1-5-1 课后练案

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人教版五年级上册数学教案-第1单元第5课时练习课

人教版五年级上册数学教案-第1单元第5课时练习课一、教学目标1. 知识与技能：（1）使学生进一步理解和掌握三位数乘两位数的计算法则，并能正确熟练地进行计算。

（2）使学生能够运用乘法解决一些简单的实际问题。

2. 过程与方法：（1）通过练习，提高学生的计算能力，培养数感。

（2）通过解决实际问题，培养学生的应用意识和解决实际问题的能力。

3. 情感态度与价值观：（1）培养学生认真、细心的学习态度。

（2）培养学生合作交流的意识，感受数学与生活的紧密联系。

二、教学重点与难点1. 教学重点：使学生进一步理解和掌握三位数乘两位数的计算法则，并能正确熟练地进行计算。

2. 教学难点：培养学生解决实际问题的能力。

三、教学过程1. 导入（5分钟）老师出示一些三位数乘两位数的题目，让学生进行计算，然后请几位同学上黑板演示计算过程，其他同学在座位上计算。

通过这个环节，让学生回顾上节课学习的三位数乘两位数的计算法则。

2. 基本练习（15分钟）老师出示一些三位数乘两位数的题目，让学生进行计算。

在计算过程中，老师巡视指导，及时发现问题并进行纠正。

通过这个环节，让学生进一步理解和掌握三位数乘两位数的计算法则。

3. 提高练习（10分钟）老师出示一些较难的三位数乘两位数的题目，让学生进行计算。

在计算过程中，鼓励学生相互讨论，共同解决问题。

通过这个环节，提高学生的计算能力，培养数感。

4. 解决实际问题（10分钟）老师出示一些与生活相关的实际问题，让学生运用乘法进行解决。

在解决过程中，引导学生分析问题，找出数量关系，列式计算。

通过这个环节，培养学生的应用意识和解决实际问题的能力。

5. 总结与反思（5分钟）老师引导学生回顾本节课的学习内容，总结三位数乘两位数的计算法则和解决实际问题的方法。

同时，让学生反思自己在计算过程中出现的问题，以及如何避免这些问题的发生。

四、作业布置1. 完成本节课的练习题。

2. 预习下节课的内容。

五、板书设计1. 三位数乘两位数的计算法则。

行政组织学课后思考练习1-5章

行政组织学课后思考与练习第一章一、单项选择1.以明文规定的形式确立下来，成员具有正式分工关系的组织是（正式组织）；2.组织内若干成员由于相互接触、感情交流、情趣相近、利害一致，未经认为的设计而产生交互行为和意识，并由此自然形成一种人际关系，此种组织为（非正式组织）；3.以镇压、暴力等控制手段作为控制和管理下属的主要方式，此种类型的组织为（强制性组织）；4.以组织的参与者或成员为主要的受惠对象，组织的目的在于维护及促进组织成员所追求的利益，此种类型的组织为（互利性组织）；5.行政组织是追求（公共利益的组织）；二、多单项选择题（注：括号里面的内容即为选项内容）1、学者从不同的角度和方法去透视组织，给予不同的定义，目前学界对组织界定的取向，主要有以下几种：（静态的组织观，动态的组织观，生态的组织观，精神的组织观）。

2、管理学家W。

理查德。

斯格特在其《组织理论》一书中，认为组织的基本构成要素为（社会结构、参与者、目标、技术、环境）3、按组织内部是否有正式的分工关系，人们把组织分为（正式组织、非正式组织）。

4、美国学者艾桑尼以组织中人员对上级的服从程度、上级对下级权力的运用关系，将组织划分为（强制性组织、功利性组织、规范性组织）。

5、美国著名社会学家、交换学派的代表布劳及史考特，根据组织目标和受益者的关系，把组织分为（互利组织、服务组织、企业组织、公益组织）。

6、从系统理论的角度看，任何一种社会组织大体都发挥三种功能：（“聚合”功能、“转换”功能、“释放”功能）。

7、组织是一个纵横交错的权责体系，构成组织权责体系的三大要素为（职务、职权、职责）。

8、世界银行在其1997年的《世界发展报告》中指出，以下几项基础性的任务处于每个政府使命的核心地位，这些使命是（建立法律基础、保持非扭曲的政策环境、投资于基本的社会服务与基础设施）。

三、名词解释1、组织：组织是在特定的社会环境之中，由一定的要素构成，为达到一定目标而建立起来的，并随着内外环境的不断变化而自求适应和调整，具有特定文化特征的一个开放系统。

