首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
如图，在复平面内，点A表示复数z，则图中表示z的共轭复数的点是（ ）．
查看本题答案
包含此试题的试卷
高考历史《单项选择》真题及答案
点击查看
你可能感兴趣的试题
在复平面内复数z＝i为虚数单位的共轭复数对应的点位于
第一象限
第二象限
第三象限
第四象限
如图所示在复平面内点 A 表示复数 z 则图中表示 z 的共轭复数的点是
A
B
C
D
如图在复平面内点 A 表示复数 z 则图中表示 z 的共轭复数的点是
A
B
C
D
已知i为虚数单位复数z=1+2ii的共轭复数在复平面内对应的点位于
第一象限
第二象限
第三象限
第四象限
复数z满足z1﹣i=|1+i|则复数z的共轭复数在复平面内的对应点位于
第一象限
第二象限
第三象限
第四象限
如图在复平面内点A表示复数z则图中表示z的共轭复数的点是
A
B
C
D
已知i是虚数单位z=1+i为z的共轭复数则复数在复平面上对应的点的坐标为.
2017年·北京西城二模文科在复平面内复数z对应的点是Z1﹣2则复数z的共轭复数=．
已知复数z满足z＝那么z的共轭复数在复平面上对应的点位于
第一象限
第二象限
第三象限
第四象限
如图在复平面内点A表示复数z则图中表示z的共轭复数的点是．
A
B
C
D
若i为虚数单位图中复平面内点Z.表示复数z则表示复数的点是
E.
F.
G.
H.
已知复数z满足是虚数单位则复数z的共轭复数在复平面内所对应的点的坐标为
（1,1）
（－1，－1）
（1，－1）
（－1,1）
已知复数z满足是虚数单位则复数z的共轭复数在复平面内所对应的点的坐标为
（1,1）
（－1，－1）
（1，－1）
（－1,1）
在复平面内复数z=则其共轭复数z对应的点位于
第一象限
第二象限
第三象限
第四象限
在复平面内复数z对应的点是z-12则复数z的共轭复数=
-1+2i
-1-2i
1+2i
1-2i
复数z满足z1﹣i＝|1+i|则复数z的共轭复数在复平面内的对应点位于
第一象限
第二象限
第三象限
第四象限
如图在复平面内点
表示复数z，则图中表示z的共轭复数的点是( )
A.A.
B.
C.
D.
在复平面内复数z＝i为虚数单位的共轭复数对应的点位于
第一象限
第二象限
第三象限
第四象限
若复数z满足z1+i=|1+i|则在复平面内z的共轭复数对应的点位于
第一象限
第二象限
第三象限
第四象限
已知复数z的共轭复数z＝1＋2ii为虚数单位则z在复平面内对应的点位于
第一象限
第二象限
第三象限
第四象限
热门试题
更多
Itiseasytooverlooktherolethatyourbodyplaysininfluencingyourmood情绪.whenyouare49youmayfindyourselfblamingworkpressuresoranunknownfuture.Howeveritcouldjustbethatyou’vebeensittingbehindyoudesktoolong. Onewaytoimproveyourmoodis50.Psychologicallyitprovidesyouwithabreakfromthestressesinyourlife.Alsointheprocessyoumayaimfor51goalslikeamewpersonalrunningrecordorabetterbodyshape.Theachievementofaparticulargoalmakesyoufeelgoodandcontributestoyour52.Thatiswhyexercisehasbeenshownto53yourself-respect. Youdonothavetotrainyourself54tofeelthepsychologicalbenefitsofexercise.Whatreallymattersis55notintensity强度ofyourexercise.Youcantrywalkingfor30minutesfivetimesperweekorsimplygardeningonweekends.
