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新人教版高中英语必修2Unit 4 History and Traditions-Listening＆Speaking＆Talking教案二
Listening and Speaking introduces the topic of “Take part in a youth project”. The listening text is an interview about "sharing views on historical sites". Through listening to a dialogue between Chinese and foreign students on the way to the Confucius Temple, students can understand their views on the Confucius Temple, Confucius, Confucius' descendants and Confucius' educational thoughts, so as to realize and think about the profound influence of Confucius and his thoughts on Chinese historical tradition. At the same time, the dialogue naturally integrates English idioms and mentions Shakespeare, the British playwright, so as to provide language materials and context for students to understand English idioms and related cultural allusions, as well as to compare Chinese and foreign cultures, which is helpful for students to understand and express the language such as history, tradition, culture and custom significant impact.Text analysis: listening text is a dialogue between a British student and a Chinese student when he goes to the Confucius Temple. When William, a British student, visited the Confucius Temple, he asked Xiao Kong, a Chinese student, for directions. Xiao Kong was just going to the Confucius Temple to meet with the members of the research group, so they went together and exchanged their views on the Confucius Temple, Confucius, Confucius' descendants and Confucius' educational thoughts. From the perspective of foreign tourists, this paper describes their thoughts on Confucius, the great son of Confucius, who had a profound impact on Chinese history and cultural tradition, and his education.Listening and Talking introduces a visit to a historic tourist destination. Tourism is a common way to understand a country's history, culture, and customs and so on. Students listen to the dialogue between Xiao Yan, a youth hostel Usher, and Paul, a backpacker, to learn about Pingyao's famous historical and cultural attractions and Paul's travel experience and experience as a foreign tourist.
新人教版高中英语必修2Unit 4 History and Traditions-Reading for Writing教案
Step 1 Lead inThere are many interest of places in the UK. What do you know ?The Big Ben the London Tower the Thames RiverStep 2 Before reading---analyze the titleBeautiful Ireland and its traditionWe know that the article mainly tells about the beauty and traditions of Ireland. Step 3 While reading---Task 1Read the text and answer the following questions.Q1: What makes the Irish countryside exciting and inspiring?Its beauty and how it offers something for all the scenes.Q2: What are the best ways to experience some Irish traditions and cultures?By stopping by a village pub and relaxing with a drink and traditional meal while listening to music and watching dancingQ3: What is the meaning of “breathe in the sweet scent of fresh flowers while birds greet the new day with their morning song ?”It means to not just smell but also breathe in the smell of fresh flowers early in the morning as the birds sing their first song of the new day.Q4: What are the best ways to experience Chinese traditions and customs ?By travelling to different places and using all your senses to experience everything and by interacting with local people.Step 4 While reading---Task 2Analyze the descriptive paragraph1. Identify and underline the paragraph’s introductory sentence and the ending sentence.Introductory sentence: Ireland’s beautiful countryside has always had a great influence on its people and traditions.Ending sentence: And if you introduce yourself to a friendly face, you are more than likely to experience local culture and customs first-hand.2. The paragraph talks about different senses in different places. Write the senses and places in the order that they appear.
