题干

一只老鹰在水平面内盘旋做匀速圆周运动,则关于老鹰受力的说法正确的是(  )

A:老鹰受重力、空气对它的作用力和向心力的作用

B:老鹰受重力和空气对它的作用力

C:老鹰受重力和向心力的作用

D:老鹰受空气对它的作用力和向心力的作用

上一题 下一题 0.0难度 选择题 更新时间:2018-11-08 04:15:23

答案(点此获取答案解析)

B

同类题1

阅读配对。左边是关于五个人兴趣爱好的介绍,请在右边选择符合这五个人兴趣的广告,把字母编号填在题号前的括号里。

____Katrina is a quiet girl. She hardly does any sports in her free time. But she enjoys music very much.

____Allan likes sports very much. He likes to try all kinds of exciting(刺激的) sports.

____Dick likes water sports very much. He usually spends his summer holiday by the sea.

____Judy is a movie fan. She goes to the movies twice a week.

____Nancy is a housewife. She goes shopping every day. She likes to buy the best things with the least money.

A. The long silver beach has the greatest waves (海浪) and beautiful sand. It's good for surfing lovers.

B. Special Party: Lovers of extreme(极限)sports get together to enjoys the fun of skateboarding and rocks climbing. 

C. Special Price Day: Come to the Wal-Mart(沃尔玛) and have a look. We are sure you can find the best in your heart without worrying about the money.

D. The first undersea aquarium of the country. You can see many beautiful and strange fish living in the deep sea.

E. Harry Porter (TV) is out now. Get it in the Center Bookshop at once. The first 10 buyers can get a small present from the shop. 

F. Do you believe that a beautiful girl will love a chimp(黑猩猩)? Enjoy “King Kong” this Friday evening. The cinema will offer a cup of tea to every audiences(观众).

G. Living with Michael Jacksons: The program shows the lifestyles of the super singing star. Monday night, 21:00. Channel 2.

同类题4

阅读下列材料,回答问题:

材料一:在世界各民族中,英国算得上是一个典型,它体现着一种独特的发展方式——英国发展方式。这种方式以和缓、平稳、渐进为主要特色,即使对世界事务不甚了解的人也会有一种模糊的印象,即英国是一个稳重的民族,它注重实际而不耽于空想,长于宽容而不爱走极端,……但正是这个不爱走极端的稳重的民族为现代世界(至少是西方世界)奠定了好几块基石。

——钱乘旦、陈晓律《在传统与变革之间——英国文化模式溯源》

材料二:19世纪晚期以来,英国奉行对欧洲大陆事务不干预政策。

1948年,英国提出“三环外交”构想,将英联邦、美国和联合起来的欧洲作为英国外交的重要三环,以维护英国的传统利益和大国地位。

1957年,欧洲经济共同体诞生。1959年,英国与奥地利等六国签订“欧洲自由贸易联盟”条约,对抗欧洲一体化进程。

60年代,英国两次申请加入欧共体,遭到拒绝。直到1973年英国正式加入欧共体。

1973年第一次石油危机,欧洲大陆经济遭受重创,英国经济也受到严重拖累。1975年英国就留欧举行公投,终67.2%的民众选择留欧。

2009年,欧债危机爆发,英疑欧力量再度上升。2013年1月,英国首相卡梅伦就英国与欧盟关系前景发表讲话,表达了英国对遭到欧债危机拖累的不满,以及对欧洲一体化进程可能损害英国利益的担忧。2016年6月,英国脱欧公投结果显示,51.89%的英国公民选择脱离欧盟。

——摘编自《人民日报》,2016年6月25日,《英国与欧盟的那些事》