《看LED电视》阅读附答案-.doc

CCFL（冷阴极荧光灯）是通过在两个电极之间加上高频高压激发管内汞蒸气（惰性气体和汞）产生紫外线使管内壁的荧光粉发光CCLF背光和LED背光区别是什么？难道CCLF比起LED一点优点也没有么？LED的优点和缺点是什么？浏览次数：976次悬赏分：0 |解决时间：2009-8-14 19:59 |提问者：cocolohan如题最佳答案ccfl 需要高压驱动所以ccfl需要一个高压逆变器吧12v直流电变成800V左右交流电led不需要led发光效率比cclf高所以这就是说led省电的原因（同样功率led发的光更多些）led 是由r g b配光得来的比ccfl光谱范围广颜色更加多一点led 如果坏几个没事影响不大ccfl坏一个也许就半面不亮了或者保护整个背光都不亮CCLF背光和LED背光区别是什么？有缺点？2010-06-26 liujia【大中小】【打印】LED还是液晶，只是把传统的背光源换成LED背光源，LED背光源有以下特点：1、省电。

2、发光均匀。

3、寿命长。

4、色彩好。

5.成本低。

而且LED背光灯国内很多厂家都会生产。

目前市场上的所谓的LED还是液晶，还有响应速度慢，还有液晶的弊端，真正比较好的将来替代液晶的叫OLED，是一种自发光的显示器，对比度非常高，在太阳地下都能看清图像，而且非常省电。

另外，严格的LED显示器为OLED,就是每个像素由RGB颜色LED组成，市场很少见CCLF荧光灯具备什么性能浏览次数：432次悬赏分：0 | 解决时间：2011-1-8 15:04 | 提问者：yuansanpei最佳答案高效率，长寿命，50000小时宽光谱，颜色表现好低发热低质量比较特殊的是负阻特性，电压高时，电流小高点亮电压，另外就是要交流驱动，怕直流驱动，直流会把水银“镀”到一边，损坏灯管。

什么样的电子荧光板好浏览次数：387次悬赏分：0 |解决时间：2011-2-17 16:06 |提问者：梦里花2009最佳答案艺奇荧光板产品的组成产品组成:显示面板，电子光源，电子控制主板，电子点触开关，框架，电源适配器。

《看完电视》阅读附答案中考语文阅读理解《看完电视》看完电视以后，老王一整夜都没睡好。

第二天一大早就往武汉打电话，直到9点，那端才响起儿子的声音：“爸，什么事？”他连忙问：“昨晚的天气预报看了没有？寒流快到武汉了，厚衣服准备好了吗？要不然，叫你妈给寄……”儿子漫不经心：“不要紧的，还很暖和呢，到真冷了再说。

”老王絮絮叨叨，儿子不耐烦了：“知道了，知道了。

”搁了电话。

他刚准备再拨过去，铃声突响，是他住在哈尔滨的老母亲，声音发颤：“天气预报说，北京今天要变天，你加衣服了没有？”疾风阵阵，穿过窗户缝隙乘虚而入，他还不及答话，已经结结实实打了个大喷嚏。

老母亲急了：“已经感冒了不是？怎么这么不听话？从小就不爱加衣服……”絮絮叨叨，从他7岁时的“劣迹”一直说起，他赶紧截住：“妈，你那边天气怎么样？”老人答：“雪还在下呢。

”他不由自主地愣住了。

在寒潮初袭的清晨，他，深深牵挂的，是北风尚未抵达的武汉，却忘了匀一些，给北风起处的故乡和已经年过7旬的母亲。

人间最温暖的亲情，为什么竟是这样的？老王自己都有点发懵。

1.指出上文所叙事情发生的时间、地点，文中主要人物。

时间：_______；地点：________；主要人物：_______.2.用文中词语填空。

（1）老王对儿子的关爱、老母亲对老玉的关爱，同样表现为他们说话时的______.（2）对于父亲的町嘱，儿子的态度是：____；对于老母亲的叮嘱，老王的表现是：____.3.老王为什么“不由自主地愣住了”？答：__________________________________________________________________________________4.“人间最温暖的亲情，为什么竟是这样的”含义是什么？表现了老王怎样的心理？答：__________________________________________________________________________________5.老王对儿子和对母亲的不同态度，主要是用什么写法来表现的？答：______________________________________________________________________________6.读了上文，你受到什么教育？答：______________________________________________________________________________参考答案：1、时间：某天上午9点左右。

