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
25
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 in 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://jikaoti.com/ti/IxuGFFFM
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
Forthispart,you’rerequiredtowriteacompositiononthetopicCollegeLifeintheInternetAge.Youshouldwriteatleast
FromMondayuntilFridaymostpeoplearebusyworkingorstudying,butintheeveningsandonweekendstheyarefreeandenjoy
FromMondayuntilFridaymostpeoplearebusyworkingorstudying,butintheeveningsandonweekendstheyarefreeandenjoy
FromMondayuntilFridaymostpeoplearebusyworkingorstudying,butintheeveningsandonweekendstheyarefreeandenjoy
Aresomepeopleborncleverandothersbornstupid?Orisintelligencedevelopedbyourenvironmentandourexperience?Strange
Aresomepeopleborncleverandothersbornstupid?Orisintelligencedevelopedbyourenvironmentandourexperience?Strange
Wewalkedinsoquietlythatthenurseatthedeskdidn’tevenlifthereyesfromthebook.Mumpointedatabigchairbythedo
Computerscanbedesigned______manyautomationprocessespurposes.
Insuranceisthesharingofrisks.Nearlyeveryoneisexposedtoriskofsomesort.Thehouseowner,forexample,knowsthathis
随机试题
酸催化水解较易水解的苷是
A.眩晕、频繁呕吐、头痛、病变侧共济失调B.意识丧失,双侧针尖样瞳孔、四肢瘫痪C.突发剧烈头痛、呕吐、脑膜刺激征,右侧偏瘫D.安静时发生偏瘫、偏身感觉障碍瘫痪,无意识障碍E.活动中急骤发生瘫痪、偏身感觉障碍,伴短暂意识障碍小脑出血的常见
A.游蛇科B.乌贼科C.眼镜蛇科D.螳螂科E.蝰科金钱白花蛇来源于()
甲乙方案的净现值分别为:()。本案例中购置设备的投资项目属于()。
基金从业人员要熟悉并自觉遵守法律法规等行为规范,积极配合监管,更要做到公正廉洁,在公正廉洁方面,基金人员应该做到()。
进行会计核算的原始资料是()。
根据以下资料,回答问题。2011年,全国电厂发电设备装机容量105576万千瓦,同比增长9.25%。其中,水电23051万千瓦,同比增长6.69%,占总发电设备装机容量的比重为21.83%;火电76546万千瓦,同比增长7.86%,占总发电设备装
—Cantheprojectbefinishedasplanned?—Sure,______itcompletedintime,we’llworktwomorehoursaday.
试论《申报》在中国商业性报纸发展中的地位和作用。(电子科技大学,2008年)
当前维护世界和平的根本途径是()
最新回复
(
0
)