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如图所示的电路中,电源电压保持18V不变,两电压表的量程均为0﹣15V,定值电阻R1=6Ω,滑动变阻器R2上标有“50Ω2A”字样.闭合开关S,移动滑动变阻器滑片P到某位置时,电压表V1示数为6V,...
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如图所示电源电压为18V且保持不变电压表的量程为0一15V电流表的量程为0-0.6A滑动变阻器的最大
如图6所示小灯泡电阻为12Ω且保持不变滑动变阻器最大阻值为100Ω电源电压恒为18V要求闭合开关后两
,电压表所选量程为0-15V).滑动变阻器在移动过程中,下列说法正确的是( ) A.电压表跟电流表比值始终不变
通过小灯泡的最大电流可为1.5A.
电压表的示数最小示数为0V
滑动变阻器的取值范围为18Ω~60Ω
如图所示电源电压18V.且保持不变电流表接0~0.6A量程电压表接0~15V量程灯泡上标有6V3W字
如图所示的电路电源电压保持不变闭合开关S.滑片P.由中点逐渐向右移动的过程中
电压表V
2
的示数变小
电流表A.的示数不变
电压表V
1
示数与电流表A.示数的比值变大
电压表V
1
示数与电压表V
2
示数的差值不变
如图所示电源电压18V且保持不变电流表接0—0.6A量程电压表接0—15V量程灯泡上标有6V3W字样
灯泡正常发光时的电流为0.2A
当电流表的示数为0.4A时,电压表的示数为4.8V
为了保证电路的安全,滑动变阻器允许接入的最大阻值为36Ω
为了保证电路的安全,滑动变阻器允许接入的最小阻值为24Ω
如右图所示的电路电源电压保持不变闭合开关S.调节滑动变阻器两电压表的示数随电路中电流的变化的图像如图
如图.电源电压18V保持不变电流表址程0-0.6A电压表量程0一1.5v小灯泡上标有6v3w字样要求
滑动变阻器的滑片向左移动时.电流表和电压表示数变大
当电流表示数为0.4A时。电压表示数为I2V
该电路的最大功率为10.8W
滑动变阻器允许调节的范围是24一60Ω.
把标有6V3W的小灯泡与最大阻值为100Ω的滑动变阻器连接在电源两端电压恒为18V的电路中电路的连接
要求闭合开关后两电表的示数均不超过所选量程,且灯泡两端电压不允许超过额定值(设灯丝电阻不变).下列说法正确的是( )
A.在滑动变阻器滑片向左移动的过程中,电流表示数变大,电压表示数变大
滑动变阻器接入电路的电阻允许调节的范围是18Ω~60Ω
小灯泡的电功率最小值为0.75W
电路总功率的最大值为10.8W
如图所示的电路中电阻R1=4ΩR2为滑动变阻器电源电压为12伏电源电压保持不变所用的电流表量程是0~
如图所示的电路中电源电压U=18V且保持不变定值电阻R1=8Ω电流表的量程为0~0.6A电压表的量程
如图所示的电路中电源两端的电压保持不变闭合开关S.将滑动变阻器的滑片P.向右移下列说法中正确的是
电流表A.的示数变小
电压表V
l
的示数不变
电压表V
2
的示数变大
电压表V
l
与电压表V
2
的示数之和保持不变
把标有6V3W的小灯泡与最大阻值为100Ω的滑动变阻器连接在电源两端电压恒为18V的电路中电路的连接
要求闭合开关后两电表的示数均不超过所选量程,且灯泡两端电压不允许超过额定值(设灯丝电阻不变).下列说法正确的是( )
A.在滑动变阻器滑片向左移动的过程中,电流表示数变大,电压表示数变大
滑动变阻器接入电路的电阻允许调节的范围是18Ω~60Ω
小灯泡的电功率最小值为0.75W
电路总功率的最大值为10.8W
如图所示电路中电源电压保持不变闭合开关S.后下列判断正确的是
电流表、电压表示数均变大
电流表、电压表示数均变小
电压表和电流表示数的比值变小
电流表示数变小,电压表示数变大
如图所示的电路中电源两端的电压保持不变闭合开关S.将滑动变阻器的滑片P.向右移下列说法中正确的是
电流表A.的示数变小
电压表V
l
的示数不变
电压表V
2
的示数变大
电压表V
l
与电压表V
2
的示数之和保持不变
如图7所示的电路中电源电压为18V滑动变阻器R2的阻值范围是0~50Ω电流表的量程是0~0.6A电压
如图所示的电路中电源两端的电压保持不变闭合开关S.将滑动变阻器的滑片P.向右移动下列说法正确的是
电压表V1与电压表V2的示数之和保持不变。
电压表V2与电流表A.的示数之比保持不变。
电流表A.的示数变小,电压表V1的示数变大。
电流表A.的示数变小,电压表V2的示数变大。
如图所示电路滑动变阻器上标有50Ω1A电源电压恒定为18V当开关S.闭合后电流表示数为0.5A电压表
如图电源电压18V保持不变电流表量程是0﹣0.6A电压表量程是0﹣15V小灯泡上标有6V3W字样.要
滑动变阻器的滑片向左移动时,电流表和电压表示数都变大
当电流表示数为0.4A时,电压表示数为12V
该电路的最大功率为9W
滑动变阻器允许调节的范围是18Ω﹣60Ω
如图.电源电压18V保持不变电流表址程0-0.6A电压表量程0一1.5v小灯泡上标有6v3w字样要求
滑动变阻器的滑片向左移动时.电流表和电压表示数变大
当电流表示数为0.4A时。电压表示数为I2V
该电路的最大功率为10.8W
滑动变阻器允许调节的范围是24一60Ω.