新人教版高中英语必修2Unit 4 History and traditions教案
这个地区有着深厚的传统。既学既练：为了让更多的外国游客了解中国文化，欣赏中国美丽的自然风光，感受中国发生的巨大变化，某外文杂志社将出版一本英语小册子来介绍中国的旅游景点。该杂志社邀请你为该小册子写一篇英语短文来介绍杭州，内容包括：1．杭州的位置(中国东南部)、面积(16 000多平方公里)及历史(2 200多年)等；2．杭州的旅游特色(自然风景、传统文化、特色小吃等)；3．希望更多的游客来杭州参观。注意：1．词数80左右；2．可适当增加细节，以使行文连贯。Located in the southeast of China, Hangzhou is a beautiful city．Dating back more than 2，200 years, Hangzhou covers an area of more than 16，000 square kilometers．In Hangzhou, you can visit the West Lake, whose scenery is fascinating．In addition, you can’t miss its cultural relics and historical sites, from which you will learn more about excellent Chinese traditional culture and traditions．In Hangzhou, the special snacks are famous and visitors from different parts of the world think highly of them．As a tourist attraction, Hangzhou attracts a large number of visitors from home and abroad every year．Once you come to China, Hangzhou is a scenic spot you can’t miss．
人教版高中历史必修2罗斯福新政教案
【教学参考】对“新政”作用的评价史学界对“新政”作用的评价是仁者见仁、智者见智，但基本上有三种观点，即“功大于过论”、“过大于功论”和“功过参半论”。持“功大于过论”者认为“新政”在美国历史上基本上是一种进步现象，首先，“新政”挽救了危机，使美国人民摆脱了危机的困苦局面；其次，在缺少足够的宏观经济政策知识的时代，罗斯福所做的努力确实是开创性的；再次，罗斯福“新政”开启了美国以后历届政府实施国家干预政策的大门，成为缓解自由主义经济制度之弊病的一剂良方，并在实质上加强了美国联邦政府的权威；最后，在30年代资本主义世界经济危机的背景下，同日本、德国为转嫁危机而发动战争的策略相比，“新政”无疑代表了一种进步、民主的解救危机方式。持“过大于功论”者认为“新政”未能使美国走出萧条、步入繁荣。
在全区疫情防控整治层层加码问题推进会上的讲话范文
一要全面贯彻落实各级防控要求。为进一步提高疫情防控措施的科学性、精准性、针对性，近期，国家对疫情防控工作进行了调整。一是修订了《新型冠状病毒肺炎防控方案（第九版）》。主要是对隔离管控措施、风险地区划分、核酸检测频次等方面措施进行了重新规定。其中，人员隔离方面上有了较大变化：密接、入境人员隔离时间由“14+7”调整为“7+3”；次密接由“7天集中隔离”调整为“7天居家隔离”；风险区域防控标准统一使用中高风险区概念，近7天到过高风险区的，实行7天集中隔离，近7天到过中风险区的，实行7天居家医学观察，近7天内到过低风险区的，实行3天2次核酸检测。二是提出了“九不准”要求。不准随意将限制出行的范围由中、高风险地区扩大到其他地区，不准对来自低风险地区人员采取强制劝返、隔离等限制措施，不准随意延长中、高风险地区及封控区、管控区的管控时间，不准随意扩大采取隔离、管控措施的风险人员范围，不准随意延长风险人员的隔离和健康监测时间，不准随意以疫情防控为由拒绝为急危重症和需要规律性诊疗等患者提供医疗服务，不准对符合条件离校返乡的高校学生采取隔离等措施，不准随意设置防疫检查点，限制符合条件的客、货车司乘人员通行，不准随意关闭低风险地区保障正常生产生活的场所。近日，国家和省、市相继召开疫情防控电视电话会议，对落实《新型冠状病毒肺炎防控方案（第九版）》和“九不准”要求进行了安排部署。
人教版高中语文必修3《马嵬（其二）》教案2篇
结合历史自古以来，江山美人历来都是引无数英雄豪杰竞折腰的，如果说英雄选择了美人却丢了江山，把所有罪名都归结于“女人是祸水”。但是，纣王无道，和有了妲己有必然的联系吗？有人说妲己坏透了，坏透了的妲己如果不是取得纣王的信任是坏不起来的，纣王听信了妲己的谗言，听与不听决定权在纣王，而不在妲己。强势永远在纣王一边。再来看看西施和杨贵妃：西施是作为越国贡献给吴国的供品来到吴王夫差的身边的，杨贵妃更是先是李隆基的儿媳妇被看中而得宠的。所以，西施和杨贵妃这两个可怜的女人根本没有自己的独立选择，没有独立的爱情，如果没有西施，就会有南施，或北施；如果没有杨贵妃，就会有李贵妃，王贵妃，总之什么施，什么妃是不能少的，因为那是吴王和李隆基的需要。
人教版高中语文必修5《归去来兮辞（并序）》教案
【教学目标】1.理解作者反抗黑暗，辞官归田，不与当时黑暗的上层社会同流合污而热爱田园生活的积极精神，学习其高洁的理想志趣和坚定的人生追求。2.掌握“胡、奚、曷、焉、何”五个疑问代词，归纳“行、引、乘、策”等四个词的一词多义，了解“以、而、之、兮、来”等文言虚词的用法。3.背诵全文。【教学重点】1.了解作者辞官归田的原因，深刻体味诗人鄙弃官场，热爱田园的无限欣喜之情。2.背诵全文。【教学难点】1.理解记述中渗透出的或喜或哀，或决绝或犹疑的复杂感情。2.归纳实词、虚词的用法，掌握省略句、倒装句两种句式。【教具准备】投影仪投影胶片【课时安排】2课时【教学过程】第一课时[教学要点]了解陶渊明及其作品。读课文，利用注释、工具书，初步把握文章，朗读课文，找出押韵的字，由押韵归纳各层大意，帮助学生理清背诵思路，背诵全文。[教学步骤]一、导语《桃花源记》是我们在初中接触过的陶渊明的作品。师生一同背诵。《桃花源记》中悠闲自得的田园生活正是作者精神追求的形象反映。今天我们学习的《归去来兮辞》正是作者决别官场，同上层社会分道扬镳的宣言书。
人教版高中语文必修3《劝学》教案2篇
五．研习第一段：1．诵读指导要处理好句中停顿2．请学生对照注释翻译本段重点词句：学不可以已已：停止。青，取之于蓝而青于蓝于：从；比。木直中绳中：zhàng符合，合于。虽有槁暴，不复挺者，揉使之然也有通又，揉通煣，以火烘木，使其弯曲。然：这样。翻译：故木受绳则直，金就砺则利，君子博学而日参省乎己，则知明而行无过矣。所以木材经墨线画过（再用斧锯加工）就直了，金属刀剑拿到磨刀石上（磨过）就锋利了，君子广博地学习并且每天对自己检验反省，就能智慧明达，行为没有过错了。3．本段是从哪个角度论述中心论点的？明确：本段是从学习的意义这个角度论述中心论点的。荀子认为人的知识、道德、才能都不是天生成的，而是后天不断学习获得的，学习的意义十分重大，所以学习不能停止。4．本段中几个比喻句是为了说明什么道理？学生讨论发言，教师明确：
人教版高中历史必修3宋明理学教案2篇
二、程朱理学：1、宋代“理学”的产生：（1）含义：所谓“理学”，就是用“理学”一词来指明当时两宋时期所呈现出来的儒学。广义的理学，泛指以讨论天道问题为中心的整个哲学思潮，包括各种不同的学派；狭义的理学，专指程颢、程颐、朱熹为代表的，以“理”为最高范畴的学说，称为“程朱理学”。理学是北宋政治、社会、经济发展的理论表现，是中国古代哲学长期发展的结果，是批判佛、道学说的产物。他们把“理”或“天理”视作哲学的最高范畴，认为理无所不在，不生不灭，不仅是世界的本原，也是社会生活的最高准则。在穷理方法上，程颢“主静”，强调“正心诚意”；程颐“主敬”，强调“格物致知”。在人性论上，二程主张“去人欲，存天理”，并深入阐释这一观点使之更加系统化。二程学说的出现，标志着宋代“理学”思想体系的正式形成。【合作探究】宋代“理学”兴起的社会条件：
新人教版高中英语必修3Unit 1 Festivals and Celebrations教学设计二
