网友您好，请在下方输入框内输入要搜索的题目：

搜题

题目内容（请给出正确答案）

提问人：网友bixkjwfnh 发布时间：2022-01-06

[主观题]

Laser-dopple radar is especially valuable in space missions because it ______ .A．is one th

Laser-dopple radar is especially valuable in space missions because it ______ .

A．is one thousand times more precise than microwave radar

B．provides precise measures of the velocity of space vehicles

C．is a new system of radar

D．can measure the movement of a spaceship less accurately than a microwave radar

简答题官方参考答案（由简答题聘请的专业题库老师提供的解答）

查看官方参考答案

更多“Laser-dopple radar is especially valuable in space missions because it ______ .A．is one th”相关的问题

第1题

Implied but not stated ______ .A．Laser-dopple radar is more accurate than microwave radarB

Implied but not stated ______ .

A．Laser-dopple radar is more accurate than microwave radar

B．Microwave radar may not ensure absolute precision in measuring varying speeds

C．The light-beam radar can measure only slow speeds with accuracy

D．Microwave radar operates at a higher frequency than laser-dopple radar

点击查看答案

第2题

Which of the following statements is NOT true according to the passage ______ .A．accuracy

Which of the following statements is NOT true according to the passage ______ .

A．accuracy in speed measurement is essential to spaceships

B．the speeds of space vehicles will vary greatly

C．inaccuracies in measurement could cause accidents in space missions

D．a bump could affect the preciseness of the laser-dopple radar

点击查看答案

第3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 uses microwaves.

The model has shown that this radar system, known as laser-dopple 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-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 of cycles(百万兆) 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.

Laser-dopple radar ______ .

A．measures the movement of a spaceship by means of light beam

B．makes use of microwaves

C．makes use of sound waves

D．both A and B

点击查看答案

第4题

【单选题】Lesson one Text A vocabulary multiple choices-6 During World War I, ____ were used on airplanes to facilitate the communications between pilots and ground commander.

A、Radar systems

B、Radiotelephones

C、VOR frequencies

D、Telephones

点击查看答案

第5题

The basic principle of radar is illustrated by what happens when one shouts in a e. The ec

hoof the shouting 11 the walls helps a person determine the size of i cave. With radar, however , the waves are radio waves instead of 12 waves. dio waves travel 13 the speed of light, about 300,000 kilometers in a second. A lar set 14 a short burst of radio waves. Then it receives the echoes 15 when waves bounce (Silt) off objects. By determining the time it 16 for the echoes to imi to the radar set, a trained technician 17 determine the distance between the [ar set and other objects. The word "radar", 18 , gets its name from the term dio detection and ranging." "Ranging" is the term for detection of the 19 between object and the radar set.

Besides being of critical importance to pilot, radar is 20 for air traffic control, tracking ships at sea, and for tracking weather systems and storms.

11.

A.through

B.for

C.on

D.against

点击查看答案

第6题

Which of the following statements is not true according to the passage ______.A．accuracy i

Which of the following statements is not true according to the passage ______.

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

点击查看答案

第7题

听力原文：M: May I see your license？W: But officer, did I do something wrong？M: Did you see

听力原文：M: May I see your license？

W: But officer, did I do something wrong？

M: Did you see the speed limit sign. It says thirty five miles an hour here.

W: But my speed meter reads only thirty miles.

M: Then why did my radar show you're going forty five.

What is the speed limit in that area？

A．30 miles.

B．35 miles.

C．40 miles.

D．45 miles.

点击查看答案

第8题

How can a SART’s effective range be maximized？______A.The SART should be placed in water i

How can a SART’s effective range be maximized？______

A.The SART should be placed in water immediately upon activation.

B.The SART should be held as high as possible.

C.Switch the SART into the “high” power position.

D.If possible, the SART should be mounted horizontally so that its signal matches that of the searching radar signal.

点击查看答案

第9题

A—adB—AptC—CorpD—IQE—GMT F—WTOG—VOA H—BBCI—CDJ—UFOK—OPECL—UNESCOM—infoN—VIPO—pop P—ROMQ—BC

A—ad B—Apt

C—Corp D—IQ

E—GMT F—WTO

G—VOA H—BBC

I—CD J—UFO

K—OPEC L—UNESCO

M—info N—VIP

O—pop P—ROM

Q—BC R—BS

S—MA T—MBA

U—PE V—radar

51. ()体育 ()重要人物

52. ()不明飞行物 ()格林尼治标准时间

53. ()理学士 ()联合国教科文组织

54. ()智商 ()公寓

55. ()世界贸易组织 ()工商管理硕士

点击查看答案

第10题

听力原文：M: I'm sorry I'm late, Cindy.W: That's all tight, Joe. My house isn't that easy t

听力原文：M: I'm sorry I'm late, Cindy.

W: That's all tight, Joe. My house isn't that easy to find. But you know, you wouldn't have gotten lost if you had a "smart" car.

M: A smart car？ What's that？

W: I just read a magazine article about some new technology that can make a car smart. One device is a computerized map display and a synthesized voice, you must enter the address where you want to go, and the voice tells you how to get there, street by street.

M: Hey, that's just like my brother. He never gets lost, and he's always telling me the best route. So what else will smart cars be able to do？

W: Well, the article said that they'll be equipped with radar warning systems that will warn drivers if they're getting too close to other cars with an alarm signal, and they'll even put on the brakes if the drivers don't.

M: Tell me, Cindy, will these cars be smart enough to fill themselves up with gas？

W: Not that I know of. Why do you ask？

M: Well, I'm late not because I got lost—I'm late because I ran out of gas on the way over here.

(20)

A．From a newspaper advertisement.

B．From a magazine article.

C．From a television program.

D．From an automobile dealer.

点击查看答案

账号：尚未登录

登录没有账号？去注册

搜题记录

联系客服

购买搜题卡

考试指南全部 >

2024年浙江成考改革是否有实锤，是否真实可信（2024年浙江成人高考新政策解读 2024年江苏成考成绩查询时间公布：11月24日 2024年湖北自考本科成绩查询时间表 2024自考本科怎么自己报名网上操作步骤有什么江苏成人高考录取后什么时候开学上课？ 2024年4月陕西自学考试成绩查询入口开通中汉语言文学自考本科考哪几门有什么考试科目成人函授取消倒计时，成考改革即将迎来“大动作” 继续教育的教育优势,，成考学历文凭一般在哪些方面需要用到呢 2024年江苏成人高考学习形式分为函授、业余、脱产三种学习形式有什么不同

购买搜题卡查看答案

购买前请仔细阅读《购买须知》

请选择支付方式

微信支付

支付宝支付

点击支付即表示你同意并接受《服务协议》和《购买须知》

立即支付已付款，但不能查看答案，请点这里登录即可>>

搜题卡使用说明

1. 搜题次数扣减规则：

功能	扣减规则
功能	基础费（查看答案）	加收费（AI功能）
文字搜题、查看答案	1/每题	0/每次
语音搜题、查看答案	1/每题	2/每次
单题拍照识别、查看答案	1/每题	2/每次
整页拍照识别、查看答案	1/每题	5/每次