题干

若不考虑空气阻力,如图是表示足球在空中飞行的受力图,正确的是(G表示重力,F表示脚对球的作用力)(  )

A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2018-04-21 09:49:05

答案(点此获取答案解析)

B

同类题1

文物作为人类活动的遗存,承载着重要的历史信息。阅读下列材料:

材料一  三星堆共出土了1720件珍贵文物。按其功能分类,我们可将它们分为:祭祀品,共105件,主要是青铜器,其中较大型的樽和罍,其功能可能有两个方面,主要用于祭祀天神、地神和祖先,同时也可当作生活用品,比如装酒、粮食等;生产工具,共124件,主要是石器和玉石,其中有斧、凿、錾、刀等;兵器,共127件,主要是青铜器,还有石器和玉器,其中有青铜戈、玉戈、玉刀;生活与装饰,这方面数量最多,共1364件,其中有青铜器、金器、玉器、石器、陶器、骨器、象牙器,以玉器为主,占615件。除上述四种类型外,还有80根大象牙,……另外,还有当时的货币——铜贝4662枚。还有数以吨计的陶片未计算在内。

                                        ——摘自冯学敏等《点击三星堆》

材料二  举世瞩目的三星堆考古发现,向我们揭示了三千多年前古蜀王国绚丽多彩的社会生活情形,展现了一个湮没的内陆农业文明的辉煌。……三星堆考古发现提供的不仅仅是珍贵的资料,更重要的是将使学术界重新审视中华文明,世界文明发展史上将因之而谱写新的灿烂篇章。  

                                        ——黄剑华《古蜀的辉煌》

请回答:

同类题4

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Having a clean and organized workspace takes time and effort—especially if we want to keep it that way. ____ According to recent statistics, the average office employee spends one and a half hours a day looking for things. That's an hour and a half that is wasted every day because of disorganization. Keeping things organized can give you more time each day. Having a clean workspace can have a number of additional surprising benefits. Let's look at some of those now.

____

    Untidiness can be a distraction that interferes with your thought process and prevents you from being as effective as you can be. When your workspace is clean and organized, you can spend more time focused on your tasks, without the unorganized chaos to attend to.

Attain More Success

    It's hard to be productive when you're disorganized. Organization can make it easier to concentrate, and allows you to get things done faster. Whether you're an employee or self­employed, organization is a crucial component for success. If clients see that you're well­ organized, they'll be more willing to trust you.____

Make a Better Impression

    In addition to making it easier to focus and work, having a clean workspace also helps to convey a professional image. Your workspace says more about you than you may think. When someone walks past your space, they instantly form an opinion about you based on what your space looks like.____ However, to the outsider, you may look overwhelmed and incapable of taking on extra projects.

Have a Happier Work Experience

    If you're surrounded by a clean environment you'll have space to think, will be able to get more done and will feel better working in that space.

Fortunately, keeping your space clean and organized is easier than you might think.____ You'll be amazed at the difference a clean workspace can make to your mindset and how much more you'll be able to accomplish during the day.

A. Improve Focus

B. Regain Tidiness

C. But the results are more than worth it

D. Maybe you feel productive with papers scattered around

E. It shows that you know what you're doing and that you are capable

F. Clearly being disorganized can have a negative effect on your performance

G. Try to get rid of or throw away everything that you don't need to maximize your productivity

同类题5

阅读两段文言文,完成小题。
      【甲】先帝创业未半而中道崩殂,今天下三分,益州疲弊,此诚危急存亡之秋也。然侍卫之臣不懈于内,忠志之士忘身于外者,盖追先帝之殊遇,欲报之于陛下也。诚宜开张圣听,以光先帝遗德,恢弘志士之气,不宜妄自菲薄,引喻失义,以塞忠谏之路也。
        宫中府中,俱为一体,陟罚臧否,不宜异同。若有作奸犯科及为忠善者,宜付有司论其刑赏,以昭陛下平明之理,不宜偏私,使内外异法也。
        侍中侍郎郭攸之、费祎、董允等,此皆良实,志虑忠纯,是以先帝简拔以遗陛下。愚以为宫中之事,事无大小,悉以咨之,然后施行,必能裨补阙漏,有所广益。
        将军向宠,性行淑均,晓畅军事,试用于昔日,先帝称之曰能,是以众议举宠为督。愚以为营中之事,悉以咨之,必能使行阵和睦,优劣得所。
亲贤臣,远小人,此先汉所以兴隆也;亲小人,远贤臣,此后汉所以倾颓也。先帝在时,每与臣论此事,未尝不叹息痛恨于桓、灵也。侍中、尚书、长史、参军,此悉贞良死节之臣,愿陛下亲之信之,则汉室之隆,可计日而待也。               

                                                                                                                                                       (节选自诸葛亮《出师表》)
       【乙】诸葛亮之为相国也,抚百姓,示仪轨,约官职,从权制,开诚心,布公道;尽忠益时者虽仇必赏,犯法怠慢者虽亲必罚,服罪输情者虽重必释,游辞巧饰者虽轻必戮;善无微而不赏,恶无纤而不贬;庶事精炼,物理其本,循名责实,虚伪不齿;终于邦域之内,咸畏而爱之,刑政虽峻而无怨者,以其用心平而劝戒明也。可谓识治之良才,管、萧之亚匹矣。然连年动众,未能成功,盖应变将略,非其所长欤!”         

                                                                                                                                                  (节选自陈寿《三国志·诸葛亮传》)
【注释】①仪轨:礼仪法度。②约:省减,简约。③权制:合乎时宜的制度。④服罪输情:认罪并表示悔改。⑤物:指人,百姓。⑥亚匹:同一流人物。亚:同类。