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历年真题4（Over the years 4）
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历年真题4（Over the years 4）
Chapter 1 Structure of polymer chain
1. explain nouns and concepts
Equivalent freely jointed chain segments. The mean square end-to-end distance Junfang radius of configuration and conformation
2., two kinds of polymers are known as PE. How do you identify which one is HDPE and which one is LDPE? Give three methods and explain the basis.
3., the average polymerization degree of poly alpha olefin is 500, and the mean square end-to-end distance is 625 Nm2. (1) the rigidity factor sigma of molecular chain rotation is blocked. (2) as a unit of independent motion of macromolecules - chain length B. (3) a large molecule containing the number of segments Z. (4) the number of structural units in each segment.
4. it is assumed that the average polymerization degree of PP is 2000, the bond length is 1.54, and the bond angle is 109.5o. In the theta solvent, the chain length of the equivalent free link chain is B.
5. write the various possible configurations of polyisoprene (excluding bonding isomerism).
6. what is the configuration of a chain? Isotactic polypropylene can through chemical bond (C-C bond) in the "same" rotation into "between", why?
7. what is the structural difference between natural rubber and Guta rubber? Painting structure.
8., if the mean end distance of a free link chain (Dan Xilei) is increased by 10 times, how many times must the polymerization degree be increased?
What is the fundamental reason for the flexibility of the 9. molecular chains? What are the physical parameters that characterize the flexibility of polymer chains? How are they defined?
(11., PE, PS, II, PP, PAN, PVC, PP, PIB (polyisobutylene)
PE and cis 1, 4 polybutadiene, poly (ethylene glycol adipate) polypropylene (Quan Tong) poly two siloxane
10 assuming that PP is in toluene solution at 30 DEG C, the unperturbed dimension (h02/M), =8.35 * 10-4nm, sigma = (h02/hfr2), =1.76, and (1) the chain length of the equivalent free orientation chain of this polypropylene is m
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Just over 10 years ago, Ingmar Bergman announced that the widely acclaimed Fanny and Alexander would mark his last hurrah as a filmmaker. Although some critics has written him off as earnest but ponderous, others were saddened by the departure of an artist who had explored cinematic moods&from high tragedy to low comedy&during his four-decade career.
What nobody foresaw was that Bergman would find a variety of ways to circumvent his own retirement&directing television movies, staging theater productions, and writing screenplays for other filmmakers to direct. His latest enterprise as a screenwriter, Sunday&s Children, completes a trilogy of family-oriented movies that began with Fanny and Alexander and continued with The Best Intensions written by Bergman and directed by Danish Fihnmaker Bille August.
Besides dealing with members of Bergman&s family in bygone times&it begins a few years after The Best Intentions leaves off&the new picture was directed by Daniel Bergman, his youngest son. Although it lacks the urgency and originality of the elder Bergman&s greatest achievements, such as The Silence and Persona, it has enough visual and emotional interest to make a worthy addition to his body of work.
Set in rural Sweden during the last 1920s, the story centers on a young boy named Pu, clearly modeled on Ingmar Bergman himself. Pu&s father is a country clergymen whose duties include traveling to the capital and ministering to the royal family. While this is an enviable position, it doesn&t assuage problems in the pastor&s marriage. Pu is young enough to be fairly oblivious to such difficulties, but his awareness grows with the passage of time. So do the subtle tensions that mar Pu&s own relationship with his father, whose desire to show affection and compassion is hampered by a certain stillness in his demeanor and chilliness in his emotions.
The film&s most resonant passages take place when Pu learns to see his father with new clarity while accompanying him on a cross-country trip to another parish. In a remarkable change of tone, this portion of the story is punctuated with flash forwards to a time 40 years in the future, showing the relationship between parent and child to be dramatically reversed. The father is now cared for by the son, and desires a forgiveness for past shortcomings that the younger man resolutely refuses to grant.
Brief and abrupt though they are, these scenes make a pungent contrast with the sunny landscapes and comic interludes in the early part of the movie.
Sunday&s Children is a film of many levels, and all are skillfully handled by Daniel Begman in his directional debut. Gentle scenes of domestic contentment are sensitively interwoven with intimations of underlying malaise. While the more nostalgia sequences are photographed with an eye-dazzling beauty that occasionally threatens to become cloying, any such result is foreclosed by the jagged interruptions of the flash-forward sequences&an intrusive device that few filmmakers are agile enough to handle successfully, but that is put to impressive use by the Bergman team.
Henrik Linnors gives a smartly turned performance as young Pu, and Thommy Berggren&who starred in the popular Elvira Madigan years ago&is steadily convincing as his father. Top honors go to the screenplay, though, which carried the crowded canvas of Fanny and Alexander and the emotional ambiguity of The Best Intensions into fresh and sometimes fascinating territory.
Over the years critical views of Bergman’s work have ().