ItiswidelyknownthatanyEnglishconversationbeginswithTheWeather.SuchafixationwiththeweatherfindsexpressioninDr.Johnson’sfamouscommentthatWhentwoEnglishmeettheirfirsttalkisofweather.ThoughJohnson’sobservationisasaccuratenowasitwasovertwohundredyearsagomostcommentatorsfailtocomeupwithaconvincingexplanationforthisEnglishweather-speak. BillBrysonforezampleconcludesthatastheEnglishweatherisnotatallexcitingtheobsessionwithitcanhardlybeunderstood.HearguesthatToanoutsiderthemoststrikingthingabouttheEnglishweatheristhatthereisnotverymuchofit.SimplythereasonisthattheunusualandunpredictableweatherisalmostunknownintheBritishIsles. JeremyPaxmanhoweverdisagreeswithBrysonarguingthattheEnglishweatherisbynatureattractive.BrysoniswronghesaysbecausetheEnglishpreferencefortheweatherhasnothingtodowiththenaturalphenomena.Theinterestislessinthephenomenathemselvesbutinuncertainty.AccordingtohimtheweatherinEnglandisverychangeableanduncertainanditattractstheEnglishaswellastheoutsider. BrysonandPaxmanstandforcommonmisconceptionsabouttheweather-speakamongtheEnglish.Bothcommentatorssomehowaremissingthepoint.TheEnglishweatherconversationisnotreallyabouttheweatheratall.Englishweather-speakisasystemofsignswhichisdevelopedtohelpthespeakersovercomethenaturalreserveandactuallytalktoeachother.Everyoneknowsconversationsstartingwithweather-speakarenotrequestsforweatherdata.RathertheyareroutinegreetingsconversationstartersortheblankfillersInotherwordsEnglishweather-speakisameansofsocialbonding. TheauthormentionsDr.Johnson’scommenttoshowthat__________.
NotallbodiesofwatheraresoevidentlyaliveastheAtlanticOceananS-shapedbodyofwatercovering33millionsquaremiles.TheAtlantichasinasensereplacedtheMediterraneanastheinlandseaofWeaterncivilization.UnlikerealinlandseaswhichseemstrangelystilltheAtlanticisrichinoceanicliveliness.Itisperhapsnotsurprisingthatitsvitalityhasbeenmuchwrittenaboutbyancientpoets. StrmatSeaashortpoemwrittenaround700isgenerallyregardedasoneofmankind’searliestartisticrepresentationsoftheAtlantic. Whenthewindisfromthewest Allthewavesthatcannottest Totheeastmustthunderon Wherethebrighttreeofthesun Isrootedintheosean’sbreast. AsthepoemsuggeststheAtlanticisneverdeadanddull.Itisanoceanthatmovesimpressivelyandendlessly.Itmakesallkindsofnoise-itisforeverthunderingboilingcrashingandwhistling. ItiseasytoimaginetheAtlantictryingtodrawbreath-perhapsnotsonoticeablyoutinmid–oceanbutwhereitmeetslanditswatersbathingupanddownasandybeach.Itmimics模仿nearlyperfectlythesteadybreathingofalivingcreature.Itisfilledwithsymbioticexistencestoo;unimaginablequantitiesofcreatureslittleandlargealikemixwithinitsdepthsinakindofoceanicharmonygivingtothewatersafeelingofheartbeatakindofsub-oceanvitality.Andithasapsychology.Ithaspersonalities:sometimespeacefulandpleasantonrareoccasionsroughandwild;alwaysitisstrongandstriking. Whatdoestheunderlinedwordsymbioticmean
NotallbodiesofwatheraresoevidentlyaliveastheAtlanticOceananS-shapedbodyofwatercovering33millionsquaremiles.TheAtlantichasinasensereplacedtheMediterraneanastheinlandseaofWeaterncivilization.UnlikerealinlandseaswhichseemstrangelystilltheAtlanticisrichinoceanicliveliness.Itisperhapsnotsurprisingthatitsvitalityhasbeenmuchwrittenaboutbyancientpoets. StrmatSeaashortpoemwrittenaround700isgenerallyregardedasoneofmankind’searliestartisticrepresentationsoftheAtlantic. Whenthewindisfromthewest Allthewavesthatcannottest Totheeastmustthunderon Wherethebrighttreeofthesun Isrootedintheosean’sbreast. AsthepoemsuggeststheAtlanticisneverdeadanddull.Itisanoceanthatmovesimpressivelyandendlessly.Itmakesallkindsofnoise-itisforeverthunderingboilingcrashingandwhistling. ItiseasytoimaginetheAtlantictryingtodrawbreath-perhapsnotsonoticeablyoutinmid–oceanbutwhereitmeetslanditswatersbathingupanddownasandybeach.Itmimics模仿nearlyperfectlythesteadybreathingofalivingcreature.Itisfilledwithsymbioticexistencestoo;unimaginablequantitiesofcreatureslittleandlargealikemixwithinitsdepthsinakindofoceanicharmonygivingtothewatersafeelingofheartbeatakindofsub-oceanvitality.Andithasapsychology.Ithaspersonalities:sometimespeacefulandpleasantonrareoccasionsroughandwild;alwaysitisstrongandstriking. UnlikerealinlandseastheAtlanticOceanis__________.
