【正文】 8。請你運(yùn)用所學(xué)的物理知識解釋接頭處燒斷的原因?答：電熱毯接頭處的接觸電阻很大,根據(jù)焦耳定律Q=I178。答：，起到減弱噪音的作用，水的比熱容較大，吸收或放出熱量時溫度度數(shù)變化較小，即溫差小，有恒溫作用。南寧市政府投入了大量資金，種植花草樹木，提高綠地覆蓋率，修建人工湖，擴(kuò)大水域面積，大大改善了市民的居住環(huán)境，讓全市民享受到了“綠城”帶來的實惠。，打完后摸一摸打氣筒的外壁，發(fā)現(xiàn)外壁發(fā)熱了，為什么?答：打氣時，活塞壓縮氣體做功，使氣體的內(nèi)能增大，溫度升高，通過熱傳遞也使氣筒外壁變熱。，在每年的三四月份育秧時，為了防止霜凍，傍晚常常在秧田里灌灌滿水為什么?答：由于水的比熱容大，水溫降低一定值時，會放出很多熱量，這樣就保證了環(huán)境的溫度不至于降低的太低，以防止稻苗凍傷?！八袄洌┖蠛?，你認(rèn)為這一說法有道理嗎?為什么?答：霜是空氣中的水蒸汽凝華形成的，凝華放熱，所以形成之前天氣很冷，這樣才滿足降霜的條件。答：先用大火可以將水迅速燒開，達(dá)到相對最高的溫度沸點，繼續(xù)加熱水的溫度不變，但是要保持水持續(xù)沸騰，要持續(xù)加熱，調(diào)小火，是為了維持水沸騰，讓水溫保持最高，及可以使食物熟得快，也可以節(jié)能。而那些看得到的“白氣”是水蒸氣遇冷而液化了，成了液態(tài)的小水珠，所以看得見。高溫水蒸氣遇到溫度較低的玻璃內(nèi)壁就液化成小水珠，并附在玻璃內(nèi)壁上，所以杯子的上半部模糊不清。，你會發(fā)現(xiàn)杯子的上半部模糊不清，請你用初中物理知識解釋這種現(xiàn)象。，不是很光滑。Be careful when playing in the park, and keep close to your 、遇到麻煩時應(yīng)互相幫助（相互關(guān)照）。Be careful on the way to school and back sure to look at the traffic lights when crossing the 、在湖邊玩耍時注意安全，不要單獨行動。You?re easy to have an accident if you cross the road in a 、上、下車時注意安全，不要推擠。Don?t go anywhere alone without 、吃太多的垃圾食品容易生病。Keep the park clean and 夜間不要在外逗留得太晚。On weekends, I want to take care of my grandma / go over lessons / hang out / go to movies / help my sister with her 不要亂丟垃圾。In the morning, I will do some shopping / washing / cooking / cleaning / 、下午我要做作業(yè)（做家務(wù)、做自愿者工作）。I hope everyone will have a great time / have fun / enjoy wish you a good 、我準(zhǔn)備去爬山（游泳、釣魚、劃船、騎自行車）。Be on ?t be 、自備食物和飲料。Remember to get ready for everything you need before leaving and pack 、最好帶一把雨傘（筆和筆記本）。Don?t take mustn?t talk 、乘車（步行）前往。We?ll meet at the school gate at 8 am on 、我?guī)銋⒂^中國的名勝古跡。I am friendly to am ready to help 、我對自己要求嚴(yán)格，學(xué)習(xí)勤奮。I have lots of hobbies, especially I am good at English and 、我們彼此相處融洽。I take an active part in am interested in soccer / 、我花很多時間在電視和電腦上。I want to be an artist / a scientist / a musician in the 、我喜歡看書、聊天和放風(fēng)箏。I am a student / teacher in Middle 、我是一名工廠的工人（醫(yī)院的護(hù)士）。I am a bright and lively boy / am popular with am polite to 、我15歲。I am tall and have short / long often wear a pair of 、我外向（隨和、風(fēng)趣、活躍、可愛、聰明、有創(chuàng)造力）。Don?t get stressed ?s not 、睡前散步，它有些幫助。You shouldn?t study when you?re 、你需要看醫(yī)生（牙醫(yī)）。You should also listen to music to 、你不應(yīng)該熬夜。You should also lie down and 、你應(yīng)該吃水果蔬菜并喝大量的水。You should exercise to stay 、你應(yīng)該早點上床睡覺。It?s important to sleep eight hours a 、飲食均衡是重要的。t to wait for a long , others believe that we can only see the pictures on the Internet and can not touch or see them, It is difficult to say whether it is good or will have more problems when the things are not , it is not a good news for some girls because they enjoy going shopping in the market with their ，很好用！需要的話就收走！健康、人物描寫、參觀旅游、環(huán)境和安全這五個話題經(jīng)常會出現(xiàn)在初中英語寫作的命題中，掌握這些話題句型使你在英語寫作中事半功倍哦！有一個健康的生活方式是容易的。提示詞匯：網(wǎng)上購物shopping on the Internet(online shopping)，Recently，we talk about advantages and disadvantages of shopping on the people think that it is very easy for us to go shopping shops on Internet ,for example , are open for almost 24 hours a day, so we can buy something we want at any time if we 39。