甲乙两个同学共同做“验证牛顿第二定律”的实验,装置如图所示。 ①两位同学用砝码

题型:实验题

问题:

甲乙两个同学共同做“验证牛顿第二定律”的实验,装置如图所示。

①两位同学用砝码盘(连同砝码)的重力作为小车(对象)受到的合外力,需要平衡桌面的摩擦力对小车运动的影响。他们将长木板的一端适当垫高,在不挂砝码盘的情况下,小车能够自由地做____________运动。另外,还应满足砝码盘(连同砝码)的质量m             小车的质量M。(填“远小于”、“远大于”或“近似等于”)

接下来,甲同学研究:在保持小车的质量不变的条件下,其加速度与其受到的牵引力的关系;乙同学研究:在保持受到的牵引力不变的条件下,小车的加速度与其质量的关系。

②甲同学通过对小车所牵引纸带的测量,就能得出小车的加速度a。图2是某次实验所打出的一条纸带,在纸带上标出了5个计数点,在相邻的两个计数点之间还有4个点未标出,图中数据的单位是cm。

实验中使用的电源是频率f=50Hz的交变电流。根据以上数据,可以算出小车的加速度a=        m/s2。(结果保留三位有效数字)

③乙同学通过给小车增加砝码来改变小车的质量M,得到小车的加速度a与质量M的数据,画出a~图线后,发现:当较大时,图线发生弯曲。于是,该同学后来又对实验方案进行了进一步地修正,避免了图线的末端发生弯曲的现象。那么,该同学的修正方案可能是(       )

A.改画a与的关系图线

B.改画a与的关系图线

C.改画 a与的关系图线

D.改画a与的关系图线

考点:实验:探究弹力与弹簧伸长的关系实验:探究小车速度随时间变化的规律实验:探究加速度与力、质量的关系实验:探究功与速度变化的关系
题型:实验题

阅读下面的古文,完成下面问题。

《范文正公文集》序

苏轼

  庆历三年,轼始总角入乡校,士有自京师来者,以鲁人石守道所作《庆历圣德诗》示乡先生。轼从旁窃观,则能诵习其辞,问先生以所颂十一人者何人也,先生曰:“童子何用知之?”轼曰:“此天人也耶,则不敢知;若亦人耳,何为其不可!”先生奇轼言,尽以告之,且曰:“韩、范、富、欧阳,此四人者,人杰也。”时虽未尽了,则已私识之矣。嘉祜二年,始举进士至京师,则范公殁。既葬,而墓碑出,读之至流涕,曰:“吾得其为人。”盖十有五年而不一见其面,岂非命也欤?

  是岁登第,始见于欧阳公,因公以识韩、富。皆以国士待轼,曰:“恨子不识范文正公。”

  呜呼,公之功德,盖不待文而显,其文亦不待序而传。然不敢辞者,自以八岁知敬爱公,今四十七年矣。彼三杰者,皆得从之游,而公独不识,以为平生之恨,若获挂名其文字中,以自托于门下士之末,非畴昔之愿也哉。

  古之君子,如伊尹、太公、管仲,乐毅之流,其王霸之略,皆素定于畎亩中,非仕而后学者也。淮阴侯见高帝于汉中,论刘、项长短,画取三秦,如指诸掌,及佐帝定天下,汉中之言,无一不酬者。诸葛孔明卧草庐中,与先主论曹操、孙权,规取刘璋,因蜀之资,以争天下,终身不易其言,此岂口传耳受尝试为之而侥幸其或成者哉?

  公在天圣中,居太夫人忧,则已有忧天下致太平之意,故为万言书以遗宰相,天下传诵。至用为将,擢为执政,考其平生所为,无出此书者。其于仁义礼乐,忠信孝弟,盖如饥渴之予饮食,欲须臾忘而不可得。如火之热,如水之湿,盖其天性有不得不然者。虽弄翰戏语,率然而作,必归于此。故天下信其诚,争师尊之。

  [注]韩、范、富、欧阳:韩琦,范仲淹、富弼、欧阳修,皆北宋名臣。

1.对下句子中加线的词的解释,不正确的一项是[ ]

A.子不识范文正公——恨:遗憾。

B.彼三杰者,皆得从之——游:交往。

C.汉中之言,无一不者——酬:报答。

D.其于仁义礼乐,忠信孝——弟:尊敬兄长。

2.下列句子中,全都直接表现苏轼对范仲淹景仰的一组是[ ]

①此天人也耶,则不敢知;若亦人耳,何为其不可!

