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
24
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.
The word "it" underlined in Paragraph 1 refers to ______.
选项
A、a radar set
B、a short burst
C、a radion wave
D、light
答案
A
解析
词义题型参见第95题注释,可知“it”在此指前面所提到的“一个雷达装置”;因此A为答案。
转载请注明原文地址:https://kaotiyun.com/show/iy5O777K
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
Whatisthemainideaofthepassage?Whichofthefollowingdoesthepassagementionasnecessaryforboththeproductionofo
A、Thelanguagetheyarewritteninisnotwidelyknown.B、TheycannotbemovedfromwheretheywerefoundC、Thewritinginthem
OrganicArchitectureOneofthemoststrikingpersonalitiesinthedevelopmentofearly-twentiethcenturyarchitecturewasF
OvercomingtheLanguageBarrierThediscoverythatlanguagecanbeabarriertocommunicationisquicklymadebyallwhotra
OvercomingtheLanguageBarrierThediscoverythatlanguagecanbeabarriertocommunicationisquicklymadebyallwhotra
ConversationWhatarethestudentsmainlydiscussing?
"SociologyClass"Inthediscussion,thestudentsidentifyaspectsofgangactivity.Indicatewhethereachofthefollowingis
A、Herhometowndoctorworksatthestudenthealthcenter.B、Shecannothelpthemanchooseadoctor.C、Shedidn’tknowsheneeded
Whatisthemainpurposeofthelecture?Accordingtotheprofessor,whatfactorsmighthavecreatedtheconditionsforasnowb
Agoodtranslatorisbydefinitionbilingual.Theoppositeisnot【C1】______tree,however.Abornandbredbilingualwillstilln
随机试题
Marysaidshe(heard)someoneintheclassroom,(but)whenwelookedwe(didn’tfind)(someone).
多器官功能障碍时胃肠功能代谢改变中下列哪一项不存在
社区护士怀疑患者有自杀念头时,下列护理措施错误的是
判断前列腺增生严重程度的方法是
A、重症肌无力B、青光眼C、有机磷中毒D、去极化肌松药过量中毒E、房室传导阻滞碘解磷定用于()
以下关于可转换债券的说法中,错误的是()。
操作系统主要是对计算机系统中的全部软硬件资源进行管理,以方便用户提高计算机使用效率的一种系统软件。它的主要功能有:(66)、存储管理、文件管理、(67)设备管理。Winndows是一个具有图形界面的(68)系统软件。UNIX操作系统基本上是采用(69)语言
目前有许多不同的音频文件格式,下列哪一种不是数字音频的文件格式()。
A、 B、 C、 B
WhichofthefollowingisNOTamongthecriteriaofthe100mostpowerfulwomenintheworld?
最新回复
(
0
)