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现有一量程为3V的电压表,内阻约为6000Ω.为了较准确地测量其内阻,某同学设计了如图甲所示的实验电路,按此电路可以测出电压表的内阻.(1)试根据图甲所示的电路图,补充完成图乙所示的实物图的连线.(...
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一个未知电阻R.阻值大约为为了较为准确地测定其电阻值实验室中有如下器材电压表V.1量程3V内阻约为3
一个未知电阻Rx阻值大约为10kΩ~20kΩ为了较为准确地测定其电阻值实验室中有如下器材电压表V1量
在测定一节干电池电动势约为1.5V内阻约为2Ω的电动势和内阻的实验中变阻器和电压表各有两个供选A.电
用伏安法测量某一电阻Rx阻值现有实验器材如下待测电阻Rx阻值约5Ω额定功率为1W.电流表A.1量程0
某电压表V.量程3V内阻约为2k为了检测其表盘读数是否准确并确定其内阻的准确阻值实验室提供器材如下A
为了测量量程为3V的电压表V1的内阻RV内阻约3000Ω实验室可以提供的器材有电流表A1量程为3A内
测量一量程已知的电压表的内阻器材如下A.待测电压表量程3V内阻约3KΩB.电流表量程3A内阻为0.0
某同学要测量一个额定功率为1W.阻值约为5Ω的导体的电阻率实验室中现有如下实验器材蓄电池E.电动势约
现用伏安法较准确的测一个阻值约为30KΩ的电阻可供选用的实验仪器有A.电源电动势3V内阻0.5ΩB.
在测一节干电池电动势约为1.5V.内阻约为2Ω的电动势和内阻的实验中变阻器和电压表各有两个供选电压表
有一个待测电阻Rx约5Ω现欲比较精确地测定其阻值.除待测电阻外备用器材及规格如下请选择适当的器材设计
为测量一电源的电动势及内阻在下列三个电压表中选一个改装成量程为9V的电压表A.量程为1V内阻大约为1
某同学用伏安法测量一个额定功率为1W阻值约为5Ω的电阻Rx实验室中现有如下实验器材A.电流表A1量程
一个未知电阻Rx阻值大约为10kΩ﹣20kΩ为了较为准确地测定其电阻值实验室中有如下器材电压表V1量
某同学用伏安法测量一个额定功率为1W阻值约为5Ω的电阻R.x.实验室中现有如下实验器材A.电流表A.
现用伏安法较准确的测一个阻值约为30KΩ的电阻可供选用的实验仪器有A.电源电动势3V内阻0.5ΩB.
为了测量一个量程已知的电压表内阻实验室提供如下器材A.待测电压表量程3V内阻约3KΩB.电流表量程3
9分现提供以下器材①电压表V1量程6V内阻约为30kΩ②电压表V2量程3V内阻约为3kΩ③电池E.电
某一阻值不变的纯电阻元件阻值Rx约100Ω额定功率为0.25w要用伏安法较准确地测量它的阻值实验器材
一个未知电阻Rx阻值大约为10kΩ﹣20kΩ为了较为准确地测定其电阻值实验室中有如下器材电压表V1量
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圆ρ=5cosθ﹣5sinθ的圆心坐标是
7.5分VisitorstoBritainmayfindthebestplacetosamplelocalcultureisinatraditionalpub.Butthesefriendlypubscanbedangerousplacesofpotentialgaffes失礼forthenewcomers. AteamofresearchershavediscoveredsomeoftheunknowncustomsofBritishpub﹣startingwiththedifficultyofgettingadrink.Mostpubshavenowaiters﹣youhavetogotothebartobuydrinks.AgroupofItalianyouthswaiting45minutesbeforetheyrealizedtheywouldhavetofetchtheirown.Thismaysoundinconvenientbutthereisahiddenpurpose. Pubcultureisdesignedtopromotesociabilityinasocietyknownforitsreserve.Standingatthebarforserviceallowsyoutochatwithotherswaitingtobeserved.ThebarcounterispossiblytheonlysiteintheBritishIslesinwhichfriendlyconversationwithstrangersisconsideredentirelysuitableandreallyquitenormalbehavior.Ifyouhaven'tbeentoapubyouhaven'tbeentoBritain.ThistipcanbefoundinabookletPassporttothePubTheTourists'GuidetoPubEtiquetteacustomers'ruleofconductforthosewantingtosampleacentralpartofBritishlifeandculture. Thetroubleisthatifyoudonotfollowthelocalrulestheexperiencemayfallflat.Forexampleifyouareinabiggroupitisbestifonlyoneortwopeoplegotobuythedrinks.Nothingannoystheregularcustomersandbarstaffmorethanagroupofstrangersblockingallaccesstothebarwhiletheychatandhesitateaboutwhattoorder. 1Theunderlinedwordsampleinthefirstparagraphprobablymeans. A.taste B.experience C.test D.record 2ThecultureofpubinBritainissodevelopedto. A.encouragepeopletocommunicatewitheachother B.encouragemorepeopletoconsumedrinks C.attractmoretouriststothepubs D.formitsowncharacterofculture 3WhatdoestheauthormeanbygivingtheexampleofagroupofItalianyouthsinParagraph2? A.Britishpubsdon'talwayshavewaitersorwaitresses. B.ThereisalwaysahiddenpurposeinmostBritishpubs. C.ItisquiteconvenientforpeopletogetadrinkinBritishpubs. D.NotknowingthecustomofBritishpubsmaycauseinconvenience.
