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已知复数z的虚部为在复平面内复数z对应的向量的模为2求复数z.
实数m分别取什么数值时复数z=m2+5m+6+m2-2m-15i1与复数2-12i相等2与复数12+
复数z=1+i为z的共轭复数则.
复数的共轭复数是
按要求写出相应的词1.this反义词________2.these反义词________3.it复数
复数其中i是虚数单位则复数z的共轭复数为
复数的共轭复数是___
与正弦量具有一一对应关系的复数电压复数电流称之为
怎样用复数表示正弦量为什么要用复数表示
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
如果一个复数的实部和虚部相等则称这个复数为等部复数若复数Z=1+aii为等部复数则实数a的值为
﹣1
0
1
2
[说明]编写一个完整的JavaApplet程序使用复数类Complex验证两个复数1+2i和3+4i
数据压缩编码方法可以分为无损压缩和有损压缩其中无损压缩编码的特点是.
有失真恢复数据、压缩比高
无失真恢复数据、压缩比高
有失真恢复数据、压缩比低
无失真恢复数据、压缩比低
复数3i-1的共轭复数是
已知复数z1=3-iz2是复数-1+2i的共轭复数则复数-的虚部等于________.
定义若z2=a+biab∈R.i为虚数单位则称复数z是复数a+bi的平方根.根据定义则复数-3+4i
设复数z满足z1+i=2+4i其中i为虚数单位则复数z的共轭复数为__________.
下列命题正确的是________.填序号①复数的模总是正实数②虚轴上的点与纯虚数一一对应③相等的向量
设复数z=2+i则复数z1﹣z的共轭复数为
﹣1﹣3i
﹣1+3i
1+3i
1﹣3i
复数的共轭复数为
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C WhenitcomestofriendsIdesirethosewhowillsharemyhappinesswhopossesswingsoftheirownandwhowillflywithme.Iseekfriendswhosequalitiesilluminatemeandtrainmeupforlove.ItisforthesepeoplethatIreservetheglowinghourstoogoodnottoshare. WhenIwasintheeighthgradeIhadafriend.Wewereshyand"tooserious"aboutourstudieswhenitwasbecomingfashionablewithourclassmatestolearnacceptablesocialbehaviors.WesaidlittleatschoolbutshewouldcometomyhouseandwewouldSitdownwithpencilsandpaperandoneofuswouldsay:"Let’sstartwithatrainwhistletoday."Wewouldsitquietlytogetherandwriteseparatepoemsorstoriesthatgrewoutofatrainwhistle.Thenwewouldreadthemaloud.Attheendofthatschoolyearwetoowerechangingintosocialcreaturesandthestoriesandpoemsstopped. WhenIlivedforatimeinLondonIhadafriendhewasindespairandIwasindespair.Butourfriendshipwasbasedontheideaineachofusthatwewouldbesorrylaterifwedidnotexplorethisgreatcitybecausewehadfeltbadatthetime.WemeteverySundayforfiveweeksandfoundmanyexcellentthings.Wewalkeduntilourdespairsdisappearedandthenweparted.WegaveLondontoeachother. ForalmostfouryearsIhavehadremarkablefriendwhoseimaginationilluminatesmine.Wewritelonglettersinwhichweoftendiscoverourstrangestselves.Eachofusappearssometimesinafunnywayintheother’sdreams.SheandIagreethatatcertaintimesweseemtobepartsofthesamemind.InmymostinterestingmomentsIoftenthink:"YesImusttell..."Wehavenevermet. ItissuchcomfortingcompanionsIwishtokeep.Onebrighthourwiththeirkindisworthmoretomethanthelifetimeservicesofapsychologist心理学家whowillonlyfillupthehealingsilencenecessarytothosedarkestmomentsinwhichIwouldratherbemyownbestfriend. Intheeighthgradewhattheauthordidbeforedevelopingpropersocialbehaviorwasto.
