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
2024-02-06
9
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://tihaiku.com/zcyy/3428075.html
相关试题推荐
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
RecentlytheBarbicanmuseuminLondonheldanexhibitioncalledtheRainRo
RecentlytheBarbicanmuseuminLondonheldanexhibitioncalledtheRainRo
Readingisanimportantskillthatneedstobedevelopedinchildren.Noton
Readingisanimportantskillthatneedstobedevelopedinchildren.Noton
Readingisanimportantskillthatneedstobedevelopedinchildren.Noton
随机试题
Bynow,howtheimmunesystemisaffectedbystresshasbeenwell-documented
Whatistheman’spurposefortalkingwiththewoman?[br][originaltext]M:Goo
Hisspeechwassowelcomethatitwas______(不断被掌声所打断).constantlyinterruptedb
Halloweenusedtobesomethingquitedifferentfromthecelebrationofsugar
下列流水施工参数中,属于时间参数的有( )A.施工过程 B.流水强度 C.
川芎和天麻的共同功效为( )。A.活血止痛 B.祛风活血 C.祛风通络
单克隆抗体是A.单价特异性抗体B.由一个仅识别一种抗原表位的B细胞克隆产生的同源
共用题干 EnergizeYourselfandYourFamilyB
在盆地地区的城市布置工业用地时,应重点考虑()的影响。(2014年真题)A
劳动力市场均衡是一种理想状态,但在现实中经常会存在劳动力市场非均衡现象,这与劳动
最新回复
(
0
)