高级英语第一课至第五课课后练习

第一课至第五课Sprinkle swelter in other words lazy rather than reject act out idle worship reverence drive embody1.His paintings _______ the spirit of the modern era.2.How do you _______ your frustrations, by throwing glasses or something?3.The peddler ________ some water over his vegetables to make them fresher and heavier.4.In such hated air, the ______ students could hardly keep their minds on their lessons.5.That is ________ gossip. Don’t listen to it.6.She sent her application for the job, but was _______ as unqualified.7.The salesman considered it safe to go along with the boss ________ to contradict him.8.Everybody should have a sincere _________ for the laws of his country.Strike run out of cleanse disappoint insoluble unprecedent satisfy virtual contribute available symbolize vehement1.For many American, it is their lifelong dream to buy a _______ two-storied house with agarden.2.To make Beijing our worthy capital, we must get it _______ of polluted air, among otherthings.3.In a lot of cultures, red roses are used to ______ love.4.Unfortunately, their car _______ fuel, just ten miles short of Chicago.5.An _________ event in history took place in 1969, when two American astronauts landed forthe first time on the Moon.6.The detective finally gave up, declaring the mystery _______.7.Though high-sounding, his speech ______ everybody at the meeting as totally irrelevant towhat was discussed.8.If you travel by plane, Beijing and Guangzhou are _______ neighboring cities.Apologetic motion apprehension distrustful profusion admonish terrifying coax contemptible ensue desist overpower1.They heard of the traffic accident and immediately rushed to the hospital, full of ______ aboutthe safety of the passengers.2.The ______ explosion occurred early in the morning.3.As he entered the newly decorated building, an ______ smell of paint made him quite him.4.The old man yelled over and over again Stop thief, stop thief! But no body did anything. Theindifference of the onlookers was really ________.5.The police _______ for the crowd to move on to the next street.6.In Kunming, flowers grow in great ________ all the year round.7.The fans shouted and clapped so loudly that in the ____ confusion nobody could hear a thing.8.The boys were frightened, but the police managed to _______ them into telling him what theyhad seen that night.Dodge drown intrude legalize oath withhold precedent rumble taboo credible arguable usher1.She skillfully ______ the questions about her private life.2.It was very rude of him to________ on my privacy.3.The schools decided to _______ payment until they had completed the construction of thebuilding.4.Reform and Open-door policy has ______ in a new era of economic development.5.They started a campaign to ______ abortion.6.If you let the boy go without punishment, he will use it as a ______ for doing wrong again.7.After the exposure of his lies the Congressman is no longer a ______ politician.8.It is ______ that primary school students should pay any tuition.Rather than register think of aware of predominant instead of lie behind prejudice menial separate make the difference phenomenon1.Don’t overlook the job of a secretary. It ______ between failure and success for the company.2.The newly-launched satellite is expected to obtain data on solar radiation, sky brightness andother important _______.3.How can you be content to do such _______ tasks as washing dishes here in the States?4.A______ is a judgement formed before examination the evidence.5.We all listen to music according to our _____ capacities.6.Knowledge will always _______ over ignorance.7.When this corporation entered the Chinese market 8 years ago, it aimed to occupy a largermarket share______ to make profit in the short run.8.Of all the animals, the ape is _______ as the most forgiving animal.1.The whole nation watched the two candidates (arguing, debating) the issue of raising taxes on TV.2. It was a (proud, arrogant) moment for my cousin when she shook hands with the President.3. Even if you (mix, blend) oil and water, they will not (mix, blend).4. Some people watch television so much that they cannot (conceive, imagine) of living without it.5. As it was an informal dinner, most people (wore, were dressed) in their comfortable clothes.6. Do you think those young people are (idealistic, ideal) or pragmatic?7. Filled with great (adulation, admiration) for their integrity and courage, he was determined to be like them.8. Deep at night, they could still hear gun-fire (rambling, rumbling) in the distance.1.The professor looked over our papers with a hasty (sight, glance).2.Before ordering their dinner, they considered the (relevant, relative) merits of chicken androast beef.3.The little boys constant noise (exhilarated, exasperated) his father, who was busy writing apaper for a symposium.4.Isnt it ( wholesome, noisome) to live in a city with so many vehicles passing day and night?5.He was born in a small town (lives, inhabited) by about 500 people.6.Her desk was all (jumped, cluttered) with old papers, strings, and other odds and ends7.He thinks they are extremely (idealistic, ideal), for all their pragmatism.8.She made one last (attraction, appeal) to her father for permission to go to the party.1. The girl looked at the doctor (terrifyingly, terrified).2. If you finish all the homework tonight, we will go for a picnic tomorrow, he (admonished, coaxed)3. He thought their behavior was (contemptuous, contemptible), but he did not say anything in front of the host.4. Summoned by the boss, he approached his office full of (apprehension, distrust).5. He was sincerely sorry for what happened at the party, so people accepted his (excuse, apology).6. They were walking in the forest when they heard a (terrifying, terrific) roar which made their blood freeze.7. Obviously they were getting nowhere with the meeting, so he decided to (desist, resist) from making a final decision that afternoon.8. How can you say that you do not want to see your grandmother? The father (admonished, coaxed)1.The warrior managed to （evade，dodge）the arrow that came flying through the air.2.The speakers last few words were (drowned out, stopped) by the audinces thunderousapplause.3.Would I be (intruding, invading) if I joined in your discussion?4.The (omission, exclusion) of a full stop at the end of the sentence is a deliberate act by thewriter.5.The newly-recruited soldiers swore an (oath, promise) of loyalty to their country.6.The suspect was accused of (preventing, withholding) some important evidence from thecourt.7.Whether or not he is the best person for the promotion is (debatable, arguable).8.He has established himself as a (credible, believable) businessman.1.His story of having discovered the treasure buried by some pirates seemed (incredible,incredulous) to everyone.2.But the piano is out of (tone, tune), she said in a disappointed (tone, tune).3.Her friends expressed great (sympathy, empathy) to her when her mother died.4.They are now enjoying a short (vocation, vacation) at the seashore.5. A (content, contented) person is one who is happy with what he has.6.All the streets will be (eliminated, illuminated) tomorrow evening for the celebration.7.Her (perseverance, persistence) in wearing that old-fashioned that surprised her husband.8.The effect of the officers speech was such that the army recovered its (moral, morale) at once.。

人教版一年数学上册第三单元《1-5的认识：练习课》教案

人教版一年级数学上册第三单元《1-5的认识：练习课》教案一、教学目标1.能正确快速地读出1-5的数字。

2.能准确地排序1-5的数字。

3.能够简单地完成1-5的加法运算。

4.能正确地运用1-5的数字进行简单问题的解答。

二、教学重点1.1-5的数字的认识和排序。

2.1-5的加法运算。

三、教学难点1.在问题解答中灵活应用1-5的数字。

四、教学准备1.教学课件。

2.1-5的数字卡片。

3.班级练习册。

五、教学过程1. Warm-up（热身，时间：5分钟）•利用数字卡片让学生快速读出1-5的数字，逐渐提高速度。

2. Presentation（呈现，时间：10分钟）•通过课件展示1-5的数字，让学生熟悉数字的形状。

•让学生依次排好1-5的数字顺序，巩固数字的认识。

3. Practice（练习，时间：15分钟）•开展1-5的加法运算练习，让学生在课堂上尝试简单的加法算术题。

4. Application（应用，时间：10分钟）•设计一些简单的问题让学生灵活运用1-5的数字进行解答，培养学生的逻辑思维能力。

5. Consolidation（巩固，时间：5分钟）•让学生自行完成课后练习册中与本节课内容相关的练习，巩固学习成果。

六、教学反思本节课主要围绕1-5的数字的认识和运用展开，通过多种形式的练习和应用让学生掌握1-5的基本概念。

在今后的教学中需要继续加强学生对数字认识的训练，提高他们在数字运算和问题解答方面的能力。

以上是本节课的教学大纲，希望对您的备课有所帮助。

电气安装与维修参考答案

A1-1课后巩固练习答案1.照明控制箱定位和方位正确，误差不得大 B mm。

A．2 B．5 C．10 D．202.电源配电箱固定螺丝不少于 C 颗。

A.1B.2C.3D.43.20mm×10mm、39mm×19mm线槽固定点最大间距应小于 B m。

A.0.2B.0.5C.1D.24.60mm×40mm线槽固定点最大间距应小于 C m。

A.0.2B.0.5C.1D.25.线槽的固定，20-40槽用 D 螺丝固定，60槽用螺丝固定。

A．双排单排 B. 双排双排 C．单排单排 D．单排双排6.塑料线槽的选择原则？答：选择塑料线槽时，如果施工图纸有明确表示，则按施工图纸要求选择即可，否则需按照线槽容纳导线的根数和横截面积来确定线槽的规格和型号。