德育方法很多榜样示范法是很重要的一种方法能体现这种方法的是
A近来你们学校正准备创建和申报省绿色学校请你据此给某英文报写一篇短文内容包括1建设绿色校园的重要性2绿色校园不仅是指绿色的环境3为了建设绿色校园我们应该注意1词数100左右2可以适当增加细节以使行文连贯3开头语已为你写好不计入总词数Recentlyourschoolisaimingatbuildingagreencampus.Whatisagreenschool
A Sincethe1970sscientistshavebeensearchingforwaystolinkthebrainwithcomputers.Brain-computerinterfaceBCItechnologycouldhelppeoplewithdisabilitiessendcommandstomachines. RecentlytworesearchersJoseMillanandMicheleTavellafromtheFederalPolytechnicschoolinLausanneSwitzerlanddemonstrated展示asmallroboticwheelchairdirectedbyaperson’sthoughts. InthelaboratoryTavellaoperatedthewheelchairjustbythinkingaboutmovinghisleftorrightband.Hecouldeventalkashewatchedthevehicleandguideditwithhisthoughts. "Ourbrainhasbillionsofnerveceils.Thesesendsignalsthroughthespinalcord脊髓tothemusclestogiveustheabilitytomove.Butspinalcordinjuriesorotherconditionscanpreventtheseweakelectricalsignalsfromreachingthemuscles"Tavellasays."Oursystemallowsdisabledpeopletocommunicatewithexternalworldandalsotocontroldevices." Theresearchersdesignedaspecialcapfortheuser.Thisheadcoverpicksupthesignalsfromthescalp头皮andsendsthemtoacomputer.Thecomputerinterpretsthesignalsandcommandsthemotorizedwheelchair.Thewheelchairalsohastwocamerasthatidentifyobjectsinitspath.Theyhelpthecomputerreacttocommandsfromthebrain. Prof.Millantheteamleadersaysscientistskeepimprovingthecomputersoftwarethatinterpretsbrainsignalsandturnsthemintosimplecommands."ThepracticalpossibilitiesthatBCItechnologyofferstodisabledpeoplecanbegroupedintwocategories:communicationandcontrollingdevices.Oneexampleisthiswheelchair." Hesayshisteamhassettwogoals.Oneistestingwithrealpatientssoastoprovethatthisisatechnologytheycanbenefitfrom.Andtheotheristoguaranteethattheycanusethetechnologyoverlongperiodsoftime. WhichofthefollowingshowsthepathofthesignalsdescribedinParagraph5
WhydoIwanttogotocollegeNoonehaseveraskedme 1 aquestion.ButmanytimesIhaveaskedmyself.Ihave2awholevarietyofreasons. 3importantreasonisthatIwanttobeabetterman.Manythingsmakehumanbeingsdifferent 4orbetterthanorevensuperiortoanimals.Oneofthemostimportantthingsis5.IfIfailtoreceivehighereducationmyeducation.6AsIwanttobeafully 7manImustgetawell-roundededucationwhichgoodcollegesanduniversitiesaresupposedto8.Iknowonecangeteducatedinmanywaysbutcollegesanduniversitiesare9thebestplacestoteachmehowtoeducatemyself.OnlywhenIamwell-educatedwillIbeabetterhumanbeingand10fitintosociety. 第1空应选择
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C WhenitcomestofriendsIdesirethosewhowillsharemyhappinesswhopossesswingsoftheirownandwhowillflywithme.Iseekfriendswhosequalitiesilluminatemeandtrainmeupforlove.ItisforthesepeoplethatIreservetheglowinghourstoogoodnottoshare. WhenIwasintheeighthgradeIhadafriend.Wewereshyand"tooserious"aboutourstudieswhenitwasbecomingfashionablewithourclassmatestolearnacceptablesocialbehaviors.WesaidlittleatschoolbutshewouldcometomyhouseandwewouldSitdownwithpencilsandpaperandoneofuswouldsay:"Let’sstartwithatrainwhistletoday."Wewouldsitquietlytogetherandwriteseparatepoemsorstoriesthatgrewoutofatrainwhistle.Thenwewouldreadthemaloud.Attheendofthatschoolyearwetoowerechangingintosocialcreaturesandthestoriesandpoemsstopped. WhenIlivedforatimeinLondonIhadafriendhewasindespairandIwasindespair.Butourfriendshipwasbasedontheideaineachofusthatwewouldbesorrylaterifwedidnotexplorethisgreatcitybecausewehadfeltbadatthetime.WemeteverySundayforfiveweeksandfoundmanyexcellentthings.Wewalkeduntilourdespairsdisappearedandthenweparted.WegaveLondontoeachother. ForalmostfouryearsIhavehadremarkablefriendwhoseimaginationilluminatesmine.Wewritelonglettersinwhichweoftendiscoverourstrangestselves.Eachofusappearssometimesinafunnywayintheother’sdreams.SheandIagreethatatcertaintimesweseemtobepartsofthesamemind.InmymostinterestingmomentsIoftenthink:"YesImusttell..."Wehavenevermet. ItissuchcomfortingcompanionsIwishtokeep.Onebrighthourwiththeirkindisworthmoretomethanthelifetimeservicesofapsychologist心理学家whowillonlyfillupthehealingsilencenecessarytothosedarkestmomentsinwhichIwouldratherbemyownbestfriend. Accordingtoparagraph4theauthorandherfriend.