如图7所示电源电压为18V且保持不变电压表的量程为0一15V电流表的量程为0-0.6A滑动变阻器的最
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已知函数fx=3x2则fx在x=3处的导数为
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RecentlyIrolledintoalocalrestauranttotryanImpossibleBurgeranall﹣plantmeat﹣likepieinventedbytheSiliconValleycompanyImpossibleFoods.It'sfamousforhavingaweirdlychewyevenbloodymeat﹣likequalityasurprisingverisimilitude逼真thathasmadeitperhapsthecountry'smostfamousburgerasNewYorkmagazinerecentlywrote.OnebiteintoitsgorgeoussmokyflavorandIwasconvinced. Thisisgoodnewsbecausethetimehascometomass﹣producefake假的meatfast.Why?Becauseinthefighttoeaseclimatechangemeatreplacementisoneofthelowest﹣hangingfruits. Meatproductionchewsuplandandletsoutmethane沼气bythekilotonaccountingforabouttwo﹣thirdsofallgreenhousegasemissionsfromagriculture.AUniversityofOxfordstudyrecentlyfoundthattokeepglobalwarmingbelow2degreesthiscenturyweneedtobeeating75percentlessbeefand90percentlessporkglobally.WithoutconcentratedchangewereallyriskgoingbeyondkeyenvironmentallimitsMarcoSpringmannoneoftheOxfordresearcherswarnsme. Dietsareculturallyenshrined神圣的sochangingthemwillbehard.Fakemeatcanhelpcamouflage掩饰thatdramatictransformationwithslightadjustment. Stilleventhemostexceptionalsubstitutesformeatfaceahugechallengeifthey'regoingtoreplace75to90percentofbeefandpork.ThefirsttasteofanImpossibleBurger﹣amomentwhenlowexpectationsworkapowerfulmagicintheproduct'sfavor﹣isonething.Buthowdoyoukeepmeat﹣eatersaskingformoreaftertheirsixthandtheir26th? Fortunatelythesciencehereisplayinganimportantrole.ImpossibleFoodsowesmuchofitsappealtoabioengineeringprocessthatturnsoutbigblood﹣redtanksofhemeacrucialmolecule分子thatgivesveggie素食主义者meatthatslightlymetallicbloodyflavorasDavidLipmanchiefscienceofficerofImpossibleFoodstellsme.Meanwhileculturedmeatcreatedbygrowingactualanimalcellsinabasinisbecomingareality.InNewYorkthescientistsatOceanHuggerFoodshaveengineeredaprocesstotransformtomatoesintomocktuna.AndoverintheNetherlandsacompanycalledTheVegetarianButcherisdevelopingaNespresso﹣styledeviceYoupourinabagofvegetableprotein蛋白质andoutpopsfakemeat.Thecompanyaimstoreleaseitintwoyears. Togettotruemassadoptionfakemeatwillneedtocompetefavorablywiththerealthingonmultiplefronts.ImpossibleFoods'goalistodrivethepriceofitsproductbelowthatofSafeway's80/20hamburgermeatatwhichpointpeoplewillsimplyvotewiththeirwallets.Thenewindustryalsowantstoimproveonanimalfleshinvariousways.Fakemeatwilloutcompetetraditionalmeatbecauseyouwon'tneedtorefrigerateitifyou'remakingitasyougoco﹣founderNikoKoffemansays.That'dgiveunmeatanenormousadvantageforenergy﹣poordevelopingregions.Plusfakemeatcouldprovidemorechoices.YoucouldhaveverysoftandtendermeatforelderlypeopleKoffemanadds.Youcouldhaveacustommeatforwhateveryouneed. Wecouldspeedthisdietaryshiftwithsmartpublicpolicytoo.Beginningin2006NewYorkCitycutthenumberofadultsconsumingoneormoresugarydrinksperdayby35percentbyrunningappealingpublicservicecampaignsandrequiringthelabelingoftheirhighcaloriecounts含量infast﹣foodrestaurants.ImaginesimilarmeasurespromotingfakemeatSavetheplanetbitebybite.Saveyourhealthtoo.Speakingofyourconscienceindustrial﹣scaleanimalfarmingisethically道德上unpleasant. Youcantelltheworldisshiftingthiswaybecausetheranchers牧场主arenervous.LastyeartheUSCattlemen'sAssociationaskedthegovernmenttodefinemeatasaproductobtaineddirectlyfromanimals.Thatanxietywhichisnodoubtcausedbysciencegoestoshowthatthisgrandshiftisn'timpossible. 1TheauthorwasconvincedbytheImpossibleBurgerbecause. A.itlookslikeatraditionalmeatburger B.itcontainsnomeatbuttasteslikemeat C.itsflavorisdifferentfromthatofnormalones D.morevegetablesareusedintheburger 2Whatdoestheauthormeanbysayinglowesthangingfruitsinparagraph2? A.Ataskthatisdifficulttofulfill. B.Anapproachthatiseconomical. C.Aproductthatisenvironment﹣friendly. D.Agoalthatiseasytoachieve. 