A1-2课后巩固练习答案1.60mm×40mm线槽位置尺寸与标示尺寸误差 A mm。

A．±5 B．±10 C．±15 D.±202.60mm×40mm与60mm×40mm线槽连接接口处缝隙小于 A mm。

A. 1B. 2C. 3D. 43.60mm×40mm线槽与照明配电箱边的接缝应小于 _C_mm。

A.0.2B. 0.5C. 1D. 24.40mm×20mm与40mm×20mm线槽连接接口处缝隙小于 A mm。

A. 1B. 2C. 3D. 45.40mm×20mm与60mm×40mm线槽接缝小于__C__mm。

A.0.2B. 0.5C. 1D. 2A1-3课后巩固练习答案1.20mm×10mm、39mm×19mm线槽固定点最大间距应小于 B m。

A.0.2B.0.5C.1D.22.传感器模块模块使用___D__颗螺丝固定。

A.1B.2C.3D.43.60mm×40mm线槽均采用双排螺丝固定或单排螺丝交替固定，且每段线槽固定螺丝不少于__D__颗.A.1B.2C.3D.44.线槽两端都有固定螺丝，且固定螺丝离槽端的距离__D__mm。

语文版小学五年级上学期语文期末综合复习课后练习单〔有答案〕

语文版小学五年级上学期语文期末综合复习课后练习单〔有答案〕班级：_____________ 姓名：_____________正确读音选一选1. 用“√”给下面的划线字选择正确的读音。

篝火（gōu gòu）燕园（yàn yān）点缀（zuì zhuì）无垠（yín xiàn）万顷（qīng qǐng）旖旎（yī yǐ）澄澈（dèng chéng）耄耋（dié zhì）渺小（miǎo miào）2. 用“\”画去括号中不正确的读音。

首都．（dōu dū）飘拂．（fúfó）差．不多（chāchà）直奔．（bēn bèn）电钮．（liǔniǔ）乘．车（chén chéng）3. 在正确的读音下面画“√”。

依偎．（wēi wèi）抖擞．（sǒu shù）待．着（dài dāi）强．迫（qiáng qiǎng）打搅．（jiǎo rǎo）便．宜（pián biàn）履．行（lǚlǔ）削．弱（xuēxiāo）4. 用“ ”画出加点字的正确读音。

威吓．（xià hè）提供．（gōng gòng）哗．笑（huà huá）晃．眼睛（huǎng huàng）踉．跄（niàng liàng）薄．弱（bó báo）湖泊．（pō bó）下绊．子（pàn bàn）5. 用“√”给加点的字选择正确的读音。

岂．止（qí qǐ）试卷．（juǎn juàn）便．宜（biàn pián）丞相．（xiànɡ xiānɡ）煞．气（shà shā）花蕾．（lěi léi）机械．（jiè xiè）水浒传．（zhuàn chuán）形近字词6. 辨字组词。

八上英语课课练答案八上英语课课练答案人教版

八上英语课课练答案八上英语课课练答案人教版20XX年-20XX年新版新目标英语八年级上Unit2课课练及答案(4份)Unit 2 Whats the matter?Practice 1作业导航Ⅰ.看图填空1.A:Whats the matter?B:I have a head__________and tooth__________. (共4份试题）2.A:Whats the __________?B:I have a st___m___ch.3.A:__________?B:I have a sore throat.4.A:Whats the matter?B:I __________ a cold.Ⅱ.情景对话(Doctor:D Patient:P)D: 1 the mater?P:I have a cold,cough!Cough!I have a terrible c 2 ,ouch!Head 3 ,Oh,my god,help me!D: 4 it easy.Let me exam.Open your mouth,ok,good,take your fever,please.Oh,38.9℃.You have a f 5 .You have a bad cold. P:Is it terrible?D:Maybe.You should 6 some medicine and go to bed for a good rest.I hope you feel 7 soon.P:Its very kind of you,doctor.Thanks a lot.D:My pleasure.Ⅲ.改错1.How long do you usually watch TV?A B C D 2.How often do you ill?Often.A B C D 3.Lucy was never away to school last term.A B C D 4.I usually does seven hours of sports every week.A B C D 5.There are a lot of fruit and vegetables in the basket.A B C DⅣ.按要求转换句型1.She often does housework at home.(改为一般疑问句) __________she often __________housework at home? 2.I bought some fruit this morning.(改为否定句)I__________ __________ __________ fruit this morning. 3.She never gets to school very early.(对划线部分提问)__________ __________ does she get to school very early. 4.I was away from school for about a week.(对划线部分提问)__________ __________ __________ you away from school?5.I think a chicken can swim.(改为否定句)I __________ __________ a chicken __________ swim.6.Miss Wang likes her students.(改为一般疑问句)__________ Miss Wang __________ her students?7.He cant hear anything.(改为同义句) He __________hear __________. 8.The dog likes to follow people.(对划线部分提问) __________ does the dog like __________ __________?参考答案Ⅰ.1.headache;toothache 2.matter;stomach3.Whats the matter?4.haveⅡ.1.Whats 2.cough 3.headache 4.Take 5.fever 6.take 7.betterⅢ.1.B long→often 2.C do→are 3.D to→from 4.A does→do 5.A are→isⅣ.1.Does;do 2.didnt buy any 3.How often 4.How long were5.dont think;can6.Does;like7.can;nothing8.What;to doUnit 2 Whats the matter?Practice 2作业导航Ⅰ.看图对话D:Whats the matter?A:Im not feeling well.I have a h __________and t__________.D:When did it start?A:About__________ago.D:Oh,that is too bad.You should __________.A:Yes,I think so.D:I hope you feel better soon.Next one ,whats the matter?Do you have a sore throat?B:__________.D:When did it start?B:__________.D:Oh,take it easy.You should take some medicine at first and have more water every day.You will be better soon.B:Thank you,doctor.D:__________.Ⅱ.自我提升Every morning in our class,Mr.Smith calls the roll.He calls the names of all the students,one after another,in alphabetical order(按字母表顺序).For example,he sa ys:“John White.”“Present.”“Helen Williams.”“Here.” “Henry Williams.” “Henrys absent today.”“Oh,yes.Henrys your pother.Wheres Henry today?”“Hes at home.Sir.”“He is sick.I suppose.”“Yes,sir.He has a bad cold.”“I hope he feels better tomorrow.”“Thank you,sir.”“Page 19,sir.”“Thank you.First lets read a few lines aloud for pronunciation (听写).And later,we can have some dictation (听写).John,you go to the black-board and write on the blackboard while the others write at their desks.You all like dictation,dont you?”“No.I like reading stories and translating (翻译)them,” John says.“Butdictation is important.It teaches you the correct spelling（拼写)of words and it also helps with pronunciation.”“Last time,I made twenty-five mistakes in spelling,” says John.“But how many words did I dictate?”“Twenty-six.”1.What does Mr.Smith do every morning in the English class?.2.How does he call the names of the class?.3.How do the students answer when Mr.Smith calls their names?.4.If a student is ill,does he usually go to school or stay at home?.Compression questions: 1.Do you say yes or no when Mr.Smith says that dictation is very important? . 2.Does your English teacher often or seldom give you dictation?.3.Do you find English spelling easy or difficult?.4.Do you make many or few mistakes in spelling your English?.Ⅲ.开心一刻Five Dollars a Visit(拜访一次5块钱)Miss White:(to Paul whose father is a doctor)Paul,if your work doesnt improve(改进),I think it will be necessary for me to call on your father.Paul:(politely)That will be fine,Miss White.His office hours are three to five,and his fee is five dollars a visit.参考答案Ⅰ.A:headache;toothache;A:two days;D:take some medicine; B:Yes.B:About two days ago.D:You are welcome.Ⅱ.1.He calls the roll every morning.2.He calls the names of all the students,one after another,in alphabetical order.3.They answer “present”or “Here”.4.He usually stays at home.Comprehsion question(略)Unit 2 Whats the matter?Ⅰ.你了解你身体的各个部位吗？请你写出他们的英语名称。

