第一篇：專業(yè)英語演講稿

feet, the carriers of life

good morning, ladies and gentlemen.i would like to tell you about an unusual assignment.i was surprised and amused when our teacher told us our homework was to wash our feet carefully.yeah, washing the feet is such a common daily activity that i’ve never paid much attention to it.my feet had been cooperating and helping each other, nearly always managing to get washed, while i was enjoying my readings.but that night, while i gently touched my feet in the hot water, i realized how nice and cozy bathing my feet could be.deep in my mind, the hands always seemed superior to the feet.people use all sorts of things from soap to moisture cream to protect their hands.the feet become, kind of, neglected, since the feet spend all day long with the ground and dirt, and quite inevitably, get really smelly.as i slowly soaped and rinsed my feet, i was beginning to understand why my teacher launched such a mission.she wanted us to realize that the feet were more helpful than we had ever imagined.surely, the hands are important.however it’s the feet that carry your whole body weight, and everything about your life.the feet carry you, as well as your hopes and dreams, and walk steadily upon the most solid ground, moving forward step by step, upon mountains and down valleys, over the smooth as well as the rough, through the bitterness as well as the joy.as i was washing my feet, i let my mind wander.i felt as if i was on a vast desert.looking around, i saw millions of footprints, large and small, deep and shallow, being the marks of existence, and the traces of life.and there i was, using my own feet, making my own path, towards the oasis of life……

thank you.腳，生命的載體

女士們，先生們，上午好!

我想告訴大家一份不尋常的家庭作業(yè)，老師布置我們當(dāng)晚回家認(rèn)真給自己洗一遍腳，聽到后，我感到驚奇而有趣。

是啊，腳，我每晚必洗，但從未重視過。洗腳時，我津津有味地看著書，任雙腳摩挲，互幫互助。但今晚，當(dāng)我的雙手觸摸到自己的雙腳時，是多么的舒服、愜意啊!

心中，總是覺得手比腳高貴，人們用香皂洗手，并抹上護手霜，百般呵護;而腳踩在地上，即使有鞋襪，也總被認(rèn)為是與灰土打交道的粗笨一族，并有不可避免的異味，腳，似乎成了身體中被忽視的部分。

我仔細(xì)地洗著腳，漸漸地，我明白了老師的用意：她布置這個特殊的任務(wù)，是為了讓我們認(rèn)識到腳，其實比我們想象的更偉大。

無可爭議，手固然重要。可腳卻承擔(dān)著你生命的全部重量。

腳，負(fù)著你，你沉甸甸的希望和夢想，踩著踏實的大地，一步一步地前進(jìn)，走上了高山也走下了峽谷，走過了平坦也走過了崎嶇，走過了苦難也走過了幸福。

我在洗腳，手腳依偎，恍惚間，我仿佛置身于廣袤的大漠中。環(huán)視四周，一串串大大小小深深淺淺的腳印，這是存在的證明，生命的印跡。而我用自己的雙腳，開辟著自己的道路，向生命的綠洲前進(jìn)……

謝謝!

第二篇：專業(yè)英語演講稿

feet, the carriers of life

good morning, ladies and gentlemen.i would like to tell you about an unusual assignment.i was surprised and amused when our teacher told us our homework was to wash our feet carefully.yeah, washing the feet is such a common daily activity that i’ve never paid much attention to it.my feet had been cooperating and helping each other, nearly always managing to get washed, while i was enjoying my readings.but that night, while i gently touched my feet in the hot water, i realized how nice and cozy bathing my feet could be.deep in my mind, the hands always seemed superior to the feet.people use all sorts of things from soap to moisture cream to protect their hands.the feet become, kind of, neglected, since the feet spend all day long with the ground and dirt, and quite inevitably, get really smelly.as i slowly soaped and rinsed my feet, i was beginning to understand why my teacher launched such a mission.she wanted us to realize that the feet were more helpful than we had ever imagined.

www.tmdps.cn【xiexiebang.com范文網(wǎng)】

surely, the hands are important.however it’s the feet that carry your whole body weight, and everything about your life.the feet carry you, as well as your hopes and dreams, and walk steadily upon the most solid ground, moving forward step by step, upon mountains and down valleys, over the smooth as well as the rough, through the bitterness as well as the joy.as i was washing my feet, i let my mind wander.i felt as if i was on a vast desert.looking around, i saw millions of footprints, large and small, deep and shallow, being the marks of existence, and the traces of life.and there i was, using my own feet, making my own path, towards the oasis of life……

thank you.腳，生命的載體

女士們，先生們，上午好!

我想告訴大家一份不尋常的家庭作業(yè)，老師布置我們當(dāng)晚回家認(rèn)真給自己洗一遍腳，聽到后，我感到驚奇而有趣。

是啊，腳，我每晚必洗，但從未重視過。洗腳時，我津津有味地看著書，任雙腳摩挲，互幫互助。但今晚，當(dāng)我的雙手觸摸到自己的雙腳時，是多么的舒服、愜意啊!