外刊精读让马拉松变得更环保导读：似乎在世界各地，每个主要的大城小镇都会举办年度马拉松比赛。

成千上万的参赛运动员要经受艰难的体能考验，跑完42.1 公里的赛程。

和其它大型比赛一样，马拉松比赛也会产生大量的碳足迹。

数千人乘坐飞机前来参赛或观赛，观众和运动员留在赛道的食物垃圾、包装袋、礼品袋等等。

本期《外刊精读》讨论相关部门针对马拉松比赛所采取的各项环保措施。

一、语篇泛读Even if you’re a couch potato like me, you’ll know the benefits of running - pounding the pavements, working up a sweat, burning off some calories and generally keeping fit. But if you’re a real fitness junkie, the ultimate running challenge is to take part in a marathon.It seems every major city and town aro und the world hosts an annual marathon, with thousands of athletes running a gruelling 42.1 kilometers. Whilst many runners’ motivation is to beat their personal best and cross the finishing line without collapsing, they’re also doing it for a good cause– to generate funds for charity. But like other major events, the marathon also generates a massive carbon footprint. Thousands travel - some by plane - to the location, and waste from food packaging and goody bags gets left behind by spectators and runners. For example, during the London Marathon in 2018, 47,000plastic bottles were collected, although some were recycled.This is becoming a big issue for cities –how to host a worthwhile event, encouraging people to exercise and help charities, whilst protecting the environment? Several cities have developed formal plans to reduce their environmental impact and promote sustainable ideas. One event in Wales, for example, introduced recycling for old running kit and ethically sourced the race t-shirts.It’s something that this year’s London Marathon tried to tackle by reducing the number of drink stations on the running route, giving out water in paper cups and offering some drinks in edible seaweed capsules. They also trialed new bottle belts made from recycled plastic so 700 runners could carry water bottles with them during their run. London Marathon event director Hugh Brasner told the三、测试与练习阅读课文并回答问题。