B WhenIwassixDadbroughthomeadogonedaywhowascalled"Brownie".MybrothersandIalllovedBrownieanddiddifferentthingswrithher.OneofuswouldwalkheranotherwouldfeedherthentherewerebathsplayingcatchandmanyothergamesBrownieinreturnlovedeachandeveryoneofus.Onethingthatmosttouchedmyheartwasthatshewouldgotowhoeverwassickandjustbewiththemwealwaysfeltbetterwhenshewasaround. OnedayasIwasgettingherfoodshecheweduponeofDad’sshoeswhichhadtobethrownawayintheend.IknewDadwouldbemadandIhadtoletherknowwhatshedidwaswrong.WhenIlookedatherandsaid"Badgirl"shelookeddownatthegroundandthenwentandhide.Isawatearinhereyes. Brownieturnedouttobemorethanjustourfamilypetshewenteverywherewithus.Peoplewouldstopandaskiftheycouldpether.Ofcourseshe’dletanyonepether.Shewasjustthemostlovabledog.Thereweremanytimeswhenwe’dbeoutwalkingandasmallchildwouldcomeoverandpullonherhair.Sheneverbarkedortriedtogetaway.Funnythingisshewouldsmile.Thisfrightenedpeoplebecausetheythoughtshewasshowingherteeth.Farfromthetruthshelovedeveryone. NowmanyyearshavepassedsinceBrowniediedofoldage.Istillmissdayswhenshewaswithus. WecaninferfromParagraph2thatBrownie
D DianaJacobsthoughtherfamilyhadaworkableplantopayforcollegeforher21-year-oldtwinsons:acombinationofsavingsincomescholarshipsandamodestamountofborrowing.Thenherhusbandlosthisjobandtheplanfellapart. "IhavetwokidsincollegeandIwanttosay’comehome’butatthesametimeIwanttoprovidethemwithagoodeducation"saysJacobs. TheJacobsfamilydidworkoutasolution:Theyaskedandreceivedmoreaidformtheschoolsandeachsonincreasedhisborrowingtothemaximumamountthroughthefederalloan贷款program.Theywilleachgraduatewith$20000ofdebtbutatleasttheywillbeabletofinishschool. WithunemploymentrisingfinancialaidadministratorsexpecttohearmorefamiliesliketheJacobs.Morestudentsareapplyingforaidandmorefamiliesexpecttoneedstudentloans.Collegeadministratorsareconcernedthattheywillnothaveenoughaidmoneytogoaround. Atthesametimetuition学费continuestorise.AreportfromtheNationalCenterforPublicPolicyandHigherEducationfoundthatcollegetuitionandfeesincreased439%from1982to2007whileaveragefamilyincomerosejust147%.Studentborrowinghasmorethandoubledinthelastdecade. "Ifwegoonthiswayforanother25yearswewon’thaveanaffordablesystemofhighereducation"saysPatrickM.Callanpresidentofthecenter."Themiddleclassfamilieshavebeenfinancingitthroughdebt.Theywillsendkidstocollegewhateverittakesevenifthatmeansahugeamountofdebt." Financialaidadministratorshavebeenhavingahardtimeasmanycompaniesdecidethatstudentloansarenotprofitableenoughandhavestoppedmakingthem.Thegoodnewshoweveristhatfederalloansaccountforaboutthreequartersofstudentborrowingandthegovernmentsaysthatmoneywillflowuninterrupted. Whatcanwelearnaboutthemiddleclassfamiliesfromthetext
