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新人教版高中英語選修2Unit 2 Using langauge-Listening教學(xué)設(shè)計(jì)
? B: Absolutely! Getting involved with Chinese cultural activities there definitely helped a lot. I got to practice my Chinese on a daily basis, and I could learn how native Chinese speakers spoke.? A: What do you feel is your biggest achievement?? B: Learning Chinese characters! I have learnt about 1,500 so far. When I first started, I didn't think it was even going to be possible to learn so many, but now I find that I can read signs, menus, and even some easy newspaper articles.? A: What are you most keen on?? B: I've really become keen on learning more about the Chinese culture, in particular Chinese calligraphy. As I have learnt Chinese characters, I have developed a great appreciation for their meaning. I want to explore Chinese characters by learning how to write them in a more beautiful way. ? A: Finally, what do you want to say to anyone interested in learning Chinese?? I have really become keen on learning more about the Chinese culture, in particular Chinese Calligraphy. As I have learnt Chinese character, I have developed a great appreciation for their meaning. I want to explore Chinese characters by learning how to write them in a more beautiful way.? A: Finally, what do you want to say to anyone interested in learning Chinese?? B: I'd say, give it a shot! While some aspects may be difficult, it is quite rewarding and you will be happy that you tried.? A: Thanks for your time. ? B:You're welcome.
新人教版高中英語選修2Unit 4 Learning about Language教學(xué)設(shè)計(jì)
This section guides students to pay attention to the typical context of vocabulary use, helps students accumulate vocabulary around the key vocabulary of this unit, and uses the learned words and word chunks in different contexts to deeply understand their meaning and usage, so as to achieve the purpose of review and consolidation.The teaching design activities aim to guide students to pay attention to the typical context in which the target vocabulary is used, as well as the common vocabulary used in collocation, so that students can complete the sentence with correct words. In terms of vocabulary learning strategies, this unit focuses on cultivating students' ability to pay attention to collocation of words and to use word blocks to express meaning.For vocabulary learning, it is not enough just to know the meaning of a single word, but the most important thing is to master the common collocations of words, namely word blocks.Teachers should timely guide students to summarize common vocabulary collocation, such as verb and noun collocation, verb and preposition collocation, preposition and noun collocation, and so on.1. Guide students to understand and consolidate the meaning and usage of the vocabulary in the context, 2. Guide the students to use the unit topic vocabulary in a richer context3. Let the students sort out and accumulate the accumulated vocabulary, establishes the semantic connection between the vocabulary,4. Enable students to understand and master the vocabulary more effectivelyGuiding the Ss to use unit topic words and the sentence patterns in a richer context.
新人教版高中英語選修2Unit 4 Reading for writing教學(xué)設(shè)計(jì)
假定你是英國的Jack，打算來中國旅行，請你給你的中國筆友李華寫一封信，要點(diǎn)如下：1．你的旅行計(jì)劃：北京→泰山→杭州；2．征求建議并詢問他是否愿意充當(dāng)你的導(dǎo)游。注意：1.詞數(shù)80左右(開頭和結(jié)尾已給出，不計(jì)入總詞數(shù))；2．可以適當(dāng)增加細(xì)節(jié)，以使行文連貫。參考詞匯：故宮 the Forbidden City；泰山 Mount TaiDear Li Hua，I'm glad to tell you that 'm going to visit China.First，I am planning to visit Beijing，the capitalof China，where I am looking forward to enjoying the Great Wall，the Forbidden City and somebeautiful parks.Then I intend to go to visit Mount Tai in Shandong Province.I've heard that it is one ofthe most famous mountains in China and I can't wait to enjoy the amazing sunrise there.After that，I amalso going to Hangzhou.It is said that it is a beautiful modern city with breathtaking natural sights，among which the West Lake is a well- known tourist attraction.What do you think of my travel plan? Will you act as my guide? Hope to hear from you soon.
