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 pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must us
A pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must us
admin
2011-01-13
51
问题
A pilot cannot fly a plane by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300, 000 kilometers in one second. A radar set sends out a short burst of radio waves: Then it receives the echoes produced when the waves bounce off objects. By determining the time it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word "radar," in fact, gets its name from the term "radio detection and ranging." "Ranging" is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms.
What might be inferred about radar?
选项
A、It takes the place of a radio.
B、It gave birth to the invention of the airplane.
C、It developed from a study of sound waves.
D、It has improved navigational safety.
答案
D
解析
推断题型见本文第二句:In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. (在许多情况下,如夜间飞行、在浓雾中降落;飞行员必须使用雷达——一种航行用的替代方法);由此可推断雷达的使用除了使航行更为准确、弥补人类飞行员的不足之外,更重要的是它使得航行更为安全,因此选项D为答案。
转载请注明原文地址:https://kaotiyun.com/show/qy5O777K
本试题收录于:
CATTI三级笔译综合能力题库翻译专业资格(CATTI)分类
0
CATTI三级笔译综合能力
翻译专业资格(CATTI)
相关试题推荐
A、Shedoesn’tthinkthatshelookslikethestudent.B、Manyofherstudentslookalike.C、Sheisn’trelatedtothestudent.D、He
A、Settlementpatternsindesert.B、Causesofdesertification.C、Plantadaptationtodesertconditions:D、Regionsmostaffectedb
Thefoodandwaterthatpeople(consumethem)comefromtheenvironment,(provided)eitherbynature(orthrough)theworkoffa
Psychoanalysisisaformoftherapy(thatattempts)(toeliminate)conflict(byalter)thepersonality(ina)positiveway.
A、Thelanguagetheyarewritteninisnotwidelyknown.B、TheycannotbemovedfromwheretheywerefoundC、Thewritinginthem
A、ByflyingincirclesaroundafieldB、BydetectingachemicalsignalC、ByinspectingindividualcornleavesD、Bynoticingthe
OvercomingtheLanguageBarrierThediscoverythatlanguagecanbeabarriertocommunicationisquicklymadebyallwhotra
Accordingtotheprofessor,whatisautoradiographyabletorevealaboutapaintingthatregularX-rayscannot?
Agoodtranslatorisbydefinitionbilingual.Theoppositeisnot【C1】______tree,however.Abornandbredbilingualwillstilln
Agoodtranslatorisbydefinitionbilingual.Theoppositeisnot【C1】______tree,however.Abornandbredbilingualwillstilln
随机试题
女性,50岁,摔伤两天,左髋部痛。检查:左下肢短缩,外旋500°畸形。全身重要器官无异常表现。最可能诊断
言谈不多,语速较慢,善于克制,注重稳定,具备这种特征的人所属气质类型一般为()。
脑白金——吆喝起中国礼品市场在中国,如果谁提到“今年过节不收礼”,随便一个人都能跟你过不去地说“收礼只收脑白金”。脑白金已经成为中国礼品市场的第一代表。睡眠问题一直是困扰中老年人的难题,因失眠而睡眠不足的人比比皆是。有资料统计,国内至
对求职者的信息掌握较全面,招聘成功率高的员工招聘方式是()
注意可以分为()。
2003年1月22日,公安部发布了加强公安机关内部管理的“五条禁令”。禁令规定,严禁携带枪支饮酒,违者予以( ),造成严重后果的,予以( )。
某年某市“两会”前夕,当地一家媒体就“两会”焦点话题,分别对外来务工人员和城市居民进行了调查,位列前三的分别是:调查结果显示,不同对象所关注的热点不同。这表明()。
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。
Shanghaiisabigcity.Itis______thesoutheastofChina.
中国的现代化建设必须从中国的实际出发。无论是革命还是经济建设,都要注意学习国外经验。但是照搬照抄别国经验、别国模式,我们不能取得成功。中国的事情要按中国的情况来办,要依靠中国人自己的力量来办。无论过去、现在和将来。独立自主、自力更生都是我们的立足点。任何国
最新回复
(
0
)