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托福真题

小升初作文真题 时间:2010-04-07

【www.jinghuajt.com--小升初作文真题】

第一篇托福真题:2016年托福考试ibt真题解析


  在已经过去的2016年托福考试中,ibt专区有哪些真题值得解析的呢?为此百分网小编为大家解析2016年托福考试的ibt专区真题。
  2016年托福考试ibt真题:写作
  T1:
  Ø Topic:Peru沙漠里的一种地形Nazca lines,关于Nazca lines存在的三种理论
  Ø 阅读1:作为astronomical calendar,去跟踪一些特殊的events,比如说冬至。也有发现表明它确实与一些天体有关系。
  Ø 阅读2:for monumental arts, 总而彰显当地的文化和地位及重要性。就像埃及见金字塔一样。
  Ø 阅读3:人们留下的足迹。有可能最为跑步的赛道。
  Ø 听力1:阅读里没有提到有sky中很多天体这一事实, 所以阅读里所说的相关可能只是偶然。
  Ø 听力2: 实际上这些lines 很大,只有在高空中才可以看到它的全貌,而如果站在附件的话,不能够进行识别,也不会给人留下深刻的印象。
  Ø 听力3:这些lines有一些是images of animals, too complex for human’s footstep.另外听力推测,当地有宗教习惯是走一些不寻常的路径,所以有可能这些lines是religious ritual留下来的。
  Ø Sample answer
  The writer and the speaker have a debate on why Nazca Lines Images were created. The writer puts forward three theories, which are opposed by the following lecture.
  First, the writer claims that they are astronomical calendar, because there is relationship between images and planets/stars. While the speaker views this issue from an opposite angle, according to him/her, in fact, images and astronomical events do not match vastly. Since there are numerous stars in the sky, only a small part of images match astronomical planets just by chance.
  Secondly, the passage states that people in Peru want to use Nazca Lines images to show off their cultures and achievements. However, the speaker casts doubt on this opinion by saying that the Nazca lines are so huge, so that people can only see it above high level. Images will be impressive when seen from overhead. Pyramids are impressive because they are huge and tall.
  Last, the writer argues that the images are used for racetracks. By contrast, in accordance with the speaker, this claim does not hold water. When travelling, people can use more convenient Mark, such as tree. Some images like spiders and monkeys are too complex for people to track. Besides, it is more likely that the images are used in rituals. Religious ceremonies include walking.
  T2:
  Ø 原题:The government can take a variety of actions to help protect the environment. Which one of the following do you think is the most important for the nation’s government to take to protect the environment.
  1. Fund the research to develop environmentally friendly energy sources such as solar and
  wind energy.
  2. Preserve the natural places like forests and protect the animals that live there.
  3. Enforce laws to prevent the pollution of air and water by large companies.
  Ø Sample answer
  Taking a panoramic view of human history, we can readily find that the natural environment plays an enormously important role in determining the future of each and every country. Given the great significance of clean environment, the general public as well as the governors begin to wonder which one is the most essential action to protect the environment among the following three options: funding new energy research, preserving natural habitat or enacting strict laws. Towards such a long-running tug-of-war, I am inclined to argue that national governments should invest financial support in developing new energy sources.
  Initially, spending more money in discovering new energy can radically solve the various environmental problems. As is common sense, the deteriorating environment is the result of the overexploitation of fossil fuels, including coal, oil and natural gas. To be specific, numerous chemical plants usually burn the coal to provide power for manufacturing all kinds of goods designed to satisfy the basic needs of the general public. As a result, a large amounts of industrial wastes are discharged to take a toll on the natural environment. Also, an increasing number of petrol-powered automobiles will definitely emit car exhaust (e.g. fumes and toxic gas), which can increase the likelihood of the public suffering from respiratory diseases. All the above problems related to environment can be resolved by find new and clean energy like solar energy, wind power and tidal power. Undoubtedly, replacing the traditional energy with the new ones can dramatically decrease the pollution and contamination, thus leading to a better living environment. For example, once the cars uses the electricity instead of petrol, the air quality will improve to a large extent.
