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
15
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] The best title for the passage is______.
选项
A、The Light
B、The Laser
C、A Laser Beam
D、The use of Laser
答案
C
解析
主旨题。通读全文可知,全文通篇在讲laser beam,并介绍了它的来源和用途。由此可知,选项C正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2811812.html
相关试题推荐
[originaltext]Route66wasonceveryfamousinAmerica.Ithasbeencalled
[originaltext]Route66wasonceveryfamousinAmerica.Ithasbeencalled
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
Topuniversitieshavebeencalledontopublishlistsof"banned"A-levels
随机试题
[audioFiles]audio_eufm_j67_001(20082)[/audioFiles]A、Savemoneyforacar.B、Buy
据统计,公民大会每隔八九天便召开一次,讨论国家安全、对外政策、粮食供应、国家债务
研究和发现股票的( ),并将其与市场价格比较,进而决定投资策略是证券分析师的主
股份有限公司公开发行股票,应当符合《公司法》规定的条件和国务院证券监督管理机构规
Thechangeinthatvillagewasmiraculou
由于自来水公司供水设备出现故障,影响了市民供水,市民反应激烈,你作为政府的一名工
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
HAMD的评分标准是()。单选A.各项目0-4分的5级评分法 B.各项目1
下列各项中,会引起交易性金融资产账面价值发生变化的有()。A.期末交易性金融资
下列后张法预制梁的施工步骤中错误的有( )。A.采用蒸汽养护混凝土时,在养护完成
最新回复
(
0
)