请阅读下面两篇短文掌握大意然后从36-55各题所给的四个选项ABCD中选出最佳选项并在答题卡上将该选项的标号涂黑 WhenJoewasabouttostartschool.allsignspointedtosuccess.Yetthingsturnedouttobequite36.Thefourthgradeevenfoundhimatthe37oftheclass.Joestruggleddayandnightbutitdidnot38-untilonestormyaftermoon. Onthataftermoon39themathteacherstartedtointroducedifficultconceptsdadkCloudscoveredtheskyandthestoneadin.Hardthoushetriedtomakethekids40thethunderwonthebattlefortheirattention.Noone41theconcepts.ExceptJoe.Heundemtoodthemandansweredallthequestionscorrectly.Theteacherpattedhimontheback.andtoldhimtogoaroundtotheothersandexplainhowhehadmanagedit.42byhisnewfoundsuccess.Joemovedquicklythroughouttheroom.Soonmathtimewasfollowedbythetimefor43.Allchildrennaturallydrew44picturesonsuchaday.ExceptforJoe. SincethenJoestarted45.Thoughhenevermadeittothetophismathteacherwasalways46andcuriousaboutthechange:WhyhadthatstomrydaychangedJoe OnthedayJoegraduaredhepresentedtheteacherwithhismoat47possession—thepictureof.brightyellowsun.OnthepictureJoehadwritten:ThisisthedayI48mybrightness.
请阅读下面两篇短文掌握大意然后从36-55各题所给的四个选项ABCD中选出最佳选项并在答题卡上将该选项的标号涂黑 WhenJoewasabouttostartschool.allsignspointedtosuccess.Yetthingsturnedouttobequite36.Thefourthgradeevenfoundhimatthe37oftheclass.Joestruggleddayandnightbutitdidnot38-untilonestormyaftermoon. Onthataftermoon39themathteacherstartedtointroducedifficultconceptsdadkCloudscoveredtheskyandthestoneadin.Hardthoushetriedtomakethekids40thethunderwonthebattlefortheirattention.Noone41theconcepts.ExceptJoe.Heundemtoodthemandansweredallthequestionscorrectly.Theteacherpattedhimontheback.andtoldhimtogoaroundtotheothersandexplainhowhehadmanagedit.42byhisnewfoundsuccess.Joemovedquicklythroughouttheroom.Soonmathtimewasfollowedbythetimefor43.Allchildrennaturallydrew44picturesonsuchaday.ExceptforJoe. SincethenJoestarted45.Thoughhenevermadeittothetophismathteacherwasalways46andcuriousaboutthechange:WhyhadthatstomrydaychangedJoe OnthedayJoegraduaredhepresentedtheteacherwithhismoat47possession—thepictureof.brightyellowsun.OnthepictureJoehadwritten:ThisisthedayI48mybrightness.
