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如图所示,动圈式话筒的膜片与线圈固定在一起,线圈套在磁铁上,当我们对着话筒讲话时,声音使膜片振动,膜片带动线圈也一起振动,于是线圈中产生了随声音变化的电流.下图中能说明其工作原理的是( )
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动圈式话筒的结构如图它工作时①线圈运动能产生随着声音的变化而变化的电流②与膜片相连的线圈随之一起振动
如图所示动圈式话筒的膜片与线圈固定在一起结圈套在磁铁上当我们对着话筒讲话时声音使膜片振动膜片带动线圈
电动机
发电机
电磁铁
电铃
当你唱卡拉OK时要用到话筒麦克风.话筒的种类很多如图是动圈式话筒构造示意图.当你对着话筒说话或唱歌时
图甲是动圈式话筒的外形图乙是动圈式话筒内部结构示意图其中振膜与线圈固定在一起线圈套在磁铁上当我们对
电动机
发电机
电磁铁
动圈式扬声器
当你唱卡拉OK时要用到话筒麦克风.话筒的种类很多如图是动圈式话筒构造示意图.当你对着话筒说话或唱歌时
如图20.5-2所示是动圈式话筒的结构示意图当你对着话筒说话或唱歌时人的声带由于产生的声音通过传播到
如图所示动圈式话筒的膜片与线圈固定在一起线圈套在磁铁上.当我们对着话筒讲话时声音使膜片振动膜片带动线
动圈式话筒的结构如图它工作时①线圈运动能产生随着声音的变化而变化的电流②与膜片相连的线圈随之一起振动
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10·乌鲁木齐动圈式话筒的结构如图它工作时①线圈运动能产生随着声音的变化而变化的电流②与膜片相连的线
①②③④
②①④③
③①④②
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如图所示动圈式话筒的膜片与线圈固定在一起线圈套在磁铁上.当我们对着话筒讲话时声音使膜片振动膜片带动
电动机
发电机
电磁铁
电铃
如图所示动圈式话筒的膜片与线圈固定在一起线圈套在磁铁上.当我们对着话筒讲话时声音使膜片振动膜片带动
电动机
发电机
电磁铁
电铃
如图所示动圈式话筒的膜片与线圈固定在一起线圈套在磁铁上.当我们对着话筒讲话时膜片就会带动线圈一起振动
动圈式话筒用到了电磁感应的知识
动圈式话筒是焦耳定律的应用
动圈式话筒在工作时,将声信号转化为电信号
动圈式话筒在工作时,将电信号转化为声信号
图甲所示是动圈式话筒的外形图乙是动圈式话筒内部结构示意图其中振膜与线圈固定在一起线圈套在磁铁上当我们
电动机
发电机
电磁铁
动圈式喇叭
如图所示是一种常用的动圈式话筒麦克风及原理图当你对着话筒说话时声带发出声音并使与膜片相连的线圈振动线
如图所示当动圈式话筒工作时声音使得膜片与膜片相连的线圈跟着做切割运动产生感应电流这就是现象
如图所示动圈式话筒的膜片与线圈固定在一起线圈套在磁铁上.当我们对着话筒讲话时声音使膜片振动膜片带动
电动机
发电机
电磁铁
电铃
话筒麦克风种类很多如图是动圈式话筒的构造示意图.当我们对着话筒说话或唱歌时声音使膜片振动与膜片相连的
对着话筒说话时膜片振动,说明声音能传递能量
线圈在磁场中振动时,将声音信号转化成电信号
从能量转化的角度看,话筒是将机械能装化为电能的装置
扬声器的工作原理和话筒的工作原理相同
如下图甲所示是一种动圈式话筒当你对着话筒说话时声音使与膜片相连的线圈振动线圈在磁场中振动能产生随声音
动圈式话筒由音膜膜片和线圈及输出变压器组成
如图所示是动圈式话筒构造示意图.当你对着话筒说话时产生的声音使膜片带动线圈一起__________能
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I'velovedmymother'sdesksinceIwasjusttallenoughtositabovethetopofit.Mothersatwritingletters.Standingbyherchairlookingattheinkbottlepensandwhitepaper.Idecidedthattheactofwritingmustbeamostwonderfulthingintheworld. Yearslaterduringherfinalillness.Motherkeptdifferentthingsformysisterandbrother.Butthedesk.ShesaidagainisforElizabeth. Ineversawherangryneversawhercry.Iknewshelovedme;sheshowedinaction.ButasayounggirlIwantedtohaveheart﹣tohearttalksbetweenmotheranddaughter. Theyneverhappened.Andagulfopenedbetweenus.Iwastooemotional易动感情的.Butshelivedonthesurface表面. AsyearspassedandIhadmyownfamily.Ilovedmymotherandthankedherforourhappyfamily.Iwrotetoherincarefulwordsandaskedhertoletmeknowinanywayshechosethatshedidforgiveme. Myhopeturnedtodisappointmentthenlittleinterestandfinallypeaceitseemedthatnothinghappened.Icouldn'tbesurethattheletterhadevengottoMother.IonlyknewthatIhadwrittenitandIcouldstoptryingtomakeherintosomeoneshewasnot. Butthepresentofherdesktoldmeasshe'dneverbeenabletothatshewaspleasedthatwritingwasmychosenwork.Icleanedthedeskcarefullyandfoundsomepapersinsideaphotoofmyfatherandaone﹣paperletterfolded折叠andrefoldedmanytimes.Itwasmyletter. InanywayyouchooseMotheryoualwayschosetheactthatspeakslouderthanwords. 