质量相等的A、B两物体(均可视为质点)放在同一水平面上,分别受到水平恒力F1、F

题型:选择题

问题:

质量相等的A、B两物体(均可视为质点)放在同一水平面上,分别受到水平恒力F1、F2的作用,同时由静止开始从同一位置出发沿同一直线做匀加速运动.经过时间 t0和 4t0速度分别达到2v0和v0时分别撤去F1和F2,以后物体继续做匀减速运动直至停止.两物体速度随时间变化的图线如图所示.对于上述过程下列说法中正确的是(  )

A.F1和F2的大小之比为8:1

B.A、B的位移大小之比为2:1

C.在2t0和3t0间的某一时刻B追上A

D.F1和F2的冲量大小之比为3:5

考点:匀变速直线运动牛顿第二定律动量定理
题型:选择题

俗话说:“善意的谎言不为欺骗。”这是指 (   )           

A.善意的谎言并不违背诚实的道德标准

B.对亲人所说的谎言可以不看成是欺骗

C.只要心存善意,就可以说谎话

D.不论什么样的谎言都不具备欺骗性

题型:选择题

MySpace, the social networking website, is different from other websites which only provide stories about other people. MySpace is a place that allows you to broadcast your own stories and personal information to as many people as you like. Started two years ago, it is a big source of information for and about American kids.

Teenagers and their parents feel very differently about it. Teens are rushing to join the site, not sharing their parents' worries. It signals yet another generation gap in the digital era.(数字时代)

For teenagers, it is reliable network to keep in touch with their friends. They will often list their surnames, birthdays, after­school jobs, school clubs, hobbies and other personal information.

“MySpace is an easy way to reach just about everyone. I don't have all the phone numbers of all my acquaintances (熟人). But if I want to get in touch with one of them, I could just leave them a message on MySpace.” said Abby Van Wassen. She is a sixteen ­year­ old student at Woodland Hills High of Pittsburgh, Pennsylvania.

Parents on the other hand are seriously concerned about the security problems of MySpace.

“Every time we hold a parents meeting, the first question is always about MySpace,” said Kent Gates, who travels the country doing Internet safety seminars (研讨会).The National Center for Missing and Exploited Children has received at least 288 MySpace­ related complaints, according to Mary Beth Buchanan, a lawyer in Pittsburgh.

“Your profile on MySpace shows all your personal information to anyone on the Web. And MySpace even lists this information by birthplace and age. It's like a free checklist(清单)for troublemakers and it endangers children,” Buchanan said.

小题1:From the passage we can learn that MySpace ________.

A.brings about the generation gap

B.is very careful about people's privacy

C.encourages you to list your personal information

D.lists the telephone numbers of your friends小题2:Why are some parents against MySpace?

A.Because MySpace has a bad influence on their children.

B.Because they don't want to pay so much money for MySpace.

C.Because it takes up too much of their children's spare time.

D.Because troublemakers can easily approach their children through the site.小题3:The writer's attitude towards MySpace is ________.

A.negative

B.positive

C.optimistic

D.objective小题4:Which of the following can be the best title of the passage?

A.Internet safety

B.MySpace

C.Generation gap

D.The digital era

题型:选择题

医院伦理委员会功能哪项除外()。

A.政策研究功能

B.咨询服务功能

C.教育培训功能

D.审查监督功能

E.代理功能

题型:选择题

适合于预期未来收入减少或者希望减少利息支出的借款人的还款方式为()

A、比递减还款法

B、等比递增还款法

C、等额递减还款法

D、等额递增还款法

题型:选择题

关于行政诉讼案件的管辖,下列说法错误的是()。

A.对限制人身自由的行政强制措施不服提起的诉讼,由被告所在地或者原告所在地人民法院管辖

B.因不动产提起的行政诉讼,由不动产所在地人民法院管辖

C.人民法院对管辖权发生争议,由争议双方协商解决。协商不成的,报它们的共同上级人民法院指定管辖

D.受移送的人民法院认为案件不属于自己管辖时,应当移送有管辖权的人民法院

更多题库