五年级上册数学教案-练习一-北师大版

五年级上册数学教案练习一北师大版教案：五年级上册数学练习一教学内容：1. 小数除以整数；2. 整数除以小数；3. 小数乘法；4. 分数的乘法；5. 分数的减法；6. 几何图形的面积。

教学目标：1. 使学生掌握小数除以整数、整数除以小数的运算方法；2. 使学生掌握小数乘法、分数乘法的运算方法；3. 使学生掌握分数的减法运算方法；4. 使学生掌握几何图形的面积计算方法。

教学难点与重点：1. 小数除以整数、整数除以小数的运算方法；2. 小数乘法、分数乘法的运算方法；3. 分数的减法运算方法；4. 几何图形的面积计算方法。

教具与学具准备：1. 教学PPT；2. 练习本；3. 计算器。

教学过程：一、实践情景引入（5分钟）1. 讲述一个关于购物的情景，引导学生思考如何计算总价。

二、例题讲解（15分钟）1. 小数除以整数：举例讲解，如2.5÷4；2. 整数除以小数：举例讲解，如12÷1.5；3. 小数乘法：举例讲解，如2.5×4.8；4. 分数乘法：举例讲解，如2/3×4/5；5. 分数的减法：举例讲解，如3/41/4；6. 几何图形的面积：举例讲解，如正方形的面积计算。

三、随堂练习（15分钟）1. 完成PPT上的练习题；2. 学生互相批改，教师讲解答案。

四、作业布置（5分钟）1. 请学生完成练习本上的相关题目；板书设计：1. 小数除以整数：2.5÷4；2. 整数除以小数：12÷1.5；3. 小数乘法：2.5×4.8；4. 分数乘法：2/3×4/5；5. 分数的减法：3/41/4；6. 几何图形的面积：正方形面积计算。

课后反思及拓展延伸：1. 学生对本节课的内容掌握情况；2. 学生在随堂练习和作业中的表现；3. 对于学习有困难的学生，可以进行个别辅导；4. 鼓励学生参加数学竞赛或拓展活动，提高数学素养。

作业设计：1. 练习本上的相关题目；答案：1. 练习本上的题目答案；重点和难点解析：一、实践情景引入二、例题讲解例题讲解环节是让学生掌握新知识的关键步骤。

1～5的认识

【第一课时】1～5的认识一、教学目标1. 学生会用1～5各数表示物体的个数，知道1～5的数序，能认、读、写1～5各数。

培养学生初步的观察能力和动手操作能力及认真书写的习惯。

2. 学生通过数、读、写等数学活动，经历从日常生活中抽象出数的过程，认识1～5各数，建立初步的数感。

3. 写数字时，养成书写认真，一丝不苟的良好习惯，从中感受到美育教育。

通过“野生动物园图”初步感知“用数学”的乐趣，感知生活中处处有数学，树立保护野生动物的意识。

二、教学重点1～5的基数含义和写法。

三、教学难点1～5的写法。

四、教学具准备课件、计数器、图、磁力教具、学具。

五、教学过程（一）从具体的人或物的数量抽象出数1．创设情景同学们，你们喜欢小动物吗？明明和你们一样，也特别喜欢小动物。

你们看，他和他的小伙伴就一起来到了动物园。

出示课件：动画：1～5的认识小动物可真多。

看看都有什么？快跟小组里的同学说说，你都看到了什么？分别有几个？（小组同学交流，教师巡视，引导学生对图上的人或物分类数，并进行有序的观察。

）2．学生在全班进行交流，请同学说出有什么，及其它们的数量。

3．教师根据学生的反馈，抽象出数1～5写在黑板上。

4．让学生对数1～5进行认读。

5．小结：同学们，你们从这幅美丽的画面中认识了数1、2、3、4、5，真能干。

如果没有了这些动物，花、树……我们的生活还会这样多姿多彩吗？因此，我们要爱护环境，爱护动物。

（二）巩固对数1～5的认识（此环节体现了由具体到抽象然后再应用）1．用学具表示数我们接着去参观。

【课件演示】（3只小鹿）你看到了什么？可以用数字几表示？你能用小棒表示吗？用3根小棒可以摆出一个三角形、一个汉字的“个”、一个英文字母“N”，谁愿意说2．学生任意拿相应的学具【课件演示】（4只鸭子在湖里游）你能用你自己喜欢的方式表示和鸭子同样多的数吗？学生可以拿4根小棒、4支铅笔、伸出4根手指等。

（可任意变化，还可小组进行）【课件演示】（5只小兔）说你用5根小棒摆出了什么图形？3．摆图形学生用自己喜欢的学具摆一个自己喜欢的图形，并根小组的同学说说你用了几种学具，它们各是几个？（三）感知1～5的顺序（此环节也可以借助计数器来让学生感知1—5的顺序）1．创设情景，感知1～5的顺序看到了这么多的小朋友，大象可开心了。

网络营销：理论、工具与方法2版-实训指导(1-5章)

网络营销：理论、工具与方法（第2版）实训指导书李东进秦勇陈爽主编人民邮电出版社2021年3月前言《网络营销》是一门实践性很强的学科，在教学过程中必须做到学以致用，理论与实践相结合。

受客观条件所限，我们不可能让学生都投入到网络营销实践中，但通过上机实训，模拟网络营销的真实情境，让同学们在虚拟的营销环境中接受训练，是一种非常好的替代方法。

故此，我们编写了本课程的实训指导。

其目的在于验证和加深学生所掌握的理论知识，训练学生的网络营销技能，并培养学生的科研能力、创新能力和探索精神。

本实训指导书紧密结合《网络营销：理论、工具与方法》（第2版）李东进、秦勇、陈爽编著的教材内容编写，共安排了15个实训项目。

实训项目一：认识网络营销的实现方式实训项目二：了解我国网民属性结构的变化实训项目三：掌握网络问卷调查方法实训项目四：熟悉网络广告策划实训项目五：抖音与快手短视频平台对比分析实训项目六：掌握APP推广策划实训项目七：掌握O2O营销的策略与方法实训项目八：掌握个人微信营销的策略与方法实训项目九：熟悉微博营销的运营实训项目十：掌握网络事件营销的策划实训项目十一：掌握网络软文撰写与推广的方法实训项目十二：熟悉大数据营销的策略与方法实训项目十三：撰写百度搜索引擎分析报告实训项目十四：掌握许可E_mail营销的策略与方法实训项目十五：熟悉网上开店的前期准备与流程每个实训项目由：实训目的、相关知识、实训内容及实训练习、实训拓展作业等组成。

