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2016年12月华为瓦特实验室试验一种新型快充电池,充电时电池的电量y(%)是充电时间x(分)的一次函数,其中y≤100(%).已知充电前电量为0(%),测得充电10分钟后电量达到100(%),充满...
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蓄电池是一种储能元件它能够把电能转换为化学能储存在蓄电池内此过程称为在需要时它又可以把化学能转化为电
充电、充电
放电、放电
充电、放电
放电、充电
MP3随身听以其独特的魅力成为年轻人的时尚若MP3正常工作时的功率为0.01W则连续播放100s消耗
监控单元对电源柜进行监控管理显示对蓄电池进行充电管理电源柜 部分的充电方式分为和三种模式
快充电
均充电
浮充电
过充电
下列哪些是给蓄电池充电时应该注意的
充电电压不得超过30V
充电电流快充不得超过30A,慢充不得超过15A
快速充电充电时间不得超过6小时,慢充不得超过12小时
当充电机地电流指针指向0A时表明已经充满
均衡充电是对蓄电池组以高于浮充电压充电并且按限流恒压两个阶段来进行控制的一种充电方法进行均衡充电需要
请你阅读下面的短文回答问题市场上有一种磁吸式手机充电线如图能通过磁铁公母对吸方式达到接通充电效果的充
2016年12月华为瓦特实验室试验一种新型快充电池充电时电池的电量y%是充电时间x分的一次函数其中
华为手机的超级快充充电器最大充电电流可达5A.现有华为某一型号的电池容量为4200mAh其中mA为电
电动自行车常用的铅蓄电池是一种可充电的化学电源当给它充电时是能转化成了能太空飞船所用的氢燃料电池是一
实验室用一节蓄电池的电压为蓄电池是化学电池放电后可以再充电它在放电过程中将能转化为能.
电池的日常维护保养应注意以下几点
不得用非标准充电器充电
定期对电池触点进行清洁
新电池首次充电应充足12-16小时
充电完毕应将电池从充电器上取下
电池最低每半年充电一次
我国家庭电路的电压为________人体能承受的安全电压不高于_______实验室三节蓄电池串联的电
2016年12月1日华为正式宣称已掌握石墨烯技术运用于手机快充电池石墨烯是由石墨剥离而成的单原子层石
石墨烯和石墨是由不同种原子构成
石墨烯强度大,能燃烧
石墨烯能还原氧化铜
石墨烯与金刚石的碳原子的排列方式不同
均衡充电是对蓄电池组以高于浮充电压充电并且按两个阶段进行控制的一种充电方法
2016年·安康三模据国外某媒体报道科学家发明了一种新型超级电容器能让手机几分钟内充满电若某同学登山
充电时,电容器的电容变小
充电时,电容器存储的电能变小
充电时,电容器所带的电荷量可能不变
充电结束后,电容器不带电,电容器的电容为零
新造蓄电池在工厂内施行的一种充电叫
初充电
补充电
普通充电
化成充电
6-Q-195新蓄电池初充电时在第一阶段一般充电电流应为13A充电时间为h
12-24
16-24
12
12-16
关于蓄电池直流电源的说法正确的有
对蓄电池的充电只有浮充一种
对蓄电池充电有浮充和均充两种
正常运行时,浮充电装置与电池组并联工作,供给接在直流母线上的经常性负荷,同时以不大的电流向蓄电池浮充电
在断路器合闸时,蓄电池组提供瞬间大电流
电动自行车常用的铅蓄电池是一种可充电的化学电源当给它充电时是能转化成了能太空飞船所用的氢燃料电池是一
电动自行车常用的铅蓄电池是一种可充电的化学电源当给它充电时是能转化成了能太空飞船所用的氢燃料电池是一
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10分增加在缺词处加一个漏词符号并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1每处错误及其修改均仅限一词 2只允许修改10处多者从第11处起不计分 IaswellasmyparentsaregoingtoNewYorkCitythismonth.Ihadbeenlookingforwardtogoingthereforlongtime.Itisoneofthebeautifulcityallovertheworld.Thereare.manyplacesofinterestswhereyoucanlearnsomethingyoucanlearnitinschool.I'dalsoliketoseetheEmpireStateBuilding.UnfortunatelytheTwinTowersweredestroyedinSeptember112001andIwouldhavethechancetoseethembyhimself.NowIamgettingreadyfortheexcitedtrip.Iamsureitwillbeanunforgettableexperience.
