Study on the comparison of the pyrolysis gas release of lignite and its briquette
高一英语学术研究方法单选题40题
高一英语学术研究方法单选题40题1. What is a research hypothesis?A. A statement that is always true.B. A prediction about the relationship between variables.C. A conclusion based on research findings.D. A question that needs to be answered.答案：B。
选项A，研究假设不是总是正确的陈述。
选项C，研究假设是在研究之前做出的预测，不是基于研究发现的结论。
选项D，研究假设不是一个需要回答的问题，而是对变量之间关系的预测。
2. What is a literature review?A. A summary of all the books on a topic.B. A critical analysis of existing research on a topic.C. A collection of research papers.D. A list of research questions.答案：B。
选项A，文献综述不仅仅是对一个主题的所有书籍的总结。
选项C，文献综述不是简单的研究论文集合。
选项D，文献综述不是研究问题列表。
3. What is a research method?A. A way to collect data.B. A theory about a topic.C. A conclusion from research.D. A list of research questions.答案：A。
选项B，研究方法不是关于一个主题的理论。
选项C，研究方法不是研究得出的结论。
选项D，研究方法不是研究问题列表。
4. What is a sample in research?A. A part of the population being studied.B. The entire population.C. A list of research questions.D. A research method.答案：A。
小学下册第4次英语第二单元期末试卷(含答案)
小学下册英语第二单元期末试卷(含答案)英语试题一、综合题(本题有100小题，每小题1分，共100分.每小题不选、错误，均不给分)1.The chemical symbol for lithium is ____.2.The kitten is very ______ (curious).3.Who is the author of "Harry Potter"?A. J.K. RowlingB. Roald DahlC. Mark TwainD. Agatha Christie4.The _____ (大树) provides shade in the summer.5.My mom enjoys __________ (制作) crafts with me.6.I like to help my dad in the ____.7.What is the smallest unit of life?A. OrganB. TissueC. CellD. Organism答案:C8.What do you use to write on paper?A. BrushB. PencilC. RulerD. Eraser答案:B9.My cousin is a ______. She loves to play with dogs.10. A __________ (化学比赛) fosters interest and knowledge among students.11. A ________ (小岛) is smaller than an island.12.My brother collects ____ (coins) from around the world.13.The _____ (花卉) industry provides many jobs.14.What sound does a dog make?A. MeowB. BarkC. MooD. Quack15.The ________ (symposium) features experts.16.How many players are on a soccer team?A. 10B. 11C. 12D. 1317.The chemical reaction between baking soda and vinegar produces _______.18.What do you call the liquid that comes from trees?A. GumB. SyrupC. SapD. Juice答案:C19.What is the name of the river that runs through Egypt?A. NileB. AmazonC. YangtzeD. Mississippi答案:A20.What is the primary ingredient in pancakes?A. FlourB. SugarC. EggsD. Milk答案:A21.What is the main ingredient in salad?A. BreadB. VegetablesC. MeatD. Rice答案:B22.__________ (化肥) provide essential nutrients for plants.23.The ______ is a plant that can grow very tall.24.ts can survive in ______ (沙漠). Some pla25.The __________ (生态平衡) is vital for our planet.26.Which of these is a type of weather?A. HappyB. RainC. FastD. Bright27.My favorite toy is a ______ (玩具名). It is very ______ (形容词). I play with it every day. Sometimes, I take it to the ______ (地方).28.What is the main ingredient in cookies?A. SugarB. FlourC. ButterD. All of the above29.The first woman to vote in the United States was ______ (苏珊·安东尼).30.What do we call a person who helps sick people?A. TeacherB. NurseC. EngineerD. Chef31.The main use of citric acid is in _____.32.What is 3 x 3?A. 6B. 7C. 8D. 933. A starfish can live in both ______ (海洋) and freshwater.34.My aunt, ______ (我的姑姑), is an amazing teacher.35.What is the capital city of