将一个自然数旋转180°后，可以发现一个有趣的现象，有的自然数旋转后还是自然数．

发布时间：2017-04-27 12:14 │ 来源：www.tikuol.com

题型：填空题

问题：

将一个自然数旋转180°后，可以发现一个有趣的现象，有的自然数旋转后还是自然数．例如，808，旋转180°后仍是808．又如169旋转180°后是691．而有的旋转180°后就不是自然数了，如37．试写一个五位数，使旋转180°后仍等于本身的五位数______．（数字不得完全相同）

考点：图形旋转

题型：填空题

根据我国体力劳动强度分级标准，依据下列哪项划分劳动强度的大小（）

A．心率

B．氧需

C．劳动强度指数

D．劳动工时

E．劳动时的能量代谢

查看答案

题型：填空题

在配窗玻璃时，要用分度值是______的刻度尺；在测量跑道长度时，应选用分度值是______的卷尺．

查看答案

题型：填空题

     Educating girls quite possibly gets a higher rate of reward than any other investment (投资) available
in the developing world. Women's education may be an unusual field for economists (经济学家), but
increasing women's contribution to development is actually as much an economic as a social issue. And
economics, with its focus on encouragement, provides all explanation for why so many girls fail to receive
an education.
     Parents in low-income countries don't invest willingly in their daughters because they do not expect
them to make an economic contribution to the family: girls grow up only to marry into somebody else's
family and bear children. Girls are thus seen as less valuable than boys and usually have to stay at home
to do housework while their brothers are sent to school.
     An educated mother, on the other hand, has greater earning abilities outside the home and faces an
entirely different set of choices. She is likely to have fewer but healthier children and can insist on
developing all her children, ensuring that her daughters are given a fair chance. The education of her
daughters then makes it much more likely that the next generation of girls, as well as of boys, will be
educated and healthy.
     Few will argue that educating women has great social benefits. But it has huge economic advantages
as well. Most obviously, there is the direct effect of education on the wages of female workers. Wages
rise by 10 to 20 percent for each additional year of schooling. Such big returns are impressive by the
standard of other available investments, but they are just the beginning. Educating women also has a
significant influence on health practices, including family planning.

Topic	The significance of female 1. ____ in developing countries
Viewpoint	Educating girls 2. __ __ a family more than any other investment.
3. __ __ in different families	◆ Girls are of less 4. _ _ than boys. ◆ Girls and boys should have 5. __ __ chances. ◆ 6. ___ _ should be for all children.
practice in low -income countries	◆ Parents are 7.__ to invest in daughters. ◆ Girls are 8. __ __ to stay at home to do" housework.
Significance	Educating girls 9. __ __ to .social benefits, economic advantages and health practices, including family planning.
10. ____	Educating girls in developing countries is important and rewarding.

查看答案

题型：填空题

对膳食纤维的叙述不正确的是（）

A.膳食纤维是一种多糖

B.膳食纤维是指植物中不能被消化吸收的成分

C.不溶性纤维主要有纤维素、半纤维素和木质素

D.膳食纤维根据水溶性分为可溶性纤维和不溶性纤维

E.可溶性纤维主要有果胶

查看答案

题型：填空题

以下不属于独立人格体现的是（）。

A.独立的个体

B.独立的信息

C.独立的判断

D.独立的意识

查看答案

更多题库