心中，總是覺得手比腳高貴，人們用香皂洗手，并抹上護手霜，百般呵護;而腳踩在地上，即使有鞋襪，也總被認(rèn)為是與灰土打交道的粗笨一族，并有不可避免的異味，腳，似乎成了身體中被忽視的部分。

我仔細(xì)地洗著腳，漸漸地，我明白了老師的用意：她布置這個特殊的任務(wù)，是為了讓我們認(rèn)識到腳，其實比我們想象的更偉大。

無可爭議，手固然重要。可腳卻承擔(dān)著你生命的全部重量。

腳，負(fù)著你，你沉甸甸的希望和夢想，踩著踏實的大地，一步一步地前進(jìn)，走上了高山也走下了峽谷，走過了平坦也走過了崎嶇，走過了苦難也走過了幸福。

第三篇：專業(yè)英語演講稿

英國教育體制簡介

ladies and gentlemen: today i want to talk something about british education system.英國是一個有悠久教育傳統(tǒng)的國家。它的教育體系經(jīng)過幾百年的沿革，相當(dāng)?shù)耐晟坪蛷?fù)雜，且具有非常大的靈活性。可大致分為四個部分：學(xué)齡前教育、學(xué)校教育（義務(wù)教育）、延續(xù)教育、高等教育。第一部分：學(xué)齡前教育，即幼兒園教育。一般是為5歲以下的兒童開設(shè)的，沒有具體的教學(xué)，目的是使他們在讀小學(xué)時更能適應(yīng)學(xué)校生活。

第二部分：義務(wù)教育.1-6年級為一個檔次，其實就是幼兒園的等級，所以并沒有具體的教學(xué)。7-9年級為一個檔次。與我國小學(xué)類似，開始學(xué)習(xí)所有科目，但并不非常注重學(xué)習(xí)成績，算是一種開導(dǎo)式教育以培養(yǎng)興趣，故基礎(chǔ)教育扎實度與國內(nèi)不可相比。10-11年級被稱為gcse,類似我國的初中。此時已經(jīng)開始注重學(xué)生自己的興趣培養(yǎng)，除了語文（英語），數(shù)學(xué)，外語（法語）之外，必修的為物理、生物、化學(xué)、電腦、體育。其他按照自己興趣，選修三門科目。其范圍非常廣泛，美術(shù)、音樂、地理、拉丁、德語、體育理論、商業(yè)、經(jīng)濟等。所以學(xué)生可以不用為自己之前所不擅長的課再擔(dān)心了。gcse在英國也稱第四級和第五級，中國學(xué)生進(jìn)入該課程的年齡為14-15歲，此為兩年的一貫課程科，在上gcse可趁第二年的五月份時會有一次英國gcse課程國家大會考。英國學(xué)生完成gcse離開學(xué)校后可直接進(jìn)入就業(yè)市場，想升大學(xué)者就會繼續(xù)修讀第六級的a-level課程。

第三部分：延續(xù)教育。16歲到大學(xué)前的教育。這是英國教育體系中最有特色也最精彩的部分，它是繼小學(xué)中學(xué)教育之后的第三級教育。為進(jìn)入高等教育或者就業(yè)打下基礎(chǔ)。它分為兩種體系：學(xué)業(yè)路線和職業(yè)路線。學(xué)業(yè)路線著重于培養(yǎng)學(xué)術(shù)研究方面的人才，職業(yè)路線則結(jié)合社會各層面的職業(yè)需要，培養(yǎng)在各種行業(yè)中具有專門技能知識的人才。

1、學(xué)業(yè)路線。a-level的全稱是“普通教育高級證書”，是學(xué)業(yè)路線的重要階段，學(xué)制一般為兩年。它總共有100多個科目，專業(yè)分科極為細(xì)致，它不像我國學(xué)生在高中學(xué)習(xí)的課程。而更像是大學(xué)的基礎(chǔ)課，相當(dāng)于中國大學(xué)本科課程的首兩年。as-level是a-level課程的一個特別組成部分，一門as-level科目在內(nèi)容和分量上相當(dāng)于一門a-level科目的一半，深度和難度上與a-level相當(dāng)。a-level課程的學(xué)生第一年都將從as-level科目開始學(xué)習(xí)，所有學(xué)生必須選修四門以上不同的as-level科目。而在第二年再確定只選三門a-level科目。