2023-2024学年部编版六年级语文下册第一单元主题阅读（含答案）（分清内容的主次，体会作者是如何详写主要部分的。

）类文阅读故乡的元宵（节选）汪曾祺上街去看走马灯。

走马灯不过是来回转动的车、马、人（兵）的影子，但也能看它转几圈。

后来我自己也动手做了一个，点了蜡烛，看着里面的纸轮一样转了起来，外面的纸屏上一样映出了影子，很欣喜。

乾陞（s hēnɡ）和的走马灯并不“走”，只是一个长方的纸箱子，正面白纸上有一些彩色的小人，小人连着一根头发丝，烛火烘热了发丝，小人的手脚会上下动。

它虽然不“走”，我们还是叫它走马灯。

要不，叫它什么灯呢？这外面的小人是唐僧、孙悟空、猪八戒、沙和尚，整个画面表现的是《西游记》唐僧取经。

孩子有自己的灯。

兔子灯、绣球灯、马灯……兔子灯大都是自己动手做的。

下面安四个轱辘（ɡū lu），可以拉着走。

兔子灯其实不大像兔子，脸是圆的，眼睛是弯弯的，像人的眼睛，还有两道弯弯的眉毛！绣球灯、马灯都是买的。

绣球灯是一个多面的纸扎的球，有一个篾（m iè）制的架子，架子上有一根竹竿，架子下有两个轱辘，手执竹竿，向前推移，球即不停滚动。

马灯是两段，一个马头，一个马屁股，用带子系在身上。

西瓜灯、蛤蟆灯、鱼灯，这些手提的灯，是小孩玩的。

有一个习俗可能是外地所没有的：看围屏。

硬木长方框，约三尺高，尺半宽，镶绢，上画工笔演义小说人物故事，灯节前装好，一堂围屏约三十幅，屏后点蜡烛。

这实际上是照得透亮的连环画。

看围屏有两处，一处画的是《封神榜》，另一处画的是《三国》。

围屏看了多少年，但还是年年看，好像不看围屏就不算过灯节似的。

（有删改）1.选文介绍了哪三个方面的内容？用简洁的文字概括出来。

_______________---_______________——_________________2.读短文，体会文章细致的描写，完成练习。

（1）作者是怎样详细描写“上街去看走马灯”这一内容的？（）A.具体描写各种走马灯的样子。

(每日一练)(文末附答案)2022届八年级物理第十八章电功率经典大题例题单选题1、在如图甲所示的电路中，电源两端的电压保持不变，开关S闭合后，将滑动变阻器的滑片P由a端滑至b端的过程中，通过小灯泡的电流I随其两端电压U变化的I-U图像如图乙所示。

已知小灯泡的额定电压为12V，下列说法中正确的是（）A．在电压表示数变小的过程中，电路消耗的总功率不断变大B．滑动变阻器的最大阻值为9ΩC．滑片P由a端滑至b端的过程中，小灯泡的电功率变化了9WD．滑片P由a端滑至b端的过程中，电路的总电功率变化了21W2、关于电学知识，下列法正确的（）A．B．C．D．3、标有“220V24W”的甲灯和标有“220V40W”的乙灯铭牌如图所示，下列说法中正确的是（）A．两灯均正常发光时，甲灯的电阻小于乙灯的电阻B．串联后接在220V的电路中，因为通过它们的电流相等，所以一样亮C．串联后接在220V的电路中，因为甲灯实际功率较大，所以甲灯较亮D．串联后接在220V的电路中，因为乙灯额定功率较大，所以乙灯较亮4、如图所示分别是小英家上月初和上月末电能表的示数。

结合表盘上的信息可知，下列选项中正确的是（）A．小英家家庭电路中的干路电流不得超过10AB．小英家上个月消耗的电能为C．电能表上指示灯闪烁320次，表示家庭电路消耗电能0.2JD．电能表上指示灯闪烁的次数越多，说明电路中消耗的电能越多5、在学习、生活中所涉及到的物理量，你认为最接近实际情况的是A．电冰箱一天消耗的电能约为50kW·hB．教室电风扇额定电功率约为1000WC．对人体的安全电压不高于36VD．液晶电视正常工作电流约为10A6、甲、乙、丙三盏灯分别标有“220V60W”“110V60W” “36V60W”的字样，三盏灯都正常发光，比较它们的亮度（）A．甲灯最亮B．乙灯最亮C．丙灯最亮D．一样亮7、某同学连接了如图所示的电路，已知每节干电池的电压为1.5V，小灯泡L的额定电压为2.5V。

草莓草莓,又叫红莓,地莓等,它的外型呈心形,鲜美红嫩,果肉多汁,酸甜可口,香味浓郁,不仅有色彩还有一般水果所没有的宜人芳香,是水果中难得的色,香,味俱全者,因此常被人们誉为“果中皇后”。

