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如图甲是半导体材料制成的电阻L和电阻R的I﹣U关系图象．将L和R以两种不同的方式接在同一电源上，如图乙和丙．若乙图中U1：U2＝b，丙图中I1：I2＝a，则下列关系式中正确的是（ ）
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半导体材料的导电能力介于导体和绝缘体之间其电阻受温度影响较大如图甲是某种半导体材料的电阻随温度变化的
温度能地影响金属导体和半导体材料的导电性能在如图所示的图象中分别为某金属和某半导体的电阻随温度变化的
图线1反应半导体材料的电阻随温度的变化
图线2反应金属导体的电阻随温度的变化
图线1反映金属导体的电阻随温度的变化
图线2反映半导体材料的电阻随温度的变化
现有一个电阻元件Z.可能是由金属材料制成的它的电阻随温度的升高而增大也可能是由某种半导体材料制成的其
半导体的导电能力介于导体和绝缘体之间其电阻受温度影响较大如图21甲所示是某种半导体材料的电阻随温度变
电阻温度计是由半导体材料制成的.如图甲是某半导体电阻R.随温度变化的关系图象.根据这种半导体材料电阻
半导体材料的导电能力介于导体和绝缘体之间其电阻受温度影响较大.如图甲是某种半导体材料的电阻随温度变化
如图甲是半导体材料制成的电阻L和电阻R的I﹣U关系图象．将L和R以两种不同的方式接在同一电源上如图
a＝b
a＜
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半导体材料的导电能力介于导体和绝缘体之间其电阻受温度影响较大.如图21甲是某种半导体材料的电阻随温度
温度能明显地影响金属导体和半导体材料的导电性能在右图所示的图象中分别为某金属和某半导体的电阻随温度变
图线1反应半导体材料的电阻随温度的变化
图线2反应金属导体的电阻随温度的变化
图线1反映金属导体的电阻随温度的变化
图线2反映半导体材料的电阻随温度的变化
如图甲所示电路中R.是定值电阻Rt是一个由半导体材料制成的热敏电阻其阻值随温度变化曲线如图乙所示.分
温度升高时，R
t
阻值增大
温度升高时，电流表示数将减小
温度降低时，电压表示数将变大
温度降低时，电路消耗的总功率将增大
半导体和金属的导电能力随温度的变化特点是不同的.因此利用它们制成的元件在生活中也各有各的用途.1一个
温度能地影响金属导体和半导体材料的导电性能在如图所示的图象中分别为某金属和某半导体的电阻随温度变化的
图线1反应半导体材料的电阻随温度的变化
图线2反应金属导体的电阻随温度的变化
图线1反映金属导体的电阻随温度的变化
图线2反映半导体材料的电阻随温度的变化
半导体的导电能力介于导体和绝缘体之间其电阻受温度影响较大如图甲所示是某种半导体材料的电阻随温度变化的
当光照射到光敏电阻上时光敏电阻的阻值填变大不变或变小.半导体热敏电阻是利用半导体材料的电阻率随变化而
如图所示在探究电流与电压的关系实验中1为了能够完成实验在图甲中用笔画线代替导线将实验电路连接完整2闭
如图甲是半导体材料制成的电阻L和电阻R的I﹣U关系图象．将L和R以两种不同的方式接在同一电源上如图
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a＝
a＞
半导体材料的导电性能受外界条件的影响很大有的半导体在温度升高时其电阻减小得非常迅速.利用这种半导体材
为值班室的显示器，a、b之间接报警器。当热敏电阻R
T
所在处出现火情时.显示器A.的电流I.、报警器两端的电压U.的变化情况是 A.I.变大，U.变大
I.变大，U.变小
I.变小，U.变大
I.变小，U.变小
如图甲是半导体材料制成的电阻L和电阻R的I﹣U关系图象．将L和R以两种不同的方式接在同一电源上如图
a＝b
a＜
a＝
a＞
半导体材料的导电能力介于导体和绝缘体之间其电阻受温度影响较大.如图甲是某种半导体材料的电阻随温度变化
如图甲是半导体材料制成的电阻L和电阻R的I﹣U关系图象．将L和R以两种不同的方式接在同一电源上如图
a＝b
a＜
a＝
a＞
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8分2015WasaWarmWildYear.What'sNext?2015sawthingsheatupandgetoutofhandandnotjustinpolitics.ArecordwarmDecemberraisedaveragetemperaturesenoughtomake2015thesecondhottestyearonrecordinthecontiguousUnitedStatesaccordingtotheNationalOceanicandAtmosphericAdministration'sNationalClimateMonitoringAnnualReportwhichwasreleasedThursday.TheUnitedNationshadpreviouslyreportedthat2015wasshapinguptobethewarmestyearonrecordforthewholeplanet.LastyearwasalsothethirdwettestonrecordintheU.S.andsawtenweather﹣orclimate﹣relateddisastersthateachcausedatleast﹩1billionindamageintheU.S.andkilledatotalof155people.Theseincludeadroughttwofloodsfiveseverestormsawildfireandawinterstorm.TheaverageU.S.temperaturewas54.4°F2.4°Fabovethe20thcenturyaverageandsecondonlyto2012'srecordwarmth.Thiswasalsothe19thconsecutiveyearwithaveragetemperaturesabovetheaverageforthecentury.Everystatereportedabove﹣averageannualtemperatures.ThewarmingwasparticularlypronouncedacrossmostoftheeasternhalfofthecountryinDecemberwhenmanyplacessawtemperatures30degreesabovenormalandmanyrecordswereset.ThismirroredchangesseenintheArcticthatmonthwhentemperaturesspikedto50degreesabovenormal.PartofthiswarmingwasdrivenbyastrongElNiñoorperiodicwarminginthePacificOceanbutsomeofitcanalsobeattributedtoglobalwarmingsaysmeteorologistEricHolthauswhowasnotinvolvedwiththefederalreport.TheanalysiscomeslessthanamonthaftertheU.