's 2 to control the population growth. But I don't quite agree 3 them because where there is a will, there is a way. The question is how we could 4 it known to everyone how serious the population problems are. Our farmland is becoming less and less to everyone. We have already got too many mouths to feed. 5 we control the population growth, many people will die 6 hunger. Too fast population growth will be bad for our nation. Though laws have been passed to control the population growth, in some places 7 is done to carry out the laws. We should make people 8 that it is foolish of them to give birth to too many children. They should no longer do what they have been doing for many years. We are fighting 9 too fast population growth. Yet the fighting won't end 10 everyone knows its importance and does something for it. ( )1. A. most ( )2. A. possible( )3. A. to ( )4. A. let ( )5. A. If not ( )6. A. of ( )7. A. many ( )8. A. to know ( )9. A. for ( )10. A. until B. almost B. necessary B. for B. make B. Unless B. about B. little B. to learn B. against B. after C. highly C. impossible C. with C. have C. Until C. in C. a lot C. know C. to C. when D. hardly D. unnecessary D. on D. bring D. If D. out of D. much D. learning D. about D. as 查看答案