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
2023-08-26
65
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、In the air.
B、On the airfield.
C、Under water.
D、At plane manufacturing factory.
答案
A
解析
细节题。文中介绍了最危险的是第二步在空中进行的飞行测验。
转载请注明原文地址:http://tihaiku.com/zcyy/2958069.html
相关试题推荐
[originaltext]Influenza,ortheflu,attacksuptoonebillionpeopleannua
[originaltext]Influenza,ortheflu,attacksuptoonebillionpeopleannua
[originaltext]Atabout8p.m.onJuly6th,eight-year-oldJessewasplayin
[originaltext]Atabout8p.m.onJuly6th,eight-year-oldJessewasplayin
[originaltext]Eatingfoodshighintrans-fatsandsaturatedfatsincreases
[originaltext]Eatingfoodshighintrans-fatsandsaturatedfatsincreases
[originaltext]W:Goodafternoon.LearningSoftware.ThisisRosespeaking,how
[originaltext]W:Goodafternoon.LearningSoftware.ThisisRosespeaking,how
[originaltext]W:Goodafternoon.LearningSoftware.ThisisRosespeaking,how
[originaltext]W:DoyouthinkprofessorMonroewouldletmeinterviewher?Iam
随机试题
WhyisgreenlivingencouragedinlocalcouncilsinBritain?[originaltext]W
Whatisthemaintopicofthetalk?Themaintopicofthistalkistoofferadvi
闭幕词说明:请写一份闭幕词,宣布讨论会闭幕。内容:1.代表组委会的全体成员感谢大家参加讨论会,并促使其成功;2.对大家表示祝
A.含有寡霉素敏感蛋白 B.具有ATP合酶活性 C.结合GDP后发生构象改变
半圆形玻璃砖横截面如图,AB为直径,O点为圆心,在该截面内有a、b两束单色可见光
专业巡视指为深入掌握设备状态,由()联合开展对设备的集中巡查和检测。运维人员$;
四年级学生搬砖,有12人每人各搬7块,有20人每人各搬6块,其余的每人搬5块,这
一般在赔付率与年龄关系不大的条件下多被采用的健康保险费率厘定的基本方法是( )
A公司向B公司购买一批医疗物资,合同金额为600万元。为支付货款,A
(2022年真题)根据英国工程施工合同(ECC)文件,属于次要选项条款的有( )
最新回复
(
0
)