②既葬,而墓碑出,读之至流涕,曰:“吾得其为人。”

③若获挂名其文字中,以自托于门下士之末,岂非畴昔之愿也哉。

④而公独不识,以为平生之恨。

⑤虽弄翰戏语,率然而作,必归于此。

⑥故天下信其诚,争师尊之。

A.①②⑥

B.②⑤⑥

C.③④⑤

D.②③④

3.下列对原文有关内容的分析和概括,不正确的一项是[ ]

A.苏轼小时候所听说的《庆历圣德诗》,颂扬了包括范仲淹在内的十一个人,所以苏轼对范仲淹仰慕已久,但一直没能见到他。

B.苏轼认为,范仲淹的功德,不需要文章来显扬,他的文章也不需要靠序言来传世,自己答应为其作序,是为了实现结识范仲淹的愿望。

C.苏轼举伊尹、太公,淮阴侯、诸葛孔明等人为例,是为了说明范仲淹就像他们一样,早就有辅佐人君称王称霸的抱负,并且一以贯之,终身不易。

D.这篇序言如叙家常,通过童年的记忆、考中进士后的结交逸事等的叙写,着力歌颂了范仲淹的功德,表达了自己对范仲淹的倾慕之情。

4.把文言文阅读材料中划横线的句子翻译成现代汉语。

(1)时虽未尽了,则已私识之矣。

 ______________________________________________________

(2)是岁登第,始见知于欧阳公,因公以识韩、富。

 ______________________________________________________

(3)则已有忧天下致太平之意,故为万言书以遗宰相。

 ______________________________________________________

题型:实验题

德弗勒互动过程模式

题型:实验题

人力资源规划的起点是()。

A.人员供给预测

B.组织目标与战略分析

C.人员需要预测

D.供需匹配

题型:实验题

下列的选项中讨论的是数据仓库的数据基本特征是 Ⅰ.数据仓库是面向主题的 Ⅱ.数据仓库的数据是集成的 Ⅲ.数据仓库的数据是相对稳定的 Ⅳ.数据仓库数据是反映历史变化的

A.Ⅰ和Ⅱ

B.Ⅰ,Ⅱ和Ⅲ

C.Ⅱ,Ⅲ和Ⅳ

D.全部

题型:实验题

(B)

An increase in students applying to study economics at university is being attributed to (归因于) the global economic crisis awakening a public thirst for knowledge about how the financial system works.

Applications for degree courses beginning this autumn were up by 15% this January, according to UCAS, the Universities and Colleges Admissions Service. A spokesman for the Royal Economic Society said applications to do economics at A-level were also up.

Professor John Beath, the president of the society and a leading lecturer at St Andrews University, said his first –year lectures—which are open to students from all departments—were drawing crowds of 400, rather than the usual 250.

“There are a large number of students who are not economics majors, who would like to learn something about it. One of the things I have done this year is to relate my teaching to contemporary events in a way that one hasn’t traditionally done,” he added.

University applications rose 7% last year. But there were rises above average in several subjects. Nursing saw a 15% jump, with people’s renewed interest in careers in the public sector(部门),which are seen as more secure in economic crisis.

A recent study showed almost two thirds of parents believed schools should do more to teach pupils about financial matters, and almost half said their children had asked them what was going on, although a minority of parents felt they did not understand it themselves well enough to explain.

Zack Hocking, the head of Child Trust Funds, said: “It’s possible that one good thing to arise from the downturn will be a generation that’s financially wiser and better equipped to manage their money through times of economic uncertainty.”

50.Professor John Beath’s lectures are_____.

A.given in a traditional way    B. connected with the present situation

C.open to both students and their parents D.warmly received by economists

51.Careers in the public sector are more attractive because of their_____.

A. greater stability B.higher pay C.fewer applications D.better reputation

52.According to Hocking, the global economic crisis might make the youngsters_____

A. wiser in money management   B.have access to better equipment

C.confident about their future careers   D.get jobs in Child Trust Funds

53.What’s the main idea of the text?

A.Universities have received more applications.

B. Economics is attracting an increasing number of students.

College students benefit a lot from economic uncertainty.

Parents are concerned with children’s subject selection.

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