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在“测量小灯泡的电功率”实验中，提供的器材有：6V的电源一个，2.5V的小灯泡（电阻约为10Ω）一个，电流表（0～0.6A，0～3A）和电压表（0～3V，0～15V）各一个，“50Ω 2A”的滑动变...
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在测量小灯泡的电功率实验中电源电压为6V不可调节小灯泡的额定电压为2.5V电阻约为8Ω且工作时电阻变
使用如图所示的器材测定小灯泡在不同电压下的电功率已知小灯泡标有6V3W的字样电源是铅蓄电池串联组成的
实验桌上有如下实验器材符合要求的电源电流表电压表滑动变阻器小灯座小灯泡单刀开关各一个导线若干请你利用
在进行测量小灯泡的电功率实验时实验室所提供的器材有电压为6V的电源1个额定电压是3.8V.灯丝电阻约
在测定额定电压为3.8V小灯泡的额定功率实验中已知小灯泡的额定功率约为1.5W除灯泡电流表电压表开关
测小灯泡的额定功率器材有小灯泡额定电压为6V最大允许电流为0.3A一只电流表量程0-0.6A与0-3
某同学在做测定小灯泡电功率的实验中所用的电源电压为6V小灯泡的额定电压为3.8V在测定小灯泡的额定功
在进行测量小灯泡的电功率实验时实验室所提供的器材有电压为6V的电源1个额定电压是3.8V.灯丝电阻约
在测量小灯泡电功率的实验中灯泡上标有6V3W的字样电源电压为8V保持不变由于电压表的15V的量程坏了
小强做测定小灯泡的电功率实验时所用器材有电压为6V的电源额定电压为2.5V的小灯泡以及符合实验要求的
把6V3W6V6W的两个灯泡串联后分别接在6V9V18V的电源上下面说法中不正确的是
接在9V的电源上时，“6V 3W”的灯泡能正常发光
接在6V的电源上时，“6V 6W”的灯泡的实际功率是额定功率的1/9
接在18V的电源上时，“6V 3W”的灯泡比正常发光时亮，“6V 6W”的灯泡比正常发光时暗
不另加器材，无论电源电压为多少，都不能使他们同时正常发光
在测量小灯泡电功率的实验中已知电源电压是6V小灯泡的额定电压是3.8V电阻大约是8Ω1请你用笔画线代
在做测量小灯泡的电功率的实验中所选用的小灯泡的额定电压和电源电压是
1.5V，1.5V
2V，2V
2.5V，3V
3V，6V
测量小灯泡的电功率用到的器材如图甲所示已知小灯泡的额定电压为3.8V电阻约为10Ω电源电压恒为6V规
在测量小灯泡的电功率中小灯泡的额定电流为0.3A灯丝阻值在10Ω～15Ω之间所提供的器材有电流表电源
在做伏安法测灯泡额定电功率的实验中已知小灯泡的额定电压为3.8V所用电源电压为6V测量时发现学生用电
要测量小灯泡的电功率提供的器材包括小灯泡2.5V0.5A电源电压为3v电流表电压表滑动变阻器开关导线
利用传感器可以探测感受外界的信号物理条件等图甲所示为某同学用传感器做实验得到的小灯泡的U—I关系图线
现有以下器材一只电压表一只10Ω的定值电阻一个电压恒定为6V的电源一个滑动变阻器一个开关导线若干若
小聪同学要用如图的器材根据伏安法测2.5V小灯泡的电功率①请将下图中的元件连接起来.②实验中灯泡两端
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Ifyoucouldhaveonesuperpowerwhatwoulditbe? Dreamingaboutwhetheryouwouldwanttoreadmindsseethroughwallsorhavesuperhumanstrengthmaysoundsillybutitactuallygetstotheheartofwhatreallymattersinyourlife. Everydayinourworkweareinspiredbythepeoplewemeetdoingextraordinarythingstoimprovetheworld. Theyhaveadifferentkindofsuperpowerthatallofuspossessthepowertomakeadifferenceinthelivesofothers. We'renotsayingthateveryoneneedstocontributetheirlivestothepoor.Yourlivesarebusyenoughdoinghomeworkplayingsportsmakingfriendsseekingafteryourdreams.Butwedothinkthatyoucanliveamorepowerfullifewhenyoudevotesomeofyourtimeandenergytosomethingmuchlargerthanyourself.Findanissueyouareinterestedinandlearnmore.Volunteerorifyoucancontributealittlemoneytoacause.Whateveryoudodon'tbeabystander.Getinvolved.Youmayhavetheopportunitytomakeyourbiggestdifferencewhenyou'reolder.Butwhynotstartnow? Ourownexperienceworkingtogetheronhealthdevelopmentandenergythelasttwentyyearshasbeenoneofthemostrewardingpartsofourlives.Ithaschangedwhoweareandcontinuestofuelouroptimismabouthowmuchthelivesofthepoorestpeoplewillimproveintheyearsahead. 1WhatdoestheunderlinedpartinParagraph2referto? A.Yourlifestyle. B.Yourlifevalue. C.Yourtroubleinlife. D.Yourlifeexperience. 