2、職業(yè)路線。英國的職業(yè)教育可謂豐富多彩，從美容師到平面美術(shù)設(shè)計師、從嬰兒護理到飛機維修師應(yīng)有盡有。英國的職業(yè)教育與學(xué)業(yè)路線有一定的對應(yīng)性，學(xué)生可以根據(jù)自己的學(xué)業(yè)情況選擇進(jìn)入學(xué)業(yè)路線的不同階段。這種方式給學(xué)生提供了更多的選擇機會，使不同類型的學(xué)生能夠充分發(fā)揮自己的優(yōu)勢和潛能。gnvq國家通用職業(yè)文憑。它是一種廣泛的職業(yè)教育課程，與學(xué)業(yè)路線中的gcse和a-level相平行，但在學(xué)業(yè)深度和難度上并不亞于這類課程。它的學(xué)習(xí)的方式靈活多樣，學(xué)生可以根據(jù)自己的需要和興趣愛好安排課程，選擇學(xué)分制或模塊式的學(xué)習(xí)方式，甚至可以在學(xué)習(xí)的過程中穿插工作，在學(xué)習(xí)和工作同時進(jìn)行的過程中最終選擇自己最喜歡的事業(yè)。gnvq的選科比較簡單，每門課程就是一個專業(yè)，所有受到許多英國學(xué)生和中國留學(xué)生的青睞。

第四部分：高等教育。顧名思義，高等教育是英國教育體系中的高級階段，它包括: 本科(bachelor degree)英國本科學(xué)士學(xué)位學(xué)制一般為三年，但有些大學(xué)的某些特殊專業(yè)要求讀四年或以上，如牙科。在英國人眼中，醫(yī)科和法律專業(yè)是最難考取也是最難讀的專業(yè)。因為這兩種學(xué)科的共同點是“人命關(guān)天”。研究生(master degree)英國的研究生課程只需要一年時間，這與中國和美國都不同。在這一年里學(xué)生主要是寫論文和做課題研究，課堂教學(xué)較少，因此其他國家的留學(xué)生如果沒有在英國經(jīng)過一段時間的學(xué)習(xí)或語言不過關(guān)，是很難完成這一年課程的。高級國家文憑(hnd-higher national diploma)。hnd也是一種非常有用的文憑。它是職業(yè)教育體系中的最高階段，學(xué)制一般為兩年。hnd理論上相當(dāng)于中國的大專文憑，但分類更細(xì)，專業(yè)性更強。進(jìn)入hnd要求已經(jīng)完成a-level或者gnvq-advanced的課程，中國的高中學(xué)生如果在某些方面（比如計算機）有特殊專長并且表現(xiàn)出相當(dāng)好的語言能力的話，也有可能直接進(jìn)入hnd，但讀起來會相當(dāng)辛苦。hnd畢業(yè)后，如果取得比較好的成績，可以選擇直接進(jìn)入本科第三年的課程，通常是本校或聯(lián)校的相應(yīng)專業(yè)。也就是說，再加一年就可以取得學(xué)士學(xué)位。但英國最好的大學(xué)一般不接受此類學(xué)生。