新人教版高中英語選修2Unit 4 Using langauge-Listening教學(xué)設(shè)計(jì)
The theme of the listening section is " talking about scenery and culture along a journey."The part is designed to further lead the students to understand Canadian natural geography and social environment, and integrated into the cultural contrast by mentioning the long train journey from Beijing to Moscow routes. On this basis, the part activates students related travel experience, lets the student serial dialogue, guides the student to explore further the pleasure and meaning of the long journey, and Chinese and foreign cultural comparison.The part also provides a framework for the continuation of the dialogue, which is designed to provide a framework for students to successfully complete their oral expressions, and to incorporate an important trading strategy to end the dialogue naturally.1. Help students to understand and master some common English idioms in the context, and experience the expression effect of English idioms.2. Guide the students to understand the identity of different people in the listening context, and finish the dialogue according to their own experience.3. Instruct the students to use appropriate language to express surprise and curiosity about space and place in the dialogue, and master the oral strategy of ending the dialogue naturally.1. Instruct students to grasp the key information and important details of the dialogue.2. Instruct students to conduct a similar talk on the relevant topic.
新人教版高中英語選修2Unit 5 Reading and thinking教學(xué)設(shè)計(jì)
The theme of this activity is to learn the first aid knowledge of burns. Burns is common in life, but there are some misunderstandings in manual treatment. This activity provides students with correct first aid methods, so as not to take them for granted in an emergency. This section guides students to analyze the causes of scald and help students avoid such things. From the perspective of text structure and collaborative features, the text is expository. Expository, with explanation as the main way of expression, transmits knowledge and information to readers by analyzing concepts and elaborating examples. This text arranges the information in logical order, clearly presents three parts of the content through the subtitle, accurately describes the causes, types, characteristics and first aid measures of burns, and some paragraphs use topic sentences to summarize the main idea, and the level is very clear.1. Guide students to understand the causes, types, characteristics and first aid methods of burns, through reading2. Enhance students’ ability to deal withburnss and their awareness of burns prevention3. Enable students to improve the ability to judge the types of texts accurately and to master the characteristics and writing techniques of expository texts.Guide students to understand the causes, types, characteristics and first aid methods of burns, through readingStep1: Lead in by discussing the related topic:1. What first-aid techniques do you know of ?CPR; mouth to mouth artificial respiration; the Heimlich Manoeuvre
大班科學(xué)教案：快樂轉(zhuǎn)轉(zhuǎn)轉(zhuǎn)
活動準(zhǔn)備： 1、各種可以轉(zhuǎn)動的物體（風(fēng)車、發(fā)條玩具、陀螺、皮球、杯子、塑料盆、積木、雪花片、椅子、溜溜球、繩子、筷子、牙簽等） 2、音樂“圓舞曲”，錄音機(jī)活動過程： 一、玩轉(zhuǎn)動玩具，初步獲得有關(guān)轉(zhuǎn)動的經(jīng)驗(yàn)，感受有趣的轉(zhuǎn)動現(xiàn)象。 1、教師提出游戲要求：玩玩具的時候仔細(xì)觀察，說一說你是怎么玩的，有什么發(fā)現(xiàn)。 2、幼兒自選玩具操作，教師引導(dǎo)幼兒用語言交流自己的玩法和發(fā)現(xiàn)。 3、小結(jié)：通過手的運(yùn)動，這些玩具都能轉(zhuǎn)動起來。 二、提供生活中常見的一些能轉(zhuǎn)動的物品和體育器械，引導(dǎo)幼兒用多種方法使它們轉(zhuǎn)動。 1、幼兒嘗試轉(zhuǎn)動自己的小椅子，教師引導(dǎo)：“它能轉(zhuǎn)動嗎？怎樣轉(zhuǎn)呢？” 2、教師：“這兒還有許多玩具，它們能轉(zhuǎn)動嗎？現(xiàn)在我們來比一比，看誰能用更多的方法讓它們轉(zhuǎn)動起來?！?3、幼兒操作，教師鼓勵幼兒運(yùn)用多種方法使物體轉(zhuǎn)動。 4、幼兒交流自己的轉(zhuǎn)動方法。
新人教版高中英語選修2Unit 1 Science and Scientists-Discovering useful structures教學(xué)設(shè)計(jì)
