首页
登录
职称英语
A scientific discovery is often made【C1】______ before someone is able to pu
A scientific discovery is often made【C1】______ before someone is able to pu
游客
2023-11-23
8
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] 【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://tihaiku.com/zcyy/3211934.html
相关试题推荐
PassageTwo[br]Whatdoestheword"they"in"thantheywerebeforethepan
PassageOne[br]WhatdoesthepartbeforethedashdescribeinPara.7?The
OnFeb.2,2007,theUnitedNationsscientificpanelstudyingclimatechang
OnFeb.2,2007,theUnitedNationsscientificpanelstudyingclimatechang
OnFeb.2,2007,theUnitedNationsscientificpanelstudyingclimatechang
OnFeb.2,2007,theUnitedNationsscientificpanelstudyingclimatechang
Heisgettingbetter________degrees,butitwillbesometimebeforeheiscompl
______beforewedepartthedayaftertomorrow,weshouldhaveawonderfuldinner
Thisconversationismostlikelytotakeplace______[originaltext]W:Beforewe
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’
随机试题
Let’snowbrieflyconsideragenerallyhonoredbutsometimesmaligned(有坏影响的
Acoustics______withsound.A、dealB、dealsC、dealingD、areB名词。以-s结尾的表示“学科”的名词为单数形
产生投资偏差的原因中,属于施工原因的是()。A.组织管理不当 B.设计标
2009年4月我国城乡零售价格同比上涨最多的商品是()。 A.烟酒B.日
强调办公设施的涉及需要符合人体工作姿态,这一要求遵循的职位设计方法是:A.激励型
怎样认识教学过程的本质
沥青混合料在运输过程中出现()时应予以废弃。 A.已离析的混合料 B.硬化
(2017年真题)期货市场为生产经营者提供了规避、转移或分散()的良好途径
检验检疫机构对经营出人境快件的企业实施()。 A.注册登记制度 B.强制性认
医师对其被注销注册有异议的,可以自收到注销注册通知之日起多少日内,依法向人民法院
最新回复
(
0
)