其中相关知识供学生课前预习学习；实训内容及实训练习是上机实训课堂上要求完成的；实训拓展作业主要在课后完成。

实训项目可根据授课教师的需要选作。

本实训指导书仅作为内部使用，仅供大家参考使用，请勿外传！编者2021年3月实训项目一：认识网络营销的实现方式一、实训目的初步认识网络营销的企业网站营销、搜索引擎营销、交换链接营销、网络广告营销、许可E-mail营销、微信营销、会员制营销、病毒式营销、网络事件营销、网络视频营销、O2O营销、大数据营销等各种营销实现方式。

牛津上海版六年级上册英语Unit1-Unit5重点语法课后练习-最新

牛津上海版六年级上册英语Unit1-Unit5重点语法练习Wh-question&How-questionI. Complete the following sentences as required.（根据要求完成句子，每空一词）1. The network in this office will be ready in less than five minutes. (对划线部分提问)__________ __________ will the network in this office be ready?2. It cost Paul one thousand yuan to get his car fixed yesterday. (对划线部分提问)__________ __________ did it cost Paul to get his car fixed yesterday?3. There was heavy snow and windy weather this winter in Boston. (对划线部分提问)__________ and __________ was there heavy snow and windy weather?4. They went to the supermarket to buy some food for the picnic yesterday. (对划线部分提问) __________ __________ they go to the supermarket yesterday?5. My parents took me to camp in that forest park to celebrate my twelfth birthday.（对划线部分提问）________ did your parents take you to camp in that forest park________?6. My good friend writes to his parents twice a month. (对划线部分提问)__________ __________ does your good friend write to his parents?7.The Whites have been in their new flat for four months. (对划线部分提问)________ _________ have the White been in their new flat?8. Jim and his two friends went cycling along the lake yesterday afternoon. (对划线部分提问) __________ __________ Jim and his two friends do yesterday afternoon?9. Two plus six is eight. (对划线部分提问)__________ __________ is two plus six?10. They'll follow Susan's advice to arrange the celebration party. (对划线部分提问)__________ advice __________ they follow to arrange the celebration party?11.The magazine beside the TV is about how to protect the environment.（对划线部分提问）__________ __________is about how to protect the environment?12. It’s about ten minutes’ walk from may home to my school. (就划线部分提问)__________ _________ is it from my home to my school?13.The fisherman’s wife shouted at him angrily.（对划线部分提问）__________ __________ the fisherman’s wife shout at him ?14.The Greeks managed to capture the city of Troy through a trick.(对划线部分提问)__________ __________ the Greeks manage to capture the city of Troy?15.Miss Green has taught in the west of China since 2000. (对划线部分提问)__________ __________ has Miss Green taught in the west of China?16.Helen’s son is of average height and looks a bit fatter. (对划线部分提问)__________does Helen’s son look __________17. British families nowadays recycle about 22% of their waste. (对划线部分提问)__________ __________ of their waste do British families recycle nowadays?18. At the age of five, my little son weighed 25 kilograms. (对划线部分提问)__________ __________ did your little son weigh at the age of five?19. Henry Ford invented the world’s first assembly line in 1913. (对划线部分提问)__________ __________ Henry Ford invent the world’s first assembly line?________ ________ George do three different jobs?21.People get drinking water by taking away the salt from sea water.(对划线部分提问)________ ________ people get drinking water?22.It took Uncle Bob about two hours to finish the half marathon in Songjiang. (对划线部分提问) ________ ________ did it take Uncle Bob to finish the half marathon in Songjiang ?23.People all think the cartoon zootopia is interesting and wonderful.(对划线部分提问)__________do people__________ the cartoon zootopia?24.People used to travel to the island by ferry.（对划线部分提问）________ ________ people use to travel to the island.25. The shop is crowded with people because the Spring Festival is coming. (对划线部分提问)________ ________ the shop crowded with people?26. Our school praised Emma yesterday for her great efforts on that project. (对划线部分提问)________ ________ your school praise Emma yesterday?27.Vivian spends about half an hour listening to English programs every day.(对划线部分提问）________ ________ time does Vivian spend listening to English programs every day?28. The sea wave reached 10 meters in the storm. (对划线部分提问)________ ________ was the sea wave in the storm?29. The high-speed highway to the small town will be built in 2020.（对划线部分提问）________ ________ the high-speed highway to the small town be built?30. The top singing star’s set up his own charity to help those in need. (对划线部分提问)________ ________the pop singing star set up to help those in need?Keys:1.How soon 2.How much 3.When,where 4.Why did 5.What for 6.How often7.How long 8.What did 9.How much 10.Whose will 11.Which magazine12.How far13.How did 14.How did 15.How long 16.What like 17.How much 18.How much19.When did 20.Why did 21.How do 22.How long 23.How like 24.How did25.Why is 26.Why did 27.How much 28.How high 29.When will 30.What has II.八大时态一．用括号内所给单词的适当形式完成下列句子。

一年级上册数学教案第三单元：1-5的认识和加减法共10课时

一年级上册数学教案第三单元：1-5的认识和加减法（共10课时）第三单元：1-5的认识和加减法（共10课时）第一课时：1-5的认识教学内容：教科书第14～16页的内容。

教学目标：1.使学生会用1～5各数表示物体的个数，知道1～5的数序，能认读1～5各数，建立初步的数感。

2.培养学生初步的观察能力和动手操作能力。

体验与同伴互相交流学习的乐趣。

让学生感知生活中处处有数学。

教学重点：1～5基数含义的理解。

教学难点：培养学生合作交流的学习习惯，初步学会写数字和建立数感。

教具、学具准备：教师准备1～5的数字卡片、点子图；学生准备1～5的数字卡片、5个小圆片、5根小棒。

课时安排：1课时教学过程：一、从现实中抽象出数。

1.谈话：观察第14、15页主题图，你看到了什么?数一数有几个?2.跟周围的小伙伴交流，同时教师到各组共同交流并指导。

3.学生汇报。

4.教师根据汇报情况把卡片1～5贴在黑板上进行认读，同时让学生找出自己的数字卡片，并摆在桌子上。

二、反馈实践1.老师说一个数字，你能用小棒表示出来吗?你还能用其他方式表示吗?2.老师拿出3个苹果，你能用自己喜欢的方式表示出和老师同样多的苹果数吗?3.同桌之间考一考。

