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 that whe
The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge(51)the Peruvians that whe
admin
2009-06-15
52
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 cold. But the rubber we have today is soft and elastic (有弹性的),(59)very strong—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 sulphur (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 sulphur. It took Goodyear four more years to find this method. 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、experiments
B、checks
C、discoveries
D、works
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/lahd777K
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
ChangesofWomen’sRoleTheroleofwomeninBritainhaschangedalotinthiscentury,(51)inthelasttwentyyears.Them
ChangesofWomen’sRoleTheroleofwomeninBritainhaschangedalotinthiscentury,(51)inthelasttwentyyears.Them
OrganDonationandTransplantation1.Organdonation(捐献)andtransplantation(移植)referstotheprocessbywhichorgansor
Whatdoactivistsworryabout?Accordingtothepassage,people’sattitudetowardthecureofAIDSis______.
A.thequakeitselfB.accuratepredictionC.damageofpropertyandlossoflivesD.apossibleearthquakeE.theunusualbehav
Thegovernmentproposedchangestothevotingsystem.
FirstaidmaybringaboutallthefollowingresultsEXCEPTBeforeweadministerfirstaidtoavictim,itisveryimportantfor
Thequestion"Areyouamanoramouse?"reallymeanstoaskwhetheryoubelieveAccordingtoParagraph1,youcouldonlytell
AssoonasLindawentintothedepartmentthatsoldraincoats,shesensedtherewassomethingunusualintheatmosphere.Fir
随机试题
痰饮的病因病机如何,如何理解治饮病“当以温药和之”的治疗原则?
当其取于心而注于手也,汩汩然来矣。汩汩:
鉴别渗出液和漏出液最有用的方法是
心肾不交证的本质是()。
影响利率的因素有多种,通常情况下,利率的最高界限是()。
关于日本个人所得税应税所得的规定,下列说法中错误的是( )。
某中外合资家电生产企业,共有在册职工120人,资产3500万元。2008年销售产品取得不含税收入2500万元,会计利润600万元,已预缴所得税150万元。经会计师事务所审核,发现以下问题:(1)期间费用中广告费450万元、业务招待费15万元、研究开发费
贷款价格的构成包括()。
下列关于公务员职务升降的做法,错误的是()。
Despitethescandalsoverleakede-mails,thescientificevidenceforglobalwarmingremainsstrong.Thequestion,then,istow
最新回复
(
0
)