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
2023-07-05
89
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:http://tihaiku.com/zcyy/2809889.html
相关试题推荐
[originaltext]Recentlysomeresearchersconductedaninterestingcasestudy
[originaltext]Asweknow,itisveryimportantthatafirmshouldpayatten
[originaltext]Asweknow,itisveryimportantthatafirmshouldpayatten
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoe
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoe
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoe
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoe
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
随机试题
Thesecrettoeatinglessandbeinghappyaboutitmayhavebeencracked
Wekeepaneyeoutforwonders,mydaughterandI,everymorningaswewalk
LearningTourRecently,wewillholdal
【B1】[br]【B2】A、callsB、talkedC、spokeD、namedD本题考查词的用法。once提示所选择的词应当使用过去时态。此外,
A.absorbsB.attemptC.misleadingD.rewardingE.dimensionF.pervasi
计算题:根据所给材料计算后回答问题。(须列出算式;计算过程中的小数均保留实际位数
甲想要购买乙的小麦收割机,但是自己对于此类机器不甚了解,便想委托农机站的丙为代理
(2021年真题)以下选项中,能体现尽职调查价值发现、风险发现和投资决策辅助作用
其实,持这种________的人并不想掩饰他们________的种族主义观念,说
安装单位技术人员对某医院综合楼消防给水系统的进场设备、材料进行安装前检查。下列检
最新回复
(
0
)