大學(xué)每學(xué)年分為了3學(xué)期。第一學(xué)期為9月中至圣誕節(jié)（約12月中）；第二學(xué)期為1月中至萬圣節(jié)（約4月中）；第三學(xué)期為5月初。教學(xué)段是第一和第二學(xué)期，第三學(xué)期屬于考試。ucas 是大學(xué)院校入學(xué)委員會，為想至英國修讀大學(xué)課程的學(xué)生提供申請入學(xué)服務(wù)。對336所大學(xué)院校之申請，皆必須通過ucas，學(xué)生并不能自己向?qū)W校直接申請。ucas有一點類似中國的大學(xué)高考，兩者最大的不同是高考需要經(jīng)由聯(lián)考，而ucas只是申請。經(jīng)由ucas需填寫一份申請表(ucas form)，表格內(nèi)可填寫6個大學(xué)，亦即最多可同時向六所大學(xué)提出申請，也可以只申請一所大學(xué)。ucas form上六所大學(xué)排列的順序不是學(xué)生選擇的優(yōu)先級，優(yōu)先次序是在學(xué)生收到大學(xué)的offer letter后自行決定。篇二：專業(yè)英語演講稿 part 1 the introduction of rose garden for centuries, there are many fairy tale about rose or take place in the rose garden, such as[the nightingale and the rose],you must heard of it, the nightingale made a red rose for the young man with her own blood with singing all night, it’s a sad story.what’s more, the story[wild swan],at the end of the story, princess sat on the rose blush with her swan brothers, what a romantic picture.today, as far as i am concerned, many girls must have a dream of having a wedding with plenty of roses, or being a beautiful bride like a fresh rose, what’s more, living in a rose garden with the beloved one and so on.in a conclusion, rose is a symbol of beauty and love, it express the best wish of having a romantic life and the emotion.here is a brief introduction of rose, it is a woody perennial of the genus rosa.there are more than 100 species in the world, gardeners plant them to build a rose garden.so now, i’ll leave the stage to my partner cai jun, she will tell us something about instance analysis.part 2 instance analysis ok this part, i will give an example to discuss the rose garden.first, it’s a brief introduction about qinghai rose garden it is part of low density and top housing estate, with large space occupation, simple style of england in qinghai.meanwhile, rose garden has high collectable, attract the crows admire and form a senic spot.in addition drive more and more people purchase it, promote the local economic growth.however, everything has two sides.rose garden not only increase the project costing unintentionally, but also has high requirements of the geographical conditions.and high price to limit consumers.that’s all what i want to say.part 3 the layout of rose garden the layout of rose garden contains four parts: pergola, lattice well, flowers hedge and others.(i draw some pictures to help us to understand it.)pergola: first, plant rose from both sides of pergola;then, lead the branch grows with it.lattice well: this is the iron wire.iron wire is utilized to make reticulation.the green stems could be coiled around the iron wire.lattice well will be done about three years.flowers hedge: there is a same way as the pergola to make a hedge.others: you can also use roses to make some animal shapes.such as: rabbit, hippocampus?? the rose garden is done after collocate with garden lights, furniture, lattice well, flower hedge, pergola and awning.you can have a barbecue in the rose garden with friends.part 4 the most popular rose good evening, everyone, tonight id like to say something about the most popular rose.as we all known ,there are many kinds of roses, the red rose, blue rose, white rose, green roses and purple rose, black rose, yellow rose, rainbow rose.now, lets take a look some the most popular roses.look at the picture ,it called blue enchantress.we can rarely see a natural blue rose, when a white rose quickly to the flowering, watering it with dyes, because absorbs the dyes, and finally it turned blue blue enchantress means pure love and sincere love.this is roasted rose, roasted rose can adaptation for climate to grow in many country, it can be widely used in rose’s deep processing.it’s a rare superior varieties of agricultural then, champagne roses: champagne roses is the national flower of bulgaria.some people say wishing on a champagne roses can be achieved, so it called happy flower.corolla: corolla rose is the patent product of the united states, belong to the top varieties of red roses bulgaria rose: part 5 other five popular rose.blue moon, sweet pretty, alba meialandina, horatio nelson and sun sprinkles are also very popular among people.blue line rose have a fresh color like lavender, charming and make your feel romantic.it is popular in northern city and easily survival.sweet pretty it has a little of petals but has a number of flowers and like the butterflies dancing on the green leaves.you can see the stamen very clearly and the twigs are soft.alba meialandina the white color looks simple but elegant.it can serve as the potted plant and bedding plant.horatio nelson it cultivates from england.both cold-consistence and disease-consistence are very good.it can use to decorate the wood-fence and act as the cut flower.sun sprinkles these flowers have thin petals, but have long flowering phase.the color of flowers like the sunlight, let us feel warm.people often use to decorate the arch.the most popular rose part 6 today i will introduce five methods of growing roses;seedling、cuttage、grafting、marcottage and root division.cuttage twig cottage: choose the sprout buds in early spring, disbranch few xylom from stem, deal with growth hormone then insert nursery beds.stiff wood cottage: cut the substantial branch overwintering place in low temperature romm and insert upside down wet sand.next spring transplant to nursery beds.stiff wood hygroscopic: choose the branch with one or two leaves, cut the bottom, stick in the water, put it in 15℃—20℃ with sunshine, it can promote proliferate.grafting include budding、branch grafting and root grafting.there are two ways to marcottage, one is on the ground, the other one in the air.during the rose growing time, carve branch, curve it cover wet soil, when the wound outgrow new root, cut down and transplant.the second method we can choose a suitable position on train rose carve branch or peel off the skin.put a packet of soil around it about a month, cut down when it have root.the last one is root division.plant the roses deeply, urge branch grow root, cut the new root with the lateral branch to get a new one.here are the five kinds of planting roses, thank you for your attention.part 7 how to control diseases and insect pests there are often two kinds of diseases infect rose, powdery mildew and downy mildew.the powdery mildew often appears in new leaves in early spring and late autumn.it’s a kind of spore flow with the air.spraying water frequently can prevent the disease.and the infected leaves must be cut immediately once the rose was ill.the downy mildew will hurt the leaves, petals, shoots, pedicels.the humidity should be controlled under 85% to prevent downy mildew and don’t use too much nitrogenous fertilizer to prevent the disease.and there are two kinds of insect pests often hurt rose, aphid and red spider.aphid can appear in any time during a year.it will be threaten when weather is dry.pesticide should be sprayed in the growing point and back of leaves to control the pest.red spider will suck up chlorophyll of leaves.and pesticide should be sprayed at the early stage of the illness.篇三：專業(yè)英語演講稿 introduction [?s?:kit]utilizing [?ju:tilaiz] operational amplifiers.運算放大器是一個非常有效和通用設(shè)備。它的應(yīng)用范圍廣泛的電子工業(yè)，信號調(diào)理，專項轉(zhuǎn)移功能，模擬儀表，模擬計算，及特殊系統(tǒng)設(shè)計的灌裝要求。簡單性和精確度是使用運算放大器的模擬電路特點 the feedback technique the precision and flexibility of the operational amplifier is a direct result of the use of negative feedback.generally speaking, amplifiers employing feedback will have superior operating characteristics at a sacrifice [?s?krifais]of gain.在運算放大器的精度和靈活性是利用負(fù)反饋的直接結(jié)果。一般來說，采用反饋的放大器有卓越的經(jīng)營特點，在犧牲增益的代價下。