1Thewriterbegantolovehermother'sdesk. A.afterMotherdied B.beforeshebecameawriter C.whenshewasachild D.whenMothergaveittoher 2Thepassageshowsthat. A.Motherwascoldonthesurfacebutkindinherhearttoherdaughter B.Motherwastooseriousaboutherdaughterinwords C.Motherwrotetoherdaughterincarefulwords D.Motherwrotetoherdaughterincarelesswords 3Theunderlinedwordgulfinthepassagemeans. A.deepunderstandingbetweentheoldandtheyoung B.differentideasbetweenmotheranddaughter C.freetalksbetweenmotheranddaughter D.partoftheseagoingfarinland 4What'sbesttitleofthepassage? A.MylettertoMother. B.Motherandchildren. C.Mymother'sdesk. D.TalksbetweenMotherandme.
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Harmonium簧风琴isabookofpoetrybyAmericanpoetWallaceStevens1879﹣1955.Itwashisfirstbookpublishedin1923.Thebookisacollectionof85poemsdifferentinlengthfromjustafewlinestoseveralhundred. EducatedatHarvardUniversityandNewYorkLawSchoolWallaceStevenslivedinHartfordConnecticutformostofhislifeworkingataninsurancecompany.Hewrotepoemsintheeveningsandonhiswaytoandfromwork.Harmoniumisanunusualbookofhis﹣hisfirstbookitdidn'tcomeoutuntilhewas44yearsoldrepresentingthecumulative累积的poeticworksofhislifeupuntilthatpoint. NowconsideredoneofthegreatestcontributionstomodernpoetryHarmoniumwasnotfullyrecognizeduntilthelastyearsofStevens'life.Harmoniumisalsounusualinbeingentirelysong﹣likeandmusical.Itisamixofnotonlypureandphilosophical哲学的thoughtsbutalsoimaginaryanddisorderedlinesofwords.TomostreadersHarmoniumisespeciallygoodinthevariouswaysStevensputhisthoughtsinpoetry.Therearepopularshortpoemsfullofimaginativedetailsandattentiontosoundandtherearelongerandmorephilosophicalpoemswiththeweightandimportanceofepicpoetry史诗. AlthoughmanyofthepoemshewrotethroughouthislifetimeareaboutthenaturalbeautyofConnecticuthispoemscameoutperhapsmoretrulyfrominsideanimaginativepoeticbeautyashewrote IwastheworldinwhichIwalkedandwhatIsawOrheardorfeltcamenotbutfrommyself; AndthereIfoundmyselfmoretrulyandmorestrange. 1WhyisHarmoniumanunusualbookofthewriter? A.Itwashisfirstandonlybook. B.Itcameoutinhislastyearsoflife. C.Itwasaresultofhispart﹣timejob. D.Itshowshisyearsofworkonpoetry. 2AsagreatworkofmodempoetrywhatisspecialofHarmonium? A.Itisacollectionofonly85poems. B.Itfirstputsphilosophicalthoughtsinpoetry. C.Variousinformthepoemsallsoundbeautiful. D.Connecticutbecomesbelterbecauseofthepoems. 3Whichofthefollowingcanbethebesttitleofthetext? A.WallaceStevensaspecialpoet. B.Ahobbymakesabrilliantpoet. C.Harmoniumbeautifulmodempoetry. D.ToknowConnecticutreadHarmonium.
