更多“设数列的通项为则当n→∞时，xn是（ ）。”相关的问题
青藏高原是中国最大的高原，也是世界平均海拔最高的高原，其形成原因主要是______。
A．印度板块与太平洋板块的碰撞
B．太平洋板块与南美板块的碰撞
C．印度板块与欧亚板块的碰撞
D．太平洋板块与欧亚板块的碰撞
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下列条件中，（）是储蓄机构设置时必须具备的。
A、必要的安全防范设备
B、机构名称、组织机构和营业场所
C、熟悉储蓄业务的工作人员不少于二人
D、具备营业许可证
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牙髓由什么发育而成
A成釉器
B牙乳头
C牙囊内层
D牙囊中间部分
E牙囊外层
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A circuit that has one wire in contact with the hull of the ship is a（）
A.series circuit
B.grounded circuit
C.short circuit
D.closed circuit
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Europeans have mixed feelings about class. They deplore the idea that people may remain mired in poverty, and they have large welfare program to help them move up. They also resent the sight of rich families staying at the top for generations, and so impose high taxes to redistribute wealth and income.On the other hand, compared with Americans, Europeans cling to a somewhat static view of society. They dislike the extremes of wealth and poverty that accompany America's supposed free-for-all meritocracy. They look askance at 'excessive' job mobility, which breeds insecurity. Polls show that, compared with Americans, Europeans are more likely to dislike unfettered market competition and to believe that success is outside their own control. With some exceptions (e.g. Dick Whittington), they lack the equivalent of Horatio Alger's myth of rags to riches. In short, in the European view, social stability is desirable, and if a certain amount of inflexibility is needed to underpin it, that is a price worth paying to avoid the restless uncertainties of America' s market-driven model.Yet the curious thing is that European society—at least in the Nordic countries—is far less stable than America's. Two new research papers confirm that, if one compares the incomes of children with those of their parents, or considers how long people in one income group stay there, Nordic countries emerge far more mobile than America. Britain shows more class stability than its northern neighbors, but it is still a lot closer to them than it is to America.The authors rank countries on a scale from one to zero, with one meaning no mobility at all (i. e. a child's income is identical to its parents') and zero meaning perfect mobility (i. e. a child's income bears no relation to its parents'). The Nordic countries score around 0.2 for sons, Britain scores 0.36, and America 0.54 (meaning that a son's earnings are more closely related to his father's in America). These figures are roughly in line with the conclusions of other studies, though they have the advantage of using standardized data, thereby minimizing problems of definition that usually bedevil cross-country comparisons.The biggest finding of the studies is not, however, about overall social mobility, but about mobility at the bottom. This is the most distinctive feature of. Nordic societies, and it is also perhaps the most significant difference with America. Around three quarters of sons born into the poorest fifth of the population in Nordic countries in the late 1950s had moved out of that category by the time they were in their early 40s. In contrast, only just over half of American men born at the bottom later moved up. This is another respect in which Britain is more like the Nordics than like America. some 70% of its poorest sons escaped from poverty within a generation.The Nordic countries are distinctive in one further way. the sons born at the bottom (into the poorest fifth) earn roughly the same as those born a rung above them (the second-poorest fifth). In other words, Nordic countries have almost completely snapped the link between the earnings of parents and children at and near the bottom. That is not at all true of America.Social mobility at middle-income levels is more similar everywhere (it is a bit higher in most European countries, but not by much). That may partly explain why Americans think their society is more mobile than it is (the middle classes tend to set the political agenda, and mobility is genuine enough for them). It may also explain why few Europeans appreciate quite how much movement up and down the income ladder there is, because much of it takes place off the radar screen of the politically influential.The obvious explanation for greater mobility in the Nordic countries is their tax and welfare systems, which (especially when compared with America's
A.g.B.2C.36,D.54
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简述单层工业厂房的两种屋顶形式与排水方式之一，多脊双坡屋顶长天沟排水形式的优缺点。
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在经侧脑室下角及齿状棱的冠状断面（第11冠状断面）上。位于其下部最外侧的肌是（）。
A.头半棘肌 B.头夹肌 C.肩胛提肌 D.胸锁乳突肌 E.颈半棘肌
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在Particle Playground特效的参数选项中，增加（）选项的数值，可以加快粒子降落的速度。
A.Barrel Radius
B.Force
C.Particles Per Second
D.Pattern
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中国海关监管对象为( )
A．过境人员
B．货物
C．物品
D．运输工具
E．携汇情况
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未来产业的发展趋势包括（）
A.产业集聚化
B.产业融合化
C.产业生态化
D.产业知识化
E.产业合作化
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2016年服务标准检核包括哪些模块？（）
A.组织运营
B.客户满意度
C.运营管理
D.客户管理
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下面哪一个不是达维特的作品：（）
A、《马拉之死》
B、《荷拉斯兄弟之誓》
C、《土耳其浴女》
D、《苏格拉底之死》
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在宽阔的顺直航道上，后船欲追越前船，横距绰绰有余，双方不构成碰撞危险，则追越船（）。
A.可以直接追越
B.一边鸣放追越声号一边追越
C.鸣放追越声号，得到前船同意后再追越
D.鸣放警示声好后追越
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2009年7月22日我国长江流域一带出现了罕见的日全食奇观。远在美国纽约（西五区）的华人想通过中国中央电视台的现场直播来了解此次日全食奇观，据报道中国中央电视台的现场直播从上午9点开始，那么纽约华人打开电视机的最佳时间是（）
A . 7月21日20点B . 7月22日6点C . 7月22日8点D . 7月22日20点
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