普特英语听力论坛论坛听写节目难度层次分级

精编WORD文档下载可编缉打印下载文档，远离加班熬夜普特英语听力论坛论坛听写节目难度层次分级篇一：普特英语听力免费学习英语What’sSoSpecialAboutASharpKnife?利刃特别在何处？Everyoneknowsthatasharpknifecutsbetterthanadullone,butdoyouknowwhy,exactly?Thepurposeofthecuttingedgeofaknifeistoconcentratetheforcethat’sbeingappliedatthehandle.Whenyoupushdownonthehandleofaknifeyouexertaforce.Theforceonthehandleandtheedgearethesame,buttheareasinwhichtheforceisconcentratedarequitedifferent.Atthehandleyourhand’sforceisspreadoverawidearea,butonthecuttingedgeitisconcentratedinaverysmallarea,sothereforethepressureontheedgeismuchgreater.Youcaneasilyseehowthisworkswithapieceofmodelingclay,anailwithawidehead,andanailwithasmallhead.Firstholdthenailwiththewideheadbyitsshaftandpushithead-firstintotheballofclay.精编WORD文档下载可编缉打印下载文档，远离加班熬夜Thendothesamewiththesmall-headednail.Thesmall-headednailgoesintotheclaymuchmoreeasilythanthewide-headednail.Sincetheheadofthesmallnailhaslesssurfaceareathanthebigone,theforceofyourpushisconcentratedinasmallerarea,exertsmorepressureontheclay,andsothenailgoesinmoreeasily.Thesameprincipalcausespointedhigh-heeledshoestosinkintoasoftsurfacemoreeasilythanflatshoes.Byapplyingthisprincipaltotheknifeyoucanseethatwithakeeneredgethere’sagreaterconcentrationofthepressureontheedge,soittakesmuchlessforcetomaketheknifecut.大家都知道锋利的刀刃的切割性能胜过钝刀，但您知道确切原因吗？刀刃的作用就是把人们用在刀把上的力集中起来。当你按下刀把时，你施加了一种力。这种力无论是在刀把还是刀刃上都是等量的，但力的聚集区域不同，所产生的效果十分迥异。在你手中的刀把上，力会在一个较广阔的区域传播，但在刀刃上，力会聚集在一个非常小的区域，因此刀刃上的压力会剧增。精编WORD文档下载可编缉打印下载文档，远离加班熬夜只要有一块橡皮泥、一枚宽头钉和一枚窄头钉，你很容易就能看到这一原理是如何运作的。首先将宽头钉的杆竖起，将其头朝下推入橡皮泥球。然后对窄头钉做同样动作。窄头钉比宽头钉更容易嵌入橡皮泥。由于窄头钉的头部面积比宽头钉小，你的推力将集中在一个更小的区域，对橡皮泥产生更大的压力，因此钉子更容易嵌入。同理，尖高跟鞋比平跟鞋更易陷入表面柔软的物体。将这一原理运用在刀上，你能看到，在锋利的刀刃上，压力能更好的聚集，因此切割起来更省力。篇二：【整理】2008-02-25-1530-Special听力训练-普特英语听力论坛【整理】2008-02-25-1530-Special听力训练-普特英语听力论坛:::主攻英语听力训练的英语学习论坛-PoweredbyDiscuz!默认表情IPB表情酷猴呆呆男diewupiaopiao我的帖子空间短消息论坛任务个人中心退出论坛主站博客家园辞典问吧商城搜索QQ群帮助普特英语听力论坛»Special听力训练»【整理】2008-02-25-1530最新经典佳句背诵！！！在线背单词新一代口语模仿训练系统上线！专治男女记不住单词的秘密[图]在线词典和异地的TA一起来练口语吧！只要你有麦！普特新精编WORD文档下载可编缉打印下载文档，远离加班熬夜增在线听写复读系统！普特英语新一代口译训练系统上线！返回列表回复发帖发新话题[SE1530NEWS]【整理】2008-02-25-1530qingchengshan发短消息加为好友qingchengshan当前离线UID280235帖子16665积分35704阅读权限100来自sichuan在线时间2554小时注册时间2005-10-11最后登录2021-2-10版主UID280235帖子16665贡献值35704普币3278听力指数15991阅读权限100来自sichuan在线时间2554小时注册时间2005-10-11最后登录2021-2-101#打印字体大小:tT发表于2008-2-2610:10|只看该作者[SE1530NEWS]【整理】2008-02-25-1530SENEWS-2008-02-25-1530【电信1】RealVideo/mp3【电信2】RealVideo/mp3【网通/教育网】RealVideo/mp3有疑难，请进--【1530News】--新闻突击队版主提示:精编WORD文档下载可编缉打印下载文档，远离加班熬夜一、若是自己的听写稿,请发帖时标注'Homework'.