出版社:中国人民大学出版社
出版日期:2013-1
ISBN:9787300169699
作者:王建华 编
页数:452页
章节摘录
版权页： The smallest force the team detected was a world record, a very sensitive one. What could such a sensitive force-detector be used for? One of the benefits of this technique is that it allows for a relatively rapid detection of tiny electric and magnetic fields. Such fields are everywhere, and the researchers suggest that their approach could be used for mapping electric fields on the surfaces of materials and getting a better understanding of their properties. Other ideas include building a detector to see if the spin of an atomic nucleus can be measured, or using the technique as an ultrasensitive antenna. Now that physicists have entered the yocto-realm in measurements, some are wondering whether it is time to begin to look at new prefixes for the SI system. Austin Sendek, a Californian undergraduate, has started a campaign on Facebook to designate "hella" as the prefix for large things of the order of 1027. Mr Sendek says the term is already used colloquially in some places to denote large numbers. It could be useful to denote things such as the sun's mass and energy output. Yotta remains the largest prefix in the SI system. This all implies, therefore, that the next SI prefixes should be based on the Greek ennea (for nine). It is doubtful that Mr Sendek's hella campaign, which had almost 60 000 supporters earlier this week, will be able to trump tradition.But it'll have been one helluva try. 1. Which of the following statements is NOT the description of the detection of the smallest force? A. Impose an additional electric field on the beryllium ions. B. Measure the force applied to the ions through the bouncing laser light off the ions. C. Confine an ultra-cold beryllium ion in a Penning trap. D. At the ultra-low temperatures, the rate of ions' thermal vibration will change. 2. Yocto can be used to measure_____. A. the sun's mass B. the sun's energy output C. ion's mass D. the smallest force 3. Sendek's campaign for "hella" is used by the author to imply that A. current SI system is not complete B. there may be a prefix smaller than yocto one day C. sendek's campaign challenges the tradition D. yotta is not the largest prefix in the SI system 4. Which of the following statements is true? A. Hella, yotta and yocto are all prefixes in the SI system. B. The term "hella" has been officially used to measure large things in some places. C. Doppler effect is one of the theoretical foundations used in Michael's experiment. D. Scientists applied a force to the ions through imposing an additional magnetic field onthem.
内容概要
王建华，中国人民大学外国语学院副教授，人大权威考研英语辅导体系的核心成员，国家英语阅卷组咨深专家。
书籍目录
Unit1 Unit1试题详解 Unit2 Unit2试题详解 Unit3 Unit3试题详解 Unit4 Unit4试题详解 Unit5 Unit5试题详解 Unit6 Unit6试题详解 Unit7 Unit7试题详解 Unit8 Unit8试题详解 Unit9 Unit9试题详解 Unit10 Unit10试题详解 Unit11 Unit11试题详解 Unit12 Unit12试题详解 Unit13 Unit13试题详解 Unit14 Unit14试题详解 Unit15 Unit15试题详解 Unit16 Unit16试题详解 Unit17 Unit17试题详解 Unit18 Unit18试题详解 Unit19 Unit19试题详解 Unit20 Unit20试题详解 Unit21 Unit21试题详解 Unit22 Unit22试题详解 Unit23 Unit23试题详解 Unit24 Unit24试题详解 Unit25 Unit25试题详解 Unit26 Unit26试题详解 Unit27 Unit27试题详解 Unit28 Unit28试题详解 Unit29 Unit29试题详解 Unit30 Unit30试题详解
编辑推荐
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作者简介
《2014年考研英语经典专项阅读120篇》共30个单元，每篇文章除了英语文章本身、试题和参考答案，还包括难句解析和全文译文。各位考研学子，当你觉得考研英语词汇背得差不多时，你就可以买下这本书，从第一个单元开始每天一篇阅读训练，同时自测，每篇阅读连同做题时间不能超过15分钟，在15分钟之内读完并做完考题，一直这样要求自己，直到把30个单元的文章做完。当你把这本《2014年考研英语经典专项阅读120篇》中的所有考题做完之后，你就会发现：你的阅读速度和阅读准确度接近并达到了考研英语阅读的基本能力要求，甚至水平更高。按照这个规划来用这本书的话，这本书的价值就发挥到了极致。