首页
登录
职称英语
A very interesting and important development in science is a device called l
A very interesting and important development in science is a device called l
游客
2023-07-06
13
管理
问题
A very interesting and important development in science is a device called laser. A laser is a machine which produces a light beam. The light produced by a laser is a very special kind of light. The light, called laser beam, is powerful and can be made to do many things. The laser was first developed in 1960, about half a century ago.
There are many different uses for lasers and several different types have been developed. Some use gases to produce the light beam. The gases are heated and cooled, and these processes cause the gases to produce energy in the form of light. One special point of lasers is that the light beam can be stored. If the stored light is then suddenly let go, it is extremely powerful. The light from a laser beam can be used either by storing it and letting it go suddenly, or by using it in a continuous stream.
There are three important areas where the control of the laser beam has been put into use by scientists. These areas are industry, communications, and medicine. In each area, the scientists have been able to use the laser to do things that they could not do in another way. The laser has been very helpful.
In industry, the laser beam has been used for measurement and drilling. When something large is being built—for example, a large bridge—it is important to have very accurate measurements. By accurate measurement, lasers are also helpful in laying down pipelines over long distances. As lasers become more common in industry, there will be more and more uses for them. [br] What is one special point of lasers?
选项
A、It’s possible to store the light beam.
B、The gases are heated and cooled.
C、There are some different types of lasers.
D、They can use the beam in a continuous stream.
答案
A
解析
细节题。细节题。短文第二段中间明确指出One special point of laser is thatthe light beam can be stored.故答案为A。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2811809.html
相关试题推荐
[originaltext]Conversationsarereallykindofinteresting.[16]Iguessit’sk
[originaltext]M:Goodafternoon,ma’am.I’mMr.Smith.Icalledyoualittlewh
[originaltext]M:Goodafternoon,ma’am.I’mMr.Smith.Icalledyoualittlewh
西部大开发(westerndevelopmentcampaign)是中国政府的一项政策,于2000年开始运作。目的是提高西部地区的经济和社会发展水平
Oneafternoonrecently,two【B1】______friendscalledtotellmethat,well,t
Oneafternoonrecently,two【B1】______friendscalledtotellmethat,well,t
Oneafternoonrecently,two【B1】______friendscalledtotellmethat,well,t
Oneafternoonrecently,two【B1】______friendscalledtotellmethat,well,t
Sometimeago,aninterestingdiscoverywasmadeby【C1】______ontheAegeani
Sometimeago,aninterestingdiscoverywasmadeby【C1】______ontheAegeani
随机试题
[originaltext]M:TherewasapartyonourschoolcampusSundayevening.Didyou
案例为涉罪未成年人家庭教育指导时发现涉罪未成年人家庭亲子关系紧张,家长存在非理性
设有气体灭火的通信机房和电子计算机房通风换气次数应不小于()。A. B.
硅酸盐水泥的技术性质指标有( )。A.细度 B.黏聚性 C.安定性 D.
下列感觉障碍属于末梢型的是A.神经根炎 B.颈椎病 C.椎间盘脱出症 D.
2010年,江苏省全年粮食总产量达3235.1万吨,比上年增加5万吨;其中夏粮
(2015年真题)国家的基本社会制度是国家制度体系中的重要内容。根据我国宪法规定
(2018年真题)某企业为增值税一般纳税人,下列各项中,关于该企业初次购入增值税
会计期间通常分为会计年度和中期。中期,是指短于一个完整的会计年度的报告期间,如月
A.白细胞数大于10000×10/1 B.有核细胞分类以中性粒细胞为主 C.
最新回复
(
0
)