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
专升本
Before a new airliner goes into service, every part of it is tested again and again. But there are two tests that are more impor
Before a new airliner goes into service, every part of it is tested again and again. But there are two tests that are more impor
admin
2019-05-23
40
问题
Before a new airliner goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others. One of them is very strange and the other is very dangerous.
The first of these is called the"tank test". A modern airliner must fly at very high altitudes. Air must be pumped into the plane so that the passengers can breathe. The metal structure of the plane has to be very strong for this reason. When the plane is filled with air, or"pressured" , the air presses against the skin of the plane inside. The pressure on a small window, for example, is like a huge, giant foot that is trying to get out. If a small part of the plane were to crack, the plane would explode in the sky. This is what happened to the first Comets. In order to test the structure of the plane, it is lowered into a huge tank of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has cracked. This part is made stronger.
The most dangerous test happens when the new plane is going through test flight in the air. The test pilot must find out exactly what happens when all the engines are shut off at once. He takes the plane up very high. Then he shuts the engines off. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.
The test is carried out under water because______.
选项
A、the pressure under water is greater than in the air
B、the first Comets exploded in the water
C、it will be easier for engineers to find out where the crack is
D、that can protect the testers from being injured
答案
C
解析
文中提到“在水中进行测试造成的伤害比任何地方都小”以至于更容易发现问题,故本题选C。
转载请注明原文地址:https://kaotiyun.com/show/cbDC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Itisimportantthatthehotelreceptionist_______thatguestsareregisteredcorrectly.
Doyouwanttoknowsomethingaboutthehistoryofweather?Don’tlookatthesky.Don’tlookforoldweatherreports.Lookinga
We’llhavetocontinuethediscussiontomorrow______wecanmakeafinaldecisiontoday.
________theintroductiontothefilm,Ihadnodesiretogotothecinema.
People’sattitudes【C1】______gift-givingmay【C2】______fromcountrytocountry,【C3】______thedesiretoconveyafeelingoffriend
Accordingtopsychologists(心理学家),anemotionisarousedwhenamanoranimalviewssomethingaseitherbadorgood.Whenapers
AAtseeingBthedamageheChaddone,thechildfeltDashamed.
Thelegallimitfordrivingafterdrinkingis80milligramsofalcoholin100millilitersofbloodintheU.S.whentested.But
ThemistakesAmadebytheChinesestudentsBofEnglishCaredifferentfromDthatbytheJapanesestudents.
ThedistinctivearchitecturalfeatureofthetypicalBroadwaytheateristhejuxtaposition(毗邻)oftwoalmostindependentbuilding
随机试题
登兹楼以四望兮,聊暇日以销忧,览斯宇之所处兮,实显敞而寡仇。挟清漳之通浦兮,倚曲沮之长洲,背坟衍之广陆兮,临皋隰之沃流。北弥陶牧,西接昭丘,华实蔽野,黍稷盈畴。虽信美而非吾土兮,曾何足以少留?这段文字出自哪篇课文?作者是谁?
A.多饮、多食、多尿、消瘦B.乏力、纳差、血压低、皮肤色素黑C.蛋白尿、水肿、高脂、低蛋白血症D.怕热多汗、疲乏无力、急躁易怒E.蛋白尿、血尿、高血压
可能导致财务报表不一定能反映公司的客观实际的因素有( )。
企业保留盈余资金成本的实质是一种()。
在一手房贷款中,在房屋办妥抵押登记前,一般由()承担阶段性保证责任。
企业应支付的各种赔偿不通过“应付账款”核算。()
Disagreementsamongeconomistsarelegendary,butnotontheissueoffreetrade.Arecentsurveyofprominenteconomistsbothc
吕某听到别人说自己漂亮,最可能的症状是()。从测验结果来看,该求助者筛查阳性的因子是()。
中央银行可以主动用于调节外汇市场的手段包括()。
Researchershavestudiedthepoorasindividuals,asfamiliesandhouseholds,asmembersofpoorcommunities,neighborhoodsand
最新回复
(
0
)