Themorninghadbeenadisaster.MytoothwasachingandI’dbeeninanargumentwithafriend.HerwordsstillhurtThetroublewithyouisthatyouwon’tputyourselfinmyplace.Can’tyouseethingsfrommypointofviewIshookmyheadstubbomly—andfelttheacheinmytooth..I’dthoughtIcouldholdouttillmydentistcamebackfromholidaybutthepainwasreallyunbearable.Istartedcallingthedentistsinthephonebookbutnoonecouldseemeimmediately.FinallyataboutlunchtimeIgotlucky. Ifyoucomebyrightnowthereceptionistsaidthedentistwillfityouin. Ilookmypurseandkeysandrushedtomycar.ButsuddenlyIbegantodoubtaboutthedentist.WhatkindofdentistwouldbesoeagertotreatsomeoneatsuchshortnoticeWhywasn’theasbusyastheothers Inthedentist’sofficeIsatdownandlookedaround.IsawnothingbutthebarewallsandIbecameevenmoreworried.Theassistantnoticedmynervousnessandplacedherwarmhandovermyice-coldone. WhenItoldhermyfearsshelaughedandsaidDon’tworry.Thedentistisverygood. HowlongdoIhavetowaitforhimIaskedimpatiently. Comeonheiscoming.Justliedownandrelax.Andenjoytheartworktheassistantsaid. TheartworkIwaspuzzled. ThechairwentbacksuddenlyIsmiled.TherewasabeautifulpicturerightwhereIcouldenjoyitontheceiling.Howconsideratethedentistwas！AtthatmomentIbegantounderstandwhatmyfriendmeantbyherwords. Whatarelief！ Whichofthefollowingbestdescribestheauthor’sfeelingthatmorning
Itiseasytooverlooktherolethatyourbodyplaysininfluencingyourmood情绪.whenyouare49youmayfindyourselfblamingworkpressuresoranunknownfuture.Howeveritcouldjustbethatyou’vebeensittingbehindyoudesktoolong. Onewaytoimproveyourmoodis50.Psychologicallyitprovidesyouwithabreakfromthestressesinyourlife.Alsointheprocessyoumayaimfor51goalslikeamewpersonalrunningrecordorabetterbodyshape.Theachievementofaparticulargoalmakesyoufeelgoodandcontributestoyour52.Thatiswhyexercisehasbeenshownto53yourself-respect. Youdonothavetotrainyourself54tofeelthepsychologicalbenefitsofexercise.Whatreallymattersis55notintensity强度ofyourexercise.Youcantrywalkingfor30minutesfivetimesperweekorsimplygardeningonweekends.
Themorninghadbeenadisaster.MytoothwasachingandI’dbeeninanargumentwithafriend.HerwordsstillhurtThetroublewithyouisthatyouwon’tputyourselfinmyplace.Can’tyouseethingsfrommypointofviewIshookmyheadstubbomly—andfelttheacheinmytooth..I’dthoughtIcouldholdouttillmydentistcamebackfromholidaybutthepainwasreallyunbearable.Istartedcallingthedentistsinthephonebookbutnoonecouldseemeimmediately.FinallyataboutlunchtimeIgotlucky. Ifyoucomebyrightnowthereceptionistsaidthedentistwillfityouin. Ilookmypurseandkeysandrushedtomycar.ButsuddenlyIbegantodoubtaboutthedentist.WhatkindofdentistwouldbesoeagertotreatsomeoneatsuchshortnoticeWhywasn’theasbusyastheothers Inthedentist’sofficeIsatdownandlookedaround.IsawnothingbutthebarewallsandIbecameevenmoreworried.Theassistantnoticedmynervousnessandplacedherwarmhandovermyice-coldone. WhenItoldhermyfearsshelaughedandsaidDon’tworry.Thedentistisverygood. HowlongdoIhavetowaitforhimIaskedimpatiently. Comeonheiscoming.Justliedownandrelax.Andenjoytheartworktheassistantsaid. TheartworkIwaspuzzled. ThechairwentbacksuddenlyIsmiled.TherewasabeautifulpicturerightwhereIcouldenjoyitontheceiling.Howconsideratethedentistwas！AtthatmomentIbegantounderstandwhatmyfriendmeantbyherwords. Whatarelief！ Whydidtheauthorsuddenlysmile
请阅读下面两篇短文掌握大意然后从36-55各题所给的四个选项ABCD中选出最佳选项并在答题卡上将该选项的标号涂黑 WhenJoewasabouttostartschool.allsignspointedtosuccess.Yetthingsturnedouttobequite36.Thefourthgradeevenfoundhimatthe37oftheclass.Joestruggleddayandnightbutitdidnot38-untilonestormyaftermoon. Onthataftermoon39themathteacherstartedtointroducedifficultconceptsdadkCloudscoveredtheskyandthestoneadin.Hardthoushetriedtomakethekids40thethunderwonthebattlefortheirattention.Noone41theconcepts.ExceptJoe.Heundemtoodthemandansweredallthequestionscorrectly.Theteacherpattedhimontheback.andtoldhimtogoaroundtotheothersandexplainhowhehadmanagedit.42byhisnewfoundsuccess.Joemovedquicklythroughouttheroom.Soonmathtimewasfollowedbythetimefor43.Allchildrennaturallydrew44picturesonsuchaday.ExceptforJoe. SincethenJoestarted45.Thoughhenevermadeittothetophismathteacherwasalways46andcuriousaboutthechange:WhyhadthatstomrydaychangedJoe OnthedayJoegraduaredhepresentedtheteacherwithhismoat47possession—thepictureof.brightyellowsun.OnthepictureJoehadwritten:ThisisthedayI48mybrightness.