草莓中所含的葫萝卜素是合成纤维a的重要质,它具有明目养肝的作用。

它还含有果胶和丰富的膳食纤维,可以帮助消化。

草莓对肠胃道和贫血均有一定的滋补调理作用。

草莓除了可以预防坏血病外,对防治动脉硬化,冠心病也有较好的功效。

草莓是鞣酸含量丰富的植物,在体内可吸附和阻止致癌化学物质的吸收,具预防癌作用。

据研究,女性常吃草莓,对皮肤,头发均有保健作用。

草莓在德国被誉为“神奇之果”。

草莓还可以减肥,因为它含有一种叫天冬氨酸的物质,可以自然而平缓地除去体内的“矿渣”。

中国医学认为,草莓性凉味酸,具有润肺生津、清热凉血,健脾解酒等功效。

据测定,每100克草莓果肉中含糖8至9克,蛋白质0.4至0.6克,维生素c50至100毫克,比苹果、葡萄高7到10倍。

而它的苹果酸、柠檬酸、维生素b1、维生素b12,以及胡萝卜素、钙、磷、铁的含量也比苹果、梨、葡萄高3到4倍。

台湾人把草莓称为“活的维生素丸”,德国人把草莓誉为“神奇之果”,可见是不无道理的。

选购草莓,以色泽鲜亮、有光泽、颗粒大、清香浓郁者为佳。

蜜蜂我是一只小蜜蜂。

我们蜜蜂是过群体生活的。

在一个蜂群中有三种蜂：一只蜂王，少数雄蜂和几千到几万只工蜂。

我就是这千万工蜂之一。

我的母亲就是蜂王，它的身体最大，几乎丧失了飞行能力。

这没有关系，它有千千万万个儿女，我们可以供养它，也算尽了孝道吧!在我的家族中，只有蜂王可以产卵，它一昼夜能为我们生下1.5万到2万个兄弟。

蜂王的寿命大约是三年到五年，在我们家族中它可以说是寿星了。

在蜂群中还有一种蜂叫雄蜂，它和我们大不相同，它“人高马大”身体粗壮，翅也长。

它的责任就是和蜂王交尾。

交尾之后，它也就一命呜呼了。

要说家族中数量最多，职责最大的还是我们工蜂。

我们是蜂群的主要成员，工作也最繁重：采集花粉、花蜜，酿制我们的“口粮”、哺育我们的弟弟们、饲喂我们的母亲、修造我们的房子、保护家园、调节室内温度和湿度……别看这样，我们的身体是非常弱小的，我们的寿命也只有六个月，就像天空的流星一样——一闪即逝，仅有一点儿时间去闪耀自己的光辉。

部编六年级语文上册：8 灯光阅读理解专项训练(含答案)一、语文课内外阅读理解1．课内阅读。

我正要níng shì他们时，zhòu rán 一惊，睁开眼，云jǐn也已皱蹙_______（zú cù），凌乱，仿佛有谁zhì一块大石下河水中，水波dǒu rán起立，将整篇的影_______（yǐng yěng）子撕成片片了。

我无意识地赶忙捏住几_______（jījǐ）乎坠地的《初学记》，眼前还剩着几点虹霓_______（mí ní）色的碎影。

我真爱这一篇好的故事，趁碎影还在，我要追回他，完成他，留下他。

我抛_______（pāo pōu）了书，欠身伸手去取笔，——何_______（尝常）有一丝碎影，只见昏暗的灯光，我不在小船里了。

但我总记得见过这一篇好的故事，在昏沉的夜。

（1）根据拼音把词语写在横线上。

（2）从括号里选择正确的读音或字。

（3）“昏沉的夜”指的是什么？（4）写写你对画线句子的理解。

【答案】（1）凝视；骤然；锦；掷；陡然（2）cù；yǐng；jī；ní；pāo；尝（3）昏沉的夜是指作者在当前一片黑暗社会的描述。

（4）理解：作者珍爱自己的人生，努力地在一片黑暗社会中改变自己的人生。

【解析】【分析】（1）本题主要考查对词语（汉字）的拼写能力。

解答本题，首先读一读拼音，知道要写什么词语，然后写出正确的词语，写完后读一读，看看是否正确。

注意掌握生字的结构和易错点。

（2）本题为考查字形、字音题。

字形、字音题的考查只要求识记字形、字音而不要求拼写,即侧重于考查识记、辨别、确定汉字、字音的能力,准确地判断其正确与否。

（3）这道题考查的是词语在具体语境中的意思，解答时要联系文章上下文及主旨来思考。

（4）理解文章语句的含义，一要结合具体的语境，二要结合文中人物的情感。

根据词句原本意义，结合具体语境，理解、分析、推断词句的不同含义，去深入理解词句的真正含义。

英语六级仔细阅读练习附答案导读：我根据大家的需要整理了一份关于《英语六级仔细阅读练习附答案》的内容，具体内容：在英语学习过程中，阅读理解能力是学习者发展语言能力的基础和手段。