3Theauthorismostlikelytoagreethat. A.fakemeatisworthyofinvestmentforitsgreatpotential B.fakemeatcannotchangepeople'sdietaryhabits C.adeclineinmeatconsumptioncanrelieveglobalwarming D.fakemeatwillreplacerealmeatbecauseofitslowerprice 4Fakemeathasanadvantageovertraditionalmeatinthat. A.fakemeatwillnotbenecessarilystoredinarefrigerator B.thepriceoffakemeatwillbeone﹣fourthofthetraditionalmeat's C.fakemeatwillwinovertheolderpeoplethankstoitsquality D.fakemeathasabloodyflavorthatisnotfoundintraditionalmeat 5Whatcanbeinferredfromthelastparagraph? A.TheUSgovernmentdoesn'tgiveenoughsupporttoranchers. B.Theworldwillprobablyaccepttheideaoffakemeat. C.Peopledon'tliketoeatmeatproducedbytheranchersnow. D.Thedefinitionofmeathasbeenrevisedbecauseoffakemeat. 6Whichisprobablythesuitabletitleforthepassage? A.Let'sspeedupthedietaryshift B.Let'swelcomethefakemeat C.Fakemeatortraditionalmeatmustwechoose? D.Traditionalmeatanenvironmentkiller
已知a>b>0则下列不等式正确的是
如图FA⊥平面ABC∠ABC=90°EC∥FAFA=3EC=1AB=2AC=4BD⊥AC交AC于点D. Ⅰ证明FD⊥BE Ⅱ求直线BC与平面BEF所成角的正弦值.
Whenaskedwhetherthereisanidealnumberofchildrentohavemanyparentsgivemultiplesometimesconflictinganswers.IntheUnitedStatesnearlyhalfofadultsconsidertwotobetheidealnumberofchildrenaccordingtoGallupsurveyswiththreeasthenextmostpopularoptionpreferredby26percent. Thetwo﹣childidealisamajordeparturefromhalfacenturyagoIn1957only20percentofAmericanssaidtheidealfamilymeanttwoorfewerchildrenwhile71percentsaiditmeantthreeormore.Theeconomyseemstohaveplayedsomeroleinthisshift.StevenMintzahistorianattheUniversityofTexasatAustinsaysthatnumberdroppedasthecostofraisingchildrenroseandasmorewomenenteredtheworkforceandfeltagrowingsenseoffrustration沮丧aboutbeingreducedtochildbearingmachines. __________AsaparentwhoprizeshisownmentalandphysicalhealthsaysRobertCrosnoeasociologyprofessorwhoisalsoattheUniversityofTexasatAustinIhadtostopattwobecausethisnewstyleofintensiveparentingthatpeoplefeeltheyhavetofollowthesedaysreallywearsoneout. Atthesametimehavingonlyonekidmeansparentsmissoutontheopportunitytohaveatleastoneboyandonegirlanarrangementtheyhavetendedtopreferforhalfacentury.Thoughinthelongrunoneresearcherfoundthathavingallgirlsorallboysdoesn'tmeaningfullyaffectthehappinessofmotherswhowantedatleastoneofeach. Perhapsthemostmeaningfuldifferenceisn'tamatterofgoingfromonetotwochildrenortwotothreebutfromzerotoone.Havingjustonechildmakesvariousaspectsofadults'lives﹣howtimemoneyemotionandmindareusedandhownewsocialnetworksareformed﹣child﹣centeredsaysKeiNomaguchiasociologistatBowlingGreenStateUniversity.Ifyouwanttoenjoyadult﹣centeredlifeloveexpensiveleisureactivitiescherishcloserelationshipswithyourpartnerandbothyouandyourpartnerwanttodevoteyourtimetoyourcareerszerokidswouldbethechoice. Mothersofcoursestandtolosemorethanfatherswhentheyhavekidsintheirhousehold.Havingchildrenismorestressfulforwomenthanitisformenandmotherssufferprofessionallyafterhavingchildreninawaythatfathersdon't. Whethertheidealnumberofchildrenisgreaterthanzeroisaquestionmanyresearchershavetriedtoaddress.A2014reviewofexistingresearchwhoseauthorswereskepticalofovergeneralizationsthatmostparentsaremiserableorthatmostparentsarejoyfuldiscoveredotherbroadpatternsBeingaparenttendstobealesspositiveexperienceformothersandpeoplewhoareyoungsingleorhaveyoungchildren.Andittendstobemorepositiveforfathersandpeoplewhoaremarriedorwhobecameparentslaterinlife. 1Whichofthefollowingcanbebestfilledintheblankinparagraph3? A.Thecostsofraisingchildrenarenotjustfinancial. B.Familieswithtwochildrenhavebeenpopularsincethen. C.Besidesthewaysofraisingchildrenhavechanged. D.Manyparentsalsofindraisingchildrenquitetiring. 2AccordingtoKeiNomaguchiafemalecandidatefordepartmentmanagermaydecideto. A.tohavenochild B.haveoneboyandonegirl C.devotemoretimetochildren D.sacrificehercareerforchildren 3Itcanbeinferredfromthepassagethat. A.morewomenfeeldisappointedwiththeirchildren B.coupleswithoneboyandonegirlfeelthehappiest C.fathersdon'thaveanyproblemswiththeircareers D.thehappinessofhavingchildrenvariesindividually 4Thepassagemainlytalksabout. A.theidealnumberofchildrenfamiliesprefertohave B.thereasonsbehindthechangeinpeople'sideaofraisingkids C.whatnumberofchildrenmakesparentshappiest D.differentopinionsresearchershaveofwhethertohavekids
已知向量=x11=410||=则x=•=.
