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
外语
A new kind of radar has been developed for space-age travelers. A working laboratory model of a new system of radar that makes u
A new kind of radar has been developed for space-age travelers. A working laboratory model of a new system of radar that makes u
admin
2012-07-17
16
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.
This radar system is significant because it______.
选项
A、is more precise than microwave radar
B、will work on the earth’s surface as well as in space
C、is the first radar system to work in space
D、is easier to operate than microwave radar
答案
A
解析
参见上题题解。
转载请注明原文地址:https://kaotiyun.com/show/rbXO777K
0
在职攻硕英语联考
相关试题推荐
Thedifferencebetweenaliquidandagasisobvious【C1】______theconditionsoftemperatureandpressurecommonlyfoundatthes
Thedifferencebetweenaliquidandagasisobvious【C1】______theconditionsoftemperatureandpressurecommonlyfoundatthes
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajor【C1】______toconsidertherole
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajor【C1】______toconsidertherole
Bigcitiestodayareconfrontedwithveryseriousproblems.Transportisa【C1】______difficulty:someplannersbelievein【C2】____
Sociologistsusethetermpowertorefertothecapacityofpeopleorgroupstocontrolorinfluencetheactionsofothers,whet
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Othernon-dominantmaleswerehyperactive;theyweremuchmoreactivethanisnormal,chasingothersandfightingeachother.
Ifyouwantto______apleasantvisit,findoutasmuchaspossibleaboutthemannersandcustomsofyourhostcountry.
随机试题
毛泽东首次使用“新民主主义社会”的科学概念是在()。
矩形牙嵌离合器的齿侧是一个___________。
中国共产党领导的多党合作和政治协商制度不是一党制而是多党制。
出血时间延长的临床意义如何?
脘腹冷痛拒按,大便秘结,多见于脘腹冷痛喜按,大便溏软,多见于
地质勘察报告应包括工程地点的()背景资料。
会计职业道德与会计法律制度有着共同的目标、相同的调整对象、承担着共同的职责,但其地位不能互相转化。
关于质押率的确定,下列说法错误的是()。
在击溃国民党的全面进攻和重点进攻中,人民解放军的主要作战目标是()。
下列用户XUEJY的电子邮件地址中,正确的是
最新回复
(
0
)