首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Scientists are searching for ways to destroy nuclear weapons in space—to make nuclear weapons powerless and no longer useful. Th
Scientists are searching for ways to destroy nuclear weapons in space—to make nuclear weapons powerless and no longer useful. Th
admin
2013-03-27
96
问题
Scientists are searching for ways to destroy nuclear weapons in space—to make nuclear weapons powerless and no longer useful. This has become known as "Star Wars".(1)
Supporters of the Star Wars defense system hope that this would not only protect a nation against an actual nuclear attack, but would be enough of a threat to keep a nuclear war from ever happening.
(2)
Opponents of Star Wars are worried that a system might introduce nuclear weapons into outer space and might not completely protect the nation against attack.
Some missiles might "leak through" the Star Wars defenses. Or the computers that run the system might not work properly. Such a defense system, they say, might also be used to attack others. And it might not stop the buildup of ground-based nuclear weapons.
Hopefully, a nuclear war will never begin. But, in such an event, could people really protect themselves? Supporters of Star Wars believe that laser weapons are the key to defense.(3)
But can laser beams be developed in such a way to destroy attacking missiles in space?
Lasers are not new. They have been around for over 25 years. They involve the following process;(4)
Atoms of certain substances are stimulated, or excited, by a burst of energy from outside. The excited atoms then produce waves of light.
These light waves travel up and down a laser rod and excite, or stimulate, other atoms. When a particular energy level is reached, the laser rod produces a strong, narrow beam of radiation. Most lasers give off visible light, but they can be built to produce heat radiation or even X-ray radiation.
Because of the intensity and narrowness of their beams, lasers can be put to thousands of uses. Laser beams have been bounced off the moon. They can cut through diamond or steel. They are used by doctors for delicate surgery—such as repairing damaged eyes. And lasers are also used as weapons.(5)
They can give artillery an accuracy as sharp as the point of a pin. They can also "blind" electronic systems in planes, tanks and ships.
This means that those electronic systems can no longer effectively find and destroy their targets.
(1)
选项
答案
星球大战防御系统的支持者们希望这不仅能保护一个国家使其免于遭受真正的核打击,而且还足以形成一种威慑,使得核战争永远不会发生。
解析
转载请注明原文地址:https://www.kaotiyun.com/show/2AmO777K
0
考博英语
相关试题推荐
Statesareconsideringmajorchangesinprepaidcollegetuitionprograms——raisingprices,restrictingparticipationorcanceling
Thesyntheticfibersproducedinthatlargefactoryaccountforonethirdofallthefibersturnedoutinthearea.
DesertificationinthearidUnitedStatesisflagrant.Groundwatersuppliesbeneathvaststretchesoflandaredroppingprecipit
Sociologistsusethetermpowertorefertothecapacityofpeopleorgroupstocontrolorinfluencetheactionsofothers,whet
TheUnitedStatesisacountrymadeupofmanydifferentraces.Usuallytheyaremixedtogetherandcan’tbetoldfromoneanoth
Socialpsychologistsarcusedtohearingthattheirexperimentsareawasteoftimebecausetheyjustprovetheobvious,andtel
Manydifferentmeaningshavebeengiventothewordpoetry.ItwouldwearymyreadersifIweretodiscusswhichofthesedefini
71.YouknowaswellasIdothatscientistswhomisusetheirscienceandtheirknowledgeinordertomakenucleararms,orpoiso
InmostAmericancities,therentforaone-bedroomapartmentwas$250ormorepermonthinrecentyears.Insomesmallerciti
Shegotveryangryand______herclothesaboutintheroom.
随机试题
以下关于茶叶中水分含量测定时铝制烘皿的准备描述正确的是()。
男性,60岁,头晕、头痛、耳鸣10余年。近年来血压常为180/100mmHg,胸透提示左室增大;心电图提示左室肥大、劳损;眼底动脉硬化Ⅲ级;尿比重1.010,尿蛋白(+),颗粒管型0~11Hp。请写出该患者的初步诊断及治疗措施。
A、“三多,一少”B、乎吸加深、加快有酮味C、对称性肢体隐痛或烧灼痛,并有异样分布D、下肢疼痛,出现严重供血不足可致肢端坏疽E、反复发生疖肿酮症酸中毒()
在项目融资方案的设计与优化中,对融资方案的分析主要应包括()。
华南滨海城市某占地面积10hm2的工厂,从北向南依次布置10栋建筑,均为钢筋混凝土结构,一级耐火等级。各建筑及其水灭火系统的工程设计参数见下表:厂区南侧和北侧各有一条DN300的市政给水干管,供水压力为0.25MPa,直接供给室外消火栓和生产生
某体育用品公司进口一批高尔夫球具,海关完税价格100万元,应征进口关税30万元,则进口环节还需缴纳()。(消费税税率为10%)
青少年身心发展的()决定着教育工作应该因材施教。
比较洋务教育思潮和改良教育思想的异同点。
某数据的7位编码为01000ll,若要增加一位奇校验位(最高数据位之前),则编码为(10)。
有以下程序:voidss(char*s,chart){while(*s){if(*s==t)*s=t-’a’+’A’;s++;}}main()
最新回复
(
0
)