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Luckythesereptilesaresmallandthatmadethesolutioneasier.
ThewriterMargaretMitchellisbestknownforwritingGonewiththeWindfirstpublishedin1936.HerbookandthemoviebasedonittellastoryofloveandsurvivalduringtheAmericanCivilWar.VisitorstotheMargaretMitchellHouseinAtlantaGeorgiacangowhereshelivedwhenshestartedcomposingthestoryandlearnmoreaboutherlife. OurfirststopattheMargaretMitchellHouseisanexhibitareatellingaboutthewriter'slife.ShewasborninAtlantain1900.Shestartedwritingstorieswhenshewasachild.ShestartedworkingasareporterfortheAtlantaJournalnewspaperin1922.OnephotographofMs.MitchellcalledPeggyshowshertalkingtoagroupofyoungcollegeboys.Shewasonlyaboutoneandahalfmeterstall.Theyoungmentoweroverherbutsheseemsveryhappyandsureofherself.ThetourguideexplainsNowinthispicturePeggyisinterviewingsomeboysfromGeorgiaTechaskingthemsuchquestionsas‘Wouldyoureallymarryawomanwhoworks?'Andtodayit'dbe‘Wouldyoumarryonewhodoesn't?' TheMargaretMitchellHouseisabuildingthatoncecontainedseveralapartments.NowweenterthefirstfloorapartmentwhereMs.MitchelllivedwithherhusbandJohnMarsh.TheymadefunofthesmallapartmentbycallingitTheDump. Around1926MargaretMitchellhadstoppedworkingasareporterandwasathomehealingafteraninjury.Herhusbandbroughtherbookstoreadfromthelibrary.Shereadsomanybooksthatheboughtheratypewriterandsaiditwastimeforhertowriteherownbook.OurguidesaysGonewiththeWindbecameahugesuccess.MargaretMitchellreceivedthePulitzerPrizeforthebook.In1939thefilmversionwasreleased.ItwontenAcademyAwardsincludingBestPicture. 1ThebookGonewiththeWindwas. A.firstpublishedonanewspaper B.awardedtenAcademyAwards C.writteninTheDump D.adaptedfromamovie 2TheunderlinedphrasetoweroverinParagraph2isclosestinmeaningto. A.beverypleasedwith B.showgreatrespectfor C.bemuchtallerthan D.showlittleinterestin 3WhydidMs.Mitchellstopworkingasareporteraccordingtothepassage? A.Becauseshewasrichenough. B.Becauseshewasinjuredthen. C.Becauseherhusbanddidn'tlikeit. D.Becauseshewantedtowritebooks. 4Whichisthebesttitleforthepassage? A.GonewiththeWindAHugeSuccess. B.MargaretMitchellAGreatFemaleWriter. C.AnIntroductionoftheMargaretMitchellHouse. D.ATriptoKnowMargaretMitchell.
假定英语课上英语老师要求同桌之间相互修改作文.请你修改你同桌写的以下作文.文中共有10处错误每句中最多2处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处添加一个漏字符号∧并在其下面写出该加的词; 删除把多余的词用删除号\删掉; 修改在错词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. NorthwestChinaispartofthesandstormcentreinCentralAsia.Sandstormsbeginsindesertareas.InChinatheyhaveincreasedastheresultofdesertification.Thisisbecauseofclimatechangesorbecausepeoplecutdowntreeanddigupgrass. SandstormssometimesseriousaffectBeijing.Citizenswakeuptoorangeskyandstrongwindsinwhichbringthickdust.Tothewesternofthecityadesertliesonly250kilometresawaygetcloseryearbyyear.Topreventthemthegovernmenthasalreadyplantmorethan30billiontrees.
Isetaboutresearchingthehabitsofsnakestofindeasiestwaytotrapthem.
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