參考詞匯：低碳low carbon，紙巾tissue，垃圾分類sort out rubbishes，手帕 handkerchief，電electricity注意：詞數(shù)60字左右(不含開頭和結(jié)尾所給出的字?jǐn)?shù))；可適當(dāng)增加細(xì)節(jié)了，以使行文連貫；開頭已為你寫好，不計入總詞數(shù)。m afraid(that)you may lose this friend．I believe everyone may have trouble in life and we should help each when my friends need money, we should try to help we will get it back, or maybe we won39。t need to worry too much about she will pay you back when she has just think, If you don39。中考英語八大話題作文，滿分必備！Sample 1 ： My hobbies 個人愛好I have a lot of hobbies as same as others, for example: I like making friends and doing exercises as well as learning English, and so think my hobbies are important not only for my study but also my making friends, we can know more people and groups outside world, just like a song says that “ you will walk more smoothly if you have more friends”.Everyone knows that doing exercises is good for our health, and keep ourselves young and healthy, it will make us successful in our English is a good hobby as well, we could make more foreign friends and learn western cultures, it will open our minds in the ing am glad that I have such good hobbies, I will keep this 2 ： My best friend 最好的朋友Maybe you would like to ask me “who is your best friend?” I can tell you the answer is used to be hardworking and interested in every subject we learn at is good at Chinese and is friendly and he makes many foreign he gets on well with this classmates and likes dancing , and drawing as work has won prizes for several help each other not only in the study but also in our is possible that we are going to different schools in a few months , wherever we go, I believe/am sure Jack will be my best friend 3 ：Advice on following traffic rules 遵守交通規(guī)則It is very important for us to know about the traffic knows that red light means ?stop? and you are not allowed to can walk across the road safely when green light is more thing is yellow people always forget when the green light off, yellow light will be on, please be careful because red light will be on in a few you must wait for a while are some useful suggestions for following traffic , we should follow the traffic lights and cannot break the traffic , we had better remember the principle “slowly, look left and right side, go across finally”.Last but not least,(最后一條也是最重要的一條)do not forget that it is rather dangerous to play on the everybody follows the traffic rules we will have a happy life in the 4：A letter on lending money 英文書信(借錢)Hi！Alice ，I39?！痹偃纭逗竦廊恕返拈_頭：“厚道人，是待人誠懇，做事誠實，能寬容，不刻薄之人。這里的定義要新鮮，有獨到之處。下定義式開頭這種技法開頭就對某種現(xiàn)象、思想、事物等下一個有個性的定義，把自己的看法先聲奪人的表達(dá)出來。”又如《精彩的夜晚》的開頭：“在鄉(xiāng)村，最美的不是黎明，也不是盛夏的樹陰，而是那美麗的夜晚?？磿?9。玩39。它的優(yōu)點是入題快捷，不蔓不枝，利于讀者把握文章中心、《生活中的一個好習(xí)慣》的開頭：“我生活中有一個習(xí)慣，媽媽說這個習(xí)慣好?！边@二篇作文的開頭都是以比喻開始，給讀者活潑靈動、簡潔明了的感覺。雖然我談到的只是很膚淺的一小部分而已?！痹偃纭蹲x父親》的開頭：“父親是一本飽含哲理的書，在書頁間流露著偉岸、正直，每一字每一句都教給我做人的道理。如《學(xué)習(xí)貴在創(chuàng)新》的開頭：“創(chuàng)新，是學(xué)習(xí)的生命力?？梢允刮恼律鷦踊顫姟⒑啙嵜骺?，把抽象的問題具體化，把深奧的道理淺顯化。這種形式和以描寫開頭有相似之處，有時候可以二者結(jié)合起來用，這樣能收到更好的表達(dá)效果。本文開始就把鏡頭對準(zhǔn)絢麗的舞臺和迷人的月光，用以渲染一種焦急的氣氛。如《一次難忘的實踐》的開頭：酒紅色的幕布拉開了，色彩繽紛的旋轉(zhuǎn)舞臺上，燈光閃耀。那段歲月是美妙的文章表達(dá)出對初