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
Until men invented ways of staying underwater for more than a few minutes, the wonders of the world below the surface of the sea
Until men invented ways of staying underwater for more than a few minutes, the wonders of the world below the surface of the sea
admin
2015-01-26
68
问题
Until men invented ways of staying underwater for more than a few minutes, the wonders of the world below the surface of the sea were almost unknown. The main problem, of course, lies in air. How could air be supplied to swimmers below the surface of the sea? Pictures made about 2, 900 years ago in Asia show men swimming under the surface with air bags tied to their bodies. A pipe from the bag carried air into the swimmer’s mourn. But little progress was achieved in the invention of diving devices until about 1490, when the famous Italian painter, Leonardo da Vinci, designed a complete diving suit.
In 1680, an Italian professor invented a large air bag with a glass window to be worn over the diver’s head. To "clean" the air a breathing pipe went from the air bag, through another bag to remove moisture, and then again to the large air bag. The plan did not work, but it gave later inventors the idea of moving air around in diving devices.
In 1819, a German, Augustus Siebe, developed a way of forcing air into the head-covering by a machine operated above the water. Finally, in 1837, he invented the " hard-hat suit" was to be used for nearly a century. It had a metal covering for the head and an air pipe attached to a machine above the water. It also had small openings to remove unwanted air. But mere were two dangers to the diver inside the " hard-hat suit". One was the sudden rise to the surface, caused by a too great supply of air. The other was me crushing of the body, caused by a sudden diving into deep water. The sudden rise to the surface could kill me diver; a sudden dive could force his body up into the helmet, which could also result in death.
Gradually the "hard-hat suit" was improved so mat the diver could be given a constant supply of air. The diver could men move around under me ocean without worrying about the air supply.
During the 1940s diving underwater without a special suit became popular. Instead, divers used a breaming device and a small covering made of rubber and glass over parts of the face. To improve the swimmer’s speed another new invention was used: a piece of rubber shaped like a giant foot, which was attached to each of me diver’s own feet. The manufacture of rubber breathing pipes made it possible for divers to float on the surface of the water, observing the marine life underneam them. A special rubber suit enabled them to stay in cold water for long periods, collecting specimens of animal and vegetable life mat had never been obtained in the past.
The most important advance, however, was the invention of a self-contained underwater breathing apparatus, which is called a " sucba".
Invented by two Frenchmen, Jacques Cousteau and Emile Gagnan, the scuba consists of a mouthpiece joined to one or two tanks of compressed air which are attached to me diver’s back.
The scuba makes it possible for a diver-scientist to work 200 feet underwater or even deeper for several hours. As a result, scientists can now move around freely at great depths, learning about me wonders of the sea.
The word "seuba" is
选项
A、a certain diver’s name.
B、an original English word.
C、named by the inventor.
D、an acronym.
答案
D
解析
事实细节题。定位在文章倒数第二段,由此可知scuba是self-contained underwater breathingapparatus的首字母缩略词,即acronym。故答案为D。
转载请注明原文地址:https://kaotiyun.com/show/FRLO777K
0
考博英语
相关试题推荐
Oneofthebasiccharacteristicsofcapitalismistheprivateownershipofthemajormeansofproduction—capital.Theownership
Oneofthebasiccharacteristicsofcapitalismistheprivateownershipofthemajormeansofproduction—capital.Theownership
Recentlyscientistshavebeen【1】andperfectingothersourcesofenergy:nuclearoratomicpower,solar(sun)power,andsynthetic(
Alwaysatthebeginningofanyparticularhunttherewasonesolemnceremonytoperform:anearnestconsultationbetweenallthe
Imagineaworldinwhichtherewassuddenlynoemotion—aworldinwhichhumanbeingscouldfeelnoloveorhappiness,noterror
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
Ananestheticisanythingthatproducesatemporarylossoffeelinginallorpartofthebody.Anestheticsaregiventothosea
(中国矿业大学2006年试题)Generally,acomputerisanydevicethatcanperformnumericalcalculations.Currently,【1】,thetermusually
(中国矿业大学2006年试题)Generally,acomputerisanydevicethatcanperformnumericalcalculations.Currently,【1】,thetermusually
Manypeoplebelievetheglarefromsnowcausessnowblindness.Yet,darkglassesornottheyfindthemselvessufferingfromhead
随机试题
女性,24岁,1d前进食不洁食物后腹痛,为阵发性,恶心,呕吐,腹泻。查体:体温38℃。该患者可能出现的体征是
患者男,46岁。出现血尿。首先应考虑
女性,60岁。右肩背部肿痛5天。查体:体温39.4℃,右肩背部有多个脓栓,中央部坏死呈火山口状,最有效的处理措施是
对框架结构作抗震变形验算时,下列概念何者为正确?
日平均浓度的计算方法有保证率法,典型日法,换算法等,其中常用的为( )。
工程项目()的复杂性是指工程项目建设周期长,期间国际国内政治局势、社会、经济、法律、文化方面可能发生变化。
远期利率协议交易中,若参照利率为5.37%,协议利率为5.36%,利息支付天数为90天,假定天数基数为360天,铝义借贷本金为1000万元,则现金结算额为()元。
根据会计法律制度的规定,持证人员从事会计工作,应当自从事会计工作之日起( )内,到单位所在地的会计从业资格管理机构办理注册登记。
仔细观察自然是发现的开端,是认识事物奥秘的向导,我们要注意观察自然界的各种事物、各种现象,注意大自然偶然疏忽留下的破绽,通过对这些________的观察,追根寻源,让大自然________出各种深藏的秘密。我们要以大自然为师,以自然之道来认识自然、适应自然
某公司三名销售人员2011年的销售业绩如下:甲的销售额是乙和丙销售额的1.5倍,甲和乙的销售额是丙的销售额的5倍,已知乙的销售额是56万元,问甲的销售额是()。
最新回复
(
0
)