The grammatical structure of this unit is predicative clause. Like object clause and subject clause, predicative clause is one of Nominal Clauses. The leading words of predicative clauses are that, what, how, what, where, as if, because, etc.The design of teaching activities aims to guide students to perceive the structural features of predicative clauses and think about their ideographic functions. Beyond that, students should be guided to use this grammar in the context apporpriately and flexibly.1. Enable the Ss to master the usage of the predicative clauses in this unit.2. Enable the Ss to use the predicative patterns flexibly.3. Train the Ss to apply some skills by doing the relevant exercises.1.Guide students to perceive the structural features of predicative clauses and think about their ideographic functions.2.Strengthen students' ability of using predicative clauses in context, but also cultivate their ability of text analysis and logical reasoning competence.Step1: Underline all the examples in the reading passage, where noun clauses are used as the predicative. Then state their meaning and functions.1) One theory was that bad air caused the disease.2) Another theory was that cholera was caused by an infection from germs in food or water.3) The truth was that the water from the Broad Street had been infected by waste.Sum up the rules of grammar:1. 以上黑體部分在句中作表語。2. 句1、2、3中的that在從句中不作成分，只起連接作用。 Step2: Review the basic components of predicative clauses1.Definition
新人教版高中英語選修2Unit 4 Journey Across a Vast Land教學(xué)設(shè)計(jì)
當(dāng)孩子們由父母陪同時，他們才被允許進(jìn)入這個運(yùn)動場。3．過去分詞(短語)作狀語時的幾種特殊情況(1)過去分詞(短語)在句中作時間、條件、原因、讓步狀語時，相當(dāng)于對應(yīng)的時間、條件、原因及讓步狀語從句。Seen from the top of the mountain (＝When it is seen from the top of the mountain), the whole town looks more beautiful.從山頂上看，整個城市看起來更美了。Given ten more minutes (＝If we are given ten more minutes), we will finish the work perfectly.如果多給十分鐘，我們會完美地完成這項(xiàng)工作。Greatly touched by his words (＝Because she was greatly touched by his words), she was full of tears.由于被他的話深深地感動，她滿眼淚花。Warned of the storm (＝Though they were warned of the storm), the farmers were still working on the farm.盡管被警告了風(fēng)暴的到來，但農(nóng)民們?nèi)栽谵r(nóng)場干活。(2)過去分詞(短語)在句中作伴隨、方式等狀語時，可改為句子的并列謂語或改為并列分句。The teacher came into the room, followed by two students (＝and was followed by two students)．后面跟著兩個學(xué)生，老師走進(jìn)了房間。He spent the whole afternoon, accompanied by his mom(＝and was accompanied by his mom)．他由母親陪著度過了一整個下午。
新人教版高中英語選修2Unit 1 Science and Scientists-Learning about Language教學(xué)設(shè)計(jì)
Step 7: complete the discourse according to the grammar rules.Cholera used to be one of the most 1.__________ (fear) diseases in the world. In the early 19th century, _2_________ an outbreak of cholera hit Europe, millions of people died. But neither its cause, 3__________ its cure was understood. A British doctor, John Snow, wanted to solve the problem and he knew that cholera would not be controlled _4_________ its cause was found. In general, there were two contradictory theories 5 __________ explained how cholera spread. The first suggested that bad air caused the disease. The second was that cholera was caused by an _6_________(infect) from germs in food or water. John Snow thought that the second theory was correct but he needed proof. So when another outbreak of cholera hit London in 1854, he began to investigate. Later, with all the evidence he _7_________ (gather), John Snow was able to announce that the pump water carried cholera germs. Therefore, he had the handle of the pump _8_________ (remove) so that it couldn't be used. Through his intervention，the disease was stopped in its tracks. What is more, John Snow found that some companies sold water from the River Thames that __9__________________ (pollute) by raw waste. The people who drank this water were much more likely _10_________ (get) cholera than those who drank pure or boiled water. Through John Snow's efforts, the _11_________ (threaten) of cholera around the world saw a substantial increase. Keys： 1.feared 2.when 3. nor 4.unless 5.that/which 6.infection 7.had gathered 8.removed 9.was polluted 10.to get 11. threat
新人教版高中英語選修2Unit 1 Science and Scientists-Reading and thinking教學(xué)設(shè)計(jì)
Step 5： After learning the text, discuss with your peers about the following questions:1.John Snow believed Idea 2 was right. How did he finally prove it?2. Do you think John Snow would have solved this problem without the map?3. Cholera is a 19th century disease. What disease do you think is similar to cholera today?SARS and Covid-19 because they are both deadly and fatally infectious, have an unknown cause and need serious public health care to solve them urgently.keys:1. John Snow finally proved his idea because he found an outbreak that was clearly related to cholera, collected information and was able to tie cases outside the area to the polluted water.2. No. The map helped John Snow organize his ideas. He was able to identify those households that had had