1. Ss look at the picture and scan the passage to understand the main idea while teacher is giving the following questions to inspire Ss to think.*Where are those people?*What are they doing?*Why are they so excited?2. Ss complete the passage with the appropriate -ing form. Then discuss and check the answers with class.Answers: boring, interesting, taking, exciting, amazing3. The teacher raises questions for the students to discuss and encourages them to express their opinions.*Do you like La Tomatina? Why or why not?4. Each group representative reports the discussion result, the teacher gives feedback and the evaluation.Step 6 PracticeActivity 41. Ss complete the Ex 2 in Using structures.2. Check the answers after finishing the exercises.①The dragon boat races are the most exciting part of the Dragon Boat Festival.② The children were excited to go Easter egg hunting.③What an amazing performance! This is the best music festival I have ever been to.④We were amazed by her funny-looking hat.⑤His inspiring speech at the conference won the admiration/ favour of the audience.⑥This is a challenging game to test your memory and observation capabilities. 3. T asks Ss to finish Ex 3 and 4 in Using structures by themselves, then check the answers with class.Step 6 Homework1. Understand and master the functions and usage of the -ing form;2. Finish the other exercises in Using structures.1、通过本节内容学习，学生是否理解和掌握动词-ing形式作定语和表语的功能和意义；2、通过本节内容学习，学生能否在理解文段内容的基础上，根据上下文语境和表达逻辑，能正确运用动词-ing形式描述节日庆典。3、通过本节内容学习，学生是否归纳和积累用于表达情绪的相关词汇。
新人教版高中英语必修3Unit 2 Morals and Virtues教学设计二
Activity 41. Students complete the task of activity 4, then teachers and students check the answers. 2. The teacher organized the students to work together and asked them to use the tables and mind maps sorted out before to retold the important choices in Lin Qiaozhi's life and their resultsStep 5 Language points1. The teacher asks the students to read the text carefully, find out the core words and long and difficult sentences in the text and draw lines, understand the use of vocabulary, and analyze the structure of long and difficult sentences. 2. The teacher explains and summarizes the usage of core vocabulary and asks the students to take notes. 3. The teacher analyzes and explains the long and difficult sentences that the students don't understand, so that the students can understand them better. Step 6 Homework1. Read the text again, in-depth understanding of the text; 2. Master the use of core vocabulary and understand the long and difficult sentences. 3. Complete relevant exercises in the guide plan. 1、通过本节内容学习，学生是否理解和掌握阅读文本中的新词汇的意义与用法；2、通过本节内容学习，学生能否结合文本特点总结林巧稚的人生原则和人格品质特征；3、通过本节内容学习，学生能否针对人生抉择发表自己的看法；能否全面地、客观地、理性地看待问题，进而对道德和人性有更加深入的思考和理解。
新人教版高中英语必修3Unit 1 Festivals and Celebrations教学设计三
*wide range of origins(= a great number of different origins, many kinds of origins)*It featured a parade and a great feast with music, dancing, and sports. (=A parade and a great feast with music, dancing, and sports were included as important parts of the Egyptian harvest festival.)*.. some traditions may fade away and others may be established.(= Some traditions may disappear gradually, while other new traditions may come into being.）Step 6 Practice(1) Listen and follow the tape.The teacher may remind the students to pay attention to the meaning and usage of the black words in the context, so as to prepare for the completion of the blanks in activity 5 and vocabulary exercises in the exercise book.