Nicaragua?A. ManaguaB. LeónC. GranadaD. Masaya36.She rides her ______ to school. (bike)37.I have a toy _______ that can spin and twirl.38.What do you call the time of year when leaves fall from trees?A. SpringB. SummerC. FallD. Winter答案:C39.The ocean is ________ (广阔).40.The __________ is known for its diverse cultures.41.The process of filtration separates solids from ______.42.My sister enjoys __________ (参加工作坊).43.What do we call a person who studies ancient civilizations?A. ArchaeologistB. HistorianC. AnthropologistD. Geologist44.What do you call a story that is told using pictures?A. NovelB. ComicC. BiographyD. Poem答案:B45.What do we call a scientist who studies the weather?A. MeteorologistB. ClimatologistC. GeologistD. Astronomer答案:A46.are a famous ________ (阿尔卑斯山是一座著名的________) range in Europe. The Amaz47.The _____ (oranges) are fresh.48. A _____ (猫头鹰) hoots at night.49. A ______ (狮子) lives in prides with its family.50.The __________ (化学稳定性) of a substance refers to its resistance to change.51.She has a nice ________.52.can Revolution was influenced by Enlightenment ________ (理念). The Amer53.The garden is _______ (充满生机的)。
2022年考研考博-考博英语-中国财政科学研究院考试预测题精选专练VII(附带答案)卷9
2022年考研考博-考博英语-中国财政科学研究院考试预测题精选专练VII（附带答案）第1套一.综合题(共25题)1.单选题______ that as both birds and mammals become larger, their metabolic rates per unit of tissue decrease, and they generally live longer.问题1选项A.The truthB.It is trueC.If trueD.To be true【答案】B【解析】考查固定句型。
句意：的确，随着鸟类和哺乳动物的体型变大，它们每单位组织的代谢率会下降，它们通常会活得更长。
It is/was+adj.+that是强调句型，It作形式主语，真正主语是that 后面的内容，B选项It is true符合题意。
因此B选项正确。
2.单选题While the company’s CEO professes to be confident and urges the deal forward, its investors are unlikely to be so _______ about its prospects. Many were uncomfortable at the way the corporation was forced to spend much of its capital in last year’s expansion, and this new venture is potentially even more risky.问题1选项A.apatheticB.sanguineC.apprehensiveD.anxious【答案】B【解析】考查形容词辨析。
A选项apathetic“无动于衷的；缺乏兴趣的”；B选项sanguine“乐观的，充满希望的”；C选项apprehensive“忧虑的”；D选项anxious“担忧的；急切的”。
氧化铁与碳酸钾对煤温和气化的影响
第16卷第2期 化学反应工程与工艺 Vo l16,N o2 2000年6月 Chemica l R ea ct ion Engineer ing and T echnolog y June, 2000文章编号:1001-7631(2000)02-0203-06研究简报氧化铁与碳酸钾对煤温和气化的影响朱廷钰1,王 洋2(1.中国科学院工程热物理研究所,北京100080;2.中国科学院山西煤炭化学研究所气化室,山西太原030001)摘 要: 对神木煤进行了流化床煤温和气化研究,考察了氧化铁、碳酸钾对煤温和气化产物产率、气体组成、半焦组成的影响。
试验结果表明:添加氧化铁后,煤气中H2产率显著增加,CO产率明显下降。
添加碳酸钾后,H2产率增幅较小,CO、CH4及其它气态烃产率基本不变,表明碳酸钾对烃类裂解反应无明显催化作用。
通过对所得半焦组成分析,发现添加碳酸钾所得半焦中硫、氮含量比原煤热解半焦有所增加,添加氧化铁所得半焦中硫、氮含量无明显变化。
关键词:氧化铁;碳酸钾;温和气化;流化床反应器中图分类号:TQ54 文献标识码:A1 前 言能源是经济发展的基础和关键,所以世界能源形式影响着各国政治经济动向。
二次世界大战之后石油消耗剧增。
1973年石油涨价之后,人们开始注意到,石油储量少,而煤炭储量高达1.1×1013吨,远比石油储量大。
因此,近几十年来世界有关煤炭利用的新技术和新理论层出不穷,煤科学得到很大发展。
煤在化学上和物理上是非均相的矿物或岩石,主要含有碳、氢、氧以及少量硫和氮,其它组成是成灰的无机化合物,它们以矿物质分散颗粒分布在整个煤中[1]。
煤是我国主要能源,煤炭占能源消费比重较大,但煤炭热利用率仅为30%左右。
化学工业以煤化工起家,现在虽然采用大力发展石油化工的方针,但煤化工在现在和将来相当长一段时间内仍将起着主要作用。
可是传统煤转化技术由于能耗高、污染大、效率低,已远远不能满足社会发展的需要。
homo sapiens and pan troglodytes 雅思阅读题库