有了足夠的反饋，閉環(huán)放大器的特點成為一個功能的反饋元件。在典型的反饋電路中，圖1中，反饋元件是兩個電阻器。的精度的“閉環(huán)”的增益設(shè)置的兩個電阻的比率實際上是獨立的“開環(huán)”放大器。因此，放大到幾乎任何的精確度，可以容易地實現(xiàn)。notation符號 ?= symbol(a)is a buffer [?b?f?] 緩沖器 op工作 amp放大器 ?= symbol(c)is a differential input, differential output op amp.the outputs can be thought of as “inverting” [in?v?:t] 反轉(zhuǎn)and “non-inverting”, and are shown across from [k?m?pli:??n] 完成of feedback loops on schematics [ski:?m?t?k].符號（a）是一個緩沖器的運算放大器 ?=符號（b）是一個差分輸入，單端輸出的運算放大器。這個符號代表最常見的類型，包括電壓反饋和電流反饋運算放大器。它通常是在頂部和在底部的倒相輸入端與非反相輸入描繪的時間。?=符號（c）是差分輸入，差分輸出運算放大器。輸出可以被認(rèn)為是“反轉(zhuǎn)”和“非反相”，并示出從相反的極性的輸入對面容易完成的反饋回路原理圖 power connections電源連接 power is supplied to each of these units at connections as shown in figure 4.such a connection is implied in all operational amplifier circuits.the dual [?dju:?l]兩部分

電源供給到這些單元中的每一個，如在圖4中所示的連接。這樣的連接是隱含在所有的運算放大器電路。雙電源呈現(xiàn)相同的絕對電壓值從任一側(cè)接地，而中心連接最終定義的公共線和接地電位。例外情況是可以使用單個電源的ac放大器電路。這是通過創(chuàng)建一個浮動的ac地面的隔直流電容器。在這種電路中，“半電源”的來源創(chuàng)建一個“虛擬地”正好有一半之間的正電源和接地電位的方法。electrical circuit models電氣電路模型 the simplified models of the differential [?d?f??ren??l] 差分input operational amplifiers are shown in figures 6 and 7.在圖6和圖7中示出的差分輸入運算放大器的簡化模型。as indicated in figure 6, the operational amplifier can be represented by an ideal voltage source whose value depends on the input voltage appearing across the inverting and non-inverting inputs plus the effects of finite [?fainait] 有限input and output impedances [im?pi:d?ns]阻抗.the value, a, is known as the open loop(without feedback)gain of the operational amplifier.正如在圖6中所示，運算放大器可以表示為一個理想電壓源，其值取決于對輸入電壓的兩端出現(xiàn)的反相和非反相輸入端加上有限的輸入和輸出阻抗的影響。值，a，是被稱為在運算放大器的開環(huán)增益（沒有反饋）。the simplified model of the differential output operational amplifier(figure 7)is an accurate [??kjurit] approximation [??pr?ks??me???n]近似值only under special conditions of feedback(see “balanced amplifier” later in this handbook).figure 6 represents the model of the differential output type when it is used as a single ended output device;the inverting output simply being ignored.簡化模型的差分輸出運算放大器（圖7）是一個準(zhǔn)確近似，僅在特殊條件下的反饋（見“平衡放大器”，在本手冊后面）。圖6表示的差分輸出的模型類型時，它被用作一個單端輸出的移動設(shè)備簡單地被忽略的反相輸出。the ideal operational amplifier理想運算放大器 in order to introduce operational amplifier circuitry, we will use an ideal model of the operational amplifier to simplify the mathematics [?m?θi?m?tiks] involved in deriving gain expressions, etc., for the circuits presented.with this understanding as a basis, it will be convenient to describe the properties of the real devices themselves in later sections, and finally to investigate circuits utilizing practical operational amplifiers.為了介紹運算放大器電路中，我們將使用一個理想的模型簡化中獲得的電路增益表達(dá)式等，所涉及的數(shù)學(xué)運算放大器的。有了這樣的認(rèn)識，以此為基礎(chǔ)，可以方便的真實設(shè)備本身在后面的章節(jié)中描述的屬性，最后調(diào)查利用實際的運算放大器電路。to begin the presentation of operational amplifier circuitry [?s?:kitri], then, it is necessary first of all to define the properties of a mythical “perfect” operational amplifier.the model of an ideal operational amplifier is shown in figure 9.首先介紹運算放大器電路，那么，它是必要的，首先要定義一個神話般的“完美”的運算放大器的性能。理想的運算放大器的模型是在圖9中所示。defining the ideal operational amplifier ?= gain: the primary function of an amplifier is to amplify, so the more gain the better.it can always be reduced with external circuitry, so we assume gain to be infinite [?infinit]無限.增益：放大器的主要功能是放大的，所以更多的獲得更好。它總是可以減少與外部電路，所以我們假設(shè)增益是無限 ?= input impedance: input impedance is assumed to be infinite.this is so the driving source won’t be affected by power being drawn by the ideal operational amplifier.輸入阻抗：輸入阻抗被認(rèn)為是無限的。這是這樣的驅(qū)動源將不會受到影響被繪制了理想的運算放大器的功率。?= output impedance: the output impedance of the ideal operational amplifier is assumed to be zero.it then can supply as much current as necessary to the load being driven.輸出阻抗：理想的運算放大器的輸出阻抗被假定為零。然后，它可以提供盡可能多的電流所必需的被驅(qū)動的負(fù)載。?= response time: the output must occur at the same time as the inverting input so the response time is assumed to be zero.phase shift will be 180?.frequency response will be flat and bandwidth infinite because ac will be simply a rapidly varying dc level to the ideal amplifier.響應(yīng)時間：輸出必須在相同的時間發(fā)生的反相輸入端，這樣的響應(yīng)時間被假定為零。相移為180?。頻率響應(yīng)是平的，無限的，因為交流會只是一個快速變化的dc電平的理想放大器的帶寬。