2Whydoestheauthorsaytheyareinspiredeveryday? A.Theypossessdifferentkindsofsuperpowers. B.Theyhavegotthepowertochangetheworld. C.Somepeoplearoundthemaremakingtheworldbetter. D.Therearemanypowerfulpeopleintheirlifeandwork. 3WhatdoestheauthorstressinParagraph5? A.Learningmoreandcontributingmoretoacause. B.Risingaboveselfandactingtohelpothers. C.Workinghardtogetabiggeropportunity. D.Tryingyourbesttohelpthepoor. 4Whatcanbeinferredfromthelastparagraph? A.Theauthorbelievesthelivesofthepoorestwillgetbetter. B.Muchmoreprogresswillbemadeinthenearfuture. C.Theworkonhealthisthemostvaluableexperience. D.People'seffortshavebeenmateriallyrewarded.
下列命题正确的是
若关于x的一元一次不等式组的解集是x≤a且关于y的分式方程-＝1有非负整数解则符合条件的所有整数a的和为
singledose剂量ofanexperimentalvaccine疫苗canprotectmiceagainsttheZika寨卡virusraisingrenewedhopeofavaccineforhumanssayscientists.TheUSteamsaytheresultspublishedinNaturearestrikingandshouldencourageresearchefforts. Testsinhumanscouldbegininmonths.Butevenifthesegowellalicensedvaccineforwidespreadusetoprotectthoseatmostrisk—suchaspregnantwomen—wouldstillbeyearsawayexpertsadvise.ZikahasbeenspreadingacrossCentralandSouthAmericaandmostrecentlyAfrica.Morethan60countriesandterritoriesnowhavecontinuingtransmission传播ofthediseasewhichiscarriedbymosquitoes.Theviruscausesseriousbirthdamagesduringpregnancyandhasbeendeclaredaglobalpublichealthemergency. Nowdevelopingavaccineforpregnantwomentoprotecttheirunbornbabiesisaninternationalresearchpriority优先事项.USscientistsfromtheWalterReedArmyInstituteofResearchtheBethIsraelDeaconessMedicalCenterandHarvardMedicalSchooltestedtwotypesofZikavaccineinmice—onebasedonbitsofgenetic基因的codefromthevirusandanotherthatisaninactiveandthereforeharmlesscopyofZika.Bothworkedwellprotectingeverymousethatwasimmunisedagainstthevirus.IncomparisonallofthemicenotgiventhevaccinecaughtZikaaftertheywereexposedtoit. Researcherssaytheywillpushaheadwithdevelopingtheneededvirusvaccine.TherearemanyexistingvaccinesforotherdiseasethatusethistypeoftechnologywhiletherearerelativelyfewDNA—basedvaccines.Ofcoursefuturetestswillneedtocheckthevaccineissafeandeffectiveinhumansaswellashowlongtheimmunitymightlast. 1Ifthetestsinhumansgosmoothly. A.avaccineforuseinthelaboratorywillbestillbeyearsaway. B.pregnantwomeninAfricawillbethefirsttobenefitfromthevaccine. C.alicensedvaccinewillstillnotbeaccessibleinashortterm. D.TheZikaviruswillcauselessseriousbirthdefectsduringpregnancyinmonths. 2WhichofthefollowingstatementsisNOTtrue? A.manycountriesareactivelyinvolvedintheresearchoftheZikavaccine. B.USscientistshavetestedmorethantwotypesofZikavaccineinmice. C.NoneofthemicegiventhevaccinecaughtZika. D.Itisstillunknownwhetherthevaccineissafeandeffective. 3Whichcanbethebesttitleforthepassage? A.Zikavaccineworksverywellinmice B.Zikavaccinestillhasalongwaytogo C.InternationalresearchesintoZikahavepaidoff D.MoreattentionhasbeenpaidtoZikavaccine