  Secondly, there are conspicuous limitation of the other two options. As for preserving natural places, the effect of this practice is relatively restricted. To illustrate, the traditional energy sources are usually exploited and discovered in the natural places. Consequently, the preservation of natural places will hinder the access to various energy and thus impede the progress of the whole society. Also, the same logic applies to passing laws to reduce pollution. It is an indisputable fact that across the globe, many countries now are heavily dependent on the industries and factories which produce pollutions. In other words, once the law of punishing these companies is enforced, these corporation may have to cut down their output and make less profits, even ending up going bankrupt. Accordingly, the national economy and the living standard of the public will suffer too.
  Factoring what has been discussed above, we can conclude that funding research of environmental friendly energy will be more preferable, because finding proper alternative energy is the key to solving the environmental problems comprehensively.
  2016年托福考试ibt真题:听力
  C1:
  大意:学生想上Smith的中世纪的文学课,但是人数已满,学生问听力中的教授可不可以签字授权上Smith的课,教授说应该不行,因为Smith教授对政策很严格,除非有人放弃课程。后来教授问她是不是对中世纪文学很感兴趣,学会说不是因为感兴趣,而是因为学业要求,教授说他有一门英国文学课也是中世纪的。学生问她怎么没看到,教授回答是因为改时间了。学生最后问晚不晚,教授说现在报名不晚。
  L1:
  大意:关于Script, 讲Script代表着口头语言的文字信息。但是破译(decipher)Script是一项很费事的工作。后来引入Ugaritic tablet, 这个概念应该表示一种Script,后面重点讲解对它的破译。首先解释了Ugaritic 有两类,涉及到30 symbols. 它与其他语言的关系主要体现在和Ancient Hebrew存在关联(重点!!!)对它的破译用到five axes, 好像是结果只破译了4个symbols.而且这种人工破译耗时非常久。后来发明了一种电脑项目来破译,只需要几个小时,这种破译采取两种方法,一个是与letters顺序有关,一个是words structure.后来表示教授的态度,他认为传统破译法不成功,而这种电脑破译在建立语言的关联性上是有突破性进展的。
  L2:
  大意:讲的是star对于planet起着支撑作用,planet有outward pressure 和inward pressure(即重力)从而形成平衡,后面主要讲的是star消亡之后就会变成white dwarf, star在消亡的时候会expand,并且regiant,而且会释放热量,但是比太阳释放的少,后面引入Pulsar的概念,讲的是died Pulsar.在消亡的时候会爆炸。
  C2:
  大意:一个学生到教授这里找兼职,教授说共有二十多种兼职,但是很多已经被选了,学生感到很惊讶,为什么这么快,教授解释说因为她上周没有来。教授说有两种工作现在她可以选择,一个是bookstores position,但这个工作是比较routine的工作,另一个工作是电脑操作的工作,但是这个比较demanding,要求一些电脑技巧,学生回应说高中的时候有做过志愿者工作,是关于操作电脑的,所以对她来讲不难。后来教授就给了她一个电话号码,应该是让她打个电话准备面试。
  L3:
  大意:新的物种迁徙到某地的时候会影响到当地的生态系统,后面重点讲的是,澳大利亚草类入侵。一些人在移居澳大利亚的时候带来的new grass,但是这些new grass不能适应当地的极端的环境。但是专家却很喜欢这些新草类,以为当地的草类受到破坏。后来问题是,这些新草类就像杂草,对当地的草构成威胁(crow out the native species), 因此当地政府鼓励民众种植对农业有帮助的草,于是他们种植了一种叫weeping grass的草,是因为它含有大量的蛋白质(protein)。农民并且将其引到市场上,这种草的优点:1. Hardy 2. Deep routs, 有望发展成为 pasture grass.
  L4:
  大意:讲的是film history, 上节课讲的是Classical movies, 这节课重点讲的是Naturalism,他的先驱是William Bloch, 特点的是要求对每一句台词都要非常认真严肃,在讲完每一句台词时都要停下来,目的是酝酿下一句台词。在Naturalism之前,只需要排练三次,但是这个Naturalism,要排练二十多天,而且每次排练完还要准备。后面讲,Bloch是受到电影 Church and organ中女主表演的影响,她在表演的时候音调多样化,深情并茂的,每一句台词后都会停顿。但这部电影里还有一个男演员,主要利用手势表达感情,体现了classical的结合。
  C3:
  大意:鸟的迁徙。男student: Professor, I hope to discuss my term paper with you. I got stuck in writing the paper on bird migration. I have difficulties in finding enough materials about bird migration. (老师,今儿,我想跟你说说我的学期论文的事儿。我卡住了,找不到这方面的资料。)
  女Professor: You can’t find enough material on bird migration?(语调上扬,最后一题,重听题的考点。)
  男student: I want to write about early bird migration.( 要写的paper是关于古代鸟类迁徙的,所以资料不够。)
  女Professor: “哦你确实找到了一个好的题目,但是你要知道我的要求是你们的论文要反映你们这学期学了什么。”
  男 student: 想写关于Aristotle关于这个题目的看法 etc.
