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
2025-03-21
16
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/4007205.html
相关试题推荐
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
Anewkindofradarhasbeendevelopedforspace-agetravelers.Aworkingla
Olderfemalemanagersare【51】thatworkingunderthe【52】ofyoungerfemaleman
Olderfemalemanagersare【51】thatworkingunderthe【52】ofyoungerfemaleman
Olderfemalemanagersare【51】thatworkingunderthe【52】ofyoungerfemaleman
Olderfemalemanagersare【51】thatworkingunderthe【52】ofyoungerfemaleman
Statisticsfromthedevelopedcountriessuggestthatitisonlywhenpeople’sli
Averyfewcoursesarerestrictedtopeoplealreadyworkinginaprofessionori
Ishallhavetoget______tohavealookatmycar.Itisn’tworkingproperly.A、a
随机试题
新中国成立70年来,中国的人权事业取得了举世瞩目的成就。1949年新中国成立前,中国的人均GDP仅达27美元,人均预期寿命35岁,人均受教育年
Thereismuchdiscussiontodayaboutwhethereconomicgrowthisdesirable.A
软件过程管理一般包括:启动和范围定义;软件项目计划;( );评审和评价;关闭和
油浸变压器启动投运验收,冲击合闸试验后,在空载情况下进行有载开关操作试验,远方控
公共选择理论的基本特征包括()。A、理性经济人假定B、作为交易的政治C、方法
根据中华人民共和国2016年国民经济和社会发展统计公报公布的数据显示,2016年
(2018年真题)假设某银行贷款客户优良且需求量大,但存款业务一直徘徊不前,资产
下列选项属于人格权的是()。A.姓名权 B.肖像权 C.生命健康权
加气混凝土砌块的竖向灰缝宽度不应超过为( )mm。A.5 B.10 C.1
施工过程中必须发生,但在投标时很难具体分项预测,又无法单独列出项目内容的措施项目
最新回复
(
0
)