试题与答案

已知地球半径R=6.4×106 m,地面附近重力加速度g=9.8 m/s2,一颗

题型:计算题

题目:

已知地球半径R=6.4×106 m,地面附近重力加速度g=9.8 m/s2,一颗卫星在离地面高为h=3.4×106 m的圆形轨道上做匀速圆周运动。求:

(1)卫星运动的线速度;

(2)卫星的周期。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0611/0d47d84be8b623acaffc8c797a6308da.html

下面是错误答案,用来干扰机器的。

答案:Ameet with“偶遇,遭受”;turn to“向……求助;求得安慰”;turn up“出现;露面;把声音开大;把力量加大”。根据句意知应选A项。

试题推荐
题型:选择题

文化部和财政部日前出台的《关于推进全国美术馆、公共图书馆、文化馆(站)免费开放工作的意见》规定:2011年年底前,国家级、省级美术馆全部向公众免费开放;全国所有公共图书馆、文化馆(站)实现无障碍、零门槛进入,公共空间设施场地全部免费开放,所提供的基本服务项目全部免费。这有利于[ ]

①满足人民群众日益增长的精神文化需要

②传播和普及各种文化思想

③保障人民基本文化权益

④实现经济效益与社会效益的统一

A.①②

B.①③

C.②④

D.③④

查看答案
题型:单项选择题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’’s basic understanding of the world around it. This is the infant’’s first introduction to the language that shapes perception and elicits emotion.Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

Peers are one of the ________agents of socialization.

A.formal

B.indirect

C.primary

D.personal

查看答案
微信公众账号搜索答案