10分Therewasoncealonelygirlwhowantedloveverymuch.Onedaywhileshewaswalkinginthewoodsshefoundtwobirds.1Shetookcareofthemwithloveandthebirdsgrewstrong.Everymorningtheygreetedherwithabeautifulsong.Thegirlfeltgreatloveforthebirds.Shewantedtheirsingingtolastforever.2Thelargerandstrongerofthetwobirdsflewoutofthecage.Thegirlwatchedworriedlyasheflewaboveher.Shewassofrightenedthathewouldflyawayandshewouldneverseehim.Soasheflewcloseshecaughthimquickly.Shefeltveryhappy.3Herlovehadkilledhim.Shenoticedtheotherbirdstandingatthedoorofthecage.Shecouldfeelhisgreatneedforfreedomandhisneedtoflyintotheclearbluesky.4Thebirdflewaroundheroncetwicethreetimes.Thegirllookedhappilyatthebird'senjoyment.Herheartwasnolongerconcernedwithherloss损失.5Suddenlythebirdflewcloserandlandedsoftlyonherhand.Itsangthesweetestsongshehadeverheard. Thefastestwaytoloseloveistoholdontootightthebestwaytokeeploveistogiveitwings! A.Onedaythegirlleftthedoortothecageopen. B.Sheliftedhimfromthecageandfreedhim. C.Shetookthemhomeandputtheminasmallcage. D.Thebirdsweresobeautifulthatshelovedthemverymuch. AB.Shewantedthebirdtobehappy. AC.Sherealizedhermistake. AD.Howeverwhensheopenedherhandshefoundthebirdhaddied.
8分WhileassistedlivingcentershavebeenavailableintheUnitedStatesformanyyearsthegrowthandavailabilityofassistedlivinghashadadramaticincreasesincetheearly1990s.Anassistedlivingcenterisaresidentialalternativethatpromotesmaximumindependenceforeachresidentthroughacombinationofsupportiveservicesandassistance.Thedefinitionofassistedlivingfromonestatetoanothermayvaryandsowillthecostandtypesofservices. Assistedlivingcentersvaryinsizestyleandtheoptionalservicestheymayoffer.SmallfamilystylelivingorthelargercomplexofunitscanbefoundintheUnitedStates.Somefacilitiesareoperatedbynonprofitorganizationswhileothersareproprietary.Inadditionsomefacilitiesmaybeco﹣locatedoraffiliated附属withahospitalornursingfacility. Anassistedlivingcenterisanyinstitutionresthomeboardinghomeplacebuildingoragencythatismaintainedandoperatedtoprovidepersonalcareandserviceswhichmeetsomeneedbeyondbasicprovisionoffoodshelterandlaundryinafreestandingphysicallyseparatefacilitywhichisnototherwiserequiredtobelicensed. Ingeneraltermsanassistedlivingcenterisrequiredtoprovideassistancewithdailylivingactivitiesincludingeatingbathingdressingandpersonalhygienethreemealsadaysupervision监督管理ofself﹣administrationofmedicationslaundryserviceincludingpersonallaundryhousekeepingand24﹣hourstaffing. 1Whatisanassistedlivingcenter? A.Ahotelthatservesmeals. B.Aplaceforchildrentobetakencareof. C.Anentertainmentplaceforadults. D.Aplacewhichgivessupportiveservicesandassistance. 2WhichofthefollowingisTRUE? A.Allassistedlivingcentersofferthesamekindsofservices. B.Allassistedlivingcenterscostthesame. C.TherearedifferentkindsofassistedlivingcentersintheUnitedStates. D.Allassistedlivingcentersareofthesamesize. 3Theunderlinedwordproprietaryinthesecondparagraphprobablymeans A.state﹣owned B.governmental C.ownedbyacharityorganization D.private 4What'sthebesttitleforthepassage? A.What'sanassistedlivingcenter? B.AssistedlivingcentersarepopularintheUnitedStates. C.Assistedlivingcentersoffergoodservices. D.Welcometotheassistedlivingcenter.
