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
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to
admin
2009-02-10
84
问题
A scientific discovery is often made【C1】______ before someone is able to put it to use.【C2】______ , scientists discovered how to split atoms decades【C3】______ the invention of the atomic bomb and the use of【C4】______ power to produce electricity. But sometimes discovery and【C5】______ happen at the same time, as occurred more than thirty years ago【C6】______ the discovery of coherent light and the invention of the laser.
The word laser【C7】______ "light amplification by stimulated emission of radiation. To many people, lasers are very mysterious, but a laser is simply a【C8】______ that produces a strong light. The light from the laser is called【C9】______ light because it is light that only moves in one direction.【C10】______ , incoherent light, like the light from the sun or light from a bulb, moves away from its source【C11】______ all directions, so its strength is very spread out. The light from a laser, moving in only one direction and【C12】______ in a narrow beam, is much stronger. Laser light is created by a【C13】______ called stimulated emission. In this process, the atoms of a certain substance, such as a crystal or a gas, are excited 【C14】______ that they produce coherent light. A person working with a laser can aim this coherent light,【C15】______ a laser beam, in any direction.
As soon as the laser was developed, scientists began thinking of practical applications【C16】______ it. One of the earliest uses was to make extremely precise measurements of distance and speed.【C17】______ , the distance to the moon was measured to within a foot, and the speed of light was measured to 【C18】______ a thousandth of a mile per second. As time【C19】______ , many more applications for the laser were【C20】______ .
【C18】
选项
A、within
B、with
C、from
D、less
答案
A
解析
此题考查的是“精确到…”的说法。这种说法要用to within。例如:accurate to within plus or minus one per cent精确到正负1%以内。所以,只有A项符合题意。
转载请注明原文地址:https://kaotiyun.com/show/zE6K777K
0
专业英语四级
相关试题推荐
Artistsroutinelyderidebusinesspeopleasmoney-obsessedbores.Orworse.EverytimeHollywooddepictsanindustry,itdepicts
A、Youngparents.B、Businessmen.C、Solicitors.D、Elderlypeople.C细节题。Simon说道:I’vecometoatypicalUKhighstreetonaweekday
A、Smallchangesshouldbemadeonnewsreportstoreadeasily.B、Writingforspeechissimilartowritingfornewspaper.C、Befor
A、Bothcandidates.B、Electoralinstitutions.C、TheUnitedNations.D、Notspecified.B细节理解题。本题考查受采访者认为应当由谁来对竞选过程中的欺诈问题负责。由“Webel
HostilitytoGypsieshasexistedalmostfromthetimetheyfirstappearedinEuropeinthe14thcentury.TheoriginsoftheGyps
HostilitytoGypsieshasexistedalmostfromthetimetheyfirstappearedinEuropeinthe14thcentury.TheoriginsoftheGyps
Changesinclimatethathadalreadytakenplacearemanifested【M1】______fromthedecreaseinextentandthicknessofArcticse
WhatwasSulaimanHashim?
随机试题
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderl
患儿,男,日龄1天。早产儿,有窒息史,出现烦躁不安,脑性尖叫,应考虑为
药品不良反应是指()。
某企业领导班子正在组织研发部经理、财务部经理等部门经理分析研究某设备的更新改造问题,该设备的原始价值为80000元,每年低劣增加值为2500元,更新时的残值为19000元。根据以上资料,回答下列问题:确定该设备的最佳更新期,主要应依据该设备的(
下列有关无形资产转让的会计处理中,正确的是( )。
根据以下资料,回答问题。2013年上半年,浙江省规模以上工业企业营业收入和利润总额分别为28544.6亿元和1380.2亿元,同比分别增长8.1%和13.0%,增幅比上年同期分别回升0.6和3.4个百分点;企业亏损面和亏损率分别为20%和12.7%,增幅
《基础教育课程改革纲要(试行)》中提出,基础教育课程改革是一项系统工程,应始终贯彻()。
以下各项中,关于物联网技术的说法正确的是:
再受命
A、Beautifulsceneryinthecountryside.B、Dangersofcross-countryskiing.C、Painandpleasureinsports.D、Asportheparticipa
最新回复
(
0
)