A Sincethe1970sscientistshavebeensearchingforwaystolinkthebrainwithcomputers.Brain-computerinterfaceBCItechnologycouldhelppeoplewithdisabilitiessendcommandstomachines. RecentlytworesearchersJoseMillanandMicheleTavellafromtheFederalPolytechnicschoolinLausanneSwitzerlanddemonstrated展示asmallroboticwheelchairdirectedbyaperson’sthoughts. InthelaboratoryTavellaoperatedthewheelchairjustbythinkingaboutmovinghisleftorrightband.Hecouldeventalkashewatchedthevehicleandguideditwithhisthoughts. "Ourbrainhasbillionsofnerveceils.Thesesendsignalsthroughthespinalcord脊髓tothemusclestogiveustheabilitytomove.Butspinalcordinjuriesorotherconditionscanpreventtheseweakelectricalsignalsfromreachingthemuscles"Tavellasays."Oursystemallowsdisabledpeopletocommunicatewithexternalworldandalsotocontroldevices." Theresearchersdesignedaspecialcapfortheuser.Thisheadcoverpicksupthesignalsfromthescalp头皮andsendsthemtoacomputer.Thecomputerinterpretsthesignalsandcommandsthemotorizedwheelchair.Thewheelchairalsohastwocamerasthatidentifyobjectsinitspath.Theyhelpthecomputerreacttocommandsfromthebrain. Prof.Millantheteamleadersaysscientistskeepimprovingthecomputersoftwarethatinterpretsbrainsignalsandturnsthemintosimplecommands."ThepracticalpossibilitiesthatBCItechnologyofferstodisabledpeoplecanbegroupedintwocategories:communicationandcontrollingdevices.Oneexampleisthiswheelchair." Hesayshisteamhassettwogoals.Oneistestingwithrealpatientssoastoprovethatthisisatechnologytheycanbenefitfrom.Andtheotheristoguaranteethattheycanusethetechnologyoverlongperiodsoftime. BCIisatechnologythatcan.
WhydoIwanttogotocollegeNoonehaseveraskedme 1 aquestion.ButmanytimesIhaveaskedmyself.Ihave2awholevarietyofreasons. 3importantreasonisthatIwanttobeabetterman.Manythingsmakehumanbeingsdifferent 4orbetterthanorevensuperiortoanimals.Oneofthemostimportantthingsis5.IfIfailtoreceivehighereducationmyeducation.6AsIwanttobeafully 7manImustgetawell-roundededucationwhichgoodcollegesanduniversitiesaresupposedto8.Iknowonecangeteducatedinmanywaysbutcollegesanduniversitiesare9thebestplacestoteachmehowtoeducatemyself.OnlywhenIamwell-educatedwillIbeabetterhumanbeingand10fitintosociety. 第3空应选择
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WhydoIwanttogotocollegeNoonehaseveraskedme 1 aquestion.ButmanytimesIhaveaskedmyself.Ihave2awholevarietyofreasons. 3importantreasonisthatIwanttobeabetterman.Manythingsmakehumanbeingsdifferent 4orbetterthanorevensuperiortoanimals.Oneofthemostimportantthingsis5.IfIfailtoreceivehighereducationmyeducation.6AsIwanttobeafully 7manImustgetawell-roundededucationwhichgoodcollegesanduniversitiesaresupposedto8.Iknowonecangeteducatedinmanywaysbutcollegesanduniversitiesare9thebestplacestoteachmehowtoeducatemyself.OnlywhenIamwell-educatedwillIbeabetterhumanbeingand10fitintosociety. 第9空应选择
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Allofthefollowingarewell-knownfemalewritersin20th-centuryBritainexcept.