三、感知数的顺序1.逐次感知1～5的顺序。

学生先摆1个圆片，再摆1个是几?这个2是怎么得来的（依次感知3、4、5的来源。

）2.整体感知。

出示点子图，请学生给它们5个排排队。

四、开放性活动1.联系生活，丰富联想。

在日常生活中有哪些事物能用1～5表示?请学生列举生活中的事例。

(1)小组交流。

汇报。

2.猜数游戏。

提问：这个数比2大，可能是几这个数比4小，可能是几这个数比3大而且比5小，可能是几?只有这一种可能吗?3.用你们桌子上的圆片、小棒、卡片等摆出你喜欢的图形，并跟你的同伴说说分别用了几个学具。

小组活动。

五、学习写数：这些数你会写吗，谁愿意上来写一写？你认为写的时候要注意些什么？师示范，生学写。

六、小结：你学到了什么本领？板书设计： 1 2第二课时：第几和写数教学内容：教科书第18页的内容，第22页第7题、第9题。

北师大版八年级上册数学课本课后练习题答案(整理版)

八年级上册数学课后练习题答案（北师大版）第一章勾股定理课后练习题答案说明：因录入格式限制，“√”代表“根号”，根号下内用放在“（）”里面；“⊙”，表示“森哥马”，§，¤，♀，∮，≒，均表示本章节内的类似符号。

§1．l探索勾股定理随堂练习1．A所代表的正方形的面积是625；B所代表的正方形的面积是144。

2．我们通常所说的29英寸或74cm的电视机，是指其荧屏对角线的长度，而不是其长或宽，同时，因为荧屏被边框遮盖了一部分，所以实际测量存在误差．1．1知识技能1．(1)x=l0；(2)x=12．2．面积为60cm：，(由勾股定理可知另一条直角边长为8cm)．问题解决12cm2.1．2知识技能1．8m(已知直角三角形斜边长为10m，一条直角边为6m，求另一边长)．数学理解2．提示：三个三角形的面积和等于一个梯形的面积：联系拓广3．可以将四个全等的直角三角形拼成一个正方形．随堂练习12cm、16cm．习题1．3问题解决1．能通过.2．要能理解多边形ABCDEF’与多边形A’B’C’D’E’F’的面积是相等的．然后剪下△OBC和△OFE，并将它们分别放在图③中的△A’B’F’和△D’F’C’的位置上．学生通过量或其他方法说明B’E’F’C’是正方形，且它的面积等于图①中正方形ABOF和正方形CDEO的面积和。

即(B’C’)2=AB2+CD2：也就是BC2=a2+b2。

，这样就验证了勾股定理§l．2 能得到直角三角形吗随堂练习l．(1) (2)可以作为直角三角形的三边长．2．有4个直角三角影．(根据勾股定理判断)数学理解2．(1)仍然是直角三角形；(2)略；(3)略问题解决4．能．§1．3 蚂蚁怎样走最近13km提示：结合勾股定理，用代数办法设未知数列方程是解本题的技巧所在.习题1．5知识技能1．5lcm．问题解决2．能．3．最短行程是20cm。

4．如图1～1，设水深为x尺，则芦苇长为(x+1)尺，由勾股定理解得x=12，则水池的深度为12尺，芦苇长为13尺。

小班数学教案及教学反思《认识数字1-5》两篇

小班数学教案及教学反思《认识数字1-5》两篇篇一：《认识数字1-5》活动设计背景：我园小班幼儿多居于乡下，个别幼儿不会数数、不会按顺序读数、有些幼儿喜欢读数可是老把数字的顺序搞混淆。

孩子们的年龄偏小，农民一年四季只有冬季有时间，针对乡下的种种局限因素，为了使幼儿能够很好的掌握科学领域的数学部分，设计了这节课。

活动目标：1、情感目标：幼儿体会与同伴游戏时候的欢乐，喜欢做游戏。

2、认知目标：会认读数字宝宝1-5。

3、能力目标：能大声地读出数字1-5中的某一个简单的知道数字宝宝的笔画。

4、引导幼儿积极与材料互动，体验数学活动的乐趣。

5、发展幼儿逻辑思维能力。

教学重难点：教学重点：幼儿能认读出数字1-5。

教学难点：幼儿能够大胆的读出数字1-5之间的任何一个。

活动准备：数字宝宝卡片1-5各一张、数字宝宝的纸手套若干、数字挂图、动物卡片活动过程：一、开始部分教师带领幼儿做简单的手指游戏，引导幼儿认识手，并且知道小手的手指数量。

二、基础部分我们有两只小手，每只小手上有5根手指头。

请小朋友和老师一起来数一数。

(教师导幼引儿伸出自己的手，和老师一起数一数。

)数完手指以后，出示数字卡片。

请小朋友来认一认这是数字几。

鸭妈妈生了5个鸭蛋，最近要孵出鸭宝宝了。

请你看一看它孵出了几只。

按照这样的程序从一到五鸭妈妈孵出了五只鸭宝宝。

把相应的数字1-5贴在鸭宝宝的下面。

教师把数字挂图以及相应的有数量的图片出示在黑板上，[本.文来源：屈老.师教案网]带领幼儿说儿歌，识记数字1-5.儿歌：1像粉笔会写字、2像小鸭水里游、3像耳朵听声音、4像小旗迎风飘、5像钩子能买菜。

(教师边说儿歌边做动作，幼儿可以很上口，便于记忆)三、结束部分教师带领幼儿做游戏，请幼儿将纸手套戴在手上，找出和自己手套上相同数字的伙伴，并且唱出找朋友的儿歌。

然后带领幼儿说儿歌。

整理教具下课。

教学反思本节课选课的内容对于小班的孩子来说，有一点点的偏难。

只是简单的认识数字1就可以了!这节课的内容其实可以作为主题教学，可以在一到二星期上完本节内容。

小学数学_1~5以内的加减法练习课教学设计学情分析教材分析课后反思

人教版一年级数学上册《1---5的加减法练习课》教学设计一、教学内容人教版一年级数学上册第26--27页二、教学目标（一）知识与技能理解加减法的含义，能够正确理解图意，写出相关算式，并能根据算式说出图意，能熟练的口算5以内的加减法。

（二）过程与方法在观察中体会图意，在说一说，算一算中理解算理，学以致用。

（三）情感态度与价值观在活动情境中体验数学的快乐，产生对学习数学的兴趣。

三、教学重难点教学重点：理解加减法的含义，能够正确理解图意，能熟练的口算5以内的加减法。

教学难点：能在实际生活中熟练应用加减法。

四、教学准备多媒体课件、答题纸（学生一人一份）五、教学过程（一）活动引入，计算练习师：同学们，想不想到野生动物园看小动物们？现在就跟老师乘着火车到野生动物园看看吧，不过，坐火车需要什么？生：车票。

