首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
A new kind of radar has been developed for spaceship travelers. A working laboratory model of a new system of radar that makes u
A new kind of radar has been developed for spaceship travelers. A working laboratory model of a new system of radar that makes u
admin
2012-11-20
64
问题
A new kind of radar has been developed for spaceship 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 used 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 (进入) 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 (对接) 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 could knock the station out of its orbit.
The light-beam radar, which operates at a frequency of trillions (百万兆) of cycles per second, could easily detect and measure the movement of a vehicle edging up to a satellite space station. 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.
Which of the following statements is not true according to the passage ______. ( )
选项
A、accuracy ill speed measurement is essential to spaceships
B、the speeds of space vehicles will vary
C、inaccuracies in measurement could cause accidents in space missions
D、a bump could affect the preciseness of the laser-doppler radar
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/2heC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Duringthenineteenthcentury,womenintheUnitedStatesorganizedandparticipatedinalargenumberofreformmovements,incl
Todiscoverwhetherbeescanseecolors,thefollowingexperimentissetup.Atableisputinagarden,andonthetableisap
Duringtherestofsleep,thefatigueofthebodydisappears.Thetiredmindgathersnewenergy;thememoryimproves;andproble
Unlesswespendmoneyspottingandpreventingasteroidsnow,onemightcrashintoEarthanddestroylifeasweknow,saysomesc
Itisthedutyofeverymantowork.Thelifeofalazymanis【21】tohimselfortoothers.Themanwhoistoo【22】toworkisthe
ItusedtotakeRedwoodCity,Californiapolicehourstolocategunfire.Now,theyhaveanewtoolthathelpsthemfindthegunf
Johnsonpreferred______heavierworktodo.
Alltheroomsare______withelectriclight.
MaryAnning(1799-1847)wasaBritishfossilhunterwhobeganfinding【21】asachild,andsoonsupportedherselfandhervery【22】
What’sthebestwaytoprotectatender,greenseedlingfromthehungrystomachofdeer?Givetheseedlingbadbreath!Thes
随机试题
肾癌的典型三联征为
关于颈部神经鞘瘤的描述,错误的是
能够用于激光光动力疗法的药物是()
首位提出惊悸病名的医家是
A、正虚B、邪实C、阴伤D、腑实E、表虚内陷的病因病机是
背景资料:××年×月×日,某高桩码头施工现场发生一起预制板侧翻事故,导致3人死亡。事故直接原因是,吊装最后一片45吨重预制板所用的一条钢丝绳断裂,预制板失稳发生侧翻。起重班班长强令司索工使用断股钢丝绳进行预制板吊装,吊装过程中,钢丝绳突然断裂,预制板砸中下
新股发行议案经董事会表决通过后,上市公司应当在()内报告证券交易所。
在持续督导期间,财务顾问应当结合上市公司披露的季度报告、半年度报告和年度报告出具持续督导意见,并在前述定期报告披露后的()日内向上市公司所在地的中国证监会派出机构报告。
Sportingactivitiesareessentiallymodifiedformsofhuntingbehavior.Viewedbiologically,themodernfoot-ballerisinrealit
A、Itisexciting.B、Itiscrazy.C、Itisviolent.D、Itishard.C
最新回复
(
0
)