2×3读作____,表示____个____相加,还表示____个____相加。
如图所示,在杯底放一枚硬币,把杯移到眼睛刚好看不到的地方,保持眼睛和杯的位置不变,请一位同学向杯中缓慢加水,将会重新观察到硬币,产生这种现象的原因是 ____ 。
普查时间
比较项目
1964年
2008年
2010年
60岁以上
5.5%
6.96%
13.26%
15-59岁
54.1%
70.15%
70.14%
0-14岁
40.4%
22.89%
16.60%
①缓解我国人口日益老龄化的趋势 ②为未来经济社会发展提供必要的劳动力
③完善人口结构,提高人口素质 ④控制人口增长,减轻对资源、环境的压力
Hello! I'm an American girl. My first name is Lucy. My last name is White. I'm in No.12 Middle School. My father and mother are in No.12 Middle School, too. They are English teachers. My brother is in Nankai University(大学). His name is Tony. I have a Chinese teacher. Her name is Wang Yan. She can speak (说)very good English. She is a good teacher.