ItiswidelyknownthatanyEnglishconversationbeginswithTheWeather.SuchafixationwiththeweatherfindsexpressioninDr.Johnson’sfamouscommentthatWhentwoEnglishmeettheirfirsttalkisofweather.ThoughJohnson’sobservationisasaccuratenowasitwasovertwohundredyearsagomostcommentatorsfailtocomeupwithaconvincingexplanationforthisEnglishweather-speak. BillBrysonforezampleconcludesthatastheEnglishweatherisnotatallexcitingtheobsessionwithitcanhardlybeunderstood.HearguesthatToanoutsiderthemoststrikingthingabouttheEnglishweatheristhatthereisnotverymuchofit.SimplythereasonisthattheunusualandunpredictableweatherisalmostunknownintheBritishIsles. JeremyPaxmanhoweverdisagreeswithBrysonarguingthattheEnglishweatherisbynatureattractive.BrysoniswronghesaysbecausetheEnglishpreferencefortheweatherhasnothingtodowiththenaturalphenomena.Theinterestislessinthephenomenathemselvesbutinuncertainty.AccordingtohimtheweatherinEnglandisverychangeableanduncertainanditattractstheEnglishaswellastheoutsider. BrysonandPaxmanstandforcommonmisconceptionsabouttheweather-speakamongtheEnglish.Bothcommentatorssomehowaremissingthepoint.TheEnglishweatherconversationisnotreallyabouttheweatheratall.Englishweather-speakisasystemofsignswhichisdevelopedtohelpthespeakersovercomethenaturalreserveandactuallytalktoeachother.Everyoneknowsconversationsstartingwithweather-speakarenotrequestsforweatherdata.RathertheyareroutinegreetingsconversationstartersortheblankfillersInotherwordsEnglishweather-speakisameansofsocialbonding. AccordingtothepassageJeremyPaxmanbelievesthat__________.
Oneofthegreatestgiftsonegenerationcangivetoothergenerationsisthewisdomithasgainedfromexperience.Thisideahasinspiredtheaward-winningphotographerAndrewZuckerman.Heinterviewedandtookphotosoffiftyover-sixty-five-year-oldsallovertheworld.Hisprojectexploresvariousaspectsoftheirlives.Thephotosandinterviewsarenowavailableonourwebsite.Clickontheintroductionstoreadthecompleteinterviews.Letusnowhaveacultureofpeace.—FedericoMayorZaragozaSpainFedericoMayorZaragozaobtainedadoctorateinpharmacy药学fromtheComplutenseUniversityofMadridin1958.AftermanyyearsspentinpoliticshebecameDirector-CeneralofUNESCOin1987.In1999heforaCultureofPeaceofwhichheisnowthepresident.Inadditiontomanyhehaspublishedfourcollectionsofpoemsandseveralbooksofeaasys. Writingisadiscovery.—NadineCordimerSouthAfricaDuetoaweakheartNadineordimerattendedschoolanduniversitybriefly.Shereadwidelyandbeganwritingatanearlyage.Shepublishedherfirstshortstoryattheageoffifteenandhascompletedalargenumberbeentranslatedintofortylanguages.In1991CordimerwontheNobelPrize. Jzaaisabouttheonlyformofantoday.—DaveBrubeckUSADaveBrubeckstudiedmusicattheUniversityofthePacificandgraduatedin1942.AfterWorldWarTwohewasencouragedtoplayjazz.In1951herecordedhisfirstalbum专辑.Brubeck’s1959albumhasbecomeajazzaGrammylifetimeAchievementAwardin1996. FormorefiguresCLICKHERE. WhydidAndrewZuckermanchoosethefiftyeldersforhisproject