如图F是椭圆C=1a>b>0的右焦点直线ABx-2y+2=0与椭圆C相切于点A Ⅰ若a=求b Ⅱ若||=||=0求椭圆C的方程.
Therumoraboutmesoquicklythateverypersoninmycompanyknowsitinashorttime. A.develops B.transforms C.accelerates D.circulates
Whileabruteforceapproachtolearningmaygetthejobdoneit'snotnecessarilythebeststudyplan.Wedugthroughscientificresearchtoidentifyfivestudymethodsthatarerecommendedbycognitivescientists.Thesestudytipsmayimprovetheefficiencyofhowyoustudyhelpingyoutolearnmoreinlesstimeandkeepitlonger. Don'tWaitUntiltheLastMinute Parentsandteachersoftenwarnthatcrammingforexamsisn'tthebestwaytogetgoodgrades.There'ssciencetobackthisup.Researchersfoundthatfinaltestresultsimprovedwhenstudyingwasspacedoutovertime.Thisspacingeffecthasbeenrepeatedlystudiedandoneresearchexperimentfounda36%improvementingradesbecauseofspacingoutstudysessions.Byspacingoutstudysessionsthere'saneural神经的processoflearningforgettingalittlebitandre﹣learning.Thesecyclesarewhatbuildstrongermemory. UsePracticeTests Usingpracticetestswhilepreparingforexamscanhelpyouimproveyourperformance.Thislearningstrategyisn'tjustaboutbecomingfamiliarwithatestingformatit'saboutreinforcingthebrain'smemory. Rememberthatre﹣readingmaterialcanrefreshyourawarenessbutitwon'thelpyoubuildthememoryrecallskillsthatcanhelpyouknowthecorrectanswerduringyourexam.Abetterwaytostudyistouseflashcardsorsamplequizzesfromyourtextbook. DoOneThingataTime Researchshowsthatmultitaskingisn'tgoodforyourmemorysowhenyou'restudyingthat'stheonlythingyoushouldbedoing.ConsideryourbrainpowersimilartoyourInternetbandwidth.Multipledownloadsatthetimewillslowthingsdown.Similarlymultitaskingcausesanincreasedcognitiveloadforyourbrainreducingyourabilitytopayattentiontowhatyou'relearning. Infactresearchersfoundthatevenminimalmultitaskinghasaneffect.Somethingassimpleaswalkingaroundatrackwhilelearningvocabularywordscauseda17%reductionintestscores. AddVariety Whileit'sagoodideatoonlystudyforonesubjectatatimescientistsfoundthatalternatingbetweensubtopicscoulddramaticallyimprovememory. Thisprocessknownasinterleavingmeansthatyou'llcyclethroughaboutthreesubtopicslearningalittlebitmoreabouteachduringeachcycle.Onceyou'vefullystudiedthissetandhaveanunderstandingofthematerialyoucanmoveontothenextsetandrepeatthepattern. TeachaFriend It'slongbeensaidthatthebestwaytolearnsomethingistoteachittosomeoneelse.KnownastheprotégéeffectthislearningtheorydatesbacktoancientRome. Thereasonthestudytechniquehaslastedsolongisthatit'seffective.Researchersfoundthatevenexplainingclassmaterialtoyourselfcouldresultinthreetimesbettertestscoresthanthoseofotherstudentsputtingyouwellahead. Fivelearningstrategiestobe1inyourstudy Passageoutline Supportingdetails Don'twaituntilthelastminute ●Thereisscientificevidenceto2thefactthatcrammingforexamsdoesnotnecessarilybringaboutgoodgrades. ●Insteadofspacingoutstudysessionsstudentstendtopreparefortheirtestsina3. Usepracticetests ●Practicetestsarenotmerelyintendedtomakestudents4withtestingformatsbutreinforcedthebrain'smemory. ●Re﹣readingmaterialcanmakeyou5ofwhatyouhavelearntwhileflashcardsorsamplequizzescanbuildmemoryrecallskills. 6multitasking Multipletaskscanreducetheabilitytofocusonwhatisbeinglearned. Involvesubtopicsinyourstudy ●Studyingforonesubjectatatimeisrecommendedbutalternatingbetweensubtopicsleadstodramatic7inmemory. ●Interleavingisalearningprocesswherestudentslearnaboutthreesubtopicsineach8. Teachafriend ●Protégéeffectisalearningtheoryinwhichstudentscan9fromteachingsomeoneelse. ●Explainingclassmaterialtooneselfmay10.