国内的各类英语考试中几乎都有阅读理解题型，大学英语六级考试也不例外。

大学英语六级阅读理解试题是试卷中分值最重的题型，为了提...在英语学习过程中，阅读理解能力是学习者发展语言能力的基础和手段。

国内的各类英语考试中几乎都有阅读理解题型，大学英语六级考试也不例外。

大学英语六级阅读理解试题是试卷中分值最重的题型，为了提高大家的阅读水平，下面是我为大家带来，希望对大家的学习有所帮助!英语六级仔细阅读练习一Questions 56 to 60 are based on the following passage.Terry Wolfisch Cole may seem like an ordinary 40-year-old mom, but her neighbors knowthe truth: Shes one of the "Pod People." At the supermarket she wanders the aisles in a self-contained bubble, thanks to her iPod digital music player. Through those little white ear buds,Wolfisch Cole listens to a playlist mixed by her favorite disc presenter-herself.At home, when the kids are tucked away, Wolfisch Cole often escapes to another solomedia pod- but in this one, shes transmitting instead of just receiving. On her computer weblog, or "blog", she types anonline journal chronicling daily news of her life, then shares it allwith the Web.Wolfisch Cole-who also gets her daily news customized off the Internet and whose digitalvideo recorder (DVR)scans through the television wasteland to find and record shows that suither tastes-is part of a new breed of people who are filtering, shaping and even creating mediafor themselves. They are increasingly turning their backs on the established system of massmedia that has provided news and entertainment for the past half-century. Theyve joined theexploding "iMedia" revolution, putting the power of media in the hands of ordinary people.The tools of the movement consist of a bubbling stew of new technologies that includeiPods, blogs, podcasts, DVRs, customized online newspapers, and satellite radio.Devotees of iMedia run the gamut (范围)from the 89-year-old New York grandmother,known as Bubby, who has taken up blogging to share her worldly advice, to 11-year-old DylanVerdi of Texas, who has started broadcasting her own homemade TV show or "vlog, for videoweb log. In between are countless iMedia enthusiasts like Rogier van Bakel, 44, of Maine, whoblogs at night, reads a Web- customized news page in the morning, travels with his fully loadediPod and comes home to watch whatever the DVR has chosen for him.If the old media model was broadcasting, this new phenomenon might" be called ego-casting, says Christine Rosen, a fellow with the Ethics and Public Policy Center. The term fits,she says, because the trend is all about me-me-media -" the idea is to get exactly what youwant, when and where you want it."Rosen and others trace the beginnings of the iMedia revolution to the invention of theTV remote, which marked the first subtle shift of media control away from broadcasters andinto the hands of the average couch potato. It enabled viewers to vote with their thumbs-making it easier to abandon dull programs and avoid commercials. With the proliferation (激增)of cable TV channels in the late 1980s followed by the mid-1990s arrival of the Internet,controlling media input wasnt just a luxury. "Control has become a necessity," says Bill Rose, "Without it, theres no way to sort through all the options that are becoming available."56. Who is Terry Wolfisch Cole probably according to the passage?A.A middle-aged housewife.B.A saleswoman in the supermarket.C.A disc presenter.D.An online news writer.57. Which of the following is the characteristic of the new breed of people according to thepassage ?A.They provide news and entertainment for the public.B.They have started the iMedia revolution.C.They have helped ordinary people control media.D.They choose what to listen to or watch by themselves.58. What can be learned about the devotees of iMedia from the passage?A.They are either very old or very young.B.They consist of people of all ages.C.They are located in New York, Texas and Maine.D.They share the same interests.59. According to the passage, Christine Rosen calls the iMedia revolution ego-castingbecause _________A.people show themselves in the mediaB.people get their needs for media metC.people can watch whatever they likeD.it is the invention of an individual60. Why was the invention of the TV remote important according to the passage?A.Because it enabled ordinary people to control media to some extent.B.Because it made more cable TV channels available to people.C.Because it led to the invention of Internet in the 1990s.D.Because it made life easier for couch potatoes.