如图是某超市一年中各月份的收入与支出单位万元情况的条形统计图.已知利润为收入与支出的差即利润=收入一支出则下列说法正确的是
7.5分GivenachoicewouldThreeLittleRobotsbeingchasedbyabigbadwolfAbuildsuccessivelymorewolf﹣resistanthousesorBkillthewolfwiththeirnailgun?IfyouchoseByouareprobablyarobotwhohasn'tyetmetQuixotealearningsystemthatteachesrobotshownottokillbyusingfairytales. WhileStephenHawkingElonMuskandBillGatestrytoscareuswithtalesofrobotskillinghumansateamofresearchersatGeorgiaInstituteofTechnologyisscaringrobotsbyusingfairytalestoteachthemhowtomakeproperdecisionswhenfacedwithreal﹣worlddilemmaswhilelackingamoral道德的compass.Theysuggestrobotscanbetaughtmoralbehaviorusingbooks.Readingfairytalesorstoriescanhelpthemlearnwhatisgoodandbadandhowtobehavewellinasociety. Fables寓言fromvariousculturescanprovideartificialintelligencewithsocialskillsandrolemodelsessentialtothepeacefulcoexistenceofmenandrobotsscientistatGeorgiaInstituteofTechnologyclaiminanewstudy. Accordingtoresearcherstomakearobotunderstandtheactionsofahumanitmustfirstturnedthemorallessonscontainedinfablesintoaspeciallydesignedarchitectureofareasoningcompatiblewithartificialintelligence. AnearlyexampleofthisreasoningisasystemcalledQuixotenamedfortheleadingcharacterofMigueldeCervantes'classicnovel.Quixoteusesfableplotstogivemachineintelligenceguidanceformoralproblem﹣solvinganddependingonwhatdeedscharactersengageinthesystemsendseitherrewardorpunishmentsignalscausingrobotstoactmorehumanelyresearcherssuggest. ThefunctionofQuixoteisdependentuponanothersystemcalledScheherazadeapreviousprojectstartedbythesameteam.ScheherazadecollectsdifferentstoryplotsfromInternetanddevelopsinteractivestories.Thosestoriesarethenturnedintodecisionflow﹣chartsprovidingahugenumberofbranchingpathsfollowingeverysteptaken. Quixoteisintheearlydevelopmentstageaccordingtoresearchersnotingthatitworkscurrentlywithrobotsthatinteractwithhumansinonlyaverysmallrangeoffunction. 1Whatcanweinferfromparagraph1? A.Robotsareafraidofwolves. B.Robotsarefondoffairytales. C.Robotsareadvancing. D.Robotsareconstantlygivenchoices. 2Whatshouldprobablyhappenifatestedrobotchosetocutinlineinpublicplaces? A.ItwouldbepunishedbyScheherazade. B.Itwouldapologize. C.Itwouldreasonwithhumanbeings. D.Itwouldberebuilt. 3WhichofthefollowingbestdescribethefunctionofQuixote? A.QuixotemakesfablesmeaningfultoA.L. B.Quixotegivesrobotsintelligence. C.QuixotecollectsstoriesfromInternet. D.Quixoteisanindependentsystem.
