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
Before a new type of airplane goes into service, every part of it is tested again and again. But there are two teas that are mor
Before a new type of airplane goes into service, every part of it is tested again and again. But there are two teas that are mor
admin
2009-02-15
43
问题
Before a new type of airplane goes into service, every part of it is tested again and again. But there are two teas that are more important than all the others.
The first is called the "tank test". A modem airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure (结构)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 inside. The pressure (压力) on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is high up in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has broken. Then that part is made stronger.
The most dangerous test happens when the new plane is going through test flights in the air. The test pilot must find out exactly what happens when tile engines (发动机) are all shut off at once. 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、the amount of air in the plane
B、the strength of the plane structure
C、the pressure inside and outside the plane
D、the power of the airplane engines
答案
B
解析
文中第二段都在讲如何进行"tank test","strong…pressure…the structure of the plane…stronger…"这些关键词暗示该测试可以测出飞机结构的牢固程度,所以[B]为正确选项。
转载请注明原文地址:https://kaotiyun.com/show/e5Ad777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
SMS(ShortMessageService)graduallybecomesthemainserviceforcellphoneusersforitsgreatcharming.Inaddition,thedevel
Whatdidn’tthemanknowbeforehecomestobuythebook?
Whatdidn’tthemanknowbeforehecomestobuythebook?
Flyingoveradesertareainanairplane,twoscientistslookeddownwithtrainedeyesattreesandbushes.Afteranhour’sflig
Whatdoesthespeakermainlytalkingabout?
Whatdoesthespeakermainlytalkingabout?
Whatisthemanmainlytalkingabout?
Whatisthemanmainlytalkingabout?
随机试题
比例原则是侦查的基本原则之一,其含义是指侦查权在侵犯公民权利时,必须在法律规定范围内选择侵害公民权利最小的方式。下列法条中,哪一条的规定充分体现了比例原则?()
幼女硬化性苔藓最常用的治疗是
局部红肿热痛,突起根浅,肿势局限,范围在3cm左右,易脓、易溃、易敛之病是()
A、KIRB、KARC、TCRD、MBLE、CEA可结合抗原的是
甲公司是一家上海证券交易所上市的有色金属公司。2009年,受全球金融危机影响,该公司亏损46.5亿元。再加上公司产品市场需求持续疲软,不断下降的产品价格与成本形成了严重倒挂,公司的前景进入最为艰难的时期。为此,甲公司选择出售旗下9家主业为铝加工的亏损子公司
根据《合伙企业法》的规定,普通合伙企业在下列事项中,应当由全体合伙人协商一致方能通过的有()。
劳动者与雇主之间存在的对立关系表现为劳动者与雇主之间有()。
奶奶有6颗口味各不相同的糖,现分给3个孙子,其中1人得1颗,1人得2颗,1人得3颗,则共有()种分法。
清人薛允升在《唐明律合编》中说:“贼盗及有关币帑钱粮等事,明律则又较唐律为重”;“大抵事关典礼及风俗教化等事,唐律均较明律为重。”请根据这段文字,分析说明《明律》在刑罚适用原则方面的特点。
请根据下图所示网络结构回答下列问题。如果将172.16.33.128/25划分3个子网,其中第一个子网能容纳35台主机,另外两个子网分别能容纳15台主机,第三个子网掩码为_______,可用的IP地址段为______。(注:IP地址段的起始地址和结束
最新回复
(
0
)