如图所示,在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场,一个不计重力

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问题:

如图所示,在x轴上方存在着垂直于纸面向里、磁感应强度为B的匀强磁场,一个不计重力的带电粒子从坐标原点O处以速度v进入磁场,粒子进人磁场时的速度方向垂直于磁场且与x轴正方向成120°角,若粒子穿过y轴正半轴后在磁场中到x轴的最大距离为a,则该粒子的比荷和所带电荷的正负是(  )

A.,正电荷

B.,正电荷

C.,负电荷

D.,负电荷

考点:带电粒子在匀强磁场中的运动
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门户首页包含10个版块,顺序依次为:门户导航区、热点区、搜索模块、新闻资讯区、精品业务区、()、()、精品业务区、补充推广区、本地风采及服务区。

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在Rt△ABC中,∠C=90°,a=5,c=13,则sinA=______.

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下列有关增值税政策规定正确的有()。

A.一般纳税人销售自己使用过的除固定资产以外的物品,应当按照适用税率征收增值税

B.小规模纳税人销售自己使用过的除固定资产以外的物品,应按3%的征收率征收增值税

C.纳税人销售旧货,按照简易办法依照4%征收率减半征收增值税

D.个体工商户,销售自己使用过的固定资产,减按2%征收率征收增值税

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Part 3


Questions 19-25


·Read the following article and answer questions 19-25.
·For questions 19-25, choose the correct answer A, B, C or D.

The Haunted America


Countries are like little homes; they house a nation, hold ideologies and provide shelter and comfort to its people in hopes that the occupants will nurture better ideas for themselves and further flourish humanity. Such are primary desires and goals of most countries on this small planet.
America is no exception. For decades, billions of people around the world slept at night on empty stomachs amidst dreadful circumstances, often dreaming of the freedoms and liberties of America, which they likened to a great land, a paradise and a final destination point.
The best and brightest of the world gravitated to the great USA in search of golden opportunities; in hordes they came, and en masse they settled. America became the nation which acknowledged greatness and provided the driving force to allow the dreams of small, ordinary people to take form and flourish. Free from restrictions, allowing grand expressions with extraordinary liberties, that no other nation in the history of mankind has been able to match at such a grand scale.
But currently, it seems that this home of the American nation has started to resemble that old mansion, elegantly pristine (质朴的) but known to be haunted, sitting at the end of that dead-end street where ghosts, mysterious apparitions (幽灵) and unexplainable signs have emerged. This planet, like an old street, is already full of such haunted houses, which at times seem abandoned, lifeless and unable to give or receive neighborly warmth; factors so critical for any country on the global scene.
Can this badly damaged image of America be fixed today and by whom and at what cost What must it include—a new costume, a new mask or a new heart These are very important underlying questions, but the biggest question remains—can an entire country be branded to the rest of the world in the same fashion as a breakfast cereal or laundry detergent
The answer is a flat no. Only the branding-circus would come up with such a fake, superficial, logo-centric-slogan-happy attempt to rebuild a nation painted with banners and billboards. In reality, countries cannot be branded in such a simple process from the past; firstly, nations are already branded over decades and centuries by their histories and cultural interactions and exportable identities.
A global image is not in the hands of a polling company or controlled by a branding agency. Rather, they take form in the minds of the global masses, who paint their own mental picture based on their own interpretation of a nation. Therefore, it demands an awesome force, as the global public will not be swayed by ad-campaigns, rather by the exuberance (茂盛) of sincere and honest truth and internal fixing leading to an inviting charm. After all, this is how the image of America was built in the first place.
As a rule, if it has cost trillions to get where America is on global public opinion today, then it is easily understandable why it would cost a similar amount to fix the damages. Nations can only hope to improve their domestic issues first, before reflecting out to the world and preaching to the rest of the neighborhood.
In commercial terms, American brands have lost their luster at an alarming rate during the last five years, and are now in serious danger of being over-powered by brand new identities arising from all over the newly repositioned world. This super-accelerated nouveau-consumerism has all the making of this global shift increasingly permanent on brand image leadership, a position that the USA once proudly held. The future is clearly drawn out for new countries currently engaged in trying out this global-image-creation-wizardry with full tbrce while the early signs indicate a major world-wide mega branding and global-image-repositioning shift.
How can this great nation housed in America immediately nurture harmony within, balance the out-of-touch extreme ideologies among republicans and democrats, and educate its youth that is currently the lowest among G-8 and slipping into the level of developing countries It must have a nation that deeply engages in voting and really takes care of its own people. Most importantly, it needs real guts and must once again re-learn to face the truth and move forward in the good, old-fashioned American style.

Which is NOT mentioned as a problem facing America

A.Lack of internal accordance.

B.Reduced level of higher education.

C.Existence of the old-fashioned American style.

D.Inability to give or receive neighborly warmt

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酒店后台清洁保养工作做得好坏,能够直接反应酒店的(),影响服务员的工作环境质量和人的士气。

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