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
40
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、myth
B、legend
C、secret
D、mystery
答案
D
解析
对大多数用户仍然是个迷,应用mystery"神秘,神秘的事物"。
转载请注明原文地址:https://www.kaotiyun.com/show/jHp4777K
0
考研英语一
相关试题推荐
YouaresupposedtoinviteDr.Kingtomakeaspeechaboutthefuturedevelopmentofcomputerscienceattheannualconferenceo
Youhavereceivedaninvitationfromagoodfriendfordinner,butyouarenotableto-acceptit.Sowritealettertoapologize
Intheeyesofvisitorsfromtheoutsideworld______Itcouldbeinferredfromthelastparagraphthat______
Britain’sgardenershaverevealedoneoftheirgreatestpethates—otherpeople’scats.Okay,they’resadisticmurderers—butisi
ItcanbeinferredthatAmericansbeingapproachedtocloselybyMiddleEasternerswouldmostprobably______Incountriesother
ThetimehascomeforhumanitytojourneytoMars.We’reready.(46)ThoughMarsisdistant,wearefarbetterpreparedtodayto
Economistsbelievethatjobearningsinfluencechoiceofoccupation.Theyacknowledgethatpeopleplacevaryingemphasis【C1】____
Eachscientificspecialtyhasitsownsetofjournals.PhysicistshavePhysicalReviewLetters,cellbiologistshaveCell,neuro
随机试题
A.可见Auer小体B.红细胞大小不等,中心淡染区扩大C.细胞中含粗大嗜清颗粒比例≥30%D.骨髓增生低下,造血细胞减少E.红细胞中有染色质小体再生障碍性贫血的骨髓穿刺细胞学检查可见
新生儿,女,出生第5天,因全身冰冷,拒奶24小时入院。查体:T35℃,反应差,皮肤是暗红色,心音低钝,双小腿皮肤如硬橡皮样。脐带已脱落。最可能的诊断是
在国际上,民用建筑项目工程总承包的招标多数采用()的方式。
顾炎武说:“士而不先言耻,则为无本之人;非好古而多闻,则为空虚之学。以无本之人而讲空虚之学,吾见其日是从事于圣人而去之弥远也。”顾炎武上述言论的主旨是()。
[*]
Goinghungryisamajorcontributortoillhealth,particularlyamongchildren,andanewreportrevealshowlong-lastingtheda
下面代码的输出结果是()。deff(n):ifn==1:return1else:returnn*f(n—1)print(f(4))
Sinceancienttimesithasbeenknownthatyourwordisacausesetinmotion.Infact,theuniverseitselfisclaimedtohavee
PleaseContactustoArrangeaSafetyInspection.Address:246N.HighSt.,Columbus,Ohio43215.ColumbiaGasmustperformasa
Eachyearsome4trillione-mailsaresentworldwidefromabout600millionelectronicmailboxes.In1995,employeessentthree
最新回复
(
0
)