师：对，所以小朋友要想上火车还要拿到车票，现在老师来检验一下，哪些小朋友能拿到车票。

1.分与合2.智慧爷爷的苹果树师：看哪位小朋友能摘到智慧爷爷种的苹果，谁愿意来试试。

3.我的火车开的快师：最后一轮检验，我们看哪组的小火车开的又快又稳。

火车开动......（二）活动进行，体会加减法的含义师：火车经过一片山坡，看山坡上都有哪些小动物？你能根据算式说说小动物发生了什么事吗？小结：从这几个算式中我们知道求一共有多少，就是把两部分合起来，用加法，求还剩多少就是总数里面减去一部分用减法。

师：小朋友真棒，我们的火车继续往前开....（三）活动高潮，解决问题师：你看我们的火车又经过了一片大海，看，小猫要干什么呢？生：小猫要去钓鱼。

师：对，我们都要给它加油，它能钓几条鱼？大海里还剩几条鱼？（演示课件）1.（第一幅图）师：小猫钓了几条鱼?生：一条。

师：你能把小猫钓鱼的过程完整的说一遍，提出问题，并列一个算式吗？学生口头说算式。

2.（第二幅图）---（第五幅图）过程同上。

过渡语：小朋友非常厉害，不仅能细致观察，还能清楚地表达，并解决小猫留给我们的问题。

冀教版七年级英语上册课后基础练习五十四(含答案)

冀教版七年级英语上册课后基础练习五十四（含答案）一、根据提示写出单词的正确形式1 There are some novels and m__________ (杂志) in the library.2 The girl goes to the c__________ (音乐会) to listen to music every weekend.3 I often buy a p__________ (礼物) for my mother on Mother’s Day.4 It’s too e__________ (昂贵的). I don’t have enough money.5 She sends an English book to her best friend on a s__________ (特别的) day.6 Kathy’s home is next to her school. She u__________ walks to school.7 Watching football m__________ on TV is my favourite.8 I often h__________ from my brother but this month I don’t.二、用方框中所给单词的适当形式填空（每词限用一次）1 —Who is your favourite __________?—Jay Chou.2 How __________ she is today!3 There are two pears (梨) in front of him and he __________ the small one.4 Today is a __________ day for my parents.5 The little girl is __________ to see the big tiger.三、单项填空1 There is a big cake on the table. Please __________ it for children.A. giveB. cutC. chooseD. spend2 —Who has a dictionary, children?—I have __________.A. themB. itC. theyD. one3 Her sister __________ gets up early because she walks to school every day.A. alwaysB. sometimesC. hardlyD. never4 In our school, all the students __________ school uniforms.A. wearB. dressC. put onD. dress up5 —Do you like watching TV, Kate?—Yes, I __________ TV in the evening.A. never watchB. watch alwaysC. watch sometimesD. often watch6 I usually send a Christmas (圣诞节) card __________ my teacher on Christmas Day.A. atB. toC. inD. for7 I never spend too much time __________ television.A. to watchB. to seeC. watchingD. seeing8 —Happy birthday to you!—__________.A. Fine, thank youB. You are rightC. Thank youD. Me, too9 —__________ does he watch China’s Got Talent (《中国达人秀》)?—Sometimes.A. How soonB. How oftenC. How longD. How much10 —Do you often __________ your father?—Yes, I get a letter from him every week.A. hear fromB. hear ofC. come fromD. talk with1 . She is thirty years old. She is our 2in our school and we 3 her very much. We 4 lots of presents to her. The cold winter is coming, soI 5 a red scarf for her. She likes it very much. Some of my classmates buy flowers 6 her. She7 many flowers on her desk when she comes into the classroom.We have a birthday 8 at night. We sing a birthday song and dance for her. She also 9 games with us. We’re glad to see her 10 face.能力提升阅读理解AMike is a boy from Beijing. He likes the summer holiday (暑假). The summer holiday is coming. Mike’s mother is planning a trip to Hong Kong with her son, because Mike’s aunt lives there. They are going there by air. As usual, Mike’s mother should prepare (准备) some presents.Mike’s aunt likes eating dumplings and she also likes li stening to music. She is a secretary (秘书) in a big company.Mike’s cousin is a student at a senior high school (高中). He is in the school football team. He is a football fan. He wants to be a player like David Beckham. David Beckham is the most famous football player in England.Mike’s uncle is an interesting man. He doesn’t like smoking or drinking wine. His favourite hobby is cooking. He is a cook in a big hotel.This Sunday, Mike’s mother will go to the supermarket and buy something for them. They think t hey will have a good trip. Good luck!1 Mike’s aunt will get __________ as a present.A. a lot of CDsB. basketball shoesC. a little birdD. a book about dumplings2 How are Mike and his mother going to Mike’s aunt’s this summer holiday?A. By air.B. By ship.C. By train.D. By subway.3 Where does Mike’s aunt live?A. Beijing.B. Hong Kong.C. London.D. New York.4 Why does Mike’s mother go to the supermarket?A. Because she wants to buy something for herself.B. Because she would like to buy dumplings for Mike.C. Because she is the secretary in the supermarket.D. Because she wants to buy presents for Mike’s aunt’s family.5 When will Mike and his mother go to his aunt’s?A. In spring.B. In summer.C. In autumn.D. In winter.BToday is Alice’s 13th birthday. Her parents hold a party for her. A lot of friends come to her home. She is happy to meet them. They bring lots of things for Alice: a birthday cake, some nice cards, books, pens and clothes. And they say “Happy birthday” to Alice. Alice is very happy and says, “Dear friends, thank you very much for coming to my birthday party.” Then they sit down and talk. Alice’s mother goes to cook a big lunch. The meal is very nice. And they all like it very much. After lunch, they sing, play games and eat the big birthday cake. Theyhave a good time. At 5 :00 in the afternoon, Alice’s friends say goodbye to her and go back home.根据短文内容，回答下列问题6 What do Alice’s parents do for her birthday?____________________________________________________________7 Who comes to Alice’s home?____________________________________________________________8 What do Alice’s friends bring to her?____________________________________________________________9 What do Alice and her friends do after lunch?____________________________________________________________10 How does Alice feel today?____________________________________________________________参考答案一、根据提示写出单词的正确形式1. magazines 句意：图书馆有一些小说和杂志。

人教版高考物理一轮总复习课后习题第2单元相互作用实验练2探究弹簧弹力与形变量的关系

实验练2探究弹簧弹力与形变量的关系1.(浙江金丽衢十二校高三三模)某兴趣小组为了研究系头发用的普通橡皮筋产生的弹力与其伸长量之间的关系。

分别用细绳系在橡皮筋的两端,一端系在墙上的钉子上,另一端挂小桶,装置如图甲所示。

甲①挂上重为G0=0.05 N的小桶(可用沙子配重)后,测出橡皮筋的伸长量。

②撤去小桶看橡皮筋是否回到原来位置,以保证橡皮筋在弹性限度内;在小桶内加入一个重为G0的重物后,再测出橡皮筋的伸长量。

③重复步骤②,测量多组数据如下表所示。

(1)选择前6组数据,作F-x图像如图乙所示,6个点几乎落在同一条过原点的直线上,由图乙可知,当橡皮筋伸长量较小时,橡皮筋产生的弹力与橡皮筋的伸长量之间近似满足胡克定律,则橡皮筋的劲度系数为k=N/m(结果保留两位有效数字)。