homo sapiens and pan troglodytes 雅思阅读题库Homo sapiens and Pan troglodytes: A Comparative StudyIntroductionIn the field of anthropology and evolutionary biology, the comparison between Homo sapiens (humans) and Pan troglodytes (chimpanzees) has been a subject of great interest. Both species belong to the family Hominidae, commonly known as the great apes, and share a significant amount of genetic material. This article aims to explore the similarities and differences between Homo sapiens and Pan troglodytes, highlighting their evolutionary history, physical characteristics, and cognitive abilities.Evolutionary History1. Common AncestryHomo sapiens and Pan troglodytes shared a common ancestor that lived approximately 6 to 8 million years ago. This common ancestor is believed to be a hominid that resided in the African continent.2. Divergence and SpeciationOver time, evolutionary changes led to the divergence of Homo sapiens and Pan troglodytes. While humans continued to evolve with advancing cognitive abilities, the chimpanzees followed a different evolutionary path.Physical Characteristics1. Body StructureBoth Homo sapiens and Pan troglodytes possess similar anatomical features, such as an upright posture, opposable thumbs, and five-digit limbs. However, humans have a distinctively longer and more vertically aligned spine, allowing for efficient bipedal locomotion.2. Brain Size and Skull StructureHomo sapiens have a significantly larger brain size compared to Pan troglodytes. The increased brain size in humans is associated with advanced cognitive functions, language abilities, and complex social behaviors. Additionally, human skulls have a more rounded shape, while chimpanzee skulls exhibit a prominent brow ridge.3. Facial FeaturesHumans possess a relatively flat face with reduced prognathism (outward protrusion of the lower face). In contrast, chimpanzees have a prominent jaw and snout-like projection, enabling them to exert greater force during feeding and social interactions.Cognitive Abilities1. Tool Use and ManufacturingBoth Homo sapiens and Pan troglodytes exhibit advanced tool use. However, humans have demonstrated more sophisticated tool manufacturing and complex problem-solving skills, which have contributed to our ability to adapt to various environments.2. Language and CommunicationOne of the most significant distinguishing factors is the ability of Homo sapiens to develop complex languages. Our communication systems involve intricate grammar, syntax, and abstract reasoning. While chimpanzees possess a basic form of vocal communication and the ability to use sign language, their linguistic abilities remain limited in comparison.3. Social Structures and CooperationBoth species exhibit complex social structures, with hierarchical systems and cooperative behaviors. However, humans display more intricate social norms, cultural diversity, and the capacity for organized societies on a global scale.ConclusionThe comparative study of Homo sapiens and Pan troglodytes provides valuable insights into our evolutionary relationship and highlights the distinctive characteristics that set humans apart. While both species share common ancestry and certain physical traits, Homo sapiens have undergone significant evolutionary changes, leading to advanced cognitive abilities, complex language development, and higher levels of social organization. Understanding these similarities and differences enhances our understanding of human evolution and the complexities surrounding our place within the animal kingdom.。
基于Aspen_Plus的循环流化床工业气化炉模拟
2018年第37卷第5期 CHEMICAL INDUSTRY AND ENGINEERING PROGRESS·1709·化 工 进展基于Aspen Plus 的循环流化床工业气化炉模拟刘忠慧1，2，于旷世1，张海霞1，朱治平1，2（1中国科学院工程热物理研究所，北京 100190；2中国科学院大学，北京 100049）摘要：循环流化床煤气化炉在工业应用过程中，由于试验煤种及操作条件的多样性，通过试验法优化操作过程所需周期较长、成本较大。
