首页
登录
职称英语
[originaltext] Before a new airliner goes into service, every part of it is
[originaltext] Before a new airliner goes into service, every part of it is
游客
2023-08-22
12
管理
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://tihaiku.com/zcyy/2948288.html
相关试题推荐
[originaltext]Themodernsailingshipwasdevelopedbyamanwhoneverwent
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]Hello,IamHaroldSmith.AstheeditoroftheVoice,I’dlik
[originaltext]Hello,IamHaroldSmith.AstheeditoroftheVoice,I’dlik
[originaltext]Hello,IamHaroldSmith.AstheeditoroftheVoice,I’dlik
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Hi,John.Howarethingsgoing?M:Oh,hi.Fine.Howaboutyo
[originaltext]W:Hi,John.Howarethingsgoing?M:Oh,hi.Fine.Howaboutyo
[originaltext]W:I’dappreciateyourprofessionalopinion.DoyouthinkthatI
随机试题
Recently,theUnitedNationsscientificpanelstudyingclimatechangedeclar
[originaltext]Ifyou’vebeenoncampusforverylong,I’mcertainthatyo
外观质量达到合格的聚氯乙烯防水卷材,在距端部300mm处裁取约3m长的卷材进行封
土的残余抗剪强度参数可通过()试验来测定。A.直接剪切 B.固结快剪 C
本底灰雾是由A.起始点密度与片基灰雾组成 B.乳剂灰雾与片基灰雾组成 C.最
我国流行的肾综合征出血热病毒是A.鼠平型和田鼠型 B.野鼠型和鹿鼠型 C.野
在美术课堂教学中,如果某学生发生问题行为,作为一名教师,下列措施不恰当的是(
肝脏中维生素B6由上述哪些维生素转化而来A.FADB.NAD+及NADP+C.辅
能够改变收益性物业潜在毛租金收入的因素有( )。A.空置面积 B.租金水平
该求助者出现心理问题的关键点是( )。A.缺少挫折经历 B.工作挫折 C.
最新回复
(
0
)