HotelguestsinChinamightno1longhavetoworryaboutwaitinginlinetocheckin.AttheAlibaba'sfuturistichotelsguestscanscantheirIDstakeaphotoandinputpersonaldetailsusingamachinetocheck2theyin.Thesmartequipmentwillthenprovidearoomkeycardaftertheinformation3check.Theprocesswilltakelessthanaminuteaccordingtocompany.TargetingonlyChinesecustomersfornowthenewservicewillbe4gradualexpandedglobally.Therapidgrowthofmobileusageandmobilepaymentadoptioncanshow5convenientpeople'slifeisbecominginChina. Alibabaisn'ttheonlycompany6introduceshigh—techhotels.SmartLYZaShenzhen—basedcompanywhichfocused7developingAItechnologyandsmarthotelsopenedthefirsteverfullyautomated自动化hotelinChengduSichuanbackinJanuary.8travelcanbookaroomthroughSmartLYZ'sWeChatwebsitecheckinthroughafacialrecognitionmachineunlockthedoorwitha9givepasscodeorthroughitsmobileappandfinallycheckoutbypressingabuttonontheapp.TheAISmartRoomwillundoubtedlybeextremelyattractiveforguests10createthewayforanewlevelofmodernizationandconsumers'satisfaction.
Inthefarawaylandtherewasabeautifulkingdomwithitsuniquerule.Therulesaideveryonemaybecomethekingwithallofhisrightstogovernthecountryforfiveyears.Afterthathemustbecaughthisbodywillbetiedandhewillbethrownawaytoaremoteislandwherethejungleisthickandthereareplentyofwildanimalsandnohuman.Thenonebyonepeoplebecametheking.Thefirstmansaid'OkI'mreadytobetheking.'Andhebecameakingforfiveyears.Whathedidinhisfiveyearswasenjoyinghisposition.HethrewbigpartieswenttomanybeautifulplacesmarriedmanywomencollectedmanyluxuriousthingsanddidotherthingsthatpleasedhimselfThosewereallhedidandheneverpreparedanythingforhisfuture.Untilonedaythetimecame.Onemorningwhenthekingwokeupsuddenlystrongsoldierscametohispalaceandsaid'Wecamehereundertheorderofconstitution.Nowit'stimeforyoutobethrownawaytotheremoteisland.'Thekingwasn'tsurprisedbuthefeltthattimepassedbytoofast.Hehadenjoyedhimselfinthepastfiveyearsbutnowhehadtoaccepthisdestinywithtearsinhiseyes.Thesoldierssenthimtothedangerousislandandleft.Alltheyheardwasthevoicesofthewildanimalsandthelongscreamoftheformerkingandthensilentagain.Everyotherkingwasthesameuntilayoungmancameanddeclarehiswish.Bytheconstitutionhewasgrantedhiswish.Hewouldbeahugforfiveyearsbeforebeingthrownawaytotheisland.Butifotherkingswouldfollowtheirpassionforhavingfunhedidn't.Thekingwasalwaysseentobethinking.注意1所续写短文的词数应为150左右.2应使用5个以上短文中标有下划线的关键词语.3续写部分分为两段每段的开头语已为你写好4续写完成后请用下划线标出你所使用的关键词语.Paragraph1Andnotverylongafterthathemadeasurprisingdecision.Paragraph2Finallythetimecamewhenthekinghadtobethrownawaytotheisland.