S.and194othercountriessignedanagreementinParistomoreaggressivelycountertheeffectsofclimatechange.'EvenifalltheinitialtargetsinParisaremetwe'llonlybepartofthewaytherewhenitcomestoreducingcarbonfromtheatmosphere'saidPresidentBarackObamaatthetime.Stilltheagreementrepresented'aturningpoint'bysettingup'thearchitecture'fordoingsohesaid.NOAA'sclimatemonitoringcenterdoesn'tissuepredictionsforfutureweatherbuttheagency'sClimatePredictionCenterdoes.Thatteam'sforecastforthenextthreemonthscallsforwarmer﹣than﹣averagetemperaturesinmuchofthecountryalthoughpartsofTexasandtheSoutheastmaybealittlecoolerthanusual.AsLancasterUniversityProfessorGailWhitemantoldtheWeatherChannel'climatechangemeansextremeweatheristhenewnormal.'1AccordingtothepassagethewarmestyearintheU.S.isA.2014B.2015C.notmentionedD.20122Accordingtothepassagewhichstatementisright?A.2015wasthethirdwettestyearonrecordinthewholeplanet.B.Tenweather﹣orclimate﹣relateddisastersintheU.S.includeadroughttwofloodsfourseverestormstwowildfiresandawinterstorm.C.The20thcenturyaveragetemperatureintheU.S.was52°F.D.ThewarmingwaspronouncedacrossmostofthewesternhalfofthecountryinDecember.3TheagreementtheUS.and194countriessignedaimedtoA.reducecarbonfromtheatmosphereB.countereffectsofclimatechange.C.setupthearchitectureD.findartificialwaystocooldowntheextremeweather4WhatdoesProfessorGailWhitemanmeaninthefuture?A.Extremeweatherwillbecommoninthefuture.B.Climatechangewillbenormal.C.Extremeweatherwillbenormalifwedon'ttakemeasures.D.Climatechangeleadtoextremeweather.
Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable.Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished.Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy.Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout.
下列4个图象能正确反映对应变化关系的是
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如图为空气成分比例图按体积计算其中b代表的气体是
10分Therelationshipbetweenexerciseandcancerhaslongbothintriguedandpuzzledoncologistsandexercisephysiologists.Exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.Atthesametimeexerciseinvolvesbiologicalstresswhichtypicallyleadstoashort﹣termincreaseininflammation发炎whichcancontributetohigherrisksformanycancers.Nowanewstudyinmicemayoffersomecluesintotheexercise﹣cancerparadox.Itsuggeststhatexercisemaychangehowtheimmunesystemdealswithcancerbyboostingadrenaline肾上腺素certainimmunecellsandotherchemicalsthattogethercanreducetheseverityofcancerorfightitoffaltogether.TotrytobetterunderstandhowexercisecanbothelevateinflammationandsimultaneouslyprotectthebodyagainstcancerscientistsattheUniversityofCopenhageninDenmarkandotherinstitutionsdecidedtocloselyexaminewhathappensinsidemiceathighriskforthedisease.Soforthenewstudytheybeganbygatheringagroupofadultlabmice.Theseanimalsgenerallyliketorun.Thescientiststhenimplantedmelanoma黑素瘤skincancercellsintothemicebeforeprovidinghalfofthemwithrunningwheelsintheircageswhiletheotheranimalsremainedsedentary.Afterfourweeksfarfeweroftherunnershaddevelopedfull﹣blownmelanomathanthesedentarymiceandthosethathadbeendiagnosedwiththediseaseshowedfewerandsmallerlesions.Theydrewbloodfromboththeexercisingandsedentaryanimalsandcellsfromanytumorsinbothgroups.Asexpectedtheyfoundmuchhigherlevelsofthehormoneadrenalineinthebloodoftheexercisinganimalsespeciallyrightaftertheyhadbeenworkingoutonthewheelsbutalsoatothertimesoftheday.Thebodyreleasesadrenalineinresponsetoalmostanytypeofstressfulexperienceincludingexercise.Theyalsofoundhigherlevelsofinterleukin﹣6inthebloodoftherunners.Thisisasubstancethatisreleasedbyworkingmusclesandisbelievedtobothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.Perhapsmostimportanttheyfoundmuchhighernumbersinthebloodstreamsofrunnersthaninthesedentarymiceofatypeofimmunecellnamednaturalkillercellsthatareknowntobestrongcancerfighters.Sothescientistsrepeatedtheiroriginalexperimentmultipletimesinducingcancerwhileallowingsomemicetorunandotherstosit.Insomeofthesefollow﹣upexperimentsthescientistsinjectedtherunnerswithasubstancethatblockedtheproductionofadrenalineandgavesedentaryanimalslargedosesofaddedadrenaline.Whattheynowfoundwasthatwhenrunningmicecouldnotproduceadrenalinetheydevelopedcanceratthesamerateasthesedentaryanimalswhilethesedentaryanimalsthathadbeeninjectedwithextraadrenalinefoughtofftheirtumorsbetterthanothersittingmice.Moreremarkablythescientistsdeterminedthatadrenalineseemedtobesendingbiochemicalsignalstosomeoftheanimals'IL﹣6cellsmakingthemphysiologicallymorealertsothatwhenatumorbegantodevelopintheaffectedanimalthoseIL﹣6cellsinturnactivatedthenaturalkillercellsinthebloodstreamandactuallydirectedthemtothetumorslikeminuteguidefish.Withtheseresults'weshowthatvoluntarywheelrunninginmicecanreducethegrowthoftumorsandwehaveidentifiedanexercise﹣dependentmobilizationofnaturalkillercellsastheunderlyingcauseofthisprotection'saidPernilleHojmanaresearcherattheUniversityofCopenhagenwhooversawthenewstudy.Itperhapsprovidesonemoreincentiveforustogetupandmove.1TherelationshipbetweenexerciseandcancerhaslongpuzzledoncologistsandexercisephysiologistsbecauseA.exerciseisstronglyassociatedwithloweredrisksformanytypesofcancer.B.exercisecanbothelevateinflammationwhichcancontributetohigherrisksformanycancersandmeanwhileprotectthebodyagainstcancer.C.exercisemaychangecanreducetheseverityofcancerorfightitoffaltogether.D.exercisecanleadtoashort﹣termincreaseininflammationwhichcancontributetoelevatedrisksformanycancers.2Inthefirstexperimentwhichoneisthemostimportantresultthescientistsfound?A.naturalkillercellsaremuchmoreinthebloodstreamsofrunnersthaninthesedentarymice.B.levelsofinterleukin﹣6arehigherinthebloodoftherunnersthaninthesedentarymice.C.exercisesuchasrunningseemedtohelpthemicefightagainstthecancer.D.adrenalinecanreducetheseverityofcancerorfightitoff.3Whatdoestheunderlinedword'sedentary'mean?A.runB.moveC.sitD.sleep4Inthefollow﹣upexperimentsthescientistsfound?A.thehormoneadrenalinehasmuchhigherlevelsinthebloodoftheexercisinganimals.B.howtheseelementsintherunners﹣theirincreasedadrenalineIL﹣6andnaturalkillerimmunecellsfightagainsttumor.C.interleukin﹣6canbothincreaseanddecreaseinflammationinthebodydependingonwhereandhowitgoestowork.D.whathappensinsidemiceathighriskforthedisease.5Accordingtothestudywecaninferthefundamentalsubstancetofightthecanceroffis.A.adrenalineB.interleukin﹣6C.naturalkillercellsD.genes
