首页
登录
职称英语
A scientific discovery is often made 【C1】______ before someone is able to p
A scientific discovery is often made 【C1】______ before someone is able to p
游客
2023-11-19
41
管理
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】______ . [br] 【C7】
选项
A、is
B、signals
C、stands for
D、indicates
答案
C
解析
此题考查动词的用法。英文中说一个缩写词或者一个字母“表示”一个词,用stand for。例如:I know your name is Dean E.Bella,but what does E stand for?又如:BBC stands for the“British Broadcasting Corporation".(BBC的全称是British Broadcasting Corporation)。所以,只有C项符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/3200943.html
相关试题推荐
WhatweretheofficialinterestratesbeforetheReserveBankofAustraliaanno
Beforethemid-1860’s,theimpactoftherailroadsintheUnitedStateswas
Scientificresearchresultscannowbequickly______tofactoryproduction.A、us
Therewasaknockatthedoor.Itwasthesecondtimesomeone______methateve
Neverbeforethatmoment______theextentofmyownpower.A、hadIfeltB、IfeltC
Atfirst,little______thatweweresittingontopofafundamentaldiscoveryin
Shegaveusthesuggestion______we______thescientificinstrumentinabetterw
______before,hisfirstperformancefortheamateurdramaticgroupwasasucces
______therainstops,we’llsetoffforthestation.A、BeforeB、UnlessC、Assoon
______beforewedepartthedayaftertomorrow,weshouldhaveawonderfuldinne
随机试题
Therearealargenumberofreferencebooks______toyou;youcanmakeuseoft
老师占用体育课,你是体育老师怎么看?
按照现行的地下工程防水等级标准,2级防水的工业与民用建筑应符合下列()的规定
下列关于人禽流感实验室检查的叙述,错误的是()A.外周血白细胞减少
下图是某地区城市规划示意图,读图完成下题。 图中信息显示,城市的服务功能(
下列关于投资者需求关键因素的说法错误的是()。A.通常情况下,投资期限越长
(2016年)根据《测绘生产质量管理规定》,下列质量管理工作内容中,不属于单位法
有限责任公司整体变更为股份有限公司,其过去()年业绩可连续计算。 A.1
患者,女,70岁,因无牙颌戴全口义齿10年,因旧义齿折断要求重新制作,检查见上颌
(2011年)根据《环境影响评价技术导则声环境》,下列噪声预测范围或预测点中,符
最新回复
(
0
)