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
74
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、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
回答目的题。这可从说话人对tank test的叙述中得出答案。说话人说:“Engineers can discover which part of the plane cracked. This part is made stronger.”这显然说明答案应为D。
转载请注明原文地址:https://kaotiyun.com/show/0NJd777K
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
A、Specialpaths.B、Resurfacedhighways.C、Moreparkingspace.D、Betterstreetlighting.A
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
WhichofthefollowingiscoveredinBCDInternationalprograms?
Theworld’stropicalrainforestscomprisesome6%oftheEarth’slandareaandcontainmorethanhalfofallknownlifeforms,o
Everyoneofuslivesandworksonasmallpartoftheearth’ssurface,movesinasmallcircle,andoftheseacquaintancesknows
GoldwasdiscoveredinCalifornia______.
随机试题
A.安神定志丸B.酸枣仁汤C.琥珀多寐丸D.交泰丸E.养心汤(1992年第97,98题)病后血虚肝热而不寐者,治宜选用()
8个月女婴,体检发现方颅,肋串珠。实验室检查:血磷降低,血清碱性磷酸酶升高。最可能的诊断是
护士为长期卧床的患者做背部护理,此时护士的角色是
半夏、天南星同源于天南星科植物而辛温有毒,均能燥湿化痰,消肿散结。其中,半夏主入脾、胃经,温燥之性弱于天南星。天南星主归肝经,温燥之性强于半夏。天南星的功效是
有关主诉的描述,下列错误的是()。
Windows操作系统中,启动程序或窗口,只要()对象的图表即可。
题19—21:某车间内设有一台电动葫芦,其轨道梁吊挂于钢梁AB下。钢梁两端连接于厂房框架柱上,计算跨度L=7000mm,计算简图如图1-6所示。钢材采用Q235-B钢,钢梁选用热轧H型钢HN400×200×8×13,其截面特性:A=83.37×102mm2
本单位的财务报表应当按照规定的对象,向()提供。
某工厂为检查流水线生产的产品质量,每隔4小时,抽取5分钟生产的全部产品进行检查。这种抽样方式属于()。
(演示文稿题)第十二届全国人民代表大会第三次会议政府工作报告中看点众多,精彩纷呈。为了更好地宣传大会精神,新闻编辑小王需制作一个演示文稿,素材放于考生文件夹下的“.PPT’素材.docx”及相关图片文件,具体要求如下:除标题幻灯片外,在其他幻灯片的页脚
最新回复
(
0
)