10分It'snosecretthatdoinggoodmakesothershappy﹣butdidyouknowitcanmakeyouhappyaswell?Accordingtoastudypeopleparticipatinginmeaningfulactivitieswerehappierandfeltthattheirliveshadmorepurposethanpeoplewhoonlyengagedinpleasure﹣seekingbehaviors.Trygivingthesefourthingstootherstostartyourjourneytoahappierandhealthierlifestyle.1.YourTimeWithabusylifeitcanbehardtofindanytimetogiveaway.Howevervolunteeringyourtimehasgreatbenefitsincludingmakingnewfriendsandconnectionslearningnewskillsandevenadvancingyourcareer.Accordingtoapaperaboutthelinkbetweenhealthandvolunteeringvolunteeringisconnectedwithlowerinstancesofdepressionandreducestheriskofdyingby22percent.2.YourAttentionMostofusthinkwe'regoodlistenersbutaccordingtopsychologistPaulDonoghuemostpeopleareawarethatothersdon'tlistenaswellastheycould.Inadditionthey'renotfullyawarethattheythemselvesaren'tlistening.Whenpracticingmindfulnessmeditation正念禅修youfocusonwhatyouexperienceinthemomentandletyourthoughtsandemotionspassthroughwithoutjudgment.Didyouknowthatgivingsomeoneyourundividedattentionhelpsyoualso?Whendonewellactivelisteningstrengthensyourfocus﹣whichisamajorpartofgoodmeditation.3.YourCompassionThepsychologicalmeaningofcompassionistheabilitytounderstandanotherperson'semotionalstate.Compassiondiffersfromempathy移情inthatthosewhoexperiencecompassionnotonlyputthemselvesinanotherperson'sshoesbutalsowanttoreducethatperson'ssuffering.Abrain﹣imagingstudyshowedthatthebrain'spleasurecentersareequallyactivewhenwegivemoneytothepooraswhenwereceivemoneyourselves.4.YourMoneyAccordingtoanexperimentthosewhospendmoneyonotherpeoplearesignificantlyhappierthanthosewhospendthesamequantityofmoneyonthemselves.Whetherornotyoucanofferothergiftsdonatingmoneyhelpsmakerealchangehappen.Itrepresentstimespentcompassionandcarefulattentiontotheneedsofothers.
如图为空气成分比例图按体积计算其中b代表的气体是
It'sapitythatwecan'tarrangeforouragendaotherwisewe______farmorefreedomduringthewholejourney. A.enjoyed B.hadenjoyed C.wouldhaveenjoyed D.wouldenjoy
随着我国航天科技水平的迅速提高已经成功发射过很多火箭． 1“嫦娥三号”探测器于2013年12月2日在西昌卫星发射中心成功发射承担发射任务的长三乙火箭第三子级使用的推进剂是液氢和液氧液氢在液氧中燃烧的化学方程式是． 2“天宫二号”于2016年9月15日在酒泉卫星发射中心成功发射承担发射任务的长征二号FT2运载火箭使用偏二甲肼和四氧化二氮N2O4的推进剂组合其完全反应的化学方程式为 X+2N2O43N2↑+2CO2↑+4H2O则偏二甲肼X的化学式是． 3中国自主研制的首艘货运飞船“天舟一号”于2017年4月20日在海南文昌卫星发射中心成功发射执行发射任务的长征七号运载火箭采用液氧加煤油的低温推进剂组合由于液氧的温度可以达到﹣183℃因此长征七号运载火箭也被誉为“冰箭”．下列说法正确的是填序号． A．液氧是单质 B．液氧是淡蓝色的溶液 C．液氧能促使燃料迅速燃烧 D．煤油是从煤中分离出来的．
2016年10月17日“神舟十一号”载人飞船在酒泉卫星发射中心成功发射下列航天员景海鹏和陈冬在太空享用第一顿美餐中的食物富含糖类的是
周杰伦在菊花台中唱道“梦在远方化成一缕香随风飘散你的模样”…人在远处能闻到一缕香味是因为
﹣﹣﹣CanIreallygetanapple6plusasarewardifIwinthecompetition? ﹣﹣﹣Absolutely!________. A.Sowillyou B.Italldepends C.Imeanit D.That'sallright
AppleVPGregJoswiakannouncedthenewiPhoneSEduringanspecialeventattheAppleheadquartersinCaliforniaonMarch212016sayingtheywill______newsmallerphones. A.issue B.publish C.release D.delay
周杰伦在菊花台中唱道“梦在远方化成一缕香随风飘散你的模样”…人在远处能闻到一缕香味是因为
Mostofemployersareplanningtocutdownonwagesinsteadoflayingoffemployees______theeconomicdepression. A.indefenseof B.withregardto C.onbehalfof D.inresponseto
在当下热播的电视剧人民的名义中达康书记在省委召开的环境综合治理扩大会议上指出工厂废液应变废为宝并处理达标后才能排放．某工厂废液中含有氯化钠氯化铜和氯化亚铁某课外小组要从废液中回收铜并得到铁红主要成分是Fe2O3要求全过程不引入其它金属元素设计实验方案如图所示回答下列问题 1在步骤①中操作a的名称是． 2步骤①②③中所发生的化学反应其中属于复分解反应的是填序号． 3步骤④中如果发生的是一个分解反应且生成物为两种氧化物则另外一种生成物应该是． 4铁红是炼铁的主要原料工业上用CO和铁红炼铁的化学方程式是．
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