下列估测最接近实际情况的是
阅读下面短文根据其内容写一篇60词左右的内容概要.'Meltingpot'meansaplacewherepeoplefrommanydifferentethnicgroupsorculturesformaunitedsociety.Theideacomesfromheatingmetalinacontainer.Whentheymeltthemetalsuniteandbecomesomethingnewandstronger.ThetermhasbeenusedtodescribetheUnitedStatesasanationcreatedfrompeoplewhocameherefrommanydifferentcountries.AFrenchmanwhowaslivinginAmericaexpressedtheideamorethan200yearsago.J.HectordeCrevecoeurpublishedabookcalled'LettersFromanAmericanFarmer'in1782.HewrotethatAmericanhadpeoplefrommanydifferentcountries.Hesaidthattheywouldbecomeanewpeoplewhoseworkwouldonedaychangetheworld.FormanyyearsAmericansgenerallyacceptedtheideaoftheircountryasameltingpot.Theywelcomedimmigrantsfrommanynations.Thoseforeignpeoplesettleddownlearnedthenewlanguageandbuilttheirlifeonthisnewland.Yetsomeofthoseimmigrantscriticizedthemeltingpotidea.TheyfelttheywereforcedtolosetheircultureandlanguageinordertobeacceptedinAmerica.Otherpeoplealsocriticizedtheidea.Theysaidtheaimofthemeltingpotistomakedifferentculturesdisappearintotheonerepresentingthelargestgroup.NewgroupsofimmigrantsfromAsiaandLatinAmericaarechangingtheUnitesStatestoday.SomeareresistinglearningAmericancultureandlanguageTheykeeptotheirowncustomsreligiousandlanguages.ReporterssaysomeAmericansfearthatthenationisseparatingintomanygroupsthathavenosharedpurpose.Otherssaythemeltingpotisnolongerchangingthenation'simmigrantsbuttheimmigrantsarechangingAmericawiththemanydifferentculturestheybringwiththem.SomeexpertswhostudyimmigrationsaytheynowcompareAmericansocietynotwithameltingpotbutwithasaladbowl.Asaladismadeofmanydifferentfoods.Theyeachkeeptheirowntastewithoutinfluencingotheringredientswhilebeingpartofasuccessfulproduct.InthiswayculturalgroupskeeptheircustomsandlanguagesandarestillpartofAmericansociety.
某公司快递员甲匀速骑车前往某小区送物件出发几分钟后快递员乙发现甲的手机落在公司无法联系于是乙匀速骑车去追赶甲．乙刚出发2分钟时甲也发现自己手机落在公司立刻按原路原速骑车回公司2分钟后甲遇到乙乙把手机给甲后立即原路原速返回公司甲继续原路原速赶往某小区送物件甲乙两人相距的路程y米与甲出发的时间x分钟之间的关系如图所示乙给甲手机的时间忽略不计．则乙回到公司时甲距公司的路程是米．
WangWhat'sG.P.A.? SmithG.P.A.stands1thegradequalitypointaverage.Qualitypointsareused2determinethestudents'rankinclassacademichonorsandacademicwarningandprobationorsuspension. WangHowcanIlistmyoverallundergraduateG.P.A.3use3digits? SmithIthinkit'sdifficulttochangeyourgrade4G.P.A.asoursystemofgradingisdifferentfrom5inyourcountry.I'dliketoadviseyoutosubmityour6officetranscripts文字稿ofallpreviousundergraduateandgraduatework. WangThat'sagoodidea.ItookTOEFLlastyear7Ihaven'ttakentheGRE.What'stobedone? SmithTheGREmay8requirebytheparticulargraduateorprofessionalprogram.YoushouldgoovertheTableofProgramcarefully.What'syourTOEFL9? Wang630. SmithWonderful.IngeneralthegraduatedivisionrequiresaTOEFLscoreofatleast575.Those 10TOEFLscoresareintherange500—575areadmittedconditionallyuponsuccessfulcompletionoffurthercourseworkinEnglishasasecondlanguage.
