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
Automatic Doors in Egypt When you next step through the doors of a supermarket, spare a thought for Heron, a talented specia
Automatic Doors in Egypt When you next step through the doors of a supermarket, spare a thought for Heron, a talented specia
admin
2012-07-30
42
问题
Automatic Doors in Egypt
When you next step through the doors of a supermarket, spare a thought for Heron, a talented specialist of ancient "high tech" engineering. Nearly two thousand years ago he designed automatically opening doors for the temples of the Egyptian city of Alexandna.
Heron had a talent for designing mechanical wonders to surprise people and make people happy. 46 was a gift to the Egyptian priests, who for centuries had used wonder mechanical or otherwise, as a way of strengthening their authority.
Employing relatively simple mechanical principles, Heron devised a means 47 as if by unseen hands—when the priest lit a fire on the altar outside the temple. The fire heated the air in a metal globe placed beneath the altar , foreign the water in it through a pipe into an enormous bucket. The bucket was suspended by chains from a system of weights and pulleys, which turned the doors on their pivots as the bucket became heavier.
A second surprise took place when the altar fire was put out. 48 , the water was sucked the other way through the pipe. When the bucket emptied, it went upward, making the pulley system move in reverse, and the doors closed again.
Another design included in Heron’s writings could make a trumpet blow when the temple doors opened—a combination of musical doorbell and burglar alarm.
There need be little doubt that the automatic-door system described by Heron was actually used in Egyptian temples and 49 Heron himself referred in passing to a similar system used by other engineers: "Some instead of water use quicksilver (mercury)"Using mercury
50 would certainly have made it more efficient.
A whereby the doors of a small temple would open
B possibly elsewhere in the Greco— Roman(希腊—罗马的)world
C His design for automatic temple doors
D because of the quick heating of the air inside the globe
E instead of water in a machine similar to Heron’s design
F As a result of the sudden cooling of the air in the globe
选项
答案
E
解析
位于"空白50"之前的句子中提及Some instead of water use quicksilver(mercury),而选项E又重复了(Using mercury)instead of water。所以,为“空白50”选E是顺理成章的。
转载请注明原文地址:https://kaotiyun.com/show/2pGd777K
本试题收录于:
职称英语综合类C级题库职称英语分类
0
职称英语综合类C级
职称英语
相关试题推荐
IwilltakeupteachingthisSeptember.
Accordingtothepassage,Coustean’sinfluenceisgreatbecausehe______.Fromthesecondparagraph,weknowthat
"HappyBirthdaytoYou"ThemainproblemindiscussingAmericanpopularcultureisalsooneofitsmaincharacteristics:itwon’
TheAnimalsinDesertSomedesertanimalscansurvivetheverystrongsummerheatanddrynessbecausetheyhaveveryunusual
LocalNewspapersinBritain1.Britainhasalargecirculation(发行量)ofthenationalnewspapers.TheDailyMirrorandTheDaily
ReducePackagingPressureincreasedrecentlyonBritishsupermarketsandretailerstoreducepackagingaspartofananti-wa
BlackHoles Mostscientistsagreethatblackholesexistbutarenearlyimpossibletolocate.Ablackholeintheuniverseis
WarmerClimateWillBakeTropicalBugsGlobalwarmingcouldcooktropicalinsects,withunpredictableknock-oneffects,say
FrancehaskeptintimatelinkswithitsformerAfricanterritories.
HowtoPrepareforanInterviewBeinginterviewedisasituationthatnearlyeveryonefacesatsometimeinlife,whetherfo
随机试题
肝硬化呕血呈咖啡色,其原因是
法院应适用()规定的程序审理恒生家具厂破产案件。在法院受理恒生家具厂的破产案件后,大森林木材加工厂可以采取的救济措施有()。
在规划研究咨询的发展战略目标研究中,管理目标包含:体制改革、机构调整、制度创新以及()等。
2016年《中共中央国务院关于进一步加强城市规划建设管理工作的若干意见》提出用5年左右的时间,完成()划定和历史建筑确定工作。
根据《中华人民共和国合同法》,缔约过失责任的构成要件有()。
某建设项目计划投资额为8000万元,建设期2年,第1年和第2年投资额分别为计划投资额的60%,和40%,预计建设期内价格年上涨率为5%。则该项目建设期涨价预备费为()万元。
测量不确定度可用()表示。
根据材料,回答问题。某位教师,在讲授“拿破仑的文韬武略”时,设计了如下三维教学目标:(1)知识与能力目标讲述拿破仑的主要活动,评价《拿破仑法典》,评价拿破仑对外战争。(2)过程与方法目标收集有关拿破仑的资料,撰写评价拿破仑的小论文,讲述拿破仑的故
新闻法治(人大2009年研)
考生文件夹下存在一个数据库文件“samp3.accdb”,里面已经设计好表对象“tStud”,同时还设计出窗体对象“fStud”和子窗体对象“Detail”。请在此基础上按照以下要求补充“fStud”窗体的设计:将窗体标题改为“学生查询”。
最新回复
(
0
)