  女 Professor: I want you to apply what you’ve learned to your paper. (希望他们运用所学知识研究来完成paper.) 不要只是做 summary or description. 我想要看到你的special analysis.
  男 student: 但是,我觉得我找的资料中有错误的。 (I think ….wrong)这就是为什么我不想用资料。
  女 Professor: 你不要完全放弃以前找的资料(discard). 你可以换种想法,用rational 的方式。这就是我们说的critical thinking,不一定非要同意资料。可以写以前的(historically) old theory, 然后现在的这些新研究 (current research) 如何支持(support)或者驳斥这些theory.
  男 student: 我想可以写bird migrate at night。人们大多只看到大鸟,所以认为小鸟在大鸟的翅膀下迁徙什么的,其实新发现是因为小鸟晚上飞(通过说这个topic来验证自己理解了老师的意图change the topic from ancient to recent)
  女 Professor: That shows your thinking. (对,这样就是我们需要的思考能力)
  男 student: 我想写一种不迁徙而是冬眠的鸟。I want to write about the birds that do not migrate. They hibernate during winter.
  女 Professor: 如果我是你,我就不会在一份15页的论文中写这么多。(If I were you , I would not….. The paper is 15 pages…)不过,想法挺不错。建议你以后每周(in a week)都来找我,看一下他写论文的新的方向(new direction)进行得如何。
  L5
  大意::教授一开始就介绍植物分类,提到分类中的species种,genus属,order目。说植物的classification 很难,一些特性比较特殊的植物特别是这个样子。提出植物的分类不能完全依靠它flower的形态和特性。提到Rafflesia(大王花),开花石会散发腐臭的味道,以吸引蝇类传播花粉。但是Indonesia有一种植物M,它的flower很特别,超级大(图片显示它的直径有一个手臂这么长,颜色为绛红),有难闻的味道,最后发现他们不是一个order 的。
  大王花生长在很恶劣的环境中,其它的植物都不能生长(题目一:它生长在什么样的环境当中?) 这种植物有食物的来源,但是它还是会抓insect吃,因为它不能从土壤中得到足够的营养,所以要通过这种方式来获取所需的营养(题目二:为什么吃虫?)
  然后教授说了它怎么抓虫的。经过很长时间的研究,专家发现它和violet(紫罗兰)、willow(柳树) 等是属于一个order的,后提到幼时的violet,也会散发那种smell的。
  提到共存(考题)。另一种南美洲的植物和它是同一目的,但是花很小,味道也不难闻,与蓝莓共生coherent。学生提问不能测DNA吗,教授说这种大花基本不进行光合作用,没法提取一般植物能提取到的DNA。在DNA分析技术成熟之前根本无法将他们并为同类,由于他们的特征差异太大。
  教授还提到这种植物的交配不易,其一气味难闻致使传蜜的动物不易接近,其二它每年只开一次花,且花分雌雄。所以要这么多先天条件凑齐不易,所以很少有人有机会看到开花的全过程(考题)。结论,不可以貌取人。
  后来又讲了这种花很有可能灭绝,原因是要fly帮忙运花粉,要同种的花在一起等等,要这些条件同时发生,是小概率事件。
  L6 :
  大意:Ragtime介绍了一种流行于美国19世纪左右名为ragtime的音乐,能够表现年青人的活力(spirit of youth)之类的,此乐流行是由于piano的关系,因为两者真是太搭配了。在那个年代,在各种场合都用钢琴。此乐当时流行程度和Rock & Roll在某一时期一样(这里出现考点)。
  女学生说了一堆后,来了一句 I just don’t get it,意思是要教授explain,还说piano 之所以当时那么受欢迎,一是因为它能与音律产生和谐,另一是因为当时它算一种财富地位的象征symbol of wealth and status。再加上,那个年代,大家都没钱,就去public concert or restaurant听音乐,而piano声音够响亮,又和ragtime music rhythm搭配的天衣无缝,所以,两者相得益彰这个音乐年轻人很喜欢,因为很有激情。除了流动演出,park演出等不用钢琴,因为难搬(出现考点)because of transportation problem。 同时,ragtime也是 jazz的前身,因为演奏者不按牌理出牌,一首曲七个人弹,弹出七种调。这种ragtime音乐影响很远啊,例如现在的jazz就是从那发展来的。
  托福听力的备考攻略
  1.托福听力记笔记
  对于有过托福考试经验的同学来说,近年来托福考试中变化最大的部分可能就是听力部分了。除了更长的听力时间、更难的文章深度以外,光是先听再做盲听的模式就够很多考生头疼的了。正是因为有了这些原因所以托福听力笔记这个方法大家就更不能弃用,而且还要把它用好,平时练习的时候可以不限于听力真题的音频来练习,可以通过SSS、科学美国人、VOA等资料来练习记笔记,效果应该会很明显。
  2.托福听力对话备考策略
  托福听力考试有两种音频形式即对话和讲座,对于这两部分内容中,校园对话通常被认为是最容易拿高分的部分,所以这可以做为考生前期备考托福的突破口。但某些考生往往在备考中后期发现,对话的正确率往往又成为他们冲击听力高分过程中的绊脚石。所以考生需要从对话的考察点和相应备考重点2个方面进行备考,旨在帮助大家突破听力对话瓶颈,为听力部分得分打下坚实的基础。
  3.托福听力讲座备考策略
  托福听力考试中有4篇讲座内容,很多同学在这部分失分最为严重。提到讲座,学生普遍想到的第一个感触就是:充满着专业术语和长难句,文段六分钟走神七八次。下面,笔者会带着大家一起走进托福听力的讲座,从三个方面逐个攻破这一“世纪难题”。要知道托福听力的讲座就如同大部分的学术文章,是遵循一定的逻辑顺序的。把握好一篇学术文章的逻辑框架,会使我们听力的时候重点更突出,有时甚至能帮我们直接定位出关键词来答题,这就是众多听力老师所强调的“结构听力法”。

第二篇托福真题:托福考试写作真题范文


  大家在托福写作复习中首要的复习资料就是托福写作历年真题,托福写作的提分最重要就是大家的做题练习,巩固加强各项知识点,因此小编为大家搜索整理了托福考试写作真题范文,希望对大家有所帮助!
  篇一:
