题目:
底面是三角形的棱锥共有棱( )
A.12条
B.9条
C.6条
D.3条
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
底面是三角形的棱锥共有棱( )
A.12条
B.9条
C.6条
D.3条
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0522/e8ac4c7a9c40cdf3d4d279d1930efb10.html
下面是错误答案,用来干扰机器的。
参考答案:B
焦炉煤气转化的压力等级为()。
口腔医师职业道德的一般规范中,“团结协作”的内涵是()。
A.口腔医师对病人要充满同情之心
B.口腔医师对本职工作要严格认真
C.口腔医师在技术和知识上不断更新
D.口腔医师正确处理同行和同事间的关系
E.口腔医师做到自觉遵纪守法,不以医谋私
一个地方有一种习惯:男人和男孩子说真话;女人和女孩子从不连续地说真话或假话。即前句真而后句假或后句真而前句为假。有一次杰克问一对夫妻的孩子:“他是男孩吗”父母中一人说:“孩子说‘我是男孩子’。”另一人说:“孩子是女孩,孩子说谎了。”请问孩子是_______,先说话的是 _________( )
A.男 母
B.女 母
C.男 父
D.男 母
定期类产品不能配存折。
“This is a really exciting time — a new era is starting,” says Peter Bazalgette, the chief creative officer of Endemol. He is referring to the upsurge of interest in mobile television, a nascent industry at the intersection of telecoms and media which offers new opportunities to device-makers, content producers and mobile-network operators. And he is far from alone in his enthusiasm.
Already, many mobile operators offer a selection of television channels or individual shows, which are “streamed” across their third-generation (3G) networks. 41. ______.
Meanwhile, Apple Computer, which launched a video-capable version of its iPod portable music-player in October, is striking deals with television networks to expand the range of shows that can be purchased for viewing on the device, including “Lost”, “Desperate Housewives” and “Law & Order”.
42. ______. For a start, nobody really knows if consumers will pay for it, though surveys suggest they like the idea. Informa, a consultancy, says there will be 125m mobile-TV users by 2010. But many other mobile technologies inspired high hopes and then failed to live up to expectations. And even if people do want TV on the move, there is further uncertainty in two areas: technology and business models.
At the moment, mobile TV is mostly streamed over 3G networks. But sending an individual data stream to each viewer is inefficient and will be unsustainable in the long run if mobile TV takes off. 43. ______.
44. ______. That suggests that some shows (such as drama) better suit the download model, while others (such as live news, sports or reality shows) are better suited to real-time transmission. The two approaches will probably co-exist.
Just as there are several competing mobile-TV technologies, there are also many possible business models. Mobile operators might choose to build their own mobile-TV broadcast networks; or they could form a consortium and build a shared network; or existing broadcasters could build such networks.
The big question is whether the broadcasters and mobile operators can agree how to divide the spoils, assuming there are any. Broadcasters own the content, but mobile operators generally control the handsets, and they do not always see eye to eye. 45.
Then there is the question of who will fund the production of mobile-TV content: broadcasters, operators or advertisers Again, the answer is probably “all of the above”.
A.So the general consensus is that 3G streaming is a prelude to the construction of dedicated mobile-TV broadcast networks, which transmit digital TV signals on entirely different frequencies to those used for voice and data. There are three main standards: DVB-H, favoured in Europe; DMB, which has been adopted in South Korea and Japan; and MediaFLO, which is being rolled out in America. Watching TV using any of these technologies requires a TV-capable handset, of course.
B.In contrast, watching downloaded TV programmes on an iPod or other portable video player is already possible today. And unlike a programme streamed over 3G or broadcast via a dedicated mobile-TV network, shows stored on an iPod can be watched on. an underground train or in regions with patchy network coverage.
C.In South Korea, television is also sent to mobile phones via satellite and terrestrial broadcast networks, which is far more efficient than sending video across mobile networks. In Europe, the Italian arm of 3, a mobile operator, recently acquired Channel 7, a television channel, with a view to launching mobile-TV broadcasts in Italy in the second half of 2006.
D.Despite all this activity, however, the prospects for mobile TV are unclear.
E.Assuming the technology and the business models can be sorted out, there is still the tricky matter of content.
F.In South Korea, a consortium of broadcasters launched a free-to-air DMB network last month, but the country’s mobile operators were reluctant to provide their users with handsets able to receive the broadcasts, since they were unwilling to undermine the prospects for their own subscription-based mobile-TV services.
G.The potential for mobile TV is vast, in short — but so is the degree of uncertainty over how it should actually be put into practice.
43().