英语六级仔细阅读练习二Questions 61 to 65 are based on the following passage.Many bankers may be worried about whether some fancy product dreamed up might yetlead to a visit from the police. Daniel Dantas, a financier, who has profited by operating at themiddle place where business and government meet in Brazil, has been opening the door to findthe police outside for much of thepast decade. On December 2nd he was convicted of a less sophisticated crime: trying tobribe police officers. Mr. Dantas, who has acquired great notoriety in Brazil, was fined $ 5million and sentenced to ten years in prison. He has appealed against his conviction.The charge stems from a police investigation intomoney-laundering (洗钱)known asOperation Satiagraha. It grew out of a previous investigation into Mr. Dantas use of Kroll, asecurity consultancy, to watch over his business partners. During this investigation the policeseized a computer from Opportunity, Mr. Dantass investment bank, which contained datafrom the mid-1990s to 2004 and apparently showed suspicious movements of money.The judge found that Mr. Dantas tried to pay bribes, via two go-betweens, to keep his nameout of the Satiagraha investigation.A man fitted with a bugging device was offered $1 millionin cash, with another $ 4 million to follow, the police say. They claim that Mr. Dantass trickinvolved money travelling to the Cayman Islands, then via the British Virgin Islands to anaccount in Ireland, on to Delaware, and then re-entering Brazil as foreign investment.For Mr. Dantas his crime is a steep fall from grace. A man who sleeps little and socializesless, he is a vegetarian and self-made billionaire, a gifted financier who has serially fallen outwith his business partners. He once controlled a large telecoms firm, acting for investors whoincluded Citigroup. He says he is the victim of a conspiracy mounted by the government.It is Mr. Dantas supposed influence in government circles that has added to his notoriety.During the1990s, when many state-owned businesses were privatized, Mr. Dantas positionedhimself as the man with the needed expertise and contacts. He enjoyed easy access to thegovernment of President Femando Henrique Cardoso, including meetings with the presidenthimself. That influence carried through into the government of President Luiz Inacio Lula daSilva. Mr. Dantas is alleged to have been one of the funders of a cash-for-votes scheme inBrazilsCongress mounted by leaders of Lulas Workers Party in 2003-2004. Many of thosewho have had dealings with Mr. Dantas insist that these have been legitimate and conducted ingood faith.They include Luiz Eduardo Greenhalgh, a lawyer and PT politician, whom he hiredas a consultant.61. What kind of crime was Daniel Dantas convicted of according to the passage?A.A crime quite experienced and tactful.B.A crime by operating at the middle place.C.A crime attempting to temper police to work for him.D.A crime in money-laundering.62. How did the police convict the charge against Mr. Dantas according to the passage?A.They seized a computer by chance and got some evidence.B.They directly conducted a probe into him.C.They found he tempered police officers to delete his name.D.They questioned him and made sure the process ofmoney-laundering.63. Mr. Dantas relationship with his business partners is that __A.he usually gets along well with themB.he does not have a good relationship with themC.he totally trusts all of his business partnersD.he believes that they make him a victim64. What can we learn about Mr. Dantas according to the passage?A.He is a gifted financier and less socialized person.B.He always enjoys notorious fame in economic and political field.C.He is a vegetarian who likes making food by himself.D.His tragedy was mounted by the government conspiracy.65. What kind of relationship is reflected between Mr. Dantas and government in thepassage?A.His influence on government may reduce his notoriety and crime.B.In business privatization, he participated with demanding expertise.C.He never meets the President himself.D.People knowing him deem that he was sheer evil.答案解析：56.据第一段的内容可知此段最后一句中提到的disc presenter只是一个比喻，而并不是她的真实身份，故排除 C);第二段最后一句确实提到她会把自己日常生活中发生的事情放到网上与大家分享，但是真正的新闻作家不可能只写自己的日常生活，由此可以排除D)。