Itiseasytooverlooktherolethatyourbodyplaysininfluencingyourmood情绪.whenyouare49youmayfindyourselfblamingworkpressuresoranunknownfuture.Howeveritcouldjustbethatyou’vebeensittingbehindyoudesktoolong. Onewaytoimproveyourmoodis50.Psychologicallyitprovidesyouwithabreakfromthestressesinyourlife.Alsointheprocessyoumayaimfor51goalslikeamewpersonalrunningrecordorabetterbodyshape.Theachievementofaparticulargoalmakesyoufeelgoodandcontributestoyour52.Thatiswhyexercisehasbeenshownto53yourself-respect. Youdonothavetotrainyourself54tofeelthepsychologicalbenefitsofexercise.Whatreallymattersis55notintensity强度ofyourexercise.Youcantrywalkingfor30minutesfivetimesperweekorsimplygardeningonweekends.
请结合材料按要求用英文写作 Amothersaid”Mysonisalwaysonthephonesleepingoutwithhisfriends.orinhisroom.Heneverhastimetotalktome.”要求: 1就此材料发表你的看法; 2紧扣材料有明确的观点; 3词数不少于60; 4在答题卡上作答
Oneofthegreatestgiftsonegenerationcangivetoothergenerationsisthewisdomithasgainedfromexperience.Thisideahasinspiredtheaward-winningphotographerAndrewZuckerman.Heinterviewedandtookphotosoffiftyover-sixty-five-year-oldsallovertheworld.Hisprojectexploresvariousaspectsoftheirlives.Thephotosandinterviewsarenowavailableonourwebsite.Clickontheintroductionstoreadthecompleteinterviews.Letusnowhaveacultureofpeace.—FedericoMayorZaragozaSpainFedericoMayorZaragozaobtainedadoctorateinpharmacy药学fromtheComplutenseUniversityofMadridin1958.AftermanyyearsspentinpoliticshebecameDirector-CeneralofUNESCOin1987.In1999heforaCultureofPeaceofwhichheisnowthepresident.Inadditiontomanyhehaspublishedfourcollectionsofpoemsandseveralbooksofeaasys. Writingisadiscovery.—NadineCordimerSouthAfricaDuetoaweakheartNadineordimerattendedschoolanduniversitybriefly.Shereadwidelyandbeganwritingatanearlyage.Shepublishedherfirstshortstoryattheageoffifteenandhascompletedalargenumberbeentranslatedintofortylanguages.In1991CordimerwontheNobelPrize. Jzaaisabouttheonlyformofantoday.—DaveBrubeckUSADaveBrubeckstudiedmusicattheUniversityofthePacificandgraduatedin1942.AfterWorldWarTwohewasencouragedtoplayjazz.In1951herecordedhisfirstalbum专辑.Brubeck’s1959albumhasbecomeajazzaGrammylifetimeAchievementAwardin1996. FormorefiguresCLICKHERE. WhomostprobablysaidMyeducationhasbeenthelibraryandbooksintheinterviewreflectingonhis/herexperience
请阅读下面两篇短文掌握大意然后从36-55各题所给的四个选项ABCD中选出最佳选项并在答题卡上将该选项的标号涂黑 WhenJoewasabouttostartschool.allsignspointedtosuccess.Yetthingsturnedouttobequite36.Thefourthgradeevenfoundhimatthe37oftheclass.Joestruggleddayandnightbutitdidnot38-untilonestormyaftermoon. Onthataftermoon39themathteacherstartedtointroducedifficultconceptsdadkCloudscoveredtheskyandthestoneadin.Hardthoushetriedtomakethekids40thethunderwonthebattlefortheirattention.Noone41theconcepts.ExceptJoe.Heundemtoodthemandansweredallthequestionscorrectly.Theteacherpattedhimontheback.andtoldhimtogoaroundtotheothersandexplainhowhehadmanagedit.42byhisnewfoundsuccess.Joemovedquicklythroughouttheroom.Soonmathtimewasfollowedbythetimefor43.Allchildrennaturallydrew44picturesonsuchaday.ExceptforJoe. SincethenJoestarted45.Thoughhenevermadeittothetophismathteacherwasalways46andcuriousaboutthechange:WhyhadthatstomrydaychangedJoe OnthedayJoegraduaredhepresentedtheteacherwithhismoat47possession—thepictureof.brightyellowsun.OnthepictureJoehadwritten:ThisisthedayI48mybrightness.