乙(2)选择全部数据,作F-x图像如图丙所示,可知随着橡皮筋伸长量的增加,橡皮筋的劲度系数(选填“增加”“减小”或“不变”)。

丙(3)通过以上分析,可得出实验结论为。

2.(浙江衢州期末)在“探究弹簧弹力与形变量的关系”实验中,按实验要求组装好实验器材,待弹簧自由下垂并静止时,测出弹簧的长度,如图甲所示,其大小为l0= cm;在弹簧的弹性限度内,依次在弹簧下端挂上1个钩码、2个钩码、3个钩码(已知1个钩码的质量为50 g)……每一次在钩码处于静止时测出弹簧的长度l,以所挂钩码的个数n为纵坐标,以弹簧长度l为横坐标,建立坐标系,并将测量得到的数据在坐标系中描点,如图乙所示,在图乙中描出不挂钩码的点并作出n-l关系图像,求出弹簧的劲度系数为N/kg(计算结果保留三位有效数字)。

考虑到重力对竖直放置弹簧的影响,该实验方案得到的弹簧劲度系数与实际值相比(选填“偏小”“相同”或“偏大”)。

3.(浙江宁波高三二模)在“探究弹簧弹力与形变量之间关系”的实验中(1)将弹簧悬挂在铁架台上,将刻度尺固定在弹簧一侧,弹簧轴线和刻度尺都应在(选填“水平”或“竖直”)方向;(2)弹簧自然悬挂,待弹簧稳定时,长度记为L自,弹簧下端挂上砝码盘稳定时,长度记为L0,在砝码盘中每次增加10 g砝码,弹簧稳定时长度依次记为L1至L6,数据如下表,表中有一个数值记录不符合规范,其长度符号为;(3)以砝码的质量为纵轴,弹簧总长度与L0的差值为横轴建立直角坐标系,根据表中数据描绘出m-t图像;(4)根据m-(结果保留两位有效数字,重力加速度g取10 m/s2)。

人教版高考物理一轮总复习课后习题第4单元实验练6探究向心力大小与半径、角速度、质量的关系

实验练6探究向心力大小与半径、角速度、质量的关系1.某实验小组利用如图所示的装置进行“探究向心力大小与半径、角速度、质量的关系”实验。

转动手柄,可使变速塔轮、长槽和短槽随之匀速转动。

塔轮自上而下有三层,每层左、右半径之比均不同。

左、右塔轮通过皮带连接,并可通过改变皮带所处层来改变左、右塔轮的角速度之比。

实验时,将两个小球分别放在短槽C处和长槽的A(或B)处,A、C到左、右塔轮中心的距离相等,两个小球随塔轮做匀速圆周运动,向心力大小关系可由标尺露出的等分格的格数判断。

(1)在研究向心力的大小F与质量m、角速度ω和半径r之间的关系时我们主要用到了物理学中的方法(填选项前的字母);A.理想实验法B.等效替代法C.控制变量法D.演绎法(2)实验中某同学把两个质量相等的钢球放在A、C位置,皮带所连接的左、右变速塔轮的半径之比为3∶1,转动手柄,观察左右标出的刻度,回答下列两个问题:①该操作过程可用来探究向心力大小F与(填选项前的字母);A.质量m的关系B.半径r的关系C.角速度ω的关系②该同学准确操作实验,则在误差允许范围内,标尺上的等分格显示出左、右两个小球所受向心力之比为。

2.(浙江东阳高三三模)某班级同学在探究向心力大小的表达式实验时: 第一小组采用甲图所示的装置进行探究,两个变速塔轮通过皮带连接,转动手柄使长槽和短槽分别随变速塔轮匀速转动,槽内的钢球就做匀速圆周运动。

横臂的挡板对钢球的压力提供向心力,钢球对挡板的反作用力通过横臂的杠杆作用使弹簧测力筒下降,从而露出标尺,标尺上的红白相间的等分格显示出两个钢球所受向心力的比值。

第二小组采用乙图所示的装置进行探究,滑块套在水平杆上,随水平杆一起绕竖直杆做匀速圆周运动,力传感器通过一细绳连接滑块,用来测量向心力F的大小。

滑块上固定一遮光片,宽度为d,光电门可以记录遮光片通过的时间,测得旋转半径为r。

滑块随杆匀速圆周运动,每经过光电门一次,通过力传感器和光电门就同时获得一组向心力F和角速度ω的数据。

5-1生态系统的结构(2课时)(教案).doc

呼市21中学新课程有效教学教案《5・1生态系统的结构》教学设计教案学校名称：呼市21中学学科：生物授课年级：高二教师：王颖课时：2课时课型：问题生成解决课拓展训练课授课日期：教学目标知识与技能：1、了解生态系统的概念及其组成成分2、理解生态系统四种组分的功能地位及相互关系过程与方法：1、通过指导学生归纳生态系统的组成成分，培养学生分析综合和推理的思维能力。

2、尝试构建生态系统的结构模型，培养学生思维能力和想象能力。

情感态度与价值观：1.通过对生态系统各成分间是紧密联系、缺一不可的学习，进行保护生态环境重要性的教育。

2.通过学习牛态系统的结构，可知生态系统是一个生物与环境组成的统一整体，生物与环境是相互联系、相互影响的，从而对学生进行辩证唯物主义观点的教育。

教学重点：讨论某一生态系统的结构。

教学难点：说明牛态系统是一个统一的整体。

教学方法：自主学习法、合作探究法、小组讨论法教学准备：导读单、训练单教学过程：第一课时发现生成课授课时间一、创设情境，导入新课：1、师导入：在地球的表面儿乎到处都有生机勃勃的生物，它们在不同的环境中生存和繁衍，地球上的牛物和它牛活的环境共同构成了牛态系统，今天这节课我们学习的内容就是生态系统的结构。

二、自主阅读，走进文本1、结合手中的材料，查阅相关书籍，通读全文一遍。

2、带着问题，运用查、划、写、记、练、思阅读六字诀，整体感知全文，并完成《问题导读单》。

3、【思考、讨论】以学生为主，多个学生补充。

三、创设问题、生成评价学生通过交流自由学习时的收获，在学科长的组织下整合本组生成的共性问题。

四、汇报交流，达成共识学生：分组进行展讲，进行全班交流。

教师：组织全班交流，补充学生未讲到的知识点，并进行精讲和点评。

具体流程如下：【问题探究】如图，生态球是一个由透明的玻璃组成的细小、封闭的球体，球体内部有水、沙、无机盐等，还有水草、藻类、鱼和微生物；光线从外部向瓶内辐射，瓶内外不断进行热交换，球内的藻类、水草和鱼能长时间生活。