  现在有一些学校require children(5-11岁) to work together instead of working on their own during most of their learning process, do you agree or disagree that is the best way to teach children?
  托福写作模板及参考答案:
  Do you agree or disagree with the following statement? Many schools require young children (aged 5-11) to work together in a small group instead of working alone to learn man activities.
  Educators and researchers have never stopped the examination of the importance and relevance of collaborative learning that are encouraged by middle schools. When compared with studying alone, I, personally, believe that it is far more beneficial to students when working in groups for the following reasons.
  First off, working in a group can be very conducive for students since they can help students to study more effectively and thus tackle real-world issues. A recent study conducted by University of Minnesota backed up the claim that study teams, collaborative learning and group projects are far more effective in helping students to develop useful skills than traditional teacher-led teaching approach. In fact, when learning in groups, students have to do some research about the topic they are expected to discuss beforehand, which helps them to clear up some misunderstandings and boast their enthusiasm in academic exploration. Clearly, working in a group can help students to retain information for a much longer time and have a much deeper understanding of some concepts and ideas. Consequently, if teachers categorize students and organize them in small study groups, chances are that they would solve complex issues together, like researching the history of the city, examining the water quality of the local town, so on and so forth. Students can develop critical thinking skills as well as learn to collect and analyze information from multiple sources.
  Additionally, working in groups has much deeper implications beyond students’ academic experience. As the saying goes: “many hands make light work”. Actually it remains as relevant today as it did a century ago. To be more specific, working together helps to develop skills like cooperation, organization and leadership. When learning in a group, every single student gets a chance to contribute their knowledge to the group, and they can learn to appreciate the work of other students simultaneously as well. What’s more, they have to work closely with others for the same goal otherwise they might not be able to compete with other study groups. More importantly, students will get exposure to distinctive perspectives and at the same time learn how to accept different points of view and find common ground in this process. Such an educational experience will not only be helpful for their future study but also beneficial to them when they have to deal with coworkers, clients, and teammates in a professional setting in the future. Numerous studies have shown that students who have prior experience working with others enjoy a better chance to be successful in their future career.
