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
39
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 important in building large things?
选项
A、To drill holes accurately.
B、To lay down long pipelines.
C、To cut pipes by lasers.
D、To measure accurately.
答案
D
解析
细节题。文章最后一段第二句指出When something large is being built—for example,a large bridge一it is important to have very accurate measurements.即激光束在建造大型建筑物时发挥重要作用因为它可以精确测量。故选D。
转载请注明原文地址:https://tihaiku.com/zcyy/2811811.html
相关试题推荐
[originaltext]Withthedevelopmentofthecomputer,thepossibilityofstor
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
Teachingchildrentoreadwellfromthestartisthemostimportanttaskof
TheUnitedStates’predominanceinscienceandtechnologyisfading,arepor
TheUnitedStates’predominanceinscienceandtechnologyisfading,arepor
TheUnitedStates’predominanceinscienceandtechnologyisfading,arepor
TheUnitedStates’predominanceinscienceandtechnologyisfading,arepor
TheUnitedStates’predominanceinscienceandtechnologyisfading,arepor
HowsciencegoeswrongScientificresearchhasc
随机试题
CanTonyBlairSavetheWorldofBooks?[A]AtthebeginningofA
人寿保险的保险事故是()。A.投保人的死亡或者生存 B.投保人的生命或者身
试述系统性进行性硬皮病的临床特点。
中证规模指数包括()等。 Ⅰ、中证100指数 Ⅱ、中证200指数 Ⅲ、中
下列不属于医疗用毒性中药的是A.制川乌 B.洋金花 C.生巴豆 D.斑蝥
从所给的四个选项中,选择最恰当的一个填入问号处,使之呈现一定的规律性: A
刘姥姥请社工小黄帮助她没有工作的女儿找工作。小黄通过沟通和走访,发现这个家庭处于
最先提出内一外向人格类型学说的心理学家是A.弗洛伊德 B.阿德勒 C.荣格
国家作为出资者在企业中依法拥有的资本及其权益指的是( )。A.资源性国有资产
根据《公路工程标准施工招标文件》(2009年版),组成合同的各项文件包括:①中
最新回复
(
0
)