(2) Students complete the text of activity 5 by themselves.The teacher needs to remind the students to fill in the blanks with the correct form of the vocabulary they have learned in the text.Students exchange their answers with their partners, and then teachers and students check their answers.(3)Finish the Ex in Activity 5 of students’ book.Step 7 Homework1. Read the text again, in-depth understanding of the text;2. Discuss the origin of festivals, the historical changes of related customs, the influence of commercial society on festivals and the connotation and essential meaning of festivals.3. Complete relevant exercises in the guide plan.1、通过本节内容学习，学生是否理解和掌握阅读文本中的新词汇的意义与用法；2、通过本节内容学习，学生能否结合文本特点快速而准确地找到主题句；3、通过本节内容学习，学生能否理清论说文的语篇结构和文本逻辑，了解节日风俗发展与变迁，感悟节日的内涵与意义。
新人教版高中英语必修3Unit 2 Morals and Virtues教学设计三
The joke set her crying.这个玩笑使她哭起来。Step 5 ReadingActivity 31. Students read the small text in activity 3. The teacher provides several small questions to check whether students understand the content of the text and the ideographic function of the -ing form in the text.*Where are those people?*Why did Dr Bethune come to China?*How did he help the Chinese people during the war?*What did Chairman Mao Zedong say about him?2. Ss try to rewrite some sentences using the -ing form. Then check the answers. When checking the answers, the teacher can ask different students to read the rewritten sentences and give comments.Answers:1. he became very interested in medicine, deciding to become a doctor.2. …after hearing that many people were dying in the war.3. Helping to organise hospitals, he taught doctors and nurses, and showed people how to give first aid./ He helped to organise hospitals, teaching doctors and nurses, and showing people how to give first aid.4. …praising Dr Bethune as a hero to be remembered in China.Step 6 PracticeActivity 4Students complete grammar activities 2 and 3 on page 69 of the workbook.Step 6 Homework1. Understand and master the functions and usage of the -ing form;2. Finish the other exercises in Using structures.1、通过本节内容学习，学生是否理解和掌握动词-ing形式作宾语补足语语和状语语的功能和意义；2、通过本节内容学习，学生能否正确使用动词-ing形式描述人物的行为、动作及其经历；3、通过本节内容学习，学生能否独立完成练习册和导学案中的相关练习。
新人教版高中英语必修3Unit 2 Morals and Virtues教学设计四
3.Teachers ask different groups to report the answers to the questions and ask them to try different sentence patterns.The teacher added some sentence patterns for students to refer to when writing.Step 4 Writing taskActivity 51.Write the first draft.Students first review the evaluation criteria in activity 5, and then independently complete the draft according to the outline of activity 4, the answers to the questions listed in the group discussion and report, and the reference sentence pattern.2.Change partners.The teacher guides the students to evaluate their partner's composition according to the checklist of activity 5 and proposes Suggestions for modification.3.Finalize the draft.Based on the peer evaluation, students revise their own compositions and determine the final draft.Finally, through group recommendation, the teacher selects excellent compositions for projection display or reading aloud in class, and gives comments and Suggestions.Step 5 Showing writingActivity 5T call some Ss to share their writing.Step 6 Homework1. Read the passage in this section to better understand the passage.2. Carefully understand the hierarchical structure of the article, and deeply understand the plot of the story according to the causes, process and results;3. Independently complete the relevant exercises in the guide plan.1、通过本节内容学习，学生是否理解和掌握阅读文本中的新词汇的意义与用法；2、通过本节内容学习，学生能否通过人物言行的对比分析道德故事的深层内涵；3、通过本节内容学习，学生能否根据故事的起因、经过和结果来深入理解故事的情节，从而了解文章的层次结构；4、结合现实生活案例发表自己的见解和看法,写一篇观点明确、层次分明的故事评论。