  In conclusion, working together in a group has far more meaningful implications than working alone since collaborative learning helps students to learn much more effectively and develop important skills that are vital for their future study and career.
  篇二:
  真题回顾
  A/D: People can solve important problems in their daily life on their own or with the help from families; The help from the government is not necessary.
  文章点睛:
  题目大意:人们可以自己或通过家人的帮助来解决生活中的重大问题,所以政府的帮助是没有必要的。波波建议此题目选择不同意,即认为政府的帮助还是很有必要的,思考分论点的方向使用拆分,对题目中的抽象名词 important problems 拆分具体化为环境问题和教育问题,然后分别展开。
  参考范文:
  In a society that changes as amazingly as ours, the role played by government in our daily life has been brought under the spotlight of mass media. Consequently, the general public and sociologists are wondering whether people can solve important problems individually or with the governmental support. Towards such a long running tug-of-war, I am inclined to claim that the help from government is necessary in the process of resolving important problems, especially in the aspects of protecting environment and addressing the disparity of educational resources.
  In the first instance, consider the environmental issues. As is common sense, the deteriorating natural environment is so severe and complicated that the solution of such a problem is far beyond the reach of any individuals or families. The serious air pollution in China is a good case in point. Despite the fact that people can take some actions such as wearing masks or taking the public transportation to relieve the haze occurring frequently in the major cities of China in some degree, the problem cannot be radically solved. To illustrate, the major cause responsible for the smoggy weather is nothing but the emission of waste gas such as dust and smog from an appalling number of heavy-pollution factories. In this case, it is the government that can get rid of the fundamental cause by shutting down these plants and enacting laws or regulations to restrict their production, which can"t be achieved by any individuals.
  In the second instance, the same logic goes to the educational problems. As is known to all, many school-age children in rural and remote areas are not able to receive education in school due to the lack of educational resources. According to a survey conducted by the Education Ministry in China in 2015, approximately 3 million kids in the Southwest of China didn"t have the chance to get educated on account of lacking in tables, textbooks and even spacious classrooms. When confronted with the issue mentioned above, what individuals or families can do is quite limited. Undoubtedly, only the government has the adequate financial resources and power to allocate educational resources to those places. For example, the government of China builds nearly 10,000 primary schools called Hope School in the distant places, which alleviates the disparity in educational resources between different regions to a large extent.