many deaths and check their water-drinking habits. He identified those houses that had had no deaths and surveyed their drinking habits. The evidence clearly pointed to the polluted water being the cause.3. SARS and Covid-19 because they are both deadly and fatally infectious, have an unknown cause and need serious public health care to solve them urgently.Step 6: Consolidate what you have learned by filling in the blanks:John Snow was a well-known _1___ in London in the _2__ century. He wanted to find the _3_____ of cholera in order to help people ___4_____ it. In 1854 when a cholera __5__ London, he began to gather information. He ___6__ on a map ___7___ all the dead people had lived and he found that many people who had ___8____ (drink) the dirty water from the __9____ died. So he decided that the polluted water ___10____ cholera. He suggested that the ___11__ of all water supplies should be _12______ and new methods of dealing with ____13___ water be found. Finally, “King Cholera” was __14_____.Keys: 1. doctor 2. 19th 3.cause 4.infected with 5.hit 6.marked 7.where 8.drunk 9.pump 10.carried 11.source 12.examined 13.polluted 14.defeatedHomework: Retell the text after class and preview its language points
新人教版高中英語選修2Unit 1 Science and Scientists-Using langauge教學(xué)設(shè)計(jì)
This happens because the dish soap molecules have a strong negative charge, and the milk molecules have a strong positive charge. Like magnets, these molecules are attracted to each other, and so they appear to move around on the plate, taking the food coloring with them, making it look like the colors are quickly moving to escape from the soap.Listening text:? Judy: Oh, I'm so sorry that you were ill and couldn't come with us on our field trip. How are you feeling now? Better?? Bill: Much better, thanks. But how was it?? Judy: Wonderful! I especially liked an area of the museum called Light Games.it was really cool. They had a hall of mirrors where I could see myself reflected thousands of times!? Bill: A hall of mirrors can be a lot of fun. What else did they have?? Judy: Well, they had an experiment where we looked at a blue screen for a while, and then suddenly we could see tiny bright lights moving around on it. You'll never guess what those bright lights were!? Bill: Come on, tell me!? Judy: They were our own blood cells. For some reason, our eyes play tricks on us when we look at a blue screen, and we can see our own blood cells moving around like little lights! But there was another thing I liked better. I stood in front of a white light, and it cast different shadows of me in every color of the rainbow!? Bill: Oh, I wish I had been there. Tell me more!? Judy: Well, they had another area for sound. They had a giant piano keyboard that you could use your feet to play. But then, instead of playing the sounds of a piano, it played the voices of classical singers! Then they had a giant dish, and when you spoke into it, it reflected the sound back and made it louder. You could use it to speak in a whisper to someone 17 meters away.? Bill: It all sounds so cool. I wish I could have gone with you? Judy: I know, but we can go together this weekend. I'd love to go there again!? Bill: That sounds like a great idea!
新人教版高中英語選修2Unit 2 Bridging Cultures-Discovering useful structures教學(xué)設(shè)計(jì)
The grammar of this unit is designed to review noun clauses. Sentences that use nouns in a sentence are called noun clauses. Nominal clauses can act as subject, object, predicate, appositive and other components in compound sentences. According to the above-mentioned different grammatical functions, nominal clauses are divided into subject clause, object clause, predicate clause and appositive clause. In this unit, we will review the three kinds of nominal clauses. Appositive clauses are not required to be mastered in the optional compulsory stage, so they are not involved.1. Guide the students to judge the compound sentences and determine the composition of the clauses in the sentence.2. Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.3. Inspire the students to systematize the function and usage of noun clause1.Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.2.Inspire the students to systematize the function and usage of noun clauseStep1: The teacher ask studetns to find out more nominal clauses from the reading passage and udnerline the nominal clauses.