?= offset: the amplifier output will be zero when a zero signal appears between the inverting and non-inverting inputs.偏移量：當(dāng)一個零信號之間出現(xiàn)的反相和非反相輸入端，放大器的輸出將為零。circuits and analyses using the ideal operational amplifier用理想運算放大器的電路及分析

the desirability of feedback是可取的反饋 consider the open loop amplifier used in the circuit of figure 10.note that no current flows from the source into the inverting inputhence, there is no voltage drop across rs and es appears across the amplifier input.when es is zero, the output is zero.if es takes on any non-zero value, the output voltage increases to saturation [?s?t???re???n] 飽和, and the amplifier acts as a switch.考慮圖10的電路中使用的開環(huán)放大器。請注意，從源代碼編譯成的反相輸入端因此沒有電流流過，有沒有rs兩端的電壓降和es出現(xiàn)整個放大器的輸入。當(dāng)es是零，其輸出為零。如果es承擔(dān)任何非零的值，輸出電壓增大到飽和，該放大器作為一個開關(guān)。the open loop amplifier is not practical一旦一個運算放大器推到飽和，它的行為是不可預(yù)測的。未指定恢復(fù)時間從飽和運算放大器的（除了電壓限制類型）。它可能無法收回;輸出鎖存。作為輸出級試圖把車開到一個或其他鐵路的一些運算放大器，尤其是軌到軌車型，可能會吸引大量的電流輸出結(jié)構(gòu)。對于運算放大器開環(huán)運行的詳細(xì)信息，請參閱參考文獻(xiàn)1。two important feedback circuits篇四：專業(yè)英語演講稿范文

專業(yè)英語演講稿范文

feet, the carriers of life good morning, ladies and gentlemen.i would like to tell you about an unusual assignment.i was surprised and amused when our teacher told us our homework was to wash our feet carefully.as i slowly soaped and rinsed my feet, i was beginning to understand why my teacher launched such a mission.she wanted us to realize that the feet were more helpful than we had ever imagined.surely, the hands are important.however it’s the feet that carry your whole body weight, and everything about your life.the feet carry you, as well as your hopes and dreams, and walk steadily upon the most solid ground, moving forward step by step, upon mountains and down valleys, over the smooth as well as the rough, through the bitterness as well as the joy.as i was washing my feet, i let my mind wander.i felt as if i was on a vast desert.looking around, i saw millions of footprints, large and small, deep and shallow, being the marks of existence, and the traces of life.and there i was, using my own feet, making my own path, towards the oasis of life?? thank you.腳，生命的載體

女士們，先生們，上午好!我想告訴大家一份不尋常的家庭作業(yè)，老師布置我們當(dāng)晚回家認(rèn)真給自己洗一遍腳，聽到后，我感到驚奇而有趣。

是啊，腳，我每晚必洗，但從未重視過。洗腳時，我津津有味地看著書，任雙腳摩挲，互幫互助。但今晚，當(dāng)我的雙手觸摸到自己的雙腳時，是多么的舒服、愜意啊!心中，總是覺得手比腳高貴，人們用香皂洗手，并抹上護手霜，百般呵護;而腳踩在地上，即使有鞋襪，也總被認(rèn)為是與灰土打交道的粗笨一族，并有不可避免的異味，腳，似乎成了身體中被忽視的部分。

