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
Please Fasten Your Seatbelts Severe turbulence(湍流)can kill aircraft passengers. Now, in test flights over the Rocky Mountain
Please Fasten Your Seatbelts Severe turbulence(湍流)can kill aircraft passengers. Now, in test flights over the Rocky Mountain
admin
2015-07-04
58
问题
Please Fasten Your Seatbelts
Severe turbulence(湍流)can kill aircraft passengers. Now, in test flights over the Rocky Mountains, NASA(美国航空航天局)engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl(用力抛出去)passengers about the cabin. In December 1997, one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However, passengers can avoid serious injury by fastening their seatbelts. "It is the only antidote(对策)for this sort of thing, " says Rod Bogue, project manager at NASA’s Dryden Flight Research Center in Edwards, California.
The centre’s new turbulence detector is based on lidar, or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect. The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air, the speed equals the plane’s airspeed. But as the particles swirl(打漩)in rough air, their speed of approach increases or decreases rapidly. The rate of change in speed corresponds to the severity(激烈程度)of the turbulence.
In a series of tests that began last month, a research jet flew repeatedly into disturbed air over the mountain ridges(山脉)near Pueblo, Colorado. The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had "a comfortable amount of time" to fasten his seatbelt. The researchers are planning to improve the lidar’s range with a more powerful beam. The system could be installed on commercial aircraft in the next few years.
In December 1997, a United Airlines flight hit unexpected rough air, ______.
选项
A、causing a lot of damage to the plane
B、throwing its passengers out of the cabin
C、resulting in heavy casualties
D、forcing the pilot to make an emergency landing
答案
C
解析
该题问的是1997年12月联合航空公司的一架班机在碰到这种气流后,遭遇了什么结果?原文讲到造成一人死亡,多人受伤,据此判断,损失惨重,故选C。
转载请注明原文地址:https://kaotiyun.com/show/ksLd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
AforyoungerandolderpeopleBtotheproperfunctionofyourmemoryCiscalledlong-termmemoryDthecapacitytostorewhat
AthatmaycauseourbloodvesselstobecomemoreandmorenarrowBforpregnantwomentotakeduringtheirlastsixmonthsofp
HowDeafnessMakesItEasiertoHearMostpeoplethinkofBeethoven’shearinglossasanobstacletocomposingmusic.Howev
Sheperseveredinherideasdespiteobviousobjectionsraisedbyfriends.
CannedFoods:ConvenienceandNutritionMeetingyourfamily’snutritionalneedsmayseemdifficultconsideringtoday’sbusyl
CannedFoods:ConvenienceandNutritionMeetingyourfamily’snutritionalneedsmayseemdifficultconsideringtoday’sbusyl
AKeepingGoodRelationswithLocalBusinessmenBServiceProvidedbyLocalNewspapersCLargeCirculationoftheNationalNe
A.ColorfulLifeonCampusB.IntelligentStudentBodyC.ExcellentAdministrationD.DistinguishedFacultyE.SubstantialFinancial
LookingtotheFuture—2040Doyouforgettoturnoffthelightsandheaterswhenyougooutofaroom?In2040itwillnot
Thetomatojuiceleftabrownstainonthefrontofmyjacket.
随机试题
教育方针
下列何组检查结果,符合无排卵周期
唇腭裂可给患者造成
【背景资料】某河道疏浚工程批复投资1500万元,项目法人按照《水利水电工程标准施工招标文件》编制了施工招标文件,招标文件规定不允许联合体招标。某投标人递交的招标文件部分内容如下:(1)招标文件由投标函及附录、授权委托书(合法定代表人证明文件)、项目管理
教师职业道德区别于其他职业道德的显著标志就是为人师表。()
电视:节目
国体和政体的关系在于()。
相关系数的取值可以是()
黑盒测试是通过软件的外部表现来发现软件缺陷和错误的测试方法,具体地说,黑盒测试用例设计技术包括(42)等。现有一个处理单价为1元的盒装饮料的自动售货机软件,若投入1元币,按下“可乐”、“雪碧”或“红茶”按钮,相应的饮料就送出来,若投入的是2元币,在送出饮料
WWW采用客户机/服务器工作模式。WWW服务以()为基础,为用户提供界面一致的信息浏览系统。
最新回复
(
0
)