A. without exception been positive
B. deplored his seriousness
C. often been antithetical
D. usually focused on is personality
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B. It is renewed each season.
C. Our lives are short in comparison.
D. It is an essential part of our lives.
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感谢您的反馈，我们会尽快进行适当修改！overtheyears和fortheyears有什么区别么_百度知道
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1、over the years 的意思是“这些年来”“经过这么多年之后”“最近几年”，通常表示的是从现在算起的过去几年，因此通常与现在完成时连用。如：My tastes have changed enormously over the years. 几年来我的爱好有了很大改变。2、for the （last few） years 表示“近几年以来”,多与完成时态连用，含持续时间的意思。The controversy has waged for the last  few  years. 近几年以来,论战一直在进行.
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前者表示在这几年内，后者表示长达几年。望采纳。
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我们会通过消息、邮箱等方式尽快将举报结果通知您。【英语】in,during,over,for后面都可以接一段时间,有什么不同?-学路网-学习路上 有我相伴
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during和in的区别和用法during强调的是过程..[在....期间]duringtheday/thewarin的使用就很广泛.可以用在时间inamonth一个月内地点inthehouse在屋子里状态inprogress在进行中服装a...in与during的区别是什么?during是在……期间的意思,它比in更强调过程爱因斯坦在战争中经历了很多,这句话强调经历了很多这个动作在战争期间一直持续,所以用duringin与during的区别是什么整个夏天我们每天都去游泳。Theylivedabroadduringthewar.战争期间他们一直在国外。例如在……的时候Hediedduringthenight.他是在夜里去世的。in的用法...in和during和一起用吗比如induring,以及两者区别不能一起用in强调在某某时间段里during强调在某某时间段的过程中during也可以跟表示时间的名词,比如duringmystay。这里不能用inin,during,over,for后面都可以接一段时间,有什么不同?in表示时间,一天中一部分during在....期间/当...的时候over在上for为/给/替inthemorning.duringthenight.overthetwodays.for20years.in,during,over,for后面都可以接一段时间,有什么不同?(图3)in,during,over,for后面都可以接一段时间,有什么不同?(图8)in,during,over,for后面都可以接一段时间,有什么不同?(图10)in,during,over,for后面都可以接一段时间,有什么不同?(图13)in,during,over,for后面都可以接一段时间,有什么不同?(图15)in,during,over,for后面都可以接一段时间,有什么不同?(图17)这是用户提出的一个英语问题,具体问题为:in,during,over,for后面都可以接一段时间,有什么不同?我们通过互联网以及本网用户共同努力为此问题提供了相关答案,以便碰到此类问题的同学参考学习,请注意,我们不能保证答案的准确性,仅供参考,具体如下:in,during,over,for后面都可以接一段时间,有什么不同?in表示时间,一天中一部分during在....期间/当...的时候over在上for为/给/替inthe防抓取，学路网提供内容。用户都认为优质的答案:during和in有什么区别??请举例说明!!during是指一个持续的过程,in是指在这个过程里.DURING:在…的期间;在…的时候。duringtheday[morning,evening](在防抓取，学路网提供内容。in 表示时间,一天中一部分&withininduring&都是"在...里"的意思,那它们有什么区别?within在---时间之内in在....时间后during在...过程中如:iwillbackin5d防抓取，学路网提供内容。during 在.期间/当...的时候duringforin的用法及区别1.during和in表示发生在整个时间段内的某个时候,跟特定期间的词,即时间长度明确,起止时间确定:during/duringthes防抓取，学路网提供内容。over 在上ThestoryhappenedinVietnamduringthewar.Aduringthewar.Abomb___1___inanorphanageandseveralchildrenwerew防抓取，学路网提供内容。for 为/给/替 手机短信内容有8du.in/5-2y1e是什么意思？问：朋友收到一条短信，短信内容后面有如上的内容，请问是什么意思答：手机开机出现乱码，可能是软件或者系统出现问题，建议您：1.重新开关机查看是否可以进防抓取，学路网提供内容。in the morning.8du.in/5w3iw8什么意思答：操作系统防抓取，学路网提供内容。during the night.电脑开机后出现visualstudiojust-in-timedubugg...