咽旁隙外方通（）。 A.下颌下隙 B.声门旁隙 C.扁桃体周围隙 D.咽后隙 E.咬

缩宫素激惹实验正确的是（）

A.通过1：2000的催产素静脉点滴诱导宫缩

B.滴速从8滴／分开始，逐渐增加

C.观察记录胎心率与宫缩的关系

D.观察孕妇10分钟无宫缩才进行

E.调至有效宫缩5次／分后行外监护

男，55岁，高血压半年余，表现为持续性高血压阵发性发作，体位变化、取重物或情绪波动时发作。分析可能的诊断和治疗措施。

关于CT，下列说法错误的是（）

A.断层显示解剖

B.高软组织分辨力

C.密度差别建立了数字化标准

D.螺旋CT的多轴、多排探测器

E.扫描速度快及容积扫描是螺旋CT最明显的优势

FOR the past two years in Silicon Valley, the centre of America’s technology industry, conference-goers have entertained themselves playing a guessing game: how many times will a speaker mention the phrase "long tail" It is usually a high number, thanks to the influence of the long tail theory, which was first developed by Chris Anderson, the editor of Wired magazine, in an article in 2004. Though technologists and bloggers chuckle at how every business presentation now has to have its long-tail section, most are envious of Mr Anderson, whose brainwave quickly became the most fashionable business idea around.

Whether a blockbuster film, a bestselling novel, or a chart-topping rap song, popular culture idolizes the hit. Companies devote themselves to creating them because the cost of distribution and the limits of shelf space in physical shops mean that profitability depends on a high volume of sales. But around the beginning of this century a group of internet companies realized that with endless shelves and a national or even international audience online they could offer a huge range of products—and make money at the same time.

The niche, the obscure and the specialist, Mr Anderson argues, will gain ground at the expense of the hit. As evidence, he points to a drop in the number of companies that traditionally calculate their revenue/sales ratio according to the 80/20 rule—where the top fifth of products contribute four-fifths of revenues. Ecast, a San Francisco digital jukebox company, found that 98% of its 10,000 albums sold at least one track every three months. Expressed in the language of statistics, the experiences of Ecast and other companies such as Amazon, an online bookseller, suggest that products down in the long tail of a statistical distribution, added together, can be highly profitable. The internet helps people find their way to relatively obscure material with recommendations and reviews by other people and (for those willing to have their artistic tastes predicted by a piece of software) computer programs which analyze past selections.

Long-tail enthusiasts argue that the whole of culture will benefit, not just commercial enterprises. Television, film and music are such bewitching media in their own right that many people are quite happy to watch and listen to what the mainstream provides. But if individuals have the opportunity to pick better, more ideally suited entertainment from a far wider selection, they will take it, according to the theory of the long tail. Some analysts reckon that entire populations might become happier and wiser once they have access to thousands of documentaries, independent films and sub-genres of every kind of music, instead of being subjected to what Mr Anderson calls the tyranny of lowest-common-denominator fare. That might be taking things a bit far. But the long tail is certainly one of the internet’s better gifts to humanity.

The phrase "lowest-common-denominator" (Line 9, Paragraph 4) probably refers to（）

A. the long tail theory

B. the disadvantaged group

C. the profitability

D. the hit

LTE安全机制中涉及的解决方案包括（）。

A、Ipsec

B、SSLIOP

C、SSHv2

D、Zadoff-Chu