实行民族区域自治前提和基础是领土完整和国家统一，核心是自治权。（）
参考答案：对
根据首字母提示完成单词 。
1. Dave has worked for 6 hours, so now he is very s .
2. The o day, he bought a present for me.
3. They aren't s enough at that age.
4. He often s___ up reading until midnight.
5. Do you like your school u____?
某项目的净现金流量如表2—2所示，其投资回收期为（）年。
表2-2净现金流量表单位：万元
A.2.5
B.2.4
C.2.3
D.1.83