已知椭圆C1m2x2+y2=10<m<1与双曲线C2n2x2-y2=1n>0有共同的焦点e1e2分别为C1C2的离心率则e1•e2的取值范围是
请阅读下面文字及图片并按照要求用英语写一篇150词左右的文章. SoCloseYetSoFar WhereamI?WhatamIdoing?Ifyou'reoneofmy500friendsonlineyou'llalwaysbethefirsttoknow.MyphoneandlaptopareneveroutoftouchingdistancesoI'mconstantlypostingupdatesonsocialmedia﹣whetherI'mhavingacoffeeonmywaytoschoolwatchingTV…evenwhenI'mintheshower.Ihaveanever﹣endingflowofmessagesandupdatesfromallthepeopleIassociatewithonline. Iliveinauniversitydormwithacoupleofgreatroommates.YetthetruthofthematterisIfeellonely.AfewdaysagoIwentoutforadinnerget﹣togetherwithsomefriends.Mybestfriendleftthetablefor30minutesbecausehehadtotakeacall.Somespentthedinnerbentovertheirphonestextingfriendsonlinebutignoringtheonewhosatrightinfrontofthem.Andtheextraordinarythingisnoonethoughtthiswasrudeit'sjusthowlifeisnowadays. 【写作内容】 1.用约30个单词概述上述文字所描述的现象 2.分析造成该现象的原因两至三点 3.请你给Mark提两到三条建议. 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
InAHistoryofReadingtheCanadiannovelistAlbertoMangueldescribesaremarkabletransformationofhumanconsciousnesswhichtookplacearoundthe10thcenturyA.D.thearrivalofsilentreading.Humanbeingshavebeenreadingforthousandsofyearsbutinancienttimesthenormalthingwastoreadaloud.WiththearrivalofsilentreadingManguelwrites…thereaderwasatlastabletoestablishanunrestrictedrelationshipwiththebookandthewords.Thewordsnolongerneededtooccupythetimerequiredtopronouncethem.Thereader'sthoughtsinspectedthematleisuredrawingnewideasfromthemallowingcomparisonsfrommemoryorfromotherbooks. ①Toreadsilentlyistofreeyourmindtoreflecttoremembertoquestionandcompare.ThecognitivescientistMaryanneWolfcallsthisfreedomthesecretgiftoftimetothink.Athousandyearslatercriticsfearthatdigitaltechnologyhasputthisgiftindanger.TheInternet'sfloodofinformationtogetherwiththedistractionsofsocialmediathreatenstooverwhelmthespaceofreadingleavingusinwhatthejournalistNicholasCarrhascalledtheshallows.InCarr'sviewtheendlesstemptingbuzzoftheInternetendangersourverybeingOneofthegreatestdangerswefacehewritesaswegiveupcontrolovertheflowofourthoughtsandmemoriestoapowerfulelectronicsystemisaslowdamagetoourhumannessandourhumanity. ②There'snoquestionthatdigitaltechnologypresentschallengestothereadingbrain.Butseenfromahistoricalperspectivedigitalreadingandsilentreadinglooklikedifferencesofdegreeratherthanofkind.Totheextentthatdigitalreadingrepresentssomethingnewitspotentialcutsbothways.DonebadlytheInternetreducesustomindlessclickersracingnumblytothebottomofabottomlessfeedbutdonewellithasthepotentialtoexpandtheverycontemplative沉思的spacethatwehaveprizedinourselveseversincewelearnedtoreadwithoutmovingourlips. ③InthefifthcenturyB.C.Socratesworriedthatwritingwouldweakenhumanmemoryandstifle扼杀judgment.InfactasWolfnotesinher2007bookProustandtheSquidtheStoryandScienceoftheReadingBraintheoppositehappenedFacedwiththewrittenpagethereader'sbraindevelopsnewcapacities. ④TheInternetmaycauseourmindstowanderoffandyetaquicklookatthehistoryofbookssuggeststhatwehavebeenwanderingoffallalong.Whenwereadtheeyedoesnotprogresssteadilyalongthelineoftextitalternatesbetweensaccades﹣littlejumps﹣andbriefstopsnotunlikethemovementofthemouse'scursoracrossascreenofhypertext. ⑤It'struethatstudieshavefoundthatreadersgiventextonascreendoworseonrecallandcomprehensionteststhanreadersgiventhesametextonpaper.Buta2015studybytheGermaneducatorJohannesNaumannsuggeststheopposite.Hegaveagroupofhigh﹣schoolstudentsthejoboftrackingdowncertainpiecesofinformationonwebsiteshefoundthatthestudentswhoregularlydidresearchonlinewerebetteratthistaskthanstudentswhousedtheInternetmostlytosendemailchatandblog. ⑥Anewgenerationofdigitalwriterspreferstoincludeinteractivefeatures.The2014iPadnovelPrytellsthestoryofademolition爆破expertreturninghomefromthefirstGulfWar.Thestoryistoldintextphotographsvideoclipsandaudio.Itusesaninterface界面thatallowsyoutofollowtheactionandshiftbetweenlevelsofawareness.Asyoureadtextonthescreendescribingcharactersandplotyoudrawyourfingersapartandseeaphotographofthechiefcharacterhiseyesopeningontheworld.Pinchyourfingersshutandyouvisithistroubledunconsciouswordsandimagesracebyasifyouareinsidehismemory.Pryistheoppositeofashallowworkitswholeplayisbetweenthesurfaceandthedepthsofthehumanmind.Readingitisstimulating. 