1分WhenthewomansawthathersonwasOKafterthecaraccidentshesaidWelldearyouarethemostimportantformenottheexpensivecar. A.inpeace B.indanger C.insurprise D.inrelief
30分Todaymobilephonesandcomputersareverypopular.Manypeopleusethemto1witheachother.Byusingamobilephoneoracomputeryoucansendmessages2.quicklyandasoftenasyoulike.Nolongerisit3tofindapenorpaper4anenvelopeorastamp. Arewe5anythingbynotwritingactualletterstopeople?Istheexperienceof6suchlettersworththetroubleofwritingthem?MostpeoplewouldprobablyreplyNoitwasawasteof7anyway.Thisisamuchbettersystem.It'shardtoargueagainstsuchalogicalviewpoint.8Iwouldliketotry. I9thatthekindsofletterspeopleusedtowritetendedtobemore10thanthevastmajorityofthebillionsofemailsandtextmessagessenttoday.Ofcoursewhenitcomestosendingquickmessagesto11specificinformationemailsandtextmessagesarethebest.12timeisimportanttheyareparticularlyuseful.Ifhoweveryouwanttoreallyreachoutandtouchsomeonealetterismore13. Handwrittenlettersarethemostpersonal.Ifyoucantypefastyoucanfitalotintoan14.What'slackingisthatspecialsenseofthepersonthatcomesfromseeingherorhishandwriting.Aslongasit'slegible容易辨认的itdoesn'tmatterhow15itis.Whensomeonesitsdownand16justforyouyoufeelthatwhenyou'rereadingit. ThoughI'mateenagerIconfess承认thatItoofeel17toreceivealetterinthemail.Iloveseeingmy18writtenbyhandonanenvelope.Imakemyselfanicecupofcocoaorlemonadesitdownina19placeopenmyletterand20everythingthatthepersonputintothosewordsjustforme.Whatagift! 1A.play B.compare C.communicate D.deal 2A.politely B.proudly C.carefully D.easily 3A.necessary B.strange C.difficult D.curious 4A.exceptfor B.letalone C.alongwith D.insteadof 5A.changing B.achieving C.learning D.missing 6A.receiving B.collecting C.sending D.copying 7A.time B.space C.breath D.feeling 8A.Therefore B.Beside C.However D.Finally 9A.doubt B.believe C.predict D.imagine 10A.useful B.amusing C.meaningful D.cheerful 11A.seek B.convey C.find D.store 12A.Unless B.Until C.If D.Though 13A.personal B.formal C.direct D.interesting 14A.email B.book C.diary D.letter 15A.tidy B.large C.beautiful D.clear 16A.works B.thinks C.practices D.writes 17A.confident B.excited C.nervous D.surprised 18A.message B.address C.name D.idea 19A.crowded B.comfortable C.safe D.terrible 20A.explain B.remember C.understand D.enjoy
1分Greeceisoneofthe发源地oftheancientcivilazition
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Ladiesandgentlemen Youarewelcometoourschool.NowIwouldlikelytointroduceournet﹣schooltoyou. Ournet﹣schoolisveryhelpfullyinmanyways.Firstitmakesbothteachingandlearningeasierandmuchinteresting.Studentscangetmoreknowledgesinclass.Whoeverhaveacomputercanhavethelessonswegiveathome.Secondit'saccessibleforbothteachersandstudents.WecanmakegooduseoftheInternetsendinge﹣mailssearchinganyinformationweneed.Thirdthenetalsohelpsimproveourschoolmanagementbutmeettheneedsofthemoderneducation.Atlastasakeyschoolinourcityitsetsagoodexampletothenewly﹣builtschoolsandmaybeofsomehelptoit. That'sall!Thankyou.