我仔細(xì)地洗著腳，漸漸地，我明白了老師的用意：她布置這個特殊的任務(wù)，是為了讓我們認(rèn)識到腳，其實比我們想象的更偉大。

無可爭議，手固然重要。可腳卻承擔(dān)著你生命的全部重量。

腳，負(fù)著你，你沉甸甸的希望和夢想，踩著踏實的大地，一步一步地前進(jìn)，走上了高山也走下了峽谷，走過了平坦也走過了崎嶇，走過了苦難也走過了幸福。

我在洗腳，手腳依偎，恍惚間，我仿佛置身于廣袤的大漠中。環(huán)視四周，一串串大大小小深深淺淺的腳印，這是存在的證明，生命的印跡。

第四篇：專業(yè)英語演講稿

feet, the carriers of life

good morning, ladies and gentlemen.i would like to tell you about an unusual assignment.i was surprised and amused when our teacher told us our homework was to wash our feet carefully.yeah, washing the feet is such a common daily activity that i’ve never paid much attention to it.my feet had been cooperating and helping each other, nearly always managing to get washed, while i was enjoying my readings.but that night, while i gently touched my feet in the hot water, i realized how nice and cozy bathing my feet could be.deep in my mind, the hands always seemed superior to the feet.people use all sorts of things from soap to moisture cream to protect their hands.the feet become, kind of, neglected, since the feet spend all day long with the ground and dirt, and quite inevitably, get really smelly.as i slowly soaped and rinsed my feet, i was beginning to understand why my teacher launched such a mission.she wanted us to realize that the feet were more helpful than we had ever imagined.surely, the hands are important.however it’s the feet that carry your whole body weight, and everything about your life.the feet carry you, as well as your hopes and dreams, and walk steadily upon the most solid ground, moving forward step by step, upon mountains and down valleys, over the smooth as well as the rough, through the bitterness as well as the joy.as i was washing my feet, i let my mind wander.i felt as if i was on a vast desert.looking around, i saw millions of footprints, large and small, deep and shallow, being the marks of existence, and the traces of life.and there i was, using my own feet, making my own path, towards the oasis of life……

thank you.

第五篇：專業(yè)英語演講稿

英國教育體制簡介

Ladies and Gentlemen:

Today I want to talk something about British education system.英國是一個有悠久教育傳統(tǒng)的國家。它的教育體系經(jīng)過幾百年的沿革，相當(dāng)?shù)耐晟坪蛷?fù)雜，且具有非常大的靈活性。可大致分為四個部分：學(xué)齡前教育、學(xué)校教育（義務(wù)教育）、延續(xù)教育、高等教育。

第一部分：學(xué)齡前教育，即幼兒園教育。一般是為5歲以下的兒童開設(shè)的，沒有具體的教學(xué)，目的是使他們在讀小學(xué)時更能適應(yīng)學(xué)校生活。

第二部分：義務(wù)教育.1-6年級為一個檔次，其實就是幼兒園的等級，所以并沒有具體的教學(xué)。

7-9年級為一個檔次。與我國小學(xué)類似，開始學(xué)習(xí)所有科目，但并不非常注重學(xué)習(xí)成績，算是一種開導(dǎo)式教育以培養(yǎng)興趣，故基礎(chǔ)教育扎實度與國內(nèi)不可相比。

10-11年級被稱為GCSE,類似我國的初中。此時已經(jīng)開始注重學(xué)生自己的興趣培養(yǎng)，除了語文（英語），數(shù)學(xué)，外語（法語）之外，必修的為物理、生物、化學(xué)、電腦、體育。其他按照自己興趣，選修三門科目。其范圍非常廣泛，美術(shù)、音樂、地理、拉丁、德語、體育理論、商業(yè)、經(jīng)濟等。所以學(xué)生可以不用為自己之前所不擅長的課再擔(dān)心了。GCSE在英國也稱第四級和第五級，中國學(xué)生進(jìn)入該課程的年齡為14-15歲，此為兩年的一貫課程科，在上GCSE可趁第二年的五月份時會有一次英國GCSE課程國家大會考。英國學(xué)生完成GCSE離開學(xué)校后可直接進(jìn)入就業(yè)市場，想升大學(xué)者就會繼續(xù)修讀第六級的A-level課程。

第三部分：延續(xù)教育。16歲到大學(xué)前的教育。這是英國教育體系中最有特色也最精彩的部分，它是繼小學(xué)中學(xué)教育之后的第三級教育。為進(jìn)入高等教育或者就業(yè)打下基礎(chǔ)。它分為兩種體系：學(xué)業(yè)路線和職業(yè)路線。學(xué)業(yè)路線著重于培養(yǎng)學(xué)術(shù)研究方面的人才，職業(yè)路線則結(jié)合社會各層面的職業(yè)需要，培養(yǎng)在各種行業(yè)中具有專門技能知識的人才。

1、學(xué)業(yè)路線。A-level的全稱是“普通教育高級證書”，是學(xué)業(yè)路線的重要階段，學(xué)制一般為兩年。它總共有100多個科目，專業(yè)分科極為細(xì)致，它不像我國學(xué)生在高中學(xué)習(xí)的課程。而更像是大學(xué)的基礎(chǔ)課，相當(dāng)于中國大學(xué)本科課程的首兩年。

