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、When the airplane slows down very quickly. B、When the airplane is making a sharp turn. C、When the pilots have a heart disease.
A、When the airplane slows down very quickly. B、When the airplane is making a sharp turn. C、When the pilots have a heart disease.
admin
2017-04-28
31
问题
(5)While flying high above the earth’s surface, jet fighter pilots may suffer loss of eyesight for brief periods. Some pilots may even lose consciousness—not being able to recognize what is happening around them. These experiences, commonly called "blackouts." can lead to tragic results.
Researchers say two different situations can lead to a pilot’s loss of consciousness. One is "G-LOC" or G-force induced Loss of Consciousness, and the other one is hypoxia, which is lack of oxygen to the brain.(6)G-LOC happens when the airplane is making a sharp turn or speeding up very quickly. During these periods, centrifugal force reduces the normal flow of blood to the pilot’s brain. At high speeds, loss of control of the aircraft has proved deadly for many pilots.(7)Hypoxia, or lack of oxygen, can affect anyone at extreme heights. That is why passenger planes are equipped with oxygen masks. Passengers are always told before flying to put on the masks in case of a sudden loss of air pressure.
5. What is the news report mainly about?
6. When does "G-LOC" usually happen?
7. Why are passenger planes equipped with oxygen masks?
选项
A、When the airplane slows down very quickly.
B、When the airplane is making a sharp turn.
C、When the pilots have a heart disease.
D、When the pilots lose consciousness.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/Lci7777K
0
大学英语四级
相关试题推荐
Forthispart,youareallowed30minutestowriteashortessay.Youshouldstartyouressaywithabriefdescriptionofthepi
Therewasatimewhenanypersonalinformationthatwasgatheredaboutuswastypedonapieceofpaperand【B1】______inafilec
Eatingfruitsandvegetableshasprovedhelpfulinpreventingvariouschronic(慢性的)illnesses.Doesthatmeanthemorethebetter?
AnewstudyfromtheUniversityofNewSouthWaleshasdiscoveredthatduringtheworkingweek,Australianfathersonlyspendan
A、Topreventcaraccidents.B、Tomonitorthedriver’shealth.C、Todrivethecarautomatically.D、Tomeasurethedriver’spulse.
A、Jimmyisnotseriousinmakingdecisions.B、Jimmyisrichenoughtobuyabighouse.C、Jimmy’swordsareoftennotreliable.D
Everybodywantstogetwealthy.Intoday’s【B1】______world,makingmoneyorbecomingwealthysymbolizesaperson’ssuccessandc
"Wehavebeenignoringthebiggestglobalhealththreatofthe21stcentury."Thiswasthemessagespelledoutinareportlaunc
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
随机试题
癫病的临床特征有
自然选择有一定的方向性,这是由于()。
大豆的限制氨基酸和含量相对较高的氨基酸分别是
下列关于手续费及佣金支出的企业所得税税务处理的表述中,正确的有()。
食堂在制作白菜炒肉丝。大米饭。实际该份菜肴用白菜15kg、猪肉2kg、色拉油1kg。炒熟后总重量为22kg。现有一份200g米饭(生熟比0.5),一份白菜炒肉丝(熟重400g),请计算和分析该份餐各种食品的生食进食量。
我们身体的生物钟系统会受到许多因素的影响,其中之一就是光照。研究表明,光照可以有效地欺骗大脑进入“白昼模式”,哪怕当时人的眼睛是闭着的也没关系。研究人员发现可以用光照疗法来帮助我们调整时差,包括持续光照和不同间隔的闪光,而每10秒一次持续仅2毫秒的闪光最有
在测量研究中,将研究分两步走,先进行G研究,然后在G研究基础上进行D研究的心理测量理论是
主张把教育心理学当做一门独立学科的分支进行研究,并提出了“文化发展论”和“内化论”的学者是()
发展是党执政兴国的第一要务,这
A、Takeonedictionaryoutoftheroom.B、Borrowadictionarysomewhereelse.C、Borrowadictionaryfromthelibrary.D、Buyadic
最新回复
(
0
)