1分IamnotfondofmusicverymuchbutIdolikemusictheyaredancingto. A.不填不填 B.thethe C.the不填 D.不填the
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6分OnedayIdrovewithmywifetospendaweekendwithmymotherlivinginthecountryside.WhenIarrivedhowevershewasn'tathome.SoIdecidedtohangoutwithouroldneighborMr.Brownwhoisafantasticwoodworker.WhenImethimhewasbuildingasmalltableinhisworkshop. Italkedwithhimforaboutforty﹣fiveminutes.DuringthatperiodoftimeIalsohelpedhimdosomesimplework.Ifoundhehadallkindsoftoolsintheworkshop.Itwasthosetoolsthathelpedhimtocreatebeautifulpiecesoffurniture. Weknowthattoolsusedbyprofessionalscanservethepurposesofeasingtheworkprocessorhelpingbeautifytheresults.Morethanlikelywe'vemadeuseoftoolstoimprovethecraftingandcompleteprojects.We'reallgratefulforcalculatorscomputersandsmartphonesfortheconveniencetheyoffer.AlongwiththesedevicesIthoughtaboutthevariousmethodsandskillsI'velearnedandintegrated融入intomydailylifeovertheyears. Ifthereisaspecificaspectofyourlifethatyoucannotovercomeperhapsyoujustneedatoolorpracticetomaketheenergyproducemuch﹣neededpower.Ifyou'restrugglingwithweightissuesorfinancialproblemstherearesomepracticalenergeticapplicationsyoucanlearn.Thesespiritualtoolscanincreaseyourability.Choosealternatethoughtsactionsandsolutions.Remembertheseareavailable. Giveyouanideaofhoweasysomeofthesepracticesare.Myten﹣year﹣olddaughterusesthematleastthreetimesaday.Forexamplewhentensionariseswithinherfriendshipcircleorifsheneedstorememberananswerforatestsheopensheronesmallboxofcandiesandcallsuponthemforassistance.Withthesetoolsshebecomessmarttocreatechangeandachievebetterresults. 1Whydidtheauthorgotothecountryside? A.Tohaveashorttrip. B.Tohaveatalkwithanoldneighbor. C.Topayhismotheravisit. D.Tolearntomakefurniturefromawoodworker. 2AccordingtotheauthorwhatmadeMr.Browncreatebeautifulfurniture? A.Theassistanceofhistools. B.Hisspecialtalents. C.Heauthor'stimelyhelp. D.Thecooperationwithothers. 3Whatisthethirdparagraphmainlyabout? A.Theachievementsofscience. B.Theimportanceoftoolsanddevices. C.Thebenefitsofapplyingtechnologytolife. D.Theconvenienceofmodernlife.
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8分Acouplehadasonelevenyearsaftertheymarried.Teywerealovingcoupleandtheboywastheappleoftheireye.Whentheboywasaroundfouryearsoldonedaytheftherwasverytiredafterworksoheaskedhiswifetopickuptheirson.Themotherwhowasverybusyinthekitchentotallyforgotaboutit. Latertheboylosthiswayonthestreet.Whenthesonwasfoundmissingthemotherhurriedtolookforhimbutshedidn'tfindhim.Themotherfeltverysadanddidn'tknowhowtofaceherhusband. Whenthefatherwenttothepolicestationafterhearingthatthesonwasmissinghelookedathiswifeandsaidjustfourwords.Whatdoyouthinkthefourwordswere?ThehusbandjustsaidIloveyoudarling. Thesonwasmissing.Ifshehadpickedhimupearlierthiswouldnothavehappened.Thereisnopointinblaming责备anyone.Hiswifehadalsolostheronlychild.Whathiswifeneededatthatmomentwascomfortandunderstandingfromherhusband.Thatiswhatthehusbandgavehiswife.Severalweekslaterwiththehelpofthepolicethecouplefinallyfoundtheirlostson.Thefamily'srelationshipbecamestrongeroverthattime. Sometimeswespendlotsoftimeaskingwhoistoblame责备Wemissmanychancestogiveeachothersupportandleteachotherfeelthewarmthofhumanrelationships关系.Getridof摆脱allyourunwillingness不乐意toforgive宽恕selfishnessandfearsandyouwillfindtheworldismuchmorewonderful. 1Whatisthemeaningoftheunderlinedphrasetheappleoftheireye? A.Apersonwhoalwayshasasweetsmileintheiropinion. B.Apersonwhoisasprettyasanappleintheiropinion. C.Apersonwhoislovedmorethananyoneelseintheiropinion. D.Apersonwholookslikeanappleintheiropinion. 2Whydidn'tthefatherpicktheboyuphimself? A.Hewasverylazy. B.Hethoughtthemotherhadpickedhimup. C.Heforgottopickhimup. D.Hewastootiredtodoit. 3Whatcanwelearnfromthispassage? A.Becarelessineverythingyoudo. B.Loveisn'tthemostimportantthing. C.Learntoforgiveothers. D.Everyonecanberight. 4Whatdoyouthinkofthehusband? A.Warmhearted. B.Careful. C.Hardworking. D.Broad宽minded.