新人教版高中英語選修2Unit 5 First Aid-Discovering useful structures教學(xué)設(shè)計(jì)
You have no excuse for not going.你沒有理由不去。He was punished for not having finished his homework.他因未完成作業(yè)而受到懲罰。2．動詞ing形式復(fù)合結(jié)構(gòu)由物主代詞或人稱代詞賓格、名詞所有格或普通格加動詞ing，即“sb./sb.'s＋doing”構(gòu)成。動詞ing形式的復(fù)合結(jié)構(gòu)實(shí)際上是給動詞ing形式加了一個邏輯主語。動詞ing形式的復(fù)合結(jié)構(gòu)有四種形式：①形容詞性物主代詞＋動詞ing②名詞所有格＋動詞ing③代詞賓格＋動詞ing④名詞＋動詞ingHer coming to help encouraged all of us.她來幫忙鼓舞了我們所有人。The baby was made awake by the door suddenly shutting.這個嬰兒被突然的關(guān)門聲吵醒了。Can you imagine him/Jack cooking at home?你能想象他/杰克在家做飯的樣子嗎？無生命名詞無論是作主語還是作賓語都不能用第②種形式。Tom's winning first prize last year impressed me a lot.湯姆去年得了一等獎使我印象深刻。Do you mind my/me/Jack's/Jack leaving now?你介意我/杰克現(xiàn)在離開嗎？Excuse me for my not coming on time．很抱歉我沒能按時來。His father's being ill made him worried.他父親病了，他很擔(dān)心。We are looking forward to the singer's/the singer to give us a concert.我們盼望著這位歌手來給我們舉辦一場演唱會。
人教A版高中數(shù)學(xué)必修一冪函數(shù)教學(xué)設(shè)計(jì)（2）
冪函數(shù)是在繼一次函數(shù)、反比例函數(shù)、二次函數(shù)之后，又學(xué)習(xí)了單調(diào)性、最值、奇偶性的基礎(chǔ)上，借助實(shí)例，總結(jié)出冪函數(shù)的概念，再借助圖像研究冪函數(shù)的性質(zhì).課程目標(biāo)1、理解冪函數(shù)的概念，會畫冪函數(shù)y=x，y=x2，y=x3，y=x－1，y=x 的圖象；2、結(jié)合這幾個冪函數(shù)的圖象，理解冪函數(shù)圖象的變化情況和性質(zhì)；3、通過觀察、總結(jié)冪函數(shù)的性質(zhì)，培養(yǎng)學(xué)生概括抽象和識圖能力．?dāng)?shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象：用數(shù)學(xué)語言表示函數(shù)冪函數(shù)；2.邏輯推理：常見冪函數(shù)的性質(zhì)；3.數(shù)學(xué)運(yùn)算：利用冪函數(shù)的概念求參數(shù)；4.數(shù)據(jù)分析：比較冪函數(shù)大??；5.數(shù)學(xué)建模：在具體問題情境中，運(yùn)用數(shù)形結(jié)合思想，利用冪函數(shù)性質(zhì)、圖像特點(diǎn)解決實(shí)際問題。重點(diǎn)：常見冪函數(shù)的概念、圖象和性質(zhì)；難點(diǎn)：冪函數(shù)的單調(diào)性及比較兩個冪值的大?。?/p>
人教版新課標(biāo)小學(xué)數(shù)學(xué)一年級下冊平面圖形的轉(zhuǎn)換 說課稿
