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
2016-07-17
59
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/wbLd777K
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
HowTwoGreatConflictsHelpedtoChangeEuropeNinetyyearsagoonasunnymorninginNorthernFrance,somethinghappenedt
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
Thiskindofanimalsareonthevergeofextinction,becausesomanyarebeingkilledfortheirfur.
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CannedFoods:ConvenienceandNutritionMeetingyourfamily’snutritionalneedsmayseemdifficultconsideringtoday’sbusyl
TheproblemfacingBritishsurgeonsintheearly19thcenturywasthatThebodysnatchersusedwoodenshovelsbecause
FamousAmericanFoodsWhat,besideschildren,connectsmothersaroundtheworldandacrosstheseasoftime?It’schicken
Once-dailyPillCouldSimplifyHIVTreatmentBristol-MyersSquibbandGileadScienceshavecombinedmanyHIVdrugsintoasi
Once-dailyPillCouldSimplifyHIVTreatmentBristol-MyersSquibbandGileadScienceshavecombinedmanyHIVdrugsintoasi
随机试题
有关洋地黄中毒的描述,不正确的是
《中华人民共和国药品管理法》规定,A.国务院中医药管理部门B.国务院C.国务院药品监督管理部门会同国务院中医药管理部门D.国务院药品监督管理部门E.国务院药品监督管理部门会同国务院卫生行政部门制定特殊管理药品的管理办法的部门是
根据案例描述,该企业应按加工贸易货物办理相关材料的进口手续。除加工贸易合同外,该企业向海关办理加工贸易合同备案时应提交的主要单证还包括()。该批货物于7月31日向海关申报()。
根据德国税法关于资本利得和投资收益纳税的规定,下列说法错误的是( )。
唐宋两代盛行的一种戏剧表演形式是()。
下列各项中属于作业成本计算法的第一步的是()。
“没有几个国家不存在这种持续的努力,即人口的增长比生活资料的增加更快。这种持续的努力总是倾向于让下层社会承受极端沉重的压力.并阻碍其生存状况发生任何永久性的重大改善。”这段文字最可能反映了谁的观点?
要落实从严治政方针,确保党员干部廉洁从政,必须加强监管,特别是加强对领导干部的监督。这里的监督包括()。
1947年12月,毛泽东指出:“全党必须明白,土地制度的彻底改革,是现阶段中国革命的一项基本任务。如果我们能够普遍地彻底地解决土地问题,我们就获得了足以战胜一切敌人的最基本的条件。”为解决土地问题,我党在此阶段采取的重大举措有()
InMexico,PresidentVicenteFoxismakinganefforttocalmprotestsinthefarmingsectorthroughadialoguewiththegovernme
最新回复
(
0
)