不懂量子点？没关系, 看过这篇文章就够了！什么是“量子点”?目前, 由于全人类正面临着自然资源短缺旳问题, 无法避免旳能源危机也在呼唤新材料旳诞生。

而真正具有科学意义旳新材料需要满足三个条件: 在原子和分子水平上重构物质、实现全新旳或者更好旳性能、变化人类生活方式。

量子点充足满足这三个条件, 同步更是人类有史以来发现旳最优秀发光材料。

简朴来说, 量子点是肉眼看不到旳、极其微小旳无机纳米晶体。

每当受到光或电旳刺激, 量子点便会发出有色光线, 我们所看到旳光线旳颜色由量子点旳构成材料和大小形状决定, 一般来说, 通过变化量子点晶体旳尺寸可以变化发光颜色。

举个例子, 一般量子点颗粒越小, 会吸取长波, 颗粒越大,会吸取短波。

例如2纳米大小旳量子点, 可吸取长波旳红色, 显示出蓝色。

8纳米大小旳量子点, 可吸取短波旳蓝色, 呈现出红色。

TCL从推出量子点电视以来, 正式开始了量子点在国内旳市场化试探。

特别今年推出了QUHD量子点电视之后, 更是在音画质等方面获得了重大突破, 率先推动量子点民用化、商用化和市场化落地。

“量子点”有什么用?我们都懂得, LCD面板旳成像原理可以概括为两张玻璃基板之间加入液晶分子, 通入电压后分子排列发生曲折变化, 屏幕通过电子群旳冲撞, 制造画面并通过外部光线旳透视反射来形成画面。

液晶自身并不发光, 需要配备高质量旳CCFL 冷阴极背光灯形成明亮旳图像。

随后, 背光源由CCFL改为LED背光源, 便成为了我们常说旳LED电视。

运用量子点材料旳电视是以蓝色LED为背光源, 将采用量子点旳光学材料放入背光灯与LCD面板之间, 从而可以通过拥有锋利峰值旳红、绿、蓝光获得鲜艳旳色彩。

如果您没明白旳话, 让我再换一种说法, 量子点会在LCD电视旳LED背光上形成一层薄膜, 用蓝色LED照射就能发出全光谱旳光, 从而对光线进行精细调节, 进而大幅提高色域体现, 让色彩更加鲜明。

打个或许不恰当旳比方, 老式旳LCD电视就像姑娘出门只化了裸妆, 虽然也足够美丽但脸部总显得没那么立体, 而量子点电视则像给姑娘涂上了全套彩妆, 真是赏心悦目明艳动人啊。