雷达图RadarChart又可称为戴布拉图蜘蛛网图SpiderChart是财务分析报表的一种现可用于对研究对象的多维分析如图为甲乙两人五个方面的数据雷达图则下列说法不正确的是
已知点27在幂函数fx=t﹣2xa的图象上则t+a=
用反证法证明命题三角形的内角至少有一个角不大于60°时应假设
集合{abc}={123}现有甲乙丙三人分别对abc的值给出了预测甲说a≠2乙说b=2丙说c≠3.已知三人中有且只有一个人预测正确那么100a+10b+c=.
Fatherwasdiagnosedwithbraincancerduringthesecondhalfofmysenioryear.Itisatimewhenallthebigeventsinagirl'slifearehappening.Howeverthoughinpoorconditionfathermanagedtobepresentateveryoccasion.Hisdoctorsaidthatbyfocusingonallmyfutureeventsithelpedmydadlivelonger.Iguesssobecauseninedaysaftermyhighschoolgraduationmyfatherdied. ForthenextweekafterhisfuneralIdidn'tleavemyroomoreventoshower.FinallymymomstormedinandsaidMegangetup.Ihavesomethingforyoutoread.''Myfather'sdoctorhadsentmymotheraletter.ItcontainedthetypicalIamsorryforyourlosssentences.ButthisletterwasfarfromtypicalIcouldphysicallyseethepainthislosshadcausedhim.Inhisletterhewroteabouthowmyfatherinspiredhimtochangehislifeandthewayheworked.Heexpressedhisdesiretobecomeapersonlikemyfatherwhocaredmoreforthepeoplearoundhimandputeveryoneelsefirst. AfterIfinishedreadingitIdecidedtolivemylife.Iwentoutsideandgotajobasasummercampadvisor.Iworkedfromdawntodarkeverydaythatsummer.IgaveeverythingIhadtothekidsandslowlytheyhelpedtoheal治愈mewithoutevenrealizingwhattheyweredoing Mysummermirroredpartsofthelifemyfatherledinhislastfewdays.Ihadspentthesummermonthsgivingmyselftochildren.ItwasnottheseniorsummerIhadalwaysimagined.Itwasn'tallaboutme.Ihadlearnedthefinallessonmyfatherwasteachingmethatinordertoleadarichandhappylifeyoumustlearnhowtogiveyourselftoothers.Byhelpingthemyoureallyarehelpingyourself. 1Thedoctorsenttheauthorsmotheralettermainlyto. A.showtypicalconcernforherfamily B.encouragehertoliveahappylife C.mournherhusband'sdeath D.appreciateherhusband'sinfluenceonhim 2Whatdoweknowabouttheauthor'sseniorsummer? A.Shespentitthewayshehadalwayswanted. B.Sheworkedhardeverydaytoforgetherpain C.Shegainedquitealotwhilehelpingthekids. D.Shegotajobasherfatherhadexpected 3Whichwordcanbestdescribetheauthor'sfather? A.Selfless. B.Cautious C.Fearless D.Wise. 4Whichofthefollowingcouldbethebesttitleforthepassage? A.Dad'sfinallesson B.Myseniorsummer C.Myfather'sdeath D.Animportantletter
在直角坐标系xOy中直线l的参数方程为t为参数曲线C的参数方程为α为参数. Ⅰ已知在极坐标系与直角坐标系xOy取相同的长度单位且以原点O为极点以x轴正半轴为极轴中点P的极坐标为3判断点P与直线l位置关系 Ⅱ设点Q是曲线C上的一个动点求它到直线l的距离的最小值.
设fx=3ax2+2bx+c若a+b+c=0f0>0f1>0. 求证a>0.
