常委会听取和审议专项报告，“一府两院”应当在常委会举行会议的二十日前，将专项工作报告

你能根据句意和首字母准确地写出句中所缺的单词吗?

1. Be careful, or you'll cut your f_____.

2. You must improve your s_____.

3. We didn't have c_____ in ourselves.

4. The boy always does his homework all by h_____.

5. There are two girls. B_____ of them are students.

6. Yesterday they b_____ the dictionary in the bookstore.

7. Don't write them down on a p_____ of paper.

8. There is a big tree in f_____ of our classroom.

9. These words were s_____ wrong.

10. Let's draw a big c_____ on the blackboard.

一般空调系统中的冷冻水系统是（）

A.闭式系统

B.开式系统

C.介于闭式和开式之间的系统

D.既非开式也非闭式的系统

国家考核电力企业供电部门以什么作为主要经济指标？

在一定的空间范围内各生物成分和非生物成分，通过能量流动和物质循环而相互作用、相互依存所形成的一个功能单位称之为（）

A.生物系统

B.生态系统

C.生境系统

喷射混凝土在初期支护中的作用？