题干

如图所示,一个铁球从竖直在地面上的轻质弹簧的正上方某处自由落下,接触弹簧后将弹簧弹性压缩,从它接触弹簧开始到弹簧压缩到最短的过程中,小球的速度和受到的合外力的变化情况是(       )

A:合力变小,速度变小

B:合力变小,速度变大

C:合力先变小后变大,速度先变小后变大

D:合力先变小后变大,速度先变大后变小

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答案(点此获取答案解析)

D

同类题2

阅读下面的短文,根据短文内容及首字母提示,在短文空白处填入一个恰当的词,使短文内容完整、通顺,并将所填单词填写在答题卡上相应的题号后。

    I packed, and was ready to leave for my two-day trip. I had been busy with my work. I had made p____ for the trip for the last few days, and I expected to get r____ for several days. As I got into the car to leave, my mind flew to my kids.

    How to keep in touch with your kids when you're busy or far away is a dilemma(两难的问题) many fathers have. Men like to focus special attention on one thing for a long p____, but this can lead to trouble. Moving from work to family isn't always an easy thing. And if you don't s____ your kids that you're thinking about them, they may think that you don't care.

    As I started down the road, I suddenly stopped to t____ back to my house and wrote a short message on a c____ of cards to each of my children. I put each in a “secret” place where I knew they'd find it. When I called the next night, they both said e____, “Daddy, I got your card. When did you do that?”

    I was moved when I heard these words. What I had never thought was that a small thing had a big influence on my kids. It proved(证明) that they were in my heart. And distance (距离) couldn't s____ them from their father. To my satisfaction, they feel “love” of their father. This v____ experience encouraged me to continue to do the small things to be a responsible father.

    As fathers get much busier and have to work longer hours, they usually pay l____ attention to the small things. Don't miss the good chances to let your kids see how important they are.

    Take a moment to do a small thing for your kids. It won't s____ small to them.

同类题3

阅读材料,完成下列要求。

材料一:春秋战国时的竞争环境,强化了人们对各自国家的认同。秦统一中国使一统天下的国家观获得政治上的实现。到了西汉,“大一统”的国家观念更进一步地被意识形态化。自汉魏之际开始,对国家忠诚被凸显出来,唐平定安史之乱过程中的很多例证,也证明了这一点。两宋士人基本达成一种道德共识:凡沾旧国一命之恩者,不应再改仕新朝。面对金兵的南下,华北民间自发组织的“民兵”、“忠义军”等抗金武装表现突出。清代在修撰《明史》时也专设《贰臣传》以待明朝降臣,这可看作是加强国家认同的一种举措。

——摘编自姚大力《中国历史上的民族关系与国家认同》

材料二:1894年,孙中山成立兴中会,提出“驱除鞑虏,恢复中国,创立合众政府”。后来,同盟会在政纲中又阐述了排满革命、推翻帝制、建立共和之间的逻辑。辛亥革命后,孙中山在就任临时大总统的誓词中庄严宣示:“国家之本在于人民,合汉、满、蒙、回、藏诸地为一国,即合汉、满、蒙、回、藏诸族为一人,是曰民族之统一。”随后,在清帝退位诏书中也承认:“外观大势,内审舆情,特率皇帝,将统治权公诸全国,定位共和立宪国体”。这表达出满洲人对新国家的认同。

——据《中华民国临时大总统宣言》、《清帝退位诏》等

根据材料一,二并结合所学知识,指出与传统国家观相比,近代资产阶级革命派的国家观有何发展,并对其予以简要评价。