一个不透明的布袋内装有除颜色外其余完全相同的3个红球2个白球1个黄球搅匀后从中随机摸出一个球记下颜色后放回搅匀再从中随机摸出一个球则两次都摸到红球的概率为．
Bothmenandwomenarelivinglongerthesedaysinindustrializedcountries.1Ingeneraltheycanexpecttolivesixorsevenyearsmorethanmen.Onereasonforthisisbiological. Oneimportantbiologicalfactorthathelpswomenlivelongeristhedifferenceinhormonesbetweenmenandwomen.2Betweentheagesofabout12and50womenproducehormonesthatareinvolvedinfertility生育能力.Thesehormonesalsohaveapositiveeffectontheheartandbloodflow.Infactwomenarelesslikelytohavehighbloodpressureortodiefromheartattacks. 3Theyhelpthebodydefenditselfagainstsomekindsofinfections.Thismeansthatwomengenerallygersicklessoftenandlessseriouslythanmen.Thecommoncoldisagoodexamplewomenonaveragegetfewercoldsthanmen. 4Scientistsarestillnotexactlysurehowinfluenceagingbuttheybelievethattheydo.Somethinkthatawoman'sbodycellshaveatendency向toagemoreslowlythanaman's.Othersthinkthataman'sbodycellshaveatendencytoagemorequickly.5 A.Howeverwomenonaveragelivelonger. B.Thebiologicalfactorplaysanimportantpart. C.Womenarealsohelpedbytheirfemalegenes. D.Thefemalehormonesalsoprotectthebodyinanotherway. E.Recentresearchseemstosupportbothofthesepossibilities. F.Thereforewomenaremorehealthythanmenandcanliveabetterlife. G.Hormonesarechemicalswhichareproducedbythebodytocontrolcariousbodyfunctions.
九章算术中有这样一个题今有甲乙二人持钱不知其数．甲得乙半而钱五十乙得甲太半而钱亦五十．问甲乙持钱各几何其意思为今有甲乙二人不知其钱包里有多少钱若乙把其一半的钱给甲则甲的数为50而甲把其的钱给乙则乙的钱数也为50问甲乙各有多少钱设甲的钱数为x乙的钱数为y则可建立方程组为
Isthereabestwaytopackclothes?Thefollowingideasareofgreathelptothosewhoarealwaysontheway. Wheretostart? 1Onceyouseehowmuchyoulayinfrontofyoubebraveandreduceaboutathird.Becausethetruthislikeyourwardrobeyouneverseemtouseasmuchasyoutake. Howtodealwithclothing? Startwithyourshoes.Putunderwearorsocksinsidethemtoholdtheshapeofyourshoes.Thusyoucanmakeuseofeverysquareinchofspace.Onceyourshoesarefirmlyinplacefillsmallgapswithverysoftitems.2 Layoutthefirstclotheswithoneendinsidethesuitcaseandtheotherenddroppingovertheedge.Putthenextclothesontopofthisbutplacethemtheotherwayaround.3Inthiswayyou'llgetanotherflatlayersoonFinallyonebyonefoldtheclothesbackin. Wheretoputnon—clothing? 4Theseawkwardshapeditemsaredifficulttopack.You'dbetterputthemtowardsthemiddlegivemaximumprotection.Remember.todoublebagyourtoiletrieskit洗漱袋toavoidspottingyourclothes. Toptips: Ifyoutakeabeltslipthemalongtheinsideofyourcase.5Thatwilltakemorespace.Nextusethehardshapeofthecasetoofferprotection.Leaveyourtoiletrieskitinyoursuitcasewhenyoureturnhome.It'sreadyforthenexttimeyoutravel. A.Don'trollbeltsup. B.Besuretoputawaysocks. C.Thisideawillcreateaflatfirstlayer. D.Andthencontinuelayingotherclothes. E.Thatwillmakethejobawholeloteasier. F.Layeverythingyouwanttotakewithyouonthebed. G.Non—clothingitemsarethingslikebookstoothbrushesandcameras.