8分Itgoeswithoutsayingthathumanintelligenceisveryadvancedasopposedtoplantsandotherlivingcreatures.People'scapacitytofullyunderstandreasonorganizesolveproblemsdisplayemotionalintelligencelearncommunicateandthinkabstractlyisout﹣standing.Itisbelievedtobemuchmoreemphasized强调nowadayswhenbrightfolksarenormallyonelevelhigherthaneveryoneelse. NowadaysmanypeopleareoftheviewthatahighintelligencequotientIQisanexcellentassistanceinpullingthroughlife.Statisticsrevealthatwhateveractivityenablingthebraintofunctionandoperatenomatterwhetherintheformofdifficultiesorotherobstaclesthatcanbeovercomebythisspecificbodyareahasapositiveeffectonit. Soeverytimeyouaremakingfulluseofyourmindforrightanswersinaquickcrosswordorifyouareansweringdifficultriddlesyoumightbeinfactraisingtheprobabilitiesofincreasingyourintelligence.YoucouldplayeffectivebraingameslikecrosswordschessriddlespuzzlesInternetgameswordgamesandothergames.Theseareusefulinraisingyourintelligenceprimarilybecausetheyletyouthinkinadifferentwayasyoumakeanefforttouncoveranswerstocertainproblems.Asidefromthisthisformofbraindrainingcontinuallyencouragesthebraintofunctionandwidenitscapacitytoconcentrateandlearn. Needlesstosayyou'vetomakesurethatyoumakethemostofthesebrainexercisesbynotcheatingyourself.Lastlyifyouprogresstoamuchmorecomplicatedleveltryyourbesttoanswerdifficultproblemswithnohintsorcluessothatyouareabletofurtherforceyourbraintoworkonitsown. 1Whatdoesthefirstparagraphmainlytalkabout? A.Thehighlevelofhumanintelligence. B.Thedifferencebetweenmankindandothercreatures. C.Thereasonsforemphasizinghumanintelligence. D.Thebenefitsofthinkingandotherbrainexercises. 2AccordingtotheauthormanypeopleincreasetheirIQinorderto. A.beonelevelhigherthanothers B.dealwithdifficultiesinlife C.playgamessuchasriddles D.enablethebraintofunction 3Accordingtothetextthroughcontinuousbraintrainingpeoplecan. A.learnacertainskillquickly B.becomeaconfidentperson C.communicatewithotherswell D.concentrateintheirclass 4Whatdoestheauthormainlyadviseinthetext? A.Makinggooduseofbrainexercisestoincreaseyourintelligence. B.Playingbraingamestopreventbraindisease. C.Solvingdifficultproblemsonyourown. D.GettingridofInternetgames.
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22.5分InAmericadriverseducationispartoftheregularhighschoolcurriculum.Everystudentinhisorhersecondyearofhighschoolisrequiredto1aclassindriverseducation. Howeverunlikeother2itisnotgivenduringthe3schoolyear.Insteaditisasummercourse.Thecourseisdividedupintotwopartsclasstimeforlearninglawsand4anddrivingtimetopracticedriving.Classtimeisnotunlikeanyotherclass.Thestudentshavea5fromwhichtheystudythebasic6theymustknowtopassthewrittendrivingtestthatisgiventoanyonewantingtogetadriver's7. Drivingtimeisachanceforthestudentstogetbehindthesteeringwheelandpracticestartsteeringbackingupparkingswitchinglanesturningcornersandalltheotheroperations8todriveacar.Eachstudentisrequiredtodriveatotalofsix9.Thestudentsaredividedupintogroupsoffour.Thestudentsandtheinstructorgooutdrivingfortwo﹣hourblocksoftime.Thuseachstudentgetshalfanhourdrivingtimeperouting.Theinstructoranddriversitin10seatsandtheotherthreestudentssitintheback. DriversEDcarsareunlikeothercarsinwhichtheyhavetwosetsofbrakesoneondriversideandoneontheothersidewherethe11sits.Thusifthestudentdrivershouldruninto12theinstructorcantakeover.Thecaralsohasanother13feature.Onthetopofthecarisasignthat14STUDENTDRIVER.Thatletsnearbydriversknowthattheyshoulduseextracautionbecausethestudentdriverisabeginningdrivernotveryexperiencedandintendedtodrive15. 