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WhydoIwanttogotocollegeNoonehaseveraskedme 1 aquestion.ButmanytimesIhaveaskedmyself.Ihave2awholevarietyofreasons. 3importantreasonisthatIwanttobeabetterman.Manythingsmakehumanbeingsdifferent 4orbetterthanorevensuperiortoanimals.Oneofthemostimportantthingsis5.IfIfailtoreceivehighereducationmyeducation.6AsIwanttobeafully 7manImustgetawell-roundededucationwhichgoodcollegesanduniversitiesaresupposedto8.Iknowonecangeteducatedinmanywaysbutcollegesanduniversitiesare9thebestplacestoteachmehowtoeducatemyself.OnlywhenIamwell-educatedwillIbeabetterhumanbeingand10fitintosociety. 第7空应选择
D DianaJacobsthoughtherfamilyhadaworkableplantopayforcollegeforher21-year-oldtwinsons:acombinationofsavingsincomescholarshipsandamodestamountofborrowing.Thenherhusbandlosthisjobandtheplanfellapart. "IhavetwokidsincollegeandIwanttosay’comehome’butatthesametimeIwanttoprovidethemwithagoodeducation"saysJacobs. TheJacobsfamilydidworkoutasolution:Theyaskedandreceivedmoreaidformtheschoolsandeachsonincreasedhisborrowingtothemaximumamountthroughthefederalloan贷款program.Theywilleachgraduatewith$20000ofdebtbutatleasttheywillbeabletofinishschool. WithunemploymentrisingfinancialaidadministratorsexpecttohearmorefamiliesliketheJacobs.Morestudentsareapplyingforaidandmorefamiliesexpecttoneedstudentloans.Collegeadministratorsareconcernedthattheywillnothaveenoughaidmoneytogoaround. Atthesametimetuition学费continuestorise.AreportfromtheNationalCenterforPublicPolicyandHigherEducationfoundthatcollegetuitionandfeesincreased439%from1982to2007whileaveragefamilyincomerosejust147%.Studentborrowinghasmorethandoubledinthelastdecade. "Ifwegoonthiswayforanother25yearswewon’thaveanaffordablesystemofhighereducation"saysPatrickM.Callanpresidentofthecenter."Themiddleclassfamilieshavebeenfinancingitthroughdebt.Theywillsendkidstocollegewhateverittakesevenifthatmeansahugeamountofdebt." Financialaidadministratorshavebeenhavingahardtimeasmanycompaniesdecidethatstudentloansarenotprofitableenoughandhavestoppedmakingthem.Thegoodnewshoweveristhatfederalloansaccountforaboutthreequartersofstudentborrowingandthegovernmentsaysthatmoneywillflowuninterrupted. HowdidtheJacobsmanagetosolvetheirproblem
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C WhenitcomestofriendsIdesirethosewhowillsharemyhappinesswhopossesswingsoftheirownandwhowillflywithme.Iseekfriendswhosequalitiesilluminatemeandtrainmeupforlove.ItisforthesepeoplethatIreservetheglowinghourstoogoodnottoshare. WhenIwasintheeighthgradeIhadafriend.Wewereshyand"tooserious"aboutourstudieswhenitwasbecomingfashionablewithourclassmatestolearnacceptablesocialbehaviors.WesaidlittleatschoolbutshewouldcometomyhouseandwewouldSitdownwithpencilsandpaperandoneofuswouldsay:"Let’sstartwithatrainwhistletoday."Wewouldsitquietlytogetherandwriteseparatepoemsorstoriesthatgrewoutofatrainwhistle.Thenwewouldreadthemaloud.Attheendofthatschoolyearwetoowerechangingintosocialcreaturesandthestoriesandpoemsstopped. WhenIlivedforatimeinLondonIhadafriendhewasindespairandIwasindespair.Butourfriendshipwasbasedontheideaineachofusthatwewouldbesorrylaterifwedidnotexplorethisgreatcitybecausewehadfeltbadatthetime.WemeteverySundayforfiveweeksandfoundmanyexcellentthings.Wewalkeduntilourdespairsdisappearedandthenweparted.WegaveLondontoeachother. ForalmostfouryearsIhavehadremarkablefriendwhoseimaginationilluminatesmine.Wewritelonglettersinwhichweoftendiscoverourstrangestselves.Eachofusappearssometimesinafunnywayintheother’sdreams.SheandIagreethatatcertaintimesweseemtobepartsofthesamemind.InmymostinterestingmomentsIoftenthink:"YesImusttell..."Wehavenevermet. ItissuchcomfortingcompanionsIwishtokeep.Onebrighthourwiththeirkindisworthmoretomethanthelifetimeservicesofapsychologist心理学家whowillonlyfillupthehealingsilencenecessarytothosedarkestmomentsinwhichIwouldratherbemyownbestfriend. Whatisthebesttitleforthepassage