Findingamountaingoatrestinghighonacliff悬崖mightthrillmanyofthemillionsoftouristswhovisitWyoming'sGrandTetonNationalParkeveryyearbutparkofficialssayitmightbetimeforthebeardedanimalstogo. TheproblemaccordingtotheparkisthatGrandTeton's100orsomountaingoatsthreatenabout80bighornsheep.Thebighornsheepnumberedasmanyas125justafewyearsago.Thestronggoatsspreaddiseaseandcompetewithbighornsheepforfood.Unlikesmall—sizedbighornsheepGrandTeton'smountaingoatsaren'tnativetothepark.Theywereintroducedtotheparkinthe1960s. GrandTetonspokeswomanDeniseGermannsaidWe'vegotamanagementresponsibilitytoprotectthenativespecies.Afterhearingfromthepublicontheproposal建议inJanuaryparkofficialsexpecttodecideassoonasmid—Februaryonwhattodoaboutthemountaingoats. Thegoatsarereproducingrapidly.Nowmightbethebesttimetoreducetheanimalsbeforethey'retoomanytobringundercontrolaccordingtotheParkService. Onewildlifebiologistwhostudiesbighornsheeppraisedtheproposal.Mountaingoats'originalhabitatisnowhereclosetowherethey'vebeenintroducedintheU.S.toprovidehuntingopportunitiessaidRobRoyRameyIIwithNederlandColorado—basedWildlifeScienceInternationalInc. WildlifemanagersshouldgetridofmountaingoatsnotonlyinGrandTetonbutelsewheretohelpstrugglingbighornsheepRameysaid.UnfortunatelystatewildlifeagenciessellnonnativewildlifeviewingopportunitiestothepublicRameysaid.Thisisnotazoointhewilderness.Itshouldreallybefornativewildlife. 1Whatcanbelearntaboutthebighornsheepinthepark? A.Theirsizeishuge. B.Theirnumberisdecreasing. C.Theyarrivedinthe1960s. D.Theythreatenlocalspecies. 2Howdidthepublichelpparkofficialsprotectthebighornsheep? A.Byprovidingsuggestions. B.Bydrivingawaymountaingoats. C.Byvolunteeringinthepark. D.BytakingoverGrandTetonNationalPark. 3WhatisGermann'sattitudetowardsthebighornsheep? A.Curious. B.Proud. C.Surprised. D.Concerned. 4Whatwasthepurposeofbringinginmountaingoatsinthebeginning? A.Toofferhuntingchances. B.Tosellnonnativewildlife. C.Tosatisfywildlifemanagers. D.Toincreasediversitiesofsheep.
