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
62
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
态度与品德的形成过程不包括()。
依法治国是党治理国家的基本方略,民主执政是中国共产党执政的基本方式。()
Mostpeoplefeellonelysometimes,butitusuallyonlylastsbetweenafewminutesandafewhours.Thiskindoflonelinessisn
Afannercarelesslylostanexpensivegoldwatchinthebarnonthefarm,wherehesearchedforeverywherebutinvain.
Solongasteachersfailtodistinguishbetweenteachingandlearning,theywillcontinuetoundertaketodoforchildrenthatw
Europe’sworldstatushaddrasticallychanged.Itsindividualnations,oncegreatpowers,weredwarfed—politicallyandmilitaril
Yourfriendreallyoughttomake____________mostofthisopportunity,becauseshewon’tget____________secondchance.
Haveyoueverfeltstressed?What’syourstress?WriteacompositioninEnglishabouthowyourstressimpactsonyouandhowyou
Agoodreaderisverymuchlikeadriver.Hemustchangehisreadingspeedtofithispurposeandthematerialheisreading,ju
ManyChinesestudentsthinksciencesubjectsare______foreignlanguages.
随机试题
集中型配送网络是指在配送系统中只设一个配送中心,所有用户需要的物品均由这个配送中心完成配送任务。()
食用菌是指可供食用的大型真菌的子实体。()
简述打包的含义。
案例F公司为从事粮油转运、储存、贸易的工贸企业,拥有专用的粮油码头,现有从业人员980人,其中有来自G公司的劳务派遣人员230人。F公司有专职安全生产管理人员8人。F公司现有:60×104t立筒仓1组,10×104t平房仓1组,10×104t食
某水闸加固改造工程土建标共有甲、乙、丙、丁(其中丁为戊单位与戌单位组成的联合体)四家潜在投标人购买了资格预审文件,经审查乙、丙、丁三个投标人通过了资格预审,那么可以参加该土建标投标的单位包括()等。
甲公司和乙公司采用的会计政策和会计期间相同,甲公司和乙公司2016年至2017年有关长期股权投资及其内部交易或事项如下:资料一:2018年度资料①1月1日,甲公司以银行存款18400万元自非关联方购入乙公司80%有表决权的股份。交易前,甲公司不持有乙公
从事生产、经营的纳税人的财务会计制度或者财务会计处理方法与国务院或者国务院财政、税务主管部门有关税收的规定抵触的,依照国务院或者国务院财政、税务主管部门有关税收的规定计算纳税。()
A注册会计师负责对甲公司2011年度财务报表进行审计。在实施控制测试时,A注册会计师遇到下列事项,请代为作出正确的专业判断。在根据控制测试目的确定控制测试的时间时,A注册会计师应当考虑的主要因素有()。
康塔塔是十七世纪初产生于哪里的一种声乐体裁?
Watchingmepullingthecalfawkwardlytothebarn,theIrishmilkmaidfoughthardto______herlaughter.
最新回复
(
0
)