1.開放教材、活用教材。按照教科書和教學(xué)用書的編排意圖，本節(jié)課應(yīng)完成例1──體會平面圖形的特征（包括一個做風(fēng)車活動），例2──感知平面圖形的關(guān)系的教學(xué)內(nèi)容，課題為“圖形的拼組”。但是在實(shí)際的教學(xué)中，我們根據(jù)學(xué)生原有的認(rèn)知基礎(chǔ)和年齡特征，考慮到教學(xué)時間的限制，大膽地沖破了教材和教參的束縛，依據(jù)新理念重組了教學(xué)內(nèi)容，創(chuàng)造性地使用教材，將這一節(jié)課內(nèi)容分解為兩課時，也就是將教科書中規(guī)定選用的一頁半教材內(nèi)容，改為只用半頁教材內(nèi)容，刪去了例2──感知平面圖形的關(guān)系（拼組活動），而增加了“探究各種平面圖形之間的轉(zhuǎn)換關(guān)系”，并按“感知特征”→“探究關(guān)系”→“做風(fēng)車”這樣的順序來呈現(xiàn)教材，課題也做了相應(yīng)調(diào)整，叫“圖形的轉(zhuǎn)換”。這樣設(shè)計(jì)，是為了更好地展現(xiàn)教材內(nèi)容，力求做到開放教材、活用教材，使教材為我所用。
人教版新課標(biāo)小學(xué)數(shù)學(xué)一年級下冊平面圖形的轉(zhuǎn)換和拼組 說課稿
（二）、操作--“空間與圖形”學(xué)習(xí)的基本途徑 皮亞杰曾說：“數(shù)學(xué)的抽象仍是屬于操作性質(zhì)的，它的發(fā)生發(fā)展要經(jīng)過連續(xù)不斷的階段。而其最初的來源又是十分具體的行動?！币蛐W(xué)生的年齡特點(diǎn)和認(rèn)知規(guī)律（動作感知--建立表象--形成概念），決定小學(xué)生的數(shù)學(xué)學(xué)習(xí)離不開操作感知這一基本途徑。 本案例中，通過讓學(xué)生折一折體會長方形、正方形邊的特征；讓學(xué)生用幾個相同的長方形、三角形拼一拼，感受圖形從簡單到復(fù)雜的變化規(guī)律；最后一題讓學(xué)生自己畫一畫，看看需要幾個長方形等。教師積極創(chuàng)造條件，組織學(xué)生動手操作，以此來參與知識的形成過程，使他們在親身體驗(yàn)和探索中認(rèn)識和感悟圖形的特征，理解和掌握圖形拼組的規(guī)律所在，并發(fā)展學(xué)生的思維，提高實(shí)踐能力。如果只視學(xué)生為接受知識的容器，向?qū)W生灌輸知識，這節(jié)課幾分鐘就可以搞定，但是學(xué)生對長方形對邊相等、正方形四條邊相等，圖形拼組中的很多細(xì)節(jié)都會是干巴巴的，所學(xué)的知識必然是有“形”無“神”的死知識。
人教版新課標(biāo)小學(xué)數(shù)學(xué)六年級下冊抽屜原理說課稿3篇
【設(shè)計(jì)意圖：先讓學(xué)生觀察、猜想，然后自己想辦法“證明”自己的猜想。這樣設(shè)計(jì)，給學(xué)生自主思考的時間和空間。在獨(dú)立思考的基礎(chǔ)上，再小組合作，把動腦思考與動手操作有機(jī)結(jié)合，把獨(dú)立思考與小組合作有機(jī)結(jié)合。有利于提高探索活動的實(shí)效性。】教師巡視，參與學(xué)生的操作和討論，找出有代表性的幾種“證明”方法。3．交流討論師：差不多了吧？能解釋為什么把4個蘋果放入3個抽屜，會出現(xiàn)總有一個抽屜中至少放2個蘋果這一現(xiàn)象了嗎？【學(xué)情預(yù)設(shè)：】第一種：枚舉法請學(xué)生觀察不同的放法，能發(fā)現(xiàn)什么？引導(dǎo)學(xué)生發(fā)現(xiàn)：每一種擺放情況，都一定有一個抽屜中至少放2個蘋果。也就是說不管怎么放，總有一個抽屜中至少放2個蘋果。第二種：假設(shè)法。還有沒有用不同的方法來驗(yàn)證把4個蘋果放入3個抽屜，總有一個抽屜中至少放2個蘋果這一現(xiàn)象嗎？
【高教版】中職數(shù)學(xué)拓展模塊：1.3《正弦定理與余弦定理》教案設(shè)計(jì)
教 學(xué) 過 程教師 行為學(xué)生 行為教學(xué) 意圖 *揭示課題 1.3正弦定理與余弦定理． *創(chuàng)設(shè)情境 興趣導(dǎo)入 在實(shí)際問題中，經(jīng)常需要計(jì)算高度、長度、距離和角的大小，這類問題中有許多與三角形有關(guān)，可以歸結(jié)為解三角形問題． 介紹 播放 課件 質(zhì)疑 了解 觀看 課件 思考 學(xué)生自然的走向知識點(diǎn)*鞏固知識 典型例題 例6 一艘船以每小時36海里的速度向正北方向航行（如圖1－9）.在A處觀察到燈塔C在船的北偏東方向，小時后船行駛到B處，此時燈塔C在船的北偏東方向，求B處和燈塔C的距離（精確到0.1海里）. 圖1－9 A 解因?yàn)椤螻BC=，A=，所以.