2019OscarsAcademyAwardNominees提名forBestPicture BlackPanther Type:Adventure RunningTime:134min. ReleaseDate:February162018 Currentrank:★★★★ Director:RyanCoogler Actors:ChadwickBosemanMichaelB.Jordan WithhisfatherhavingdiedinCaptainAmerica:CivilWarT'ChallaisthenewruleroftheadvancedkingdomofWakanda.Asthekingwheneverachallengerforthecrownannounceshisintentionshemustgiveuphispowersandtakethemoninaphysicalchallenge. TheFavorite Type:Drama RunningTime:120min. ReleaseDate:November302018 Currentrank:★★★ Director:YorgosLanthimos Actors:EmmaStoneRachelWeisz Intheearly18thcenturywithEnglandandFranceatwarafragileQueenAnneoccupiesthethroneasherclosefriendLadySarahChurchillgovernsthecountryinhersteadwhiletendingtoAnne'sillhealthandchangeabletemper. GreenBook Type:Drama RunningTime:130min. ReleaseDate:November212018 Currentrank:★★★★★ Director:PeterFarrelly Actors:ViggoMortensenMahershalaAli TonyLipanuneducatedItalian—Americanwho'sknownforusinghisfiststogethiswayishiredtodriveworld—classfamouspianistDonShirleyonaconcerttourfromManhattantotheDeepSouth.TheymustrelyontheNegroMotoristGreenBooktoguidethemtothefewsettlementsthatwerethensafeforblacks. AStarisBorn Type:Musical RunningTime:135min. ReleaseDate:October52018 Currentrank:★★★★ Direct:BradleyCooper Actors:BradleyCooperLadyGaga WhencountrymusicstarJacksonMainestopsatabarforadrinkafteraconcerthe'sbothentertainedandattractedbyyoungnightclubsingerAlly.Hediscoversthatshewritessongsaswellasbeingatalentedsingerbuthasn'thadabreakbecauseofherlooks. 1Whichfilmistheleastpopularamongaudience? A.BlackPanther. B.TheFavorite. C.GreenBook. D.AStarisBorn. 2Thefilmabouttherightsofblackpeoplebelongsto. A.adventure B.musical C.drama D.comedy 3Whoworksasadirectorandactor? A.RyanCoogler. B.YorgosLanthimos. C.PeterFarrelly. D.BradleyCooper.
如图在平行四边形ABCD中点E在边BC上连结AEEM⊥AE垂足为E交CD于点MAF⊥BC垂足为FBH⊥AE垂足为H交AF于点N点P是AD上一点连接CP． 1若DP＝2AP＝4CP＝CD＝5求△ACD的面积． 2若AE＝BNAN＝CE求证AD＝CM+2CE．
如图△ABO∽△CDO若BO＝6DO＝3CD＝2则AB的长是
每年夏季全国各地总有未成年人因溺水而丧失生命令人痛心疾首．今年某校为确保学生安全开展了“远离溺水•珍爱生命”的防溺水安全知识竞赛．现从该校七八年级中各随机抽取10名学生的竞赛成绩百分制进行整理描述和分析成绩得分用x表示共分成四组A．80≤x＜85B．85≤x＜90C．90≤x＜95D．95≤x≤100下面给出了部分信息 七年级10名学生的竞赛成绩是998099869996901008982 八年级10名学生的竞赛成绩在C组中的数据是949094 七八年级抽取的学生竞赛成绩统计表 根据以上信息解答下列问题 1直接写出上述图表中abc的值 2根据以上数据你认为该校七八年级中哪个年级学生掌握防溺水安全知识较好请说明理由一条理由即可 3该校七八年级共720人参加了此次竞赛活动估计参加此次竞赛活动成绩优秀x≥90的学生人数是多少
如图在平面直角坐标系中矩形ABCD的顶点AD分别在x轴y轴上对角线BD∥x轴反比例函数y＝k＞0x＞0的图象经过矩形对角线的交点E．若点A20D04则k的值为
计算 1x+y2-y2x+y 2a+÷
ISMisalargecompanyinSt.LouisMissouributthetopleadersarenotsatisfiedwiththeperformanceofitsstaff.Onedaynottoolongagotheemployeesreturnedfromtheirlunchbreakandweregreetedwithasignonthefrontdoor.Thesignsaid1Weinviteyoutojointhefuneralintheroomthathasbeenpreparedinthegym. Atfirsteveryonewassadtohearthatoneoftheircolleagueshaddiedbutafterawhiletheystartedgettingcuriousaboutwhothispersonmightbe.Theexcitementgrewastheemployeesarrivedatthegymtopaytheirlastrespects.Everyonewondered2Wellatleasthe'snolongerhere! Onebyonetheemployeesgotclosertothecoffinandwhentheylookedinsideittheysuddenlybecamespeechless.Theystoodoverthecoffinshockedandinsilenceasifsomeonehadtouchedthedeepestpartoftheirsoul.3