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、In the air. B、On the airfield. C、Under water. D、At plane manufacturing factory. A
A、In the air. B、On the airfield. C、Under water. D、At plane manufacturing factory. A
admin
2015-02-12
117
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、In the air.
B、On the airfield.
C、Under water.
D、At plane manufacturing factory.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/t5h7777K
0
大学英语六级
相关试题推荐
A、Heshouldn’thaveapologized.B、Hewillfindabetterwayofapologizing.C、Hecouldn’tfindarightwordtomakeanapology.
A、Hemighthelpthewomanmuch.B、Thewomanshouldn’tbuyausedcar.C、Hedoesn’tknowalotaboutnewcars.D、Thewomanisab
Iaskedsuccessfulpeoplewhatthesecretoftheirsuccesswas.I【B1】______anearlydiscussionwithavicepresidentofalarge
A、IceSaws,choppers,axes,tongs,hooks.B、IceAxes,saws,choppers,tongs,hooks.C、Choppers,axes,saws,hooks,tongs.D、Ice
Somepeoplebelievethatyouhavetobeaspecialkindofpersontosellaproduct.Butalthoughitisclearthatasuccessfuls
A、Itisadouble-edgedsword.B、Itisafeatureofagivenculture.C、Itisauniquegiftofhumanbeings.D、Itisaresultofb
A、Theyhavetoobeycertainrulesconcerningstudentconduct.B、Theyhavetodevotemoretimeonacademics.C、Apartmentsarever
ThereisacertaininevitabilitythatebooksaleshavenowovertakenpaperbacksalesonAmazon’sUSsite.Amazon’sKindle2iss
随机试题
变压器温度的测量主要是通过对其油温的测量来实现的。如果发现油温较平时相同负载和相同条件下高出10℃时,应考虑变压器内发生了故障。 ()
a.thatmustbedoneb.anactiontakenagainstsomeoneinaccordancewiththelawc.aninsurerwhoiswell-knowninaparticul
患者,女性,24岁,已婚。因反复发作口腔溃疡3年、外阴溃烂3周余就诊。一年前曾患“结膜炎”,已治愈。无结核史,否认婚外冶游史。查体:上下唇黏膜、齿龈见数个米粒大小散在表浅性溃疡、周围红晕。背部见多个毛囊性炎性丘疹、丘疱疹及小结节。双侧小阴唇潮红、各见两枚绿
血沉减慢可见于
吊装方案的主要内容有()。
Shipping agents will( )the goods to be shipped.
企业采用类比法制订生产控制标准的依据有()。
某学生精力旺盛,争强好胜,做事勇敢果断,为人热情直率,其气质类型为多血质。()
亚洲国家躲过了近年来的全球大萧条,其中最主要的原因是它未被卷入2008年金融危机。然而近日一项调查显示,亚洲的债务水平正在以可怕的速度增长。从某些方面来说,这有部分合理理由,许多国家的超低息政策鼓励贷款,债务增长是财富增长的自然产物。但值得警惕的是,亚洲国
(think)______itover,hedecidedtogiveitup.
最新回复
(
0
)