AS-level是A-level課程的一個特別組成部分，一門AS-level科目在內(nèi)容和分量上相當(dāng)于一門A-level科目的一半，深度和難度上與A-level相當(dāng)。A-level課程的學(xué)生第一年都將從AS-level科目開始學(xué)習(xí)，所有學(xué)生必須選修四門以上不同的AS-level科目。而在第二年再確定只選三門A-level科目。

2、職業(yè)路線。英國的職業(yè)教育可謂豐富多彩，從美容師到平面美術(shù)設(shè)計師、從嬰兒護理到飛機維修師應(yīng)有盡有。英國的職業(yè)教育與學(xué)業(yè)路線有一定的對應(yīng)性，學(xué)生可以根據(jù)自己的學(xué)業(yè)情況選擇進(jìn)入學(xué)業(yè)路線的不同階段。這種方式給學(xué)生提供了更多的選擇機會，使不同類型的學(xué)生能夠充分發(fā)揮自己的優(yōu)勢和潛能。

GNVQ國家通用職業(yè)文憑。它是一種廣泛的職業(yè)教育課程，與學(xué)業(yè)路線中的GCSE和A-level相平行，但在學(xué)業(yè)深度和難度上并不亞于這類課程。它的學(xué)習(xí)的方式靈活多樣，學(xué)生可以根據(jù)自己的需要和興趣愛好安排課程，選擇學(xué)分制或模塊式的學(xué)習(xí)方式，甚至可以在學(xué)習(xí)的過程中穿插工作，在學(xué)習(xí)和工作同時進(jìn)行的過程中最終選擇自己最喜歡的事業(yè)。GNVQ的選科比較簡單，每門課程就是一個專業(yè)，所有受到許多英國學(xué)生和中國留學(xué)生的青睞。

第四部分：高等教育。顧名思義，高等教育是英國教育體系中的高級階段，它包括:

本科(Bachelor Degree)英國本科學(xué)士學(xué)位學(xué)制一般為三年，但有些大學(xué)的某些特殊專業(yè)要求讀四年或以上，如牙科。在英國人眼中，醫(yī)科和法律專業(yè)是最難考取也是最難讀的專業(yè)。因為這兩種學(xué)科的共同點是“人命關(guān)天”。

研究生(Master Degree)英國的研究生課程只需要一年時間，這與中國和美國都不同。在這一年里學(xué)生主要是寫論文和做課題研究，課堂教學(xué)較少，因此其他國家的留學(xué)生如果沒有在英國經(jīng)過一段時間的學(xué)習(xí)或語言不過關(guān)，是很難完成這一年課程的。

博士生(Doctorial Degree)

高級國家文憑(HND-Higher National Diploma)。

HND也是一種非常有用的文憑。它是職業(yè)教育體系中的最高階段，學(xué)制一般為兩年。HND理論上相當(dāng)于中國的大專文憑，但分類更細(xì)，專業(yè)性更強。進(jìn)入HND要求已經(jīng)完成A-Level或者GNVQ-Advanced的課程，中國的高中學(xué)生如果在某些方面（比如計算機）有特殊專長并且表現(xiàn)出相當(dāng)好的語言能力的話，也有可能直接進(jìn)入HND，但讀起來會相當(dāng)辛苦。

HND畢業(yè)后，如果取得比較好的成績，可以選擇直接進(jìn)入本科第三年的課程，通常是本校或聯(lián)校的相應(yīng)專業(yè)。也就是說，再加一年就可以取得學(xué)士學(xué)位。但英國最好的大學(xué)一般不接受此類學(xué)生。

大學(xué)每學(xué)年分為了3學(xué)期。第一學(xué)期為9月中至圣誕節(jié)（約12月中）；第二學(xué)期為1月中至萬圣節(jié)（約4月中）；第三學(xué)期為5月初。教學(xué)段是第一和第二學(xué)期，第三學(xué)期屬于考試。

UCAS

是大學(xué)院校入學(xué)委員會，為想至英國修讀大學(xué)課程的學(xué)生提供申請入學(xué)服務(wù)。對336所大學(xué)院校之申請，皆必須通過UCAS，學(xué)生并不能自己向?qū)W校直接申請。UCAS有一點類似中國的大學(xué)高考，兩者最大的不同是高考需要經(jīng)由聯(lián)考，而UCAS只是申請。經(jīng)由UCAS需填寫一份申請表(UCAS Form)，表格內(nèi)可填寫6個大學(xué)，亦即最多可同時向六所大學(xué)提出申請，也可以只申請一所大學(xué)。UCAS Form上六所大學(xué)排列的順序不是學(xué)生選擇的優(yōu)先級，優(yōu)先次序是在學(xué)生收到大學(xué)的offer letter后自行決定。