新人教版高中英语必修3Unit 3 Diverse Cultures教学设计三
The price is the same as(the price was)before the war.价格与战前相同。(4)定语从句中的“关系代词＋助动词be”可以省略。The ticket(that/which was)booked by his sister has been sent to him.他妹妹订的那张票已送到了他那里。Step 5 PracticeActivity 3(1) Guide students to complete the four activities in the Using Structures part of exercise book, in which activities 1 and 2 focus on ellipsis in dialogue answers, activity 3 focus on signs and headlines, two typical situations where ellipsis is used, and activity 4 focus on ellipsis in diary, an informal style.(2) Combine the examples in the above activities, ask students to summarize the omitted situations in groups, and make their own summary into a poster, and post it on the class wall after class to share with the class.(This step should give full play to the subjectivity of students, and teachers should encourage students to conclude different ellipsis phenomena according to their own understanding, they can conclude according to the different parts omitted in the sentence.)Step 6 Homework1. Understand and master the usages of ellipsis;2. Finish the other exercises in Using structures of Workbook.1、通过本节内容学习，学生是否理解和掌握省略的用法；2、通过本节内容学习，学生能否根据上下文语境或情景恢复句子中省略的成分，体会使用省略的效果；3、通过本节内容学习，学生能否独立完成练习册和导学案中的相关练习。
新人教版高中英语必修3Unit 3 Diverse Cultures教学设计二
(2)Consolidate key vocabulary.Ask the students to complete the exercises of activity 6 by themselves. Then ask them to check the answers with their partners.(The first language:Damage of the 1906 San Francisco earthquake and fire.A second language: Yunnan - one of the most diverse provinces in China).Step 5 Language points1. The teacher asks the students to read the text carefully, find out the more words and long and difficult sentences in the text and draw lines, understand the use of vocabulary, and analyze the structure of long and difficult sentences.2. The teacher explains and summarizes the usage of core vocabulary and asks the students to take notes.3. The teacher analyzes and explains the long and difficult sentences that the students don't understand, so that the students can understand them better.Step 6 Homework1. Read the text again, in-depth understanding of the text;2. Master the use of core vocabulary and understand the long and difficult sentences.3. Complete relevant exercises in the guide plan.1、通过本节内容学习，学生是否理解和掌握阅读文本中的新词汇的意义与用法；2、通过本节内容学习，学生能否结合文本特点了解文章的结构和作者的写作逻辑；3、通过本节内容学习，学生能否了解旧金山的城市风貌、文化特色，以及加利福尼亚州的历史，体会多元文化对美国的影响。
新人教版高中英语必修3Unit 3 Diverse Cultures教学设计四
该板块的活动主题是“介绍一个有显著文化特征的地方”( Describe a place with distinctive cultural identity)。该板块通过介绍中国城继续聚焦中国文化。本单元主题图呈现的是旧金山中国城的典型景象, Reading and Thinking部分也提到中国城,为该板块作铺垫。介绍中国城的目的主要是体现中国文化与美国多元文化的关系,它是美国多元文化的重要组成部分。中国城也是海外华人的精神家园和传播中国文化的重要窗口,外国人在中国城能近距离体验中国文化。1. Read the text to understand the cultural characteristics of Chinatown in San Francisco and the relationship between Chinese culture and American multiculturalism;2. Through reading, learn to comb the main information of the article, understand the author's writing purpose and writing characteristics;3. Learn to give a comprehensive, accurate, and organized description of the city or town you live in;Learn to revise and evaluate your writing.Importance:1. Guide the students to read the introduction of Chinatown in San Francisco and grasp its writing characteristics;2. Guide students to introduce their city or town in a comprehensive, accurate and organized way;3. Learn to comb the main information of the article, understand the author's writing purpose, and master the core vocabulary.
