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
公务员
The first hot air balloon was made by two French brothers, Joseph and Etienne de Montgolfier. Both brothers worked in the family
The first hot air balloon was made by two French brothers, Joseph and Etienne de Montgolfier. Both brothers worked in the family
admin
2018-06-09
65
问题
The first hot air balloon was made by two French brothers, Joseph and Etienne de Montgolfier. Both brothers worked in the family business, which was paper manufacturing. The study of flight interested them, and they soon started experiments in this area.
Joseph was the first to work on hot air balloons, in 1771. He noticed that, when certain gases were burned, it caused materials to rise. Later, Etienne worked with him. At last, they practised with paper bags. They found that hydrogen gas particularly good for this purpose.
On 4 June, 1783, they produced a linen and paper balloon in the shape of a sphere about 100 meters in diameter. The balloon had an opening to receive the heated air rising from a fire of burning wool and wet straw on the ground. There were some fireproof materials inside the bag to prevent it catching fire. The balloon rose into the air to a height of 2000 meters, and stayed there for about 10 minutes. The only problem with this experiment was terrible smell from the fire of wool and straw!
Encouraged by this success, the de Montgolfier brothers made a new balloon for passengers. The brothers put a sheep, a duck and a cockerel in it to test it for safety. On 19 September, 1783, the balloon took off from the King of France’ s palace at Versailles(凡尔赛宫). The flight was a success. The animal travelled over three kilometers before landing in a forest. On 21 November of the same year, the brothers launches another balloon. This time, there were passengers on board, a scientist, Jean Pilate de Rozier, and a nobleman, the Marquis d’ Arlandes. The hot air balloon flew for 25minutes over the city of Paris before landing safely. A new means of transport was bom!
Why was the brothers’ invention called a "hot air" balloon?______________________
选项
答案
Because it can fly rely on the heated air.
解析
由文章第二段第二句话“when certain gases were burned,it caused materials to rise”可知,当一定的气体燃烧(加热)时,可以引起某些材料的上升。而“热气球”就是利用加热气体的原理,使之飞行的,因此叫作“hot air”balloon。
转载请注明原文地址:https://kaotiyun.com/show/D2dq777K
本试题收录于:
中学英语题库特岗教师招聘分类
0
中学英语
特岗教师招聘
相关试题推荐
一定条件下,制约教育性质和发展方向的最直接的社会因素是政治经济制度。()
学习策略是学习者制订的学习计划,由()构成。
“不忘初心、继续前进”体现了一个负责任的大国执政党所具有的危机感、使命感和责任感。坚持“不忘初心、继续前进”,就要坚信党的根基在人民、党的力量在人民,这是因为()
Directions:Inthispart,youaretowriteacompositionwithMyviewonJob-hopping(跳槽)asitstitle.Yourcompositionshould
In1974,afterfillingoutfiftyapplications,goingthroughfourinterviews,andwinningoneoffer,ItookwhatIcouldget—at
Myparentsbeganto____________asmallsumofmoneyeverymonthformycollegeeducationwhenIwasstillachild.
Afamousteacherwasspeakingtothestudentsatourschool.Hebeganhislessonbyholdingupa¥100bill.Thenhesaidtothe
USresearchershavefoundtracesofanancientlakeonMarsrecently,increasinghopesofdiscoveringevidencethatbillionsof
A7-year-oldboyfromTennesseeisbeinghailed(称赞)aheroafterhesavedhisbabysisterfroma【C1】________thatdestroyedthei
A7-year-oldboyfromTennesseeisbeinghailed(称赞)aheroafterhesavedhisbabysisterfroma【C1】________thatdestroyedthei
随机试题
提高财务杠杆会影响公司的业绩表现,因为()。
请根据图示网络结构回答问题。如果图中防火墙FW为CiseoPIX525,并且部分内网需要访问外网,需要使用的两个配置命令依次是___________和________。
非支付性电子商务是指
能屈肘关节的肌是
A、牙冠或牙根形成之后B、埋伏牙C、根尖肉芽肿D、牙板残余E、成釉器发育的早期;与下列囊肿发生有关的是角化囊肿
A.浅表性胃炎B.胃窦溃疡C.胃窦癌D.十二指肠球部溃疡E.胰源性溃疡毕Ⅰ式胃大部切除术适用于()
开发未确定土地使用权的国有荒山、荒地、荒滩从事种植业、林业、畜牧业或渔业生产的,经县级以上人民政府批准,可以确定给开发单位或者个人长期使用,使用期限最长不得超过()年。
处于基坑降水阶段的工地,宜优先采用()作为混凝土搅拌用水、养护用水、冲洗用水和部分生活用水。
检查软件产品是否符合需求定义的过程称为______。
A、CameroonisinWestAfrica.B、Cameroonisdividedbythreereligionswhichcompetefortheloyaltyofthe8millionpeople.C、
最新回复
(
0
)