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
71
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
A、Specialpaths.B、Resurfacedhighways.C、Moreparkingspace.D、Betterstreetlighting.A
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Themostobviouspurposeofadvertisingistoinformtheconsumerofavailableproductsorservices.Thesecond【C1】______isto
Whenwerethefirstx-raysdiscovered?
In1971therewereabout3,700millionpeopleintheworld.Ifthepopulationwere【C1】______evenlyovertheearth’ssurfacet
随机试题
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebasis
患者王某,男,18岁。20余天前开始出现颜面、双下肢浮肿,伴乏力,排泡沫样尿,尿量正常。起病以来体重增加5kg。体检:体温37.2℃,脉搏78次/分,呼吸20次/分,血压120/80mmHg;神志清楚,自主体位,颜面及双下肢凹陷性水肿。实验室检查:尿液检查
家中有气管造口的患者时,应控制居室内空气的湿度,其适宜的湿度范围为
A.肠出血B.肠穿孔C.中毒性心肌炎D.支气管肺炎E.中毒性肝炎
患者,女,59岁。两膝关节红肿热痛,尤以右膝部为重,痛不可触,关节活动不利,并见身热,口渴,舌苔黄燥,脉滑数。治疗除选用犊鼻、梁丘、阳陵泉、膝阳关外,还应加( )。
患者,女性,32岁,拔下颌牙后出现渐进性张口受限,下颌下淋巴结肿大,除下颌升支后缘稍丰满压痛外,其他没有明显体征,最可能的诊断是
可出现周围性发绀的疾病是
机械加压送风和机械排烟的风速,应符合的要求是()。
随着社会的不断发展,行业间相互依赖日趋紧密,但彼此间的商业关系却因竞争激烈而变化无常。永恒的信任不复存在,新的损失风险也不断增加。因此,风险研究管理已成为企业的重要工作的一部分。常用的风险控制措施有()。
【B1】【B7】
最新回复
(
0
)