1InAlbertoManguel'sopinionsilentreading. A.isanabnormalthingtohumanconsciousness B.offersreaders'mindfreedomandtimetothink C.strengthensreaders'powerofmemoryandreflection D.allowsreaderstogainaninsightintobooksandwords 2Whyisdigitaltechnologyconsideredtohaveendangeredourbeing? A.Itpresentschallengestothereadingbrain. B.Itharmsourhumannessandhumanitygradually. C.Itisverylikelytoexpandourcontemplativespace. D.Itleavesourthoughtsandmemoriesoutofcontrol. 3ThesentenceThefearoftechnologyisnotnew.shouldbeplacedin. A.① B.② C.③ D.④ 4WhatcanweinferfromJohannesNaumann'sstudy? A.It'seasiertocollectinformationontheInternetthaninbooks. B.People'shabitofusingtheInternetinfluencestheirperformance. C.TheInternetisn'tsupposedtobeusedasatoolofentertainment. D.Paperreadingisbetterthanscreenreadinginimprovingcomprehension. 5The2014iPadnovelPryismentionedinthelastparagraphto. A.introducetheoccurrenceofareadingrevolution B.showthetechnologyemployedindigitalreading C.provedigitalreadingnotshallowbutattractive D.illustratetheimpactdigitalreadinghasonourlife 6Whatisprobablythebesttitleforthepassage? A.Thedeepspaceofdigitalreading B.Thetimelyarrivalofsilentreading C.Thedevelopmentoftraditionalreading D.Thepotentialdamageofelectronicbooks
HowtoStrengthenWillpower Manypeoplebelievewithmorewillpowertheywouldalleatrightexerciseregularlyavoiddrugsandalcoholstopprocrastinating拖延andachieveallsortsofnoblegoals.Willpowerisnotanewconceptbutwestilldonothavewidespreadawarenessofit. Asitturnsoutyourwillpowerislikeamuscle.Andsimilartohowyourmusclesgettiredattheendofaworkoutthestrengthofyourwillpowerfadesasyoumakemoredecisions.Thismakessense.InaresearchstudypublishedbytheNationalAcademyofSciencespsychologistsexaminedthefactorsthatimpactwhetherornotajudgeapprovesacriminalforparole假释.Atthebeginningofthedayajudgewillgiveeachcaseafairshot.Butastheirenergystartstofade?Denydenydeny. Alargebodyofresearchhasbeendevelopedinrecentyearstoexplainmanyaspectsofwillpower.Mostoftheresearchersexploringself﹣controldosowithanobviousgoalinmindHowcanwillpowerbestrengthened? Avoidingtemptationisoneeffectivestrategyformaintainingself﹣control.InWalterMischel'smarshmallow软糖studythechildrenwhostareddirectlyatthetreatwerelesslikelytoresistitthanwerekidswhoclosedtheireyesturnedawayorotherwisedistractedthemselves.Thisprincipleappliestoadultstoo.Onerecentstudyforinstancefoundofficeworkerswhokeptcandyinadeskdraweratelessthanwhentheykeptthecandyinplainsight. Anotherhelpfultechniqueforimprovingself﹣controlisanimplementation履行intention.ForexamplesomeonewhoiswatchingtheiralcoholintakemightsaybeforeapartyIfanyoneoffersmeadrinkthenI'llaskforclubsoda.Researchamongadolescentsandadultshasfoundthatimplementationintentionsimproveself﹣controlevenamongpeoplewhosewillpowerhasbeenreducedbylaboratorytasks. Justlikeamusclethatgetstiredwithheavyusethereisanotheraspecttothemusclecomparison.Whilemusclesbecomeexhaustedbyexerciseintheshorttermtheyarestrengthenedbyregularexerciseinthelongterm.Similarlyregularlyexercisingself﹣controlmayimprovewillpowerstrength. Theevidencefromwillpower﹣depletionstudiesalsosuggeststhatmakingalistofresolutions心愿onNewYear'sEveistheworstpossibleapproach.Beingusedinoneareacanreducewillpowerinotherareassodon'ttrytoquitsmokingadoptahealthydietandstartanewexerciseplanatthesametime.Takinggoalsonebyoneisabetterapproach.Onceagoodhabitisinplaceyou'llnolongerneedtodrawonyourwillpowertomaintainthebehavior.Eventuallyhealthyhabitswillbecomeroutineandwon'trequiremakingdecisionsatall. Sonexttimeinthefaceoftemptationyoudon'thavetoworryaboutthedrainonyourwillpower.Withproperapproachesyoucantrainyourwillpowertostaystrong. A1resource ★Justlikemusclewillpowerdecreasesasyouuseitmore. Intheparoleinstancethejudgemademore2judgementsastimepassed. Waystostrengthenwillpower ★Willpowercanbemaintainedby3awayfromtemptations. Researchfoundthatofficeworkersatelesscandywhenitwasoutof4. ★Havinga5aheadoftimewillnotexhaustyourwillpowerwhenmakingdecisions. Forexampleonemaydecidebeforeapartythatifofferedadrinkaskforsoda6. ★Willpowercanbestrengthenedthroughregular7. ★Don'ttrytoaccomplishtoomanygoalsata8. AsevidenceshowsNewYearresolutionsdon'tworkbecauseyourwillpoweris9up. Good10aboutwillpower Peoplecanstrengthentheirwillpowerwiththerightapproaches.