1A.give B.take C.start D.seat 2A.schools B.practices C.operations D.courses 3A.basic B.extra C.regular D.special 4A.features B.regulations C.operations D.instructions 5A.text B.chance C.practice D.test 6A.laws B.skills C.signs D.parts 7A.experience B.education C.license D.curriculum 8A.separated B.intended C.required D.mixed 9A.courses B.hours C.tests D.classes 10A.driving B.passenger C.front D.window 11A.examiner B.instructor C.operator D.passenger 12A.difficulties B.blocks C.outings D.corners 13A.basic B.strange C.similar D.special 14A.reads B.writes C.warns D.tells 15A.quickly B.regularly C.practically D.slowly
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10分 HowtoMakeFriends Friendshipisaveryimportanthumanrelationshipandeveryoneneedsgoodfriends.Goodfriendshiphasmanybenefits.Itofferscompanionshipimprovesself﹣worthandpromotesgoodhealth.Therearetimesinourlivessuchaswhenwehaverecentlymovedintoanewtownorchangedourjobsorschools.Suchchangesoftenleavesuswithoutafriend1.Butformanyofustheprocessisdifficultandrequirescourage.Belowaresomehelpfulsuggestionsonhowtomakeandkeepfriends. 1.Associatewithothers. Thefirststeptomakingfriendsisassociatingwithotherpeople.Youcangotopublicplacestomeetnewpeople.Besidesyouwillneedtomakeyourselfknownbybecominganactivememberofsuchplaces. 2.Startaconversation Startingaconversationisthesecondmostimportantstepinmakingnewfriends.2Youcanalwaysstarttheconversation.Beingabletomakesmalltalkisaveryusefulskillinrelatingwithotherpeople. 3.3 Choosingfriendswithcommoninterestsisimportantinbuildingfriendshipastheseinterestswouldalwaysbringyouandyourfriendtogether.Hangingoutwillalwaysbeapleasantexperience. 4.Letitgrow. Itisagoodthingtostayintouch.Howevertrynottopressyournewfriendwithcallsmessagesorvisitsasthiswouldlikelywearhimorheroutandfinallyyoumayloseyourfriend.4Thebestfriendshipsaretheonesthatgrownaturally. 5.Enjoyyourfriendship Thebestwaytoenjoyyourfriendshipistoallowyourfriendstobethemselves.5Trynottochangethemfromwhotheyaretowhatyouwantthemtobe.Becomethekindoffriendyouwillwantyourfriendtobetoyou. A.Becheerful. B.Dothingstogether. C.Donotwaittobespokento. D.Trynottofindfaultwithyourfriends. E.Makingnewfriendscomeseasyforsomepeople. F.Forafriendshiptodevelopyouneedtostayintouch. G.Soyouwillneedtogiveyourfriendtimetoreacttoyou.
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1分我在法国时偶尔学会了一些法语. IsomeFrenchwhenIwasinFrance.
1分你觉得这部电影怎么样? doyouthefilm?
25分假定你是星光中学的李华将参加主题为Let'sRideBicycles的演讲比赛.请撰写一份演讲稿主要内容包括 1.目前汽车带来的空气污染和交通阻塞等问题 2.骑自行车的益处如节能环保有利健康等. 参考词汇低碳生活low﹣carbonlife节能energy﹣saving 注意1.词数100左右. 2.演讲稿开头和结尾已给出不计入总词数. Goodmorningeveryone IamLiHuafromXingguangMiddleSchool.ThetopicofmyspeechisLet'sRideBicycles. Thankyou.
