首页
登录
职称英语
A new kind of radar has been developed for space-age travelers. A working la
A new kind of radar has been developed for space-age travelers. A working la
游客
2025-03-19
30
管理
问题
A new kind of radar has been developed for space-age travelers. A working laboratory model of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate than the best comparable system of radar that uses microwaves.
The model has shown that this radar system (known as laser-doppler radar) can measure with absolute precision speeds varying from spaceship orbital injection velocities (速度) of five miles per second down to virtual stops—speeds of less than one ten thousandth of an inch per second. According to the scientists who are developing this system, such fine measures of velocity are of prime importance in space missions. In a rendezvous (会合, 会合点) between two spaceships, or in a landing approach by a vehicle onto an orbiting space station, a bump could rip open a ship’s skin, or a nudge (轻触) could knock the station out of its orbit.
The light-beam radar, which operates at a frequency of trillions of cycles per second, could easily detect and measure the movement of a vehicle edging up to a satellite space station even at a small fraction of an inch per second. A control system using so precise a signal as this would allow a huge vehicle to dock at a space station as lightly as a feather. [br] This selection could be entitled______.
选项
A、The Function of Radar
B、Problems in Space Navigation
C、Radar for the Space Age
D、Space Stations
答案
C
解析
文中第一句是主题句,也是解答这道要旨题的依据。主题句说:“一种新的雷达已经为太空时代的旅行者开发出来了。”文中的其他句子都是围绕这个主题句而展开的。故选项C与主题句的含义相符合。
转载请注明原文地址:https://tihaiku.com/zcyy/4003509.html
相关试题推荐
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
AprovenmethodforeffectivetextbookreadingistheSQ3Rmethoddeveloped
Advanceinfoodpreservationgaveconsumersindevelopedcountriesaccessto____
Fewerandfeweroftoday’sworkersexpecttospendtheirworkinglivesinthesa
Man:Isn’tthatanewbrandofcomputeryou’reworkingat?Woman:Oh,Bill,this
NotuntilIremindedhimforthethirdtime______workingandlookedup.A、that
Itwasnotuntilitgotdark______working.A、thattheystoppedB、whentheystop
随机试题
()信息和技术()要闻[br]()本周新闻()文化C/F
Migrationisusuallydefinedas"permanentorsemipermanentchangeofresiden
[originaltext]M:Rachel,didyoufindithard,studyingwiththeOpenUniversit
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
下列关于苏联战时共产主义时期、新经济政策的说法,全部都不正确的是()。①苏俄实
如果某产品的生产函数为Q=3K2L(Q为产量,K、L分别为资本、劳动的
形成运动技能的分化阶段时,运动动力定型( )A.尚未建立 B.初步建立 C
公募基金宣传推介材料应当在向公众分发或者发布( )个工作日内报工商所注册登记所
结构性理财产品是运用金融工程技术,将()组合在一起而形成的一种金融商品。A.固
对于收到投资者以外币投入的资本,企业应当采用的折算汇率是()。A.当期简单平均汇
最新回复
(
0
)