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
What is the purpose of the tank test?
What is the purpose of the tank test?
admin
2010-06-30
31
问题
What is the purpose of the tank test?
Before a new airliner goes into service, every part of it is tested again and again. But there are more important than all 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 usually flies 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, and 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.
选项
A、In the air.
B、On the airfield.
C、Under water.
D、At the plane manufacturing factory.
答案
A
解析
细节题,这个问题的答案见于“The more dangerous test happens when the new plane goes through test flights in the air.”这句话中,故选A。
转载请注明原文地址:https://kaotiyun.com/show/gNJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Miserabilists’fearofchange:idealists’hopeforabetterworld:anall-purposeadultnostalgiaforlostyouth:allthesethin
Miserabilists’fearofchange:idealists’hopeforabetterworld:anall-purposeadultnostalgiaforlostyouth:allthesethin
Miserabilists’fearofchange:idealists’hopeforabetterworld:anall-purposeadultnostalgiaforlostyouth:allthesethin
Miserabilists’fearofchange:idealists’hopeforabetterworld:anall-purposeadultnostalgiaforlostyouth:allthesethin
WhichofthefollowingiscoveredinBCDInternationalprograms?
Theworld’stropicalrainforestscomprisesome6%oftheEarth’slandareaandcontainmorethanhalfofallknownlifeforms,o
GoldwasdiscoveredinCalifornia______.
In1971therewereabout3,700millionpeopleintheworld.Ifthepopulationwere【C1】______evenlyovertheearth’ssurfacet
随机试题
国民经济账户的基本结构包括()
某药物按照一级降解方式降解,若测得该药物在25℃时,降解速率常数为0.02108/h,则其有效期为()。
污染者付费的原则,通常又称为()的原则,其基本思想是明确治理污染、保护环境的经济责任。
有防水要求的建筑地面工程,铺设前必须对()进行密封处理。
中国共产党在民主革命中战胜敌人的三大法宝是()。
根据以下资料,回答下列题。2013年全年,某市农业总产值412.36亿元,增长3.8%,其中,种植业产值217.16亿元,增长4.4%;林业产值3.09亿元,增长2.8%;畜牧业产值108.63亿元,增长2.4%,渔业产值73.20亿元,增长5.
Whereonestageofchilddevelopmenthasbeenleftout,ornotsufficientlyexperienced,thechildmayhavetogobackandcaptu
研究人员将角膜感觉神经断裂的兔子分为两组:实验组和对照组。他们给实验组兔子注射一种从土壤霉菌中提取的化合物。3周后检查发现,实验组兔子的角膜感觉神经已经复合;而对照组兔子未注射这种化合物,其角膜感觉神经都没有复合。研究人员由此得出结论:该化合物可以使兔子断
(1)在考生文件夹下有一个工程文件sjt3.vbp。窗体Form1上有两个标题分别是“读数据”和“查找”的命令按钮。请画1个名称为Text1、初始值为空的文木框,该文本框允许显示多行内容,且有垂直滚动条,如图所示。程序功能如下。①在考生文件夹下的
"Theworld’senvironmentissurprisinglyhealthy.Discuss."Ifthatwereanexaminationtopic,moststudentswouldtearitapart
最新回复
(
0
)