雅思（阅读）历年真题试卷汇编15(题后含答案及解析) 题型有：1.REVIEW OF RESEARCH ON THE EFFECTS OF FOOD PROMOTION TO CHILDRENThis review was commissioned by the Food Standards Agency to examine the current research evidence on: the extent and nature of food promotion to children the effect, if any, that this promotion has on their food knowledge, preferences and behaviour.A Children’s food promotion is dominated by television advertising, and the great majority of this promotes the so-called ‘Big Four’of pre-sugared breakfast cereals, soft-drinks, confectionary and savoury snacks. In the last ten years advertising for fast food outlets has rapidly increased. There is some evidence that the dominance of television has recently begun to wane. The importance of strong, global branding reinforces a need for multi-faceted communications combining television with merchandising, tie-ins’and point of sale activity. The advertised diet contrasts sharply with that recommended by public health advisors, and themes of fun and fantasy or taste, rather than health and nutrition, are used to promote it to children. Meanwhile, the recommended diet gets little promotional support.B There is plenty of evidence that children notice and enjoy food promotion. However, establishing whether this actually influences them is a complex problem. The review tackled it by looking at studies that had examined possible effects on what children know about food, their food preferences, their actual food behaviour(both buying and eating), and their health outcomes(eg. obesity or cholesterol levels). The majority of studies examined food advertising, but a few examined other forms of food promotion. In terms of nutritional knowledge, food advertising seems to have little influence on children’s general perceptions of what constitutes a healthy diet, but, in certain contexts, it does have an effect on more specific types of nutritional knowledge. For example, seeing soft drink and cereal adverts reduced primary aged children’s ability to determine correctly whether or not certain products contained real fruit.C The review also found evidence that food promotion influences children’s food preferences and their purchase behaviour. A study of primary school children, for instance, found that exposure to advertising influenced which foods they claimed to like; and another showed that labelling and signage on a vending machine had an effect on what was bought by secondary school pupils. A number of studies have also shown that food advertising can influence what children eat. One, for example, showed that advertising influenced a primary class’s choice of daily snack at playtime.D The next step, of trying to establish whether or not a link exists between food promotion and diet or obesity, is extremely difficult as it requires research to be done in real world settings. A number of studies have attempted this by using amount of television viewing as a proxy for exposure to television advertising. They have established a clear link between television viewing and diet, obesity, and cholesterol levels. It is impossible to say, however, whether this effect is caused by theadvertising, the sedentary nature of television viewing or snacking that might take place whilst viewing. One study resolved this problem by taking a detailed diary of children’s viewing habits. This showed that the more food adverts they saw, the more snacks and calories they consumed.E Thus the literature does suggest food promotion is influencing children’s diet in a number of ways. This does not amount to proof; as noted above with this kind of research, incontrovertible proof simply isn’t attainable. Nor do all studies point to this conclusion; several have not found an effect. In addition, very few studies have attempted to measure how strong these effects are relative to other factors influencing children’s food choices. Nonetheless, many studies have found clear effects and they have used sophisticated methodologies that make it possible to determine that i)these effects are not just due to chance; ii)they are independent of other factors that may influence diet, such as parents’ eating habits or attitudes; and iii)they occur at a brand and category level.F Furthermore, two factors suggest that these findings actually downplay the effect that food promotion has on children. First, the literature focuses principally on television advertising; the cumulative effect of this combined with other forms of promotion and marketing is likely to be significantly greater. Second, the studies have looked at direct effects on individual children, and understate indirect influences. For example, promotion for fast food outlets may not only influence the child, but also encourage parents to take them for meals and reinforce the idea that this is a normal and desirable behaviour.G This does not amount to proof of an effect, but in our view does provide sufficient evidence to conclude that an effect exists. The debate should now shift to what action is needed, and specifically to how the power of commercial marketing can be used to bring about improvements in young people’s eating.You should spend about 20 minutes on Questions 1-13, which are based on Reading Passage 1 on the following pages.Questions 1-7Reading Passage 1 has seven paragraphs, A-G.Choose the most suitable heading for paragraphs A-G from the list of headings below.Write the appropriate number, i-x, in boxes 1-7 on your answer sheet.List of Headingsi General points of agreements and disagreements of researchersii How much children really know about foodiii Need to take actioniv Advertising effects of the “Big Four”v Connection of advertising and children’s weight problemsvi Evidence that advertising affects what children buy to eatvii How parents influence children’s eating habitsviii Advertising’s focus on unhealthy optionsix Children often buy what they wantx Underestimating the effects advertising has on children1．Paragraph A正确答案：viii解析：作为开头段落，该段落前半部分先介绍了常见的面向儿童的广告内容，例如“Big Four”，而且介绍了食品促销的现状。