Almosteverymachinewithmovingpartshaswheelsyetnooneknowsexactlywhenthefirstwheelwasinventedorwhatitwasusedfor.Wedoknowhoweverthattheyexistedover5500yearsagoinancientAsia. Theoldestknowntransportwheelwasdiscoveredin2002inSlovenia.Itisover5100yearsold.Evidencesuggeststhatwheelsfortransportdidn’tbecomepopularfor.whilethough.Thiscouldbebecauseanimalsdidaperfectlygoodjobofcarryingfarmingtoolsandhumansaround. Butitcouldalsobebecauseofadifficultsituation.Whilewheelsneedtorollonsmoothsurfacesroadswithsmoothsurfacesweren’tgoingtobeconstructeduntiltherewasplentyofdemandforthem.Eventuallyroadsurfacesdidbecomesmootherbutthisdifficultsituationappearedagainafewcenturieslater.Therehadbeennoimportantchangesinwheelandvehicledesignbeforethearrivalofmodernroaddesign. Inthemid-1700saFrenchmancameupwithanewdesignofroad--abaselayer层oflargestonescoveredwithathinlayerofsmalleratones.AScotsmanimprovedonthisdesigninthe1820sandastronglastingroadsurfacebecameareality.AtaroundthesametimemetalhubsthecentralpartofawheelcameintobeingfollowedbytheWheelswereinventedin1967sixtyyearsaftertheappearanceoftarmackedroads泊油路.Aswheeldesigntookoffvehiclesgotfasterandfaster.Whatmightexplainwhytransportwheelsdidn’tbecomepopularforsometime
Almosteverymachinewithmovingpartshaswheelsyetnooneknowsexactlywhenthefirstwheelwasinventedorwhatitwasusedfor.Wedoknowhoweverthattheyexistedover5500yearsagoinancientAsia. Theoldestknowntransportwheelwasdiscoveredin2002inSlovenia.Itisover5100yearsold.Evidencesuggeststhatwheelsfortransportdidn’tbecomepopularfor.whilethough.Thiscouldbebecauseanimalsdidaperfectlygoodjobofcarryingfarmingtoolsandhumansaround. Butitcouldalsobebecauseofadifficultsituation.Whilewheelsneedtorollonsmoothsurfacesroadswithsmoothsurfacesweren’tgoingtobeconstructeduntiltherewasplentyofdemandforthem.Eventuallyroadsurfacesdidbecomesmootherbutthisdifficultsituationappearedagainafewcenturieslater.Therehadbeennoimportantchangesinwheelandvehicledesignbeforethearrivalofmodernroaddesign. Inthemid-1700saFrenchmancameupwithanewdesignofroad--abaselayer层oflargestonescoveredwithathinlayerofsmalleratones.AScotsmanimprovedonthisdesigninthe1820sandastronglastingroadsurfacebecameareality.AtaroundthesametimemetalhubsthecentralpartofawheelcameintobeingfollowedbytheWheelswereinventedin1967sixtyyearsaftertheappearanceoftarmackedroads泊油路.Aswheeldesigntookoffvehiclesgotfasterandfaster.Howisthelastparagraphmainlydeveloped
热门题库
更多
国家统考科目
香港法概论
反间谍法
__学
合同法
证据学
民事诉讼法学
民法学
刑法学
消费者权益保护法
法理学
竞争法
国际公法
国际经济法
农村政策法规
行政法与行政诉讼法
A.A. B. C. D.
湘公网安备 43130202000226号