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
The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians tha
The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians tha
admin
2012-09-10
46
问题
The Development of Rubber
Here is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid (52) milk came out, and that (53) this a sticky (粘的) mass of rubber might be made. This rubber is soft when warm, so that it is possible to give it any (54) . The Peruvians made the (55) that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to (56) their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh (57) , and our raincoats are still named after him.
But these first rubber overshoes and raincoats were all soft and sticky in summer, and (58) and inelastic (无弹性的) in the winter when it was col D. But the rubber we have today is soft and elastic (有弹性的), (59) very strong m even in the warmest summer and the coldest winter. This was made (60) by a man called Goodyear. After many (61) , he found that nitric acid (硝酸) made the rubber much better, but it is not hard and strong enough. Then a strange thing took(62) . A friend of his, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulfur (硫磺) and put in the sun. Goodyear put this idea (63) the test, and saw that it did have more or less the desired effect though somewhat less than more. The only effect it had was on the outside of the rubber. It is common knowledge now that the (64) to make rubber hard and strong is by heating it with sulfur. It took Goodyear four more years to find this metho D. When at last he did it, he had (65) at all. Everything of the smallest value had been used to get money, even his sons’ school-books.
选项
A、system
B、style
C、way
D、direction
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/XmQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
TryingtoFindaPartnerOneofthemoststrikingfindingsofarecentpollintheUKisthatofthepeopleinterviewed,one
AcandidatesforclinicaltrialsBduringthetrialCmedicalknowledgeDinhumansEbeforeparticipationFforsomepatients
AsheisgoingtoworkinHollandfortwoyears,hewillbepartedfromhistwochildren.
WalkingBarefootCanHelpPreventSomeInjuriesWalkingbarefoothelpstoimprovebalance,postureandpreventcommonfootin
RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseofdeathintheUnitedStates,afterheartdisease.I
Thequestion"Areyouamanoramouse?"reallymeanstoaskwhetheryoubelieveAccordingtoParagraph1,youcouldonlytell
Thewayonelooks,talksandmovesdependsThemainideaofthethirdparagraphis
Unlikegases,liquidsaredifficulttocompressbecausethereispracticallynofreespacebetweenmolecules.
随机试题
A、Aghost.B、Awitch.C、Avampire.D、Akiller.B
Animalsaredividedintomanygroups.Somegroupsofanimalsincludethe,insects,fish,amphibians,reptiles,birdsandmammals
发射(Emission)
慢性酒精中毒的临床表现不包括
常见的前上纵隔肿瘤是()
患儿,女,3岁。自幼发现心脏杂音,经常患肺炎,查体胸骨左缘第3~4肋间Ⅳ级粗糙收缩期杂音,心电图示左心室及右心室均肥大,X线片示肺血多。最常见的并发症是
尽管这两年某国每年有500万人口脱盲。但扫除文盲的形势不容乐观,该国的成人非文盲率在亚洲排名非常靠后。且脱盲速度也比周边国家慢。概括起来,这段话的意思是()。
Duringthepastyearsthe______ofautomobileaccidentsinNewYorkCityhasdecreased.
在网络管理中,一般采用______的管理模型。
某二叉树中有n个度为2的结点,则该二叉树中的叶子结点数为
最新回复
(
0
)