论语•学路篇中说“名不正则言不顺言不顺则事不成事不成则礼乐不兴礼乐不兴则刑罚不中刑罚不中则民无所措手足所以名不正则民无所措手足.”上述推理用的是
在吸烟与患肺病这两个分类变量的计算中下列说法正确的是
Iwearcontacts隐形眼镜.SometimesIbringmyglassestoworkasabackup备份incasemyeyestiredout.InterestinglyonthedayswhenIbroughtmyglassesIalwaysneededthem.WhenmyglassesstayedathomeIneverfelttheurgetoremovemycontacts.Backupplanslikemyglassescanhaveunexpectedinfluencesonourbehavior.Thiseffectcanbepositivebutbackupplanscanalsodestroypursuit追求ofyourgoals Buthowcanabackupplancausefailure?Imaginebeingonthejobmarket.PlanAistoworkforatechfirm.Youknowgettinghiredthereisachallengesoyou'vemadeabackupplanabankingpositionDoesyourbankingbackupplanhelporharmyourchancesofgettingajob? Therearetwokindsofbackupplans.Oneisbasedaroundapossibleemergency﹣﹣ifplanAdoesnotworkthenusePlanB.SothejobseekermightsimplysubstitutePlanBifPlanAfails.HoweverPlanBmightbeuselessifyoudon'thaveenoughtimetoprepareforthebankingpositionafterbadnewsfromthetechfirm. Theotherkindofbackupplansaredifferent.PeopletakePlanAwhileactivelycomparingPlanAandPlanB.Forourjobseekerthatwouldmeanpreparingforbothinterviewsatthesametime. Thesecondkindofbackupplansintroducegreaterchallengesandarecostliertouse.OnemustactivelycomparePlansAandBallthetime.Youcouldputsomuchworkintothebackupplanthatyoucompromiseyourchanceforsecuringtheprimarygoal.Forthejobseekeractivelycomparingthetechandbankoptionsmightresultinunder﹣preparingorbothinterviews. Sowhatmakesagoodbackupplan?Backupplanschangethewaygoalsarepursuedsometimesfortheworse.AsyouthinkaboutyourownPlanBconsiderhowitisaffectingPlanA.Forwhatit'sworthIamsittinginmyofficewhilemyglassesaresafelyathome.Risky?Perhaps.Butmyeyesfeelfresh. 1Theauthormentionedtheglassesto. A.introducethetopic B.amusethereader C.presentthebackground D.explainthephenomenon 2Whichofthefollowingisthedisadvantageofthesecondkindofbackupplan? A.PlanBmighthavealotofchallenges. B.PlanBmightcostmuchtimeandenergy. C.Jobseekersmightfallintoadilemmasituation. D.Jobseekersmaynotbewellprepared. 3Whatisthemainideaofthepassage? A.Backupplansmightbeharmful. B.Backupplansareimportant. C.Backupplansmightbeimproper. D.Backupplansareofdifferentkinds 4Theauthordevelopsthepassagemainlyby. A.listingsomeexamples B.followingthetimeorder C.comparingdifferentideas D.analyzingcausesandeffects
已知集合A={x|lgx﹣2<1}集合B={x|x2﹣2x﹣3<0}则A∪B等于
将十进制数37化为二进制数根据二进制数“满二进一”的原则采用“除二取余法”得如下过程37=2×18+118=2×9+09=2×4+14=2×2+02=2×1+0把以上各步所得余数从后面到前面依次排列从而得到37的二进制数为100101记作372=100101类比上述方法根据三进制数“满三进一”的原则则583=
已知复数z=x2﹣1+x2﹣x﹣2i为纯虚数则实数x=
在同一平面直角坐标系中满足由曲线x2+y2=1变成曲线的一个伸缩变换为
已知复数z1=在复平面内对应的点为A复数z2在复平面内对应的点为B若向量与虚轴垂直则z2的虚部为.