8分FirstLadyMichelleObamaisabigfanofvolunteering.Volunteeringmeansworkingforfreetohelpsomeoneelse.Mrs.Obamasaysvolunteeringisveryimportant.Itshouldbepartofeveryone'slifeshesays. Manyteensagree.Theysaythathelpingothersfeelsgreatandmakesadifference.Thesedaysmoreteensvolunteerthanworkforpay.Teenscleanupparkswalkdogsatanimalsheltersvisittheelderlyandmore. Somecities﹣﹣﹣﹣includingSeattleChicagoandWashingtonD.C.﹣﹣﹣﹣requirehighschoolstudentstovolunteer.Studentsmustvolunteerinordertograduate.Thestudentvolunteerslearnnewskillsandhelptheircommunities. Manyparentsareinfavoroftheidea﹣﹣﹣﹣theysayvolunteeringhelpsteensbuildjobskills.Butmostteensdon'twanttobeforcedtovolunteer.Theysaytheyarebusy.Andtheysayvolunteeringisonlyfunifit'sachoice. Readbothsidesofthedebateanddecide. YES Volunteeringcanhelpteensgetintocollegeorgetajob. Manycitiesandtownsneedhelp.Volunteerscanhelpkeepimportantprogramsgoing. Notallteenswillvolunteerifitisn'trequired.Schoolsshouldrequirestudentstodoalltheycantogetreadyforadultlife. NO Mostteensarealreadyverybusywithclasseshomeworkjobsandsports.Forcingthemtodomoreisn'tfair. Itshouldbeuptoeachperson.Helpingoutdoesn'tfeelasgoodifyouhavetodoit. Findingavolunteerjobisn'talwayseasy.Studentsshouldn'tbekeptfromgraduatingbecauseofsomethingtheycan'tcontrol. 1ThewritermentionsMichelleObamainorderto. A.introducethetopicofthetext B.explainwhatvolunteeringis C.tellwhatshedoesfortheus D.showsheenjoysvolunteering 2AccordingtothetextinChicago. A.findingavolunteerjobisquiteeasy B.morepeoplewouldratherworkforpay C.volunteeringisamustforhighschoolstudents D.collegestudentshavetovolunteerbeforegraduation 3Theunderlinedpartareinfavorofinthetextmeans. A.drop B.develop C.catch D.like 4Whichquestiondoesthetextmainlydiscuss? A.Isvolunteeringgoodforstudents? B.Shouldstudentsberequiredtovolunteer C.Whatisthebesttimetovolunteer? D.Whichvolunteerjobsshouldstudentsdo?
8分 Usetheroof Ifyouhavetherightkindofroofsomeenergycompanieswillpaythecostoffixingsolarequipmentaround14000andletyouusetheenergyproducedfornothing.InreturntheygetpaidforunusedenergyfedbackintotheNationalGrid.Howeveryouhavetosigna25﹣yearagreementwiththesupplierwhichcouldpreventyoufromchangingtheroof. Useyourparkingspace Aparkingspaceorgaragewhichyouhaven'tusedcanmakemoney.Ifyouliveclosetoacitycenteroranairportyoucouldmakeanythingupto200or300aweek.PutanadvertisementforfreeonLetparkorAtmyhousepark. Rent出租aroom Notonlywillaspareroomearnyouanincomebutthankstothegovernment﹣backedrentaroomprogramyouwon'thavetopayanytaxonthefirst4500youmakeperyear.TryadvertisingyourroomonRoomspareorRoommateeasy. Makemoneyduringspecialevents Don'twantafull﹣timelodger?Thenrentonashort﹣termbasis.IfyouliveinthecapitalrentingaroomoutduringtheOlympicsorotherbigeventscouldbringinmoney.Grashpaddercanadvertiseyourspace. Liveonset Rentingyourhomeoutasafilmsetcouldearnyouhundredsofpoundsadaydependingonthefilmproductioncompanyandhowlongyourhomeisneeded.AquicksearchontheInternetwillbringupdozensofonlinecompaniesthatallowyoutoregisteryourhomeforfree﹣butyouwillbechargedifyourhomegetspicked. 1Ifinoneyearyouearn5000fromrentingaroomyouneedtopaythetaxbasedon. A.500 B.800 C.4500 D.5000 2Duringabigeventtorentoutaroomwherecanyouputanadvertisement? A.OnLetpark. B.OnRoomspare. C.OnRoommateeasy. D.OnGrashpadder. 3Ifyouhopetogetenergyfreeyoumust. A.signanagreementwiththegovernment B.payaround14000fortheequipment C.keeptheroofunchangedwithin25years D.selltherooftosomeenergycompanies 4Thetextismostprobablywrittenfor? A.Lodgers. B.Houseowners. C.Advertisers. D.Onlinecompanies
如图抛物线y=ax2﹣3ax﹣4aa<0与x轴交于AB两点直线y=x+经过点A与抛物线的另一个交点为点C点C的横坐标为3线段PQ在线段AB上移动PQ=1分别过点PQ作x轴的垂线交抛物线于EF交直线于DG. 1求抛物线的解析式 2当四边形DEFG为平行四边形时求出此时点PQ的坐标 3在线段PQ的移动过程中以DEFG为顶点的四边形面积是否有最大值若有求出最大值若没有请说明理由.
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