二、若是改稿,请发帖时标注'on某某人'并在修改处标红.三、为了达到最快的下载速度,推荐使用迅雷高速下载本站音频/视频材料.第十一期招收新学员报名正在进行中！！！【整理】SENEWS-2008-02-25-1530Specialthankstodaiyuan1128,ambertsui,yzmin,hongqipiaoand依yiyiItis15:30UniversalTime.I'mBobDoughtyinWashington.[1]Iraqiofficialssayatleast63peoplehavebeenkilledinrecentattacksagainstShiiteMuslims.OfficialssaidthevictimsweretravelingtothecentralcityofKarbalaforArbaeen,oneofShiiteIslam'sholiestgatherings.AtleastfourShiiteswerekilledinabombattackMondayinsouthernBaghdad.Morethan15otherswerereportedwounded.OnSundayabomberkilled56ShiiteswhohadstoppedforarestinIskandariyahsouthofBaghdad.TheUnitedStatesmilitaryandAmericanEmbassyblamedal-QaedainIraqsupportersforthatattack.精编WORD文档下载可编缉打印下载文档，远离加班熬夜[2]AsuicidebomberhaskilledPakistan'stopmilitarymedicalofficer.ThePakistanigovernmentsaystheArmy'sSurgeonGeneralLieutenantGeneralMushtaqAhmedBaigdiedinthebombingMondayinRawalpindi.Itsaidtheattackalsokilledhisdriverandatleastfivecivilians.Twenty-fiveotherpeoplewerereportedwounded.ThisisthesecondtimePakistan'smilitaryhasbeenattackedinRawalpindithismonth.InearlyFebruaryasuicidebomberstruckamilitarybus.Sixpeoplewerekilledandabout40othershurtinthatattack.[3]ThousandsofPalestinianshavedemonstratedintheGazaStriptoprotestIsrael'sblockadeoftheterritory.Almost5,000adultsandchildrenheldhandsalongaroadbetweenRafahonGaza'sborderwithEgyptandBeitHanun,innorthernGaza.ThousandsofIsraelitroopsstoodacrossthebordertopreventanysecurityviolation.Thedemonstrationendedwithoutanyviolence.IsraelsaystheblockadeisneededtopressureHamasmilitantstostoptheirrocketattacksagainstIsrael.[4]ThenewpresidentofSouthKoreaispromisingto精编WORD文档下载可编缉打印下载文档，远离加班熬夜increasewealthnotonlyinhisowncountry,butalsoinNorthKorea.LeeMyung-bakspokeathisswearing-inceremonyinSeoulMonday.Mr.LeesaidhismostimportantjobisSouthKorea'seconomicrecovery.HesaidSouthKoreaisreadytohelpNorthKoreaifitstopsworkonnuclearweaponsandbecomesamoreopencountry.Mr.LeealsosaidthetwoKoreascouldworkonanewcooperativepathiftheNorthgivesupitsnuclearweapons.Hesaidsuchcooperationcouldleadtolargeaidprojectsandinternationalsupport.About45,000peopleattendedtheceremony.AmongthemwereJapanesePrimeMinisterYasuoFukudaandseveralotherAsianleaders.AmericanSecretaryofStateCondoleezzaRicerepresentedtheUnitedStates.[5]AmericanDefenseSecretaryRobertGatesispromisingtohelpIndonesiaimproveitsdefenses.HesaystheUnitedStatesisreadytohelpIndonesiareformitsmilitary.HespokeaftermeetingswiththeIndonesianpresidentanddef