因此以大量工程数据为边界条件，基于Gibbs 自由能最小化原理，利用Aspen Plus 对气化过程进行模拟，通过灵敏度分析，研究了单因素氧煤比、蒸汽煤比、气化压力、空气/蒸汽预热温度变化对气化指标的影响；并运用正交实验，研究了以上4种因素共同作用的结果。
研究结果表明：氧煤比增加使有效气（CO+H 2）含量、冷煤气效率先增加再减小，并在0.45～0.50kg/kg 时取得最大值；蒸汽煤比增加使煤气热值和气化温度减小，对有效气含量基本没有影响；气化压力增加使煤气热值和气化温度增加；空气/蒸汽预热温度增加使气化温度、有效气含量、冷煤气效率增加，煤气热值减小。
通过正交实验综合分析，氧煤比和空气/蒸汽预热温度对气化指标的影响较为显著，两者对气化指标的影响趋势基本一致；蒸汽煤比主要影响煤气热值，而气化压力主要影响比氧耗，对其他指标影响较小。
关键词：循环流化床；优化；Aspen Plus ；灵敏度分析；正交实验中图分类号：TQ546 文献标志码：A 文章编号：1000–6613（2018）05–1709–09 DOI ：10.16085/j.issn.1000-6613.2017-1493Simulation of industrial circulating fluidized bed gasifier by Aspen PlusLIU Zhonghui 1，2，YU Kuangshi 1，ZHANG Haixia 1，ZHU Zhiping 1，2（1Institute of Engineering Thermophysics ，Chinese Academy of Sciences ，Beijing 100190，China ；2University of ChineseAcademy of Sciences ，Beijing 100049，China ）Abstract ：In the process of industrial circulating fluidized bed gasification ，experimental research is time-consuming and cost-consuming due to the diversity of coal types and operating conditions. A circulating fluidized bed gasifier model was developed by Aspen Plus based on Gibbs free energy minimization. The boundary conditions of the simulation were set in terms of existing industry data. Different factors in gasification process were investigated ，including oxygen-coal ratio ，stream-coal ratio ，gasification pressure and air/stream preheating temperature. The orthogonal experiments were used to study the interactive effect of the four factors. The results showed that the gasification product （CO+H 2） content and cold gas efficiency increase first and then decrease with oxygen-coal ratio increasing. The optimal range of oxygen-coal ratio is 0.45—0.50kg/kg. The gas heating value and gasification temperature decrease with the increase of stream-coal ratio. However ，the gasification product content is hardly affected by stream-coal ratio. The gas heating value and gasification temperature increase with gasification pressure increasing. The gasification temperature ，gasification product content and cold gas efficiency increase with air/stream preheating temperature increasing ，while gas heating value decreases with air/stream preheating temperature increasing. The oxygen-coal工艺模拟与优化。
高中英语学术前沿单选题30题
高中英语学术前沿单选题30题1. In academic research, the data should be analyzed ______ to draw accurate conclusions.A. carefullyB. carelesslyC. quicklyD. slowly答案：A。
本题考查副词的用法。
carefully 表示“仔细地”，在学术研究中，为了得出准确的结论，数据应该被仔细分析。
carelessly 表示“粗心地”，不符合学术研究的要求。
quickly 表示“快速地”，但重点不是速度而是仔细程度。
slowly 表示“缓慢地”，也不符合学术研究追求准确的目的。
2. The scientist ______ a new theory to explain the phenomenon.A. put forwardB. put offC. put upD. put down答案：A。
put forward 意为“提出”，科学家提出新理论来解释这一现象，符合语境。
put off 表示“推迟”；put up 表示“张贴；搭建”；put down 表示“写下；镇压”，均不符合。
3. The experiment was ______ because of the lack of funds.A. cancelledB. continuedC. completedD. controlled答案：A。
cancelled 表示“取消”，由于缺乏资金实验被取消。
continued 表示“继续”；completed 表示“完成”；controlled 表示“控制”，均不符合缺乏资金的情况。
4. The results of the study ______ the previous hypothesis.A. confirmedB. contradictedC. supportedD. ignored答案：B。
锦州Unit,24年小学三年级下册第16次英语第1单元真题试卷[有答案]