At200amthisFridaymorningIreceivedatextmessagefromafriendaskingifIhadanySmileCardsinSpanish.Iimmediately1thatIdidn'thaveany.HoweverIaskedherwhyshewantedthem2inSpanishandifSmileCardsinEnglishwouldbe3. Tomy4shesaidshehadbeenoneofthefewselectedbyherhighschooltogoonaservicetriptoPanama.ShewantedtosharetheconceptofSmileCardsand5. Withchildreninthevillages.Iwastotally6andexcitedwithhearingthenews!SoIdecidedtostop7andcallhertogetmoreinformationaboutherservicetrip.Shewasleavingthatsamedayatmidnight.ItoldherIwould8aboutitandletherknowbyafternoonifIcould9anyinSpanish.Nolucktillmidday. 10therewasonetranslationoftheoriginalEnglishSmileCardinSpanishonline.Carryingthe11Iheadedovertoalocalprintingshopandaskedtheemployeeifhecouldprint100SmilecardsinSpanishby600pm.Theemployeesaiditwas12togetitsincehewasworkingbyhimselfandwas13withorders.DisappointedI14theEnglishversionoftheSmileCardandexplainedmy15tohim.Evenhewasexcitedandpromisedthathe'dtryhisbesttogetthem16. Whentheclock17ninetheSpanishSmileCardswereready.ToexpressmygratitudeIbroughtsomeIndianfoodtothisemployeetothankhimforhis18.Iquicklygotinto19mycarandmyfiend'shouseandshewaspatientlystandingoutsideawaitingmy20.Wedidn'tgetachancetohaveaproperconversationbutthatwasgoodenough. 1A.believed B.imagined C.responded D.noticed 2A.specially B.universally C.frequently D.officially 3A.accurate B.acceptable C.valuable D.flexible 4A.surprise B.puzzle Cdisappointment D.amusement 5A.solution B.amazement C.curiosity D.kindness 6A.confused B.rocked C.concerned D.satisfied 7A.talking B.travelling C.discussing D.texting 8A.worry B.bargain C.enquire D.quarrel 9A.takechargeof B.search C.control D.getholdof 10AStrangely B.Fortunately C.Obviously D.Hopefully 11A.excitement B.dream C.courage D.doubt 12A.necessary B.worthwhile C.impossible D.natural 13A.pleased B.curious C.occupied D.nervous 14A.tookout B.gaveout C.madeup D.usedup 15A.identity B.situation C.concept D.difficulty 16A.designed B.decorated C.written D.printed 17A.recorded B.exposed C.struck D.shook 18A.commitment B.judgement C.encouragement D.assessment 19A.steppedforward B.heldon C.showedup D.spedoff 20Aapology B.arrival C.explanation D.participation
假定你是高一的李华得知第七届世界军人运动会the7thCISMWorldGames将于2019年10月18日至27日在中国湖北武汉举行.请写一封信申请去做志愿者volunteer内容包括 1写信目的 2个人优势 3能做的事. 注意 1词数100左右 2可以适当增加细节以使行文连贯 3申请信的开头已给出不计入字数. DearSir/Madam IamLiHuaastudentstudyinginakeymiddleschool.
下列命中①若实数a>b则a+i>b+i②由圆的性质类比出球的性质是合情推理③在回归直线方程=﹣0.2x+11中当变量x每增加一个单位时变量一定减少0.2单位④相关系数r越大则两个变量相关性越强.正确的个数是
执行如图所示的程序框图如果输出的a值大于2019那么判断框内的条件为
Iamoftenaskedwhyreadingissoimportant.Icouldn'thelpbutquote引用TyrionLannisterfromthebook‘Gameofthrones'writtenbyGeorgeRRMartin.ThisconversationfollowswhenTyrionwasaskedwhyhereadssomuch