问：百度提问：电脑开机后出现visualstudiojust-in-timedubugger,选NO的...答：朋友，电防抓取，学路网提供内容。over the two days.求P-rideKatha-Sowieich中英文歌词答：154641hkggjdffgxd防抓取，学路网提供内容。for 20 years.英文歌里面一句歌词大概是there”sawinterinthe...问：英文歌里面一句歌词大概是there”sawinterinthecorner前奏是很长一...答：cryonmyshoulder-防抓取，学路网提供内容。======以下答案可供参考======werethereanylikesintangdunasty?的解答答：在唐朝有什么爱好吗？likesn.爱好，喜欢的东西;希望能帮到你，如有疑问，可追问~防抓取，学路网提供内容。供参考答案1:duration,interval之间的区别，duration的是持续...答：隔一分钟打一次雷，每次雷持续响半分钟。一分钟就是interval，半分钟就是duratioin防抓取，学路网提供内容。in + 将来时WieInEinemFilm德语歌词翻译成中文谢谢了！问：ichschreibmeindrehbuchunderz?hldadrinichtreffedich,obdus...答：ichschreib防抓取，学路网提供内容。during 一般+过去时介绍贵州特产的英语作文答：DuyunMaojian,alsoknownas&hooktea&,&Buxustea.&ProducedinGuizhouDuyun防抓取，学路网提供内容。over for 不一定的Ichliebedichimmernochsosehr歌词翻译问：Ichliebedichimmernochsosehrduschlie&tdichinmeinhe...答：Ichlieb防抓取，学路网提供内容。供参考答案2:防抓取，学路网提供内容。in 20 years 在20年之后 没生孩子前标准身材，100斤，自从生了儿子之后体重一路飙升，二胎政策后老公还想要一个，好吧，咬咬牙生下二胎，为了当个合格的奶牛，每天拼命吃吃喝喝，体重又是一路飙升。说实话，胖人的痛苦真的只有自己才知道防抓取，学路网提供内容。during 20 years 在20年之内 你们觉得唐艺昕的眼睛好看吗？她就是“桃花眼”说到唐艺昕，大家应该都会想起那个短发精灵爱笑甜美在所有场合都带着一双会笑眼睛的小仙女唐艺昕有一双极具灵气的双眸，笑起来露出的浅浅梨涡，沁人心脾。有人说，唐艺防抓取，学路网提供内容。over(the) 20 years 在过去20年中 一、顾名思义，碎银子就是从银子上敲下来的一小块。就是把整块银锭剪碎了用。有很多人会直接将整银子掐碎，或者在整块银子上掐掉这个小角。这里就会出现一个问题：剪下来的银子会不会不够价格。这就需要一把秤，一般防抓取，学路网提供内容。for 20 years 持续20年中国琥珀　　中国琥珀多是透明的，桔色或是红色。在美国自然博物馆中收藏有大块的中国琥珀雕件。在辽宁省抚顺附近可以收集到含有昆虫的琥珀。年龄在3千5百万至5千7百万年。中国的琥珀主要产在新生代第三系泥砂质防抓取，学路网提供内容。供参考答案3:MicrosoftInternetExplorer402DocumentNotSpecified7.8Normal0收到邀请的时候，正在读一本书，还没读完，这本书就是布热津斯基的《大棋局――美国的首要防抓取，学路网提供内容。打个很简单的比方:in 20 years：在20年之后帕萨特和迈腾其实可以统称为帕萨特，迈腾是中国“特供”产品名字，二者从根本上的区别是这样的：迈腾的原型是原汁原味的德国版帕萨特，而上汽大众帕萨特则是德国帕萨特的美版车型（美版与德国版在底盘结构上存在一些防抓取，学路网提供内容。during 20 years 在20年之内对于长时间分居两地的夫妻来说，其实最重要就是两方面的问题。第一，夫妻双方长期分居容易导致出轨，也是出现的可能性最高的问题。很多夫妻在刚开始都会觉得为了自己更好的工作，一切以后可以弥补。但是如果你的爱人防抓取，学路网提供内容。over(the) 20 years 在过去20年中csdn图谱很多同学接触Linux不多，对Linux平台的开发更是一无所知。而现在的趋势越来越表明，作为一个优秀的软件开发人员，或计算机IT行业从业人员，掌握Linux是一种很重要的谋生资源与手段。下防抓取，学路网提供内容。for 20 years 持续20年中国琥珀　　中国琥珀多是透明的，桔色或是红色。在美国自然博物馆中收藏有大块的中国琥珀雕件。在辽宁省抚顺附近可以收集到含有昆虫的琥珀。年龄在3千5百万至5千7百万年。中国的琥珀主要产在新生代第三系泥砂质防抓取，学路网提供内容。during和in有什么区别??请举例说明!!during是指一个持续的过程,in是指在这个过程里.DURING:在…的期间;在…的时候。duringtheday[morning,evening](在)白天[早上,晚上]。duringandafterthecrisis在危机期...&withininduring&都是"在...里"的意思,那它们有什么区别?within在---时间之内in在....时间后during在...过程中如:iwillbackin5days五天后回来---指过完5天就回来,不多不少,不会第四天回来,也不会第六天回来,而回来时刚好五天...duringforin的用法及区别1.during和in表示发生在整个时间段内的某个时候,跟特定期间的词,即时间长度明确,起止时间确定:during/duringthespring=inspring(注意冠词的用法)。2.during和...ThestoryhappenedinVietnamduringthewar.Aduringthewar.Abomb___1___inanorphanageandseveralchildrenwerewounded,___2___an8-year-oldgirl.Peoplefromthevillage___3___medicalhelpfromthenear...
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