已知双曲线=1a>0b>0的一条渐近线方程为y=-2x则此双曲线的离心率为
MykidssitinGee'slivingroomandcautiouslyliftantiqueChristmasornaments饰品outofawell﹣lovedcardboardbox.Geestandsbesidethemquietly1eachtreasure.ShetellsmethatsheandTombuilttheirornament2piecebypieceduringeachyear'safter﹣Christmassale.She3asweleavewiththebox.Herprecioustreasuresgatheredoveralifetimehavefoundanew4. WefirstmetTomandGeeintheearlydaysofourmarriage.Someonehadbeen5ourgarbagecanstothegarageeachgarbagedayandJimandIhad6who.Thenonedaywe7himanelderlymanwholivedacrossthestreet. Ibakedcookiesandleftthemonastooloutsidethegaragewithathank﹣younote.Whenwegothomefromworkthatdayatypedletterhad8thegift.TheletterwasfromTomandexplainedhowhehadcometowalktheneighborhoodongarbagedayreturningcansforpeoplehe9knew.Backwhenhe'dbeenfightingawarIwasn't10toseehisyoungwifeGeehadfoundherselflivingalone.Neighborshadtakenthetimetohandlehergarbagecans11shedidn'thavetoandheneverforgot.Nowhe12itforwardbydoingthesameforallofus. Afewyearsafterwe'dmovedinTom13.Wephotocopiedthat14andattachedittooneofourownforGee.Wetoldherhow15Tomhadbeentousandhowwegrievedforher.Shewrotebackandtoldusshe16talkedtoTomeveryday.WhenGeeinvitedusovertolookthroughChristmasornamentsIrealizedhowharditmustbeto17withthatboxapieceofTom. JimandIagreeto18ourtreewithGee'sornamentsthisChristmasoutoftheboxthatis19inTom'shandwriting.MaybeI'lltalktohimjustasGeestilldoes.ThankyouI'llsayforteachinguswhatit20tobeaneighbor. 1A.confirming B.explaining C.revealing D.touching 2A.shelf B.basement C.art D.collection 3A.smiles B.weeps C.sighs D.hesitates 4A.home B.destination C.function D.chance 5A.distributing B.exposing C.returning D.attaching 6A.discovered B.wondered C.foreseen D.investigated 7A.spotted B.impressed C.acknowledged D.grasped 8A.answered B.replaced C.delivered D.rewarded 9A.especially B.thoroughly C.previously D.barely 10A.willing B.voluntary C.alive D.keen 11A.so B.before C.because D.if 12A.brought B.carried C.paid D.pushed 13A.survived B.withdrew C.retired D.died 14A.note B.gift C.letter D.treasure 15A.grateful B.close C.special D.superior 16A.still B.even C.just D.ever 17A.live B.finish C.go D.part 18A.supply B.manage C.decorate D.arm 19A.drafted B.labeled C.signed D.preserved 20A.reflects B.desires C.anticipates D.means
用数学归纳法证明“1-+-+…+=n∈N*”第一步应验证的等式是从“n=k”到“n=k+l”左边需增加的代数式是
已知F为抛物线y2=4x的焦点过点F且斜率为1的直线交抛物线于AB两点设|FA|>|FB|则=.
若函数fx=mx3+2x2-3x-1存在单调递增区间则实数m的值可以为
Someoftheworld'smostfamousmusiciansrecentlygatheredinParisandNewOrleanstocelebratethefirstannualInternationalJazzDay.UNESCOUnitedNationsEducationalScientificandCulturalOrganizationrecently1April30asadaytoraiseawarenessofjazzmusicitssignificanceanditspotentialasaunifying联合voice2cultures. Despitethecelebrations3intheU.S.thejazzaudiencecontinuesto4andgrowolderandthemusichasfailedtoconnectwith5generations. It'sJasonMoran'sjobtohelpchangethat.AstheKennedyCenter'sartistic6forjazzMoranhopesto7theaudienceforjazzmakethemusicmore8andpreserveitshistoryandculture. Jazzseemslikeit'snotreallyapartoftheAmerican9MorantellsNationalPublicRadio.WhatI'mhopingtoaccomplishisthatmygenerationandyoungerstartto10andunderstandthatjazzisnotblackandwhiteanymore.It'sactually11andit'sactuallydigital. Moransaysoneofthe12withjazztodayisthattheentertainmentaspectofthemusichasbeenlost.Themusiccan'tbe13todaythewayitwasin1908or1958.Ithastocontinuetomovebecausethewaytheworldworksis14saysMoran. LastyearMoranworkedonaprojectthat15FatsWaller'smusicforadancepartyjusttokindofputitbackinthemindthatWallerisdancemusic16itisconcertmusicsaysMoran.Formeit'stherecontextualization情景重构.Inmusicwheredoesthe17lie?Areweashumansgainingany18intohowwetalkaboutourselvesand19somethingasabstractasaCharlieParkerrecordgetsusintoadialogueaboutouremotionsandourthoughts?SometimeswelosesightthatthemusichasawidercontextsaysMoransoIwanttocontinuethose20. 