  Judging from what has been discussed above, we can draw the conclusion that although the ability of individual or families is becoming stronger and greater than before, the help from government is of great necessity in the course of solving significant problems, especially those in the areas of education and environment.

第三篇托福真题:新托福阅读真题全解析怎么样


  从题型来看,托福阅读的特点是题量大,涉及的词汇面广。下面是百分网小编整理的新托福阅读真题全解析,希望对你有帮助。
  新托福阅读真题全解析
  文章内容小结题
  这是托福阅读考试中经常出现的题目。顾名思义,是对全文内容的总结,考察的是对文章主旨和段落主旨的把握。正确选项是一些总结性的选项,错误选项的特点是:与原文不符,原文没有提到,或者是次要信息。次要信息也就是文中提到的某个细节性的信息,次要信息的选项具有极大的干扰,在做题时应注意识别。
  句子简化题
  这种题型的主要考查目的是:考查理解文章中某一特定复杂句子所传达的基本内容,并不受细枝末节的干扰,用简化的句子表达原句基本内容的能力。因此,语法水平在解题过程中就显得尤为重要。这种题目在托福阅读中的具体表现是题目中有“high sentence”。
  修辞目的题
  这是托福阅读题型中比较难得分的题目,这种题目注重考察单词,短语或句子在句子之内或句子之间起到的作用,这就要求平时阅读时,在涉猎原文细节信息的基础之上,要有意识地注意句子之间的逻辑关系以及段落的结构。
  事实否定题
  在解答这种题目的时候首先要注意的是避免惯性思维的影响。平时在做题习惯当中,看到与原文相符或者和原文一样的选项就选,但是到了这个题目,需要选择不属于题干内容或者与原文相反的选项,这是需要注意的一点。
  插空题
  这些题目中的一些较为复杂的逻辑关系会可能会造成失分。在解答托福阅读插空题,首要任务就是要找到线索词。也就是能够让了解句子之间逻辑或者语法联系的词,线索词亦是解题的关键。
  托福阅读备考的3个潜规则
  1、备考阅读不能忽视做题技巧
  在托福阅读的答题过程中不仅要掌握科学的备考方法,还需要掌握一些做题的技巧。例如说在议论类型的阅读题当中,我们同学可以按照“一线三定位”方法来解答。
  ”一线“就是议论文中存在的一条主基线,文章都是围绕这条线来展开。”三定位“就是定位题干关键词、定位与题干想干的段落、定位中心思想找出论证。按照这样的方法去解答议论类型题,我们可以既又准确又快速地解答出题干的答案,也能为其他模块的考试节省下很多时间。
  2、尽快提高阅读速度
  在平时的学习、训练中积极扩大托福阅读词汇量。词汇是学习任何一门外语的基础,如果没有一定的词汇量作为基础,很难想象我们能较为顺畅地去理解一篇英文文章的内容,也就更别提去提升我们的阅读速度了。托福阅读速度的提升一定是要建立在读懂文章的基础之上的。
  平时如战时,阅读时注意力要高度集中。如果我们的思维很难与作者想表达的意图产生共鸣,从而从根本上影响我们的阅读质量和速度。长期大量阅读,语言的学习从本质上说有一个渐进的过程,这就决定了我们语言水平的提升要经过一个量变到质变的阶段,而长期大量的阅读就是其中最重要的一点。
  3、备考“英语化”,适应考试潮流
  在托福阅读的练习过程汇总,英语的思维方式。从宏观层面说,英语思维是一种较为典型的线性思维、结果思维其不同于汉语的点性思维,而我们广大学生在这一点上的相对空白,使得他们在实际的阅读中,要不断地把英文下意识地转化成中文再进行做题判断,进而大大影响做题速度。
  针对这一点,我们就必须要下大力气来提高我们的综合英语实力以及语言运用能力。在平时的备考中多多背诵一些习语和惯用搭配,更加深入的了解托福阅读文章。
  托福考试阅读技巧
  1、增强对于背景知识的了解
  在托福阅读考试中,要求考生掌握的单词在8000左右,而且在托福阅读考试中出现的内容一般都是比较学术的,虽然本着公平性的原则,ETS不会对某个专业考察的过于深入,但是如果考生对于托福阅读考试中文章中主要讲述的内容一点都不了解,那么势必会拖慢我们的阅读速度。因此小编建议考生在备考的时候多多的阅读,多读一些关于人文知识,社会知识,历史知识等方面的文章,在开阔自己眼界的同时,提升托福阅读速度。
  2、学会放弃
  在托福阅读考试中,如果考生真的遇到了自己不认识的单词,或者是怎么分析也找不到头绪的句子,不建议考生一直反反复复的阅读,浪费大量的时间。考生可以先适时的放弃,到最后如果题目中涉及到了这些内容,在理解全文的基础上,再反过来进行分析。
  3、学会翻译
  在托福阅读考试中会大量的出现长难句,很多考生在面对这些长难句的时候,往往还会采用传统的翻译方式,从前往后翻译,这样做的结果就是往往翻译到了最后,考生依然不明白这句话想要表达的观点是什么。因此小编建议,考生在托福阅读考试中,如果遇到了长难句,要先对它进行语法分析,找到句子的主干之后,再看句子的修饰成分。比如考生在回答TPO6 Powering the Industrial Revolution中的This “atmospheric engine,”invented by Thomas Savery and vastly improved by his partner, Thomas Newcomen, embodied revolutionary principles, but it was so slow and wasteful of fuel that it could not be employed(outside the coal mines)(for which it had been designed.)就应该先掌握这句话的主干部分是This “atmospheric engine, embodied revolutionary principles, but it was…,修饰部分是invented by Thomas Savery and vastly improved by his partner, Thomas Newcomen……
  然后再进行翻译,这一由托马斯赛佛瑞发明并由他的同伴托马斯纽科门对其进行改良的“大气引擎”,被赋予了革命性的工作原理,但其效率低下且浪费燃料,无法在煤矿以外的地区使用,这与最初的设计期望背道而驰。

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