对比分析不同性质的变量数列之间的变异程度时,应使用()
A、全距
B、平均差
C、标准差
D、变异系数
参考答案:D
用括号内所给词的适当形式填空
1. The train arrived at _________ (exact) eight o'clock. It was neither earlier nor later.
2. I don't know how __________ (chat) on the Internet.
3. The doctor told my father to give up _________ (smoke).
4. His story kept us __________ (laugh) for a long time.
5. I used to_________ (study) by reading a lot.
6. The girl won the first price in the swimming competition. Her parents take _________ (proud) in her.
7. We can't help him. He can work out the problem by_________ (him).
8. The child was so_________ (terrify) that he couldn't say a word when he saw the large snake.
制定城乡规划必须严格执行国家政策,应当( ),坚持五个统筹,坚持节约和集约利用资源,保护生态环境,保护人文资源,尊重历史文化,坚持因地制宜确定城市发展目标与战略,促进城市全面协调可持续发展。
A.以科学发展观为指导,以构建社会主义和谐社会为基本目标B.以构建社会主义和谐社会为指导,以科学发展观为基本目标C.以科学发展观为指导,以坚持中国特色城镇化道路为基本目标D.以坚持中国特色城镇化道路为指导,以构建社会主义和谐社会为基本目标