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锦州Unit,24年小学三年级下册英语第1单元真题试卷[有答案]考试时间：100分钟（总分:100）B卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、听力题：A chemical reaction can release _____ as a product.2、填空题：A ______ (青蛙) can leap far distances.3、填空题：The _____ (果实) develops after flowers bloom.4、填空题：The dolphin is very _______ (聪明) and playful.5、What do you call a person who plays music?A. MusicianB. SingerC. PerformerD. All of the above答案:D6、听力题：Chemists study the properties of _____ and their interactions.7、听力题：A chemical reaction can produce a precipitate from ______.8、填空题：I want to be a __________ (作家) when I grow up.9、填空题：A _______ (海马) has a unique swimming style.10、听力题：Chemical bonds are formed through the sharing or transfer of ______.11、听力题：I have a ___ (pen/pencil) in my bag.12、听力题：The chemical symbol for carbon is ______.13、听力题：The __________ is a famous mountain range in North America.14、填空题：During my free time, I enjoy ______ (画画) or playing video games. It’s a good way to relax.15、填空题：The _______ (The Gold Rush) brought many settlers to California in the 1840s.16、听力题：The main component of air is _____.17、填空题：We have a ______ (丰富的) series of events planned.18、填空题：The nurse gives _____ (疫苗) to children.19、听力题：Light-years measure the distance that light travels in a ______.20、填空题：A _____ (种子) can grow into a new plant.21、听力题：A solar system consists of a star and all its ______.22、听力题：The Voyager spacecraft have traveled beyond the _______ of our solar system.23、填空题：My favorite way to relax is _______ (听音乐).24、What is the name of the famous wizarding school in Harry Potter?A. HogwartsB. NarniaC. OzD. Middle-Earth答案:A25、What sound does a cow make?A. MeowB. BarkC. MooD. Quack答案: C26、听力题：The fish swims in the _______ (water).27、填空题：A garden is full of __________ (生命).28、听力题：The study of rocks can reveal information about the Earth's ______.29、填空题：A _____ (兔子) can hop very fast.30、Which shape has four equal sides?a. Triangleb. Rectanglec. Squared. Circle答案:c31、填空题：I have a special place for my ____.32、填空题：My favorite superhero is _______ (名字). 他/她的能力是 _______ (能力).33、填空题：My ________ (玩具名称) is made of plastic and metal.34、What do we call the soft part of the bread?A. CrustB. CrumbC. LoafD. Slice35、听力题：The ______ is a talented musician.36、填空题：The owl sleeps during the _________. (白天)37、填空题：The _____ (turf) provides a soft lawn.38、填空题：The cheetah is built for _________. (速度)39、选择题：What is 50 - 25?A. 15B. 20C. 25D. 3040、听力题：The __________ is a region known for its societal structures.41、填空题：I like to go ________ (滑雪) during winter holidays.42、听力题：The chemical symbol for copper is _____.43、听力题：The Earth's crust is continuously undergoing ______.44、填空题：The ________ (植物选育) leads to better yields.45、What is the capital of Australia?A. SydneyB. MelbourneC. CanberraD. Brisbane46、填空题：The _______ (Spanish Flu) pandemic occurred in 1918-1919.47、What is the name of the largest land animal?A. HippoB. RhinoC. ElephantD. Giraffe答案: C48、听力题：My favorite color is ______. (blue)49、What do we call a person who writes books?A. AuthorB. ReaderC. EditorD. Publisher50、听力题：The stars are _____ (bright/dim) at night.51、听力题：A ______ can glide through the air.52、听力题：Air is a mixture of several different ______.53、填空题：A _____ (小马) can be very gentle with children.54、填空题：My ________ (玩具名称) has a funny voice.55、What is 7 + 2?A. 8B. 9C. 10D. 1156、填空题：I have a wonderful . (我有一个美好的。