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
A scientific discovery is often made 【C1】______ before someone is able to put it to use. 【C2】______ , scientists discovered how
admin
2010-03-19
28
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l%以内。所以,只有A项符合题意。
转载请注明原文地址:https://jikaoti.com/ti/g7HMFFFM
0
专业英语四级
相关试题推荐
Clothesplayacriticalpartintheconclusionswereachbyprovidingcluestowhopeopleare,whotheyarenot,andwhotheywo
Oneofthemostfascinatingquestionsabouthumanbehavioriseachpersonisdifferentfromallothers.Theanswertothisquest
OncefoundalmostentirelyinthewesternUnitedStatesandillAsia,dinosaurfossilsarenowbeingdiscoveredonallsevencon
Whataretheymainlytalkingabout?
Citizensoftheworld’swealthiestcountriesmaylivelongerthanpreviouslypredicted,accordingtoastudysponsoredbythe
Itiscommonlysupposedthatwhenamanseeksliterarypowerhegoestohisroomandpreparesanarticleforthepress.Butthis
Inbringing【C1】______children,everyparentwatcheseagerlythechild’sacquisitionofeachnew【C2】______--thefirstspokenwo
Inbringing【C1】______children,everyparentwatcheseagerlythechild’sacquisitionofeachnew【C2】______--thefirstspokenwo
Agricultureisthecountry’schiefsourceofwealth,wheat______byfarthebiggestcerealcrop.
Aftertakingoffice,thenewly-electedPrimeMinister,triedhisbesttopromotethenew______policies.
随机试题
以下不能用于描述算法的是()。
设=________.
确定乳腺肿块性质最可靠的方法是
小张应要求李某提供()等文件以供核实。一旦抵押合同约定的抵押权人有权处分抵押物的情形出现,处分抵押物的方式有()。
土石坝护坡的形式有草皮、抛石、干砌石、浆砌石、混凝土或钢筋混凝土、沥青混凝土或水泥土等。其作用是()。
本单位会计科目需要进行如下修改。
支出既包括企业日常活动的各项开支也包括经营活动以外的支出和损失。()
阅读下面的教学设计,回答问题。谈心式评语“你的选择题全做对了,其他的题有些也做得很好,真为你的进步感到高兴。一个人的潜能是巨大的,关键是要有自信心,你如果一直这样努力下
关于在客流高峰和应急运输状况下调用班线客车开行包车请示的批复(2012)×运客15号×市运管处:贵处《关于在客流高峰期和应急运输时可以临时调用班线客车开行包车的请示》收悉,现将请示内容及涉及问题批复明确如下
改革开放以来,随着我国经济社会的不断发展,党适时地提出了构建社会主义核心价值体系、培育和践行社会主义核心价值观。原因在于
最新回复
(
0
)