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、To find out how much air can be pumped into a plane. B、To find out how much air passengers need to breathe at certain altitude
A、To find out how much air can be pumped into a plane. B、To find out how much air passengers need to breathe at certain altitude
admin
2015-02-12
80
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, the air presses against the skin of the plane. 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 doesn’t cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane cracked. This part is made stronger.
The most dangerous test happens when the new plane goes through test flights in the air. The test pilot must find out exactly what happens when the engines are shut off suddenly. He takes the plane up very high. Then he shut 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.
Questions 22 to 25 are based on the passage you have just heard.
22. What is the purpose of the tank test?
23. Why is the tank test carried under water?
24. Where is the second test carried out?
25. What does this speaker mainly talk about?
选项
A、To find out how much air can be pumped into a plane.
B、To find out how much air passengers need to breathe at certain altitudes.
C、To find what would happen if the plane crashed in the water.
D、To find out if there are any weak parts in the plane that would burst under pressure.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/j5h7777K
0
大学英语六级
相关试题推荐
Theevolutionofsexratioshasproduced,inmostplantsandanimalswithseparatesexes,approximatelyequalnumberofmalesan
Iaskedsuccessfulpeoplewhatthesecretoftheirsuccesswas.I【B1】______anearlydiscussionwithavicepresidentofalarge
Iaskedsuccessfulpeoplewhatthesecretoftheirsuccesswas.I【B1】______anearlydiscussionwithavicepresidentofalarge
OnModestyAttentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahum
OnModestyAttentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahum
A、Agoodstrainhitabuscarryingmanypassengers.B、Twopassengertrainscrashedintoeachother.C、Apassengertraincollided
A、Theyhavetoobeycertainrulesconcerningstudentconduct.B、Theyhavetodevotemoretimeonacademics.C、Apartmentsarever
A、Thematerialsforindoorplumbinghavebeenimproved.B、Thehousesrecentlybuiltaremuchmoresolid.C、Peoplewon’tgoanywh
A、Gotothedesignatedareas.B、Askfortheconductor’spermission.C、Sharewithotherpassengers.D、Havesomethingelseinstead
A、IceSaws,choppers,axes,tongs,hooks.B、IceAxes,saws,choppers,tongs,hooks.C、Choppers,axes,saws,hooks,tongs.D、Ice
随机试题
患者,女,32岁。反复腰痛、尿频、尿痛3天。尿常规:白细胞30~40个/HP,红细胞20~30个/HP。中段尿培养有细菌生长。肾B超:双侧肾可见与肾锥体分布一致的强回声团,呈放射状排列,见多个小结石。1年前IVP示:双侧肾见多数囊肿和扩张的小管,肾锥体被造
女,48岁,月经不规律1年,现阴道淋漓出血20多天,伴乏力。患者下列哪种情况绝对不能激素替代治疗
下列()不符合汽车库安全疏散规定。
截面尺寸为370mm×740mm的砖柱,计算高度为5m,采用MU10黏土实心砖、M7.5水泥砂浆砌筑。配筋砖砌体的抗压强度设计值fn=3.20N/mm2,体积配筋率ρ=0.250%,则该砖柱的轴心受压承载力与()项数值最为接近。
影响资金等值的因素有()。
企业价格的制定应主要从()来考虑。
Sofarwehavedonealottobuildalow-carboneconomy,butitis________ideal.Wehavetoworkstillharder.
函数f(χ)=χ3-3χ+k只有一个零点,则k的范围为().
Questions8-13Answerthequestionsbelow.ChooseNOMORETHANTWOWORDSfromthepassageforeachanswer.Writeyouranswersin
Mostparents,Isuppose,havehadtheexperienceofreadingabedtimestorytotheirchildren.Andtheymusthave【B1】______howd
最新回复
(
0
)