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
Scientists working on a problem do not know and sometimes can’t even guess what the final result will be. Late on Friday, 8 Nove
Scientists working on a problem do not know and sometimes can’t even guess what the final result will be. Late on Friday, 8 Nove
admin
2009-06-15
77
问题
Scientists working on a problem do not know and sometimes can’t even guess what the final result will be. Late on Friday, 8 November, 1895, Professor Rontgen, a German physicist, was doing an experiment in his laboratory when he noticed something extraordinary. He had covered an electric bulb with black cardboard, and when he switched on the current he saw little dancing lights on his table. (46); how then could any ray penetrate? On the table there were some pieces of paper which had been covered with metal salts. (47). Professor Rontgen took a piece of this paper and held it at a distance from the lamp. Between it and the lamp he placed a variety of objects, a books, a pack of cards, a piece of wood and a door key. The ray penetrated every one of them except the key. He called his wife into the laboratory and asked her to hold her hand between the lamp and a photographic plate. (48), but she held up her hand for a quarter of an hour, and when the plate was developed there was a picture of the bones of her hand and of the ring on one finger. The mysterious ray could pass through the flesh and not through the bone or the ring.
At a scientific meeting, Professor Rontegen called this new ray "the unknown", the X-ray.(49), and soon there were X-ray machines in all the big hospitals. The most obvious use for this discovery was to enable doctors to see exactly how a bone was fractured. Other uses came later. It was found that these rays could be used to destroy cancer cells, just as they destroyed the healthy cells of the doctors who first used the machines. (50), and the lungs could be X-rayed to show if there was any tuberculosis present.
A. It was on this paper that the lights were shining
B. She was very surprised by this request
C. Now the bulb was completely covered
D. It was a great invention
E. Methods were found later by which ulcers in the stomach could be located
F. Doctors quickly saw how this could be used
选项
答案
C
解析
意为:现在灯泡整个被包裹住了。
转载请注明原文地址:https://kaotiyun.com/show/cz1d777K
本试题收录于:
职称英语卫生类C级题库职称英语分类
0
职称英语卫生类C级
职称英语
相关试题推荐
Youarerequiredtowriteanessayabout120wordsonthegiventopic:SmokingIsHazardoustoPeople’sHealth
Whilestillinitsearlystages,welfarereformhasalreadybeenjudgedagreatsuccessinmanystates,atleastUNisgettingp
1.Fewsocialproblemshaveincreasedsosuddenlyorbeendramatizedsoeffectivelyastheplightofthehomelessinthe1980sa
Peopletravelinglongdistancesfrequentlyhavetodecidewhethertheywouldprefertogobyland,sea,orair.Hardlyanyoneca
Peopletravelinglongdistancesfrequentlyhavetodecidewhethertheywouldprefertogobyland,sea,orair.Hardlyanyoneca
1.TheUSeconomy,whichmakesuponequarterofworldeconomicoutput,isslowingsharply,andbringingdowngrowththroughthe
Formuchofthepastdecade,AmericanandBritishscientistshavebeenannoyedbythephenomenonknownastheFrenchParadox.Nu
Lookatthetenstatementsforthispart.Youwillhearapassageabout"AResearchonSleep".Youwilllistentoittwice.
AActionsTakentoHelpBTreatmentofVomitingCTheDifferencebetweenLifeandDeathDMedicalImportanceofFirstAidE
Thecompanyrecommendedthatanewpetrolstationbebuilthere.
随机试题
A.潜在并发症:休克B.有感染的危险与损伤有关C.缺乏保健知识D.排尿异常与损伤有关E.焦虑患者搬动重物后突然左侧下腹痛,放射至大腿内侧、会阴部,有镜下血尿。此患者排在首位的护理诊断是
构成人体的基本物质是
施工质量控制的过程包括()。
一张票面利率为8%、15年期债券的到期收益率为10%,久期为8.05年。如果市场收益率变动25个基点,债券的价格将会变动( )。
上市公司的盈利性会影响股价变动,衡量盈利性最常用的指标有( )。
在德育过程中,有的学生因为对行为规范不理解,认识不到位,常常出现喊口号式的道德表现,只会说,但不理解,导致“言行不一”的情况。对此,教师应从()着手展开德育工作。
新文化运动的基本口号是民主与科学,其中“民主”主要是指
系统实施是信息系统开发期的最后阶段,系统实施阶段的内容包括()。
TCP/IP的互联层采用IP协议,它相当于OSI参考模型中网络层的______。
Peopleconsume200extracaloriesadaywheneatingatarestaurantcomparedtodiningathome,anewstudyhasrevealed.Resear
最新回复
(
0
)