人教版新课标高中物理必修1弹力教案2篇
一般情况下，凡是支持物对物体的支持力，都是支持物因发生形变而对物体产生弹力。所以支持力的方向总是垂直于支持面而指向被支持的物体。例1：放在水平桌面上的书书由于重力的作用而压迫桌面，使书和桌面同时发生微小形变，要恢复原状，对桌面产生垂直于桌面向下的弹力f1，这就是书对桌面的压力；桌面由于发生微小的形变，对书产生垂直于书面向上的弹力f2，这就是桌面对书的支持力。学生分析：静止地放在倾斜木板上的书，书对木板的压力和木板对书的支持力。并画出力的示意图。结论：压力、支持力都是弹力。压力的方向总是垂直于支持面而指向被压的物体，支持力的方向总是垂直于支持面而指向被支持的物体。引导学生分析静止时，悬绳对重物的拉力及方向。引导得出：悬挂物由于重力的作用而拉紧悬绳，使重物、悬绳同时发生微小的形变。重物由于发生微小的形变，对悬绳产生竖直向下的弹力f1，这是物对绳的拉力；悬绳由于发生微小形变，对物产生竖直向上的弹力f2，这就是绳对物体的拉力。
人教版新课标高中物理必修1摩擦力教案2篇
l．知识与技能：（1）知道摩擦力产生的条件。（2）能在简单问题中，根据物体的运动状态，判断静摩擦力的有无、大小和方向；知道存在着最大静摩擦力。（3）掌握动磨擦因数，会在具体问题中计算滑动磨擦力，掌握判定摩擦力方向的方法。（4）知道影响到摩擦因数的因素。2．过程与方法：通过观察演示实验，概括出摩擦力产生的条件及摩擦力的特点，培养学生的观察、概括能力。通过静摩擦力与滑动摩擦力的区别对比，培养学生分析综合能力。3．情感态度价值观：在分析物体所受摩擦力时，突出主要矛盾，忽略次要因素及无关因素，总结出摩擦力产生的条件和规律。二、重点、难点分析1．本节课的内容分滑动摩擦力和静摩擦力两部分。重点是摩擦力产生的条件、特性和规律，通过演示实验得出关系f=μN。2．难点是学生有初中的知识，往往误认为压力N的大小总是跟滑动物体所受的重力相等，因此必须指出只有当两物体的接触面垂直，物体在水平拉力作用下，沿水平面滑动时，压力N的大小才跟物体所受的重力相等。
人教版新课标高中物理必修2功率教案2篇
1．用CAI课件模拟汽车的启动过程。师生共同讨论：①如果作用在物体上的力为恒力，且物体以匀速运动，则力对物体做功的功率保持不变。此情况下，任意一段时间内的平均功率与任一瞬时的瞬时功率都是相同的。②很多动力机器通常有一个额定功率，且通常使其在额定功率状态工作（如汽车），根据P=FV可知：当路面阻力较小时，牵引力也小，速度大，即汽车可以跑得快些；当路面阻力较大，或爬坡时，需要比较大的牵引力，速度必须小。这就是爬坡时汽车换低速挡的道理。③如果动力机器在实际功率小于额定功率的条件下工作，例如汽车刚刚起动后的一段时间内，速度逐渐增大过程中，牵引力仍可增大，即F和v可以同时增大，但是这一情况应以二者乘积等于额定功率为限度，即当实际功率大于额定功率以后，这种情况不可能实现。