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
考研
The (1)_____ of the fluorescent tube (2)_____ a major revolution in the development of better and cheaper lighting. First shown
The (1)_____ of the fluorescent tube (2)_____ a major revolution in the development of better and cheaper lighting. First shown
admin
2011-10-20
47
问题
The (1)_____ of the fluorescent tube (2)_____ a major revolution in the development of better and cheaper lighting. First shown at the New York and San Francisco World (3)_____ in 1939, this more efficient, more diffuse, longer-lived lamp has been (4)_____ improved, so that slowly it (5)_____ the supremacy of the incandescent household globe. The fluorescent tube (6)_____ Australian homes, shops and factories today is seven or eight times (7)_____ the tubes that brought shadow-free lighting to many of Britain’s wartime factories. Its (8)_____ too, is much greater—from 2,000 hours in 1940 to mc/re than 7, 500 hours today.
But (9)_____ its (10)_____ use for more than 30 years, the fluorescent tube remains a
(11)_____ to many of its users. It is built (12)_____ a completely different (13)_____ from the incandescent light. In the incandescent bulb, a tungsten wire (14)_____ than a human hair, is brought to white-hot temperature by passing an electric (15)_____ through it. In the fluorescent tube a stream of electrons bombards a gas containing mercury, (16)_____ invisible ultraviolet radiation. The ultraviolet rays hit the fluorescent coating that (17)_____ the tube, (18)_____ it to grow. A 40 watt fluorescent tube gives twice as much light as a 100.watt tungsten globe, (19)_____ about five times as long, and runs cool enough to (20)_____ higher levels of light.
选项
A、lines
B、darkens
C、protects
D、brightens
答案
A
解析
该句意为,紫外线照射排列在管壁的荧光涂料,使它发光。line"排列",符合题意。
转载请注明原文地址:https://kaotiyun.com/show/xHp4777K
0
考研英语一
相关试题推荐
Intheeyesofvisitorsfromtheoutsideworld______Itcouldbeinferredfromthelastparagraphthat______
ThetimehascomeforhumanitytojourneytoMars.We’reready.(46)ThoughMarsisdistant,wearefarbetterpreparedtodayto
ThetimehascomeforhumanitytojourneytoMars.We’reready.(46)ThoughMarsisdistant,wearefarbetterpreparedtodayto
ThetimehascomeforhumanitytojourneytoMars.We’reready.(46)ThoughMarsisdistant,wearefarbetterpreparedtodayto
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Ababywho______whenyounghasthebetterchanceofgrowingupsuccessfully.
YourfriendMaryBrownwillgotoWashingtonD.C.nextmonth.WritealettertoTonywhoisthereandintroduceMarytohim.You
随机试题
心电图上R-R间期绝对规则,频率200次/分,QRS波群时限为0.08秒,最可能的诊断是
周围血管征的发生机理是()
关于记忆及记忆障碍,哪种说法是错误的
【案情】顾某(中国籍)常年居住M国,以丰厚报酬诱使徐某(另案处理)两次回国携带毒品甲基苯丙胺进行贩卖。2014年3月15日15时,徐某在B市某郊区交易时被公安人员当场抓获。侦查中徐某供出了顾某。我方公安机关组成工作组按照与该国司法协助协定赴该国侦
旅游者要求转递的物品中若有(),导游人员应婉言拒绝,请其自行处理。
构建具有我国本土特色的社会工作价值体系时,应考虑我国的社会背景和社会意识形态,避免过分注重眼前利益的( )。
阅读下面的文字,完成下列问题“淡”是人生最深的滋味蒋醺(台湾)
若∫df(x)=∫dg(x),则下列结论中,错误的是().
Whatistheannouncementmainlyabout?
Attheageof12,thehumanbodyisatitsmostvigorous.Ithasyettoreachitsfullsizeand【T1】______,anditsownergetshi
最新回复
(
0
)