1A.saluted B.set C.marked D.laid 2A.through B.around C.across D.outside 3A.regardless B.thus C.though D.rather 4A.expand B.boycott C.extend D.shrink 5A.younger B.smaller C.elder D.larger 6A.inventor B.adviser C.visitor D.officer 7A.widen B.strengthen C.enforce D.enrich 8A.available B.admirable C.avoidable D.accessible 9A.category B.appeal C.appetite D.recipe 10A.reconstruct B.reshape C.restore D.reconsider 11A.colorful B.meaningful C.creative D.sensitive 12A.connections B.problems C.satisfactions D.conflicts 13A.described B.revealed C.presented D.exposed 14A.transferring B.changing C.recovering D.processing 15A.managed B.arranged C.conveyed D.conducted 16A.asmuchas B.aslongas C.asfaras D.assoonas 17A.reality B.emotion C.melody D.future 18A.comprehension B.access C.appreciation D.insight 19A.why B.which C.how D.what 20A.trends B.dialogues C.messages D.contexts
We'reallusedtothelatestgenerationsofmobiletelecoms﹣sois5Gjustanotherupgrade?Farfromit﹣5Gisahugeleapforward﹣liketheshiftfromthehorseandcarttocars.Anditisn'tjustanetwork5Gwillbecomethefoundationoftheentireglobaldigitaleconomycapableofgeneratingtrillionsofpoundsofvalue. Everyoneandeveryindustrywillfeelitseffects.Comparedtotoday5Gwillbe10to20timesfasterandsupportbillionsofdigitaldeviceswithmuchgreaterreliabilityandsecurity.5GprovidestheplatformfortheInternetofThings﹣everythingfromself﹣drivingcarstoenhancedmedicalandsocialcaretoallmannerofnewindustrialandbusinessapplications.Wellestablishedonlineserviceslikemediaandentertainmentwillseesignificantimprovementssuchasultra﹣highdefinitionvideoandverylowlatency延时onlinegaming. 5Gcouplesafullfibrefixednetworkapproachwithhighcapacityhighreliabilityandlowlatencymobileplusadvancedsoftwareapproachessuchasedgecomputingandnetworkvirtualisation.Newtechniquessuchasnetworkslicingallowdifferenttypesofservicestorunatthesametimevastlyincreasingthescopeofapplicationsandservicesthatcanbesupported.Ineffectone5Gnetworkcanactasthousandsorevenbillionsofvirtualnetworkseachspecialisedforaparticulartaskordedicatedtoasinglecustomerbutallrunningononephysicalinfrastructure. Whileconsumersmaybethemostobviousbeneficiariesoffastermoreintelligentandusefulservices5Gwillalsobringenormousbenefitsandopportunitiestobusinessesbyallowingenhancementsanddifferentiatorstoexistingproductsandservicesorbyprovidingaplatformforentirelynewdigitalservices.5Gisanindustrialgame﹣changerandonethatyoucan'tignore.Withtrialsenablingtechnologyalreadyunderwayaroundtheworld5Gwillbecomeanincreasingrealitywithinthenextcoupleofyears. 5GisofsuchcriticalimportancetotheUKeconomythattheGovernmentisstronglybackingeffortstohelptheUKbecomeamarketleaderinexploitingthetechnology.IthasrecentlypublishedastrategytocreateanexcitingUK5Gworldandarrangetheactionsneededtospeeditsintroduction.Itisactivelycoordinatingeffortstoacceleratemaking5Garealityandisfundingtrialsofthetechnologyground﹣breakingapplicationsandinnovativebusinesspartnershipsacrossawiderangeofurbanandruralapplications. 1Whatcanwelearnabout5Gfromthisarticle? A.5Gwillbearegularupgradeofthelatestgenerationsofmobiletelecoms. B.5Gwillbemorereliableandsecurethantheearliergenerationsofmobiletelecoms. C.5Gwillalloweverysinglecustomertohaveonephysicalinfrastructuretorun. D.5Gwillbeontrialaroundtheworldwithinthenextcoupleofyears. 2Whatdoestheunderlinedwordbeneficiariesinparagraph4probablymean? A.Peoplewhomakecontributions. B.Peoplewhomakegains. C.Peoplewhohavecreativity. D.Peoplewhosufferlosses. 3WhatattitudedoestheUKholdtowards5G? A.Hesitant. B.Cautious. C.Concerned. D.Ambitious.
Ataskoftoppriorityforthelocalgovernmentistoappropriatemeasurestominimizetheexposureoflocalresidentstothedensesmog. A.meetupwith B.comeupwith C.getawaywith D.doawaywith
已知抛物线y2=4x过焦点F作斜率为k1的直线交抛物线于AB两点.1若|AB|=5求k1.2过焦点F再作斜率为k2的直线交抛物线于CD两点且MN分别是线段ABCD的中点若k1+k2=1证明直线MN过定点.
Theworld'sfirstelectricdriverlessheavytruckissaidtobethantraditionalones. A.tentimesmoresafer B.morethantentimessafer C.morethantentimesassafe D.tenmoretimesassafe
复数z=1-ii为虚数单位的虚部为
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