Ihavearealisticgraspofmyown1andweaknesses.Mymindismy2.MybrotherhashisswordKingRoberthashiswarhammer战锤andIhavemymind…andamindneedsbooks3aswordneedsawhetstone磨石ifitistokeepthesword4.Tyriontappedtheleathercoverofthebook.That'swhyIreadso5JonSnow. ToquoteGeorgeRRMartinAreaderlivesathousandlivesbeforehedies.Themanwhoneverreadslivesonly6. Anoldfarmerlivedonafarminthemountainswithhisyounggrandson.EachmorningGrandpawasupearlysitting7thekitchentablereadinghisbook.Onedaythegrandsonasked‘Grandpa!ItrytoreadthebookjustlikeyoubutIdon't8itandwhatIdounderstandIforget9Iclosethebook.Whatgooddoesreadingthebookdo?' Thegrandfatherquietly10andrepliedTakethiscoalbasketdowntotheriverandbringmebackabasketof11. Theboydidashewastoldbutallthewater12beforehegotbacktothehouse.ThegrandfatherlaughedandsaidYou'llhavetomovealittlefasternexttimeand13himtotheriverwiththebaskettotryagain.Thistimetheboyranfasterbutagainthebasketwasemptybeforehereturnedhome.Outof14hetoldhisgrandfatherthatitwasimpossibletocarrywaterinabasketandhewenttogetabucket15.TheoldmansaidIdon'twantabucketofwaterIwantabasketofwater.You'rejustnottryinghardenoughandhewentoutthedoortowatchtheboytryagain.Atthispointtheboyknewitwas16buthewantedtoshowhisgrandfatherthatevenifheranasfastashecouldthewaterwouldleakoutbeforehegotbacktothehouse.Theboyagaindippedthebasketintotheriverandranhardbutwhenhe17hisgrandfatherthebasketwasagainempty.HesaidSeeGrandpait's18! Soyouthinkitisuseless?theoldmansaidLookatthebasket.Theboylookedatthebasketandforthefirsttimerealizedthatthebasketwas19.Ithadbeentransformedfromadirtyoldcoalbasketandwasnowcleaninsideandout. Sonthat'swhathappenswhenyoureadthebook.Youmightnotunderstandorremembereverythingbutwhenyoureadityouwillbechangedinsideand20!!! 1A.wisdom B.strengths C.shortcomings D.disadvantages 2A.tool B.weapon C.equipment D.instrument 3A.as B.before C.while D.because 4A.fast B.sharp C.smooth D.important 5A.few B.much C.little D.many 6A.it B.one C.that D.those 7A.at B.down C.along D.besides 8A.confirm B.believe C.understand D.convince 9A.quickly B.finally C.immediately D.frequently 10A.turnedup B.turnedout C.turnedaway D.turnedaround 11A.fish B.coal C.earth D.water 12A.wentout B.flewout C.droppedout D.leakedout 13A.sent B.asked C.ordered D.required 14A.breath B.control C.curiosity D.consideration 15A.even B.though C.instead D.however 16A.hopeful B.necessary C.impossible D.important 17A.heard B.arrived C.glanced D.approached 18A.useless B.hopeless C.helpless D.worthless 19A.same B.equal C.strange D.different 20A.out B.around C.anywhere D.everywhere
已知i是虚数单位且复数z满足z+23+i=10. Ⅰ求z及z2 Ⅱ若z•a+2i是纯虚数求实数a的值.
LastsummerIwenttooneoftheworld'smostfamoushistoricalplacestheForbiddenCityinBeijingwhatwasthehomeoftheemperorsofthelasttwodynastiesintheChinatheMingandQingDynasties.Thepalacehas10.000rooms.InMandarintheForbiddenCityiscallingthePurpleForbiddenCity.Howeverthecolorofthepalacehimselfisnotpurple.ThecolorpurplestandsthepowerofthegreatemperorsofChina.Itwassoasacredplacethatcommonpeoplecouldnotevendreamofevergothere.TheemperorsalsohavesomeofthelargerfestivalcelebrationsattheForbiddenCity.NowtheForbiddenCityisknownasahistoricalsiteformillionsoftouristfromallovertheworld.
对于不等式1+≤+2+<2+3+2<+它们都是正确的. 根据上面不等式的规律归纳猜想与n∈N+的大小并加以证明.
已知函数fx=|x﹣2|. Ⅰ求不等式fx>6﹣|2x+1|的解集 Ⅱ设ab∈2+∞若fa+b=6求的最小值.
点M的直角坐标是则点M的极坐标为
观察下列几个三角恒等式 ①tan10°tan20°+tan20°tan60°+tan60°tan10°=1 ②tan13°tan35°+tan35°tan42°+tan42°tan13°=1 ③tan5°tan100°+tan100°tan﹣15°+tan﹣15°tan5°=1. 一般的若tanαtanβtanγ均有意义你可以归纳出结论
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