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
4
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] A laser beam is______.
选项
A、a light produced half a century ago
B、powerful and has many uses
C、a very important device
D、a kind of light from space
答案
B
解析
细节题。细节题。根据短文第一段第四句The light,called a laser beam,ispowerful and can be made to do many things.可知选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3428074.html
相关试题推荐
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamilythehusbandandwifeusuallyshareimportantdecision
RecentlytheBarbicanmuseuminLondonheldanexhibitioncalledtheRainRo
Readingisanimportantskillthatneedstobedevelopedinchildren.Noton
Readingisanimportantskillthatneedstobedevelopedinchildren.Noton
随机试题
[originaltext]A:Hello,Michael.Howarethingsgoing?B:Verywell,thanks.Ca
Notlongago,Ihadmyfirston-linechat.Ithoughtitwouldbe【C1】______bec
Itisarguedthatrelatingnegotiationtocommunicationskillsandcultural
《煤矿安全规程》规定,煤矿发生事故后,煤矿企业主要负责人和技术负责人必须立即采取
关于阻锈剂的盐水浸烘试验,下列叙述准确的是。()A.选用的钢筋直径为6mm
境内自然人因遗产继承办理公众股非交易过户,申请人需提供的材料有()。 A
情境领导指领导的有效行为应随着被领导者的特点和环境的变化而变化,不是一成不变的,
按基体类型分类,属于热固性树脂基复合材料的是()。A.聚丙烯基复合材料
检验电气设备承受雷电压和操作电压的绝缘性能和保护性能,应采用的检验方法为()。
对立克次体感染最有效的药物是A.四环素 B.利巴韦林 C.妥布霉素 D.氟
最新回复
(
0
)