B WhenIwassixDadbroughthomeadogonedaywhowascalled"Brownie".MybrothersandIalllovedBrownieanddiddifferentthingswrithher.OneofuswouldwalkheranotherwouldfeedherthentherewerebathsplayingcatchandmanyothergamesBrownieinreturnlovedeachandeveryoneofus.Onethingthatmosttouchedmyheartwasthatshewouldgotowhoeverwassickandjustbewiththemwealwaysfeltbetterwhenshewasaround. OnedayasIwasgettingherfoodshecheweduponeofDad’sshoeswhichhadtobethrownawayintheend.IknewDadwouldbemadandIhadtoletherknowwhatshedidwaswrong.WhenIlookedatherandsaid"Badgirl"shelookeddownatthegroundandthenwentandhide.Isawatearinhereyes. Brownieturnedouttobemorethanjustourfamilypetshewenteverywherewithus.Peoplewouldstopandaskiftheycouldpether.Ofcourseshe’dletanyonepether.Shewasjustthemostlovabledog.Thereweremanytimeswhenwe’dbeoutwalkingandasmallchildwouldcomeoverandpullonherhair.Sheneverbarkedortriedtogetaway.Funnythingisshewouldsmile.Thisfrightenedpeoplebecausetheythoughtshewasshowingherteeth.Farfromthetruthshelovedeveryone. NowmanyyearshavepassedsinceBrowniediedofoldage.Istillmissdayswhenshewaswithus. SomepeoplegotfrightenedbyBrowniewhenshe.
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WhydoIwanttogotocollegeNoonehaseveraskedme 1 aquestion.ButmanytimesIhaveaskedmyself.Ihave2awholevarietyofreasons. 3importantreasonisthatIwanttobeabetterman.Manythingsmakehumanbeingsdifferent 4orbetterthanorevensuperiortoanimals.Oneofthemostimportantthingsis5.IfIfailtoreceivehighereducationmyeducation.6AsIwanttobeafully 7manImustgetawell-roundededucationwhichgoodcollegesanduniversitiesaresupposedto8.Iknowonecangeteducatedinmanywaysbutcollegesanduniversitiesare9thebestplacestoteachmehowtoeducatemyself.OnlywhenIamwell-educatedwillIbeabetterhumanbeingand10fitintosociety. 第5空应选择
A Sincethe1970sscientistshavebeensearchingforwaystolinkthebrainwithcomputers.Brain-computerinterfaceBCItechnologycouldhelppeoplewithdisabilitiessendcommandstomachines. RecentlytworesearchersJoseMillanandMicheleTavellafromtheFederalPolytechnicschoolinLausanneSwitzerlanddemonstrated展示asmallroboticwheelchairdirectedbyaperson’sthoughts. InthelaboratoryTavellaoperatedthewheelchairjustbythinkingaboutmovinghisleftorrightband.Hecouldeventalkashewatchedthevehicleandguideditwithhisthoughts. "Ourbrainhasbillionsofnerveceils.Thesesendsignalsthroughthespinalcord脊髓tothemusclestogiveustheabilitytomove.Butspinalcordinjuriesorotherconditionscanpreventtheseweakelectricalsignalsfromreachingthemuscles"Tavellasays."Oursystemallowsdisabledpeopletocommunicatewithexternalworldandalsotocontroldevices." Theresearchersdesignedaspecialcapfortheuser.Thisheadcoverpicksupthesignalsfromthescalp头皮andsendsthemtoacomputer.Thecomputerinterpretsthesignalsandcommandsthemotorizedwheelchair.Thewheelchairalsohastwocamerasthatidentifyobjectsinitspath.Theyhelpthecomputerreacttocommandsfromthebrain. Prof.Millantheteamleadersaysscientistskeepimprovingthecomputersoftwarethatinterpretsbrainsignalsandturnsthemintosimplecommands."ThepracticalpossibilitiesthatBCItechnologyofferstodisabledpeoplecanbegroupedintwocategories:communicationandcontrollingdevices.Oneexampleisthiswheelchair." Hesayshisteamhassettwogoals.Oneistestingwithrealpatientssoastoprovethatthisisatechnologytheycanbenefitfrom.Andtheotheristoguaranteethattheycanusethetechnologyoverlongperiodsoftime. Whichofthefollowingwouldbethebesttitleforthetext
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