由題意知 (海里). 由正弦定理得 （海里）. 答：B處離燈塔約為海里. 例7 修筑道路需挖掘隧道，在山的兩側(cè)是隧道口A和(圖1－10），在平地上選擇適合測量的點(diǎn)C，如果，m，m，試計(jì)算隧道AB的長度（精確到m）． 圖1－10 解 在ABC中，由余弦定理知 =． 所以 m. 答：隧道AB的長度約為409m. 例8 三個力作用于一點(diǎn)O（如圖1－11）并且處于平衡狀態(tài)，已知的大小分別為100N，120N，的夾角是60°，求F的大?。ň_到1N）和方向． 圖1－11 解 由向量加法的平行四邊形法則知，向量表示F1，F(xiàn)2的合力F合，由力的平衡原理知，F(xiàn)應(yīng)在的反向延長線上，且大小與F合相等. 在△OAC中，∠OAC=180°60°=120°，OA=100， AC=OB=120，由余弦定理得 OC= = ≈191（N）. 在△AOC中，由正弦定理，得 sin∠AOC=≈0.5441， 所以∠AOC≈33°，F(xiàn)與F1間的夾角是180°–33°=147°. 答：F約為191N，F(xiàn)與F合的方向相反，且與F1的夾角約為147°． 引領(lǐng) 講解 說明 引領(lǐng) 觀察 思考 主動 求解 觀察 通過 例題 進(jìn)一 步領(lǐng) 會 注意 觀察 學(xué)生 是否 理解 知識 點(diǎn)
人教版新課標(biāo)小學(xué)數(shù)學(xué)四年級下冊小數(shù)點(diǎn)位置移動引起小數(shù)大小變化說課稿
4、實(shí)際生活中的應(yīng)用。提問學(xué)生：小數(shù)點(diǎn)位置移動引起小數(shù)大小的變化這規(guī)律在學(xué)習(xí)和生活有什么應(yīng)用？（讓學(xué)生思考在學(xué)習(xí)中，點(diǎn)錯小數(shù)點(diǎn)的位置，小數(shù)的大小就不一樣了。如果在銀行統(tǒng)計(jì)時點(diǎn)錯右漏寫小數(shù)點(diǎn)會怎樣？）教育學(xué)生做事認(rèn)真細(xì)心。（四）小結(jié)質(zhì)疑，自我評價(jià)這節(jié)課我們學(xué)習(xí)了什么？小數(shù)點(diǎn)位置移動引起小數(shù)大小的變化規(guī)律是怎樣的？質(zhì)疑：對今天的學(xué)習(xí)還有什么疑問嗎？（培養(yǎng)學(xué)生敢于質(zhì)疑，勇于創(chuàng)新的精神）評價(jià)：首先自評，學(xué)生對自己學(xué)得怎樣，用什么方法學(xué)習(xí)，印象最深的內(nèi)容是什么進(jìn)行評介。接著可以生生互評或師生互評，教師重點(diǎn)表揚(yáng)大部分學(xué)得好的同學(xué)或全班的同學(xué)，增強(qiáng)學(xué)生的自信心和榮譽(yù)感，使他們更加熱愛數(shù)學(xué)。（五）作業(yè)布置：1、回憶一遍操作探索發(fā)現(xiàn)規(guī)律的整個過程，進(jìn)一步培養(yǎng)學(xué)生良好的學(xué)習(xí)方法和習(xí)慣。2、預(yù)習(xí)97頁，例2和例3，做書上98頁練習(xí)第三題。
在與監(jiān)獄移交基地不動產(chǎn)證照儀式上的講話
**監(jiān)獄誕生于**，自1952年建立以來，始終與**和衷共濟(jì)、共同前行。60年來，**在服務(wù)**監(jiān)獄的建設(shè)發(fā)展中貢獻(xiàn)了積極力量，為**監(jiān)獄的建設(shè)和發(fā)展、職責(zé)的履行，不遺余力地提供了堅(jiān)強(qiáng)保障。作為省級現(xiàn)代化文明監(jiān)獄，在我縣的60年間，**監(jiān)獄通過自身的開拓進(jìn)取以及歷屆縣委政府的鼎力支持，發(fā)展成為集煤炭、冶金、建材、電力、機(jī)械為一體的多門類、跨行業(yè)、多產(chǎn)品的綜合性大型國有企業(yè)，高峰時期年工業(yè)總產(chǎn)值達(dá)1.3億元，上繳稅收1300余萬元，帶動就業(yè)3000余人，為我縣經(jīng)濟(jì)社會發(fā)展作出了突出貢獻(xiàn)。雖然**監(jiān)獄2012年搬遷至了**，但我們與**監(jiān)獄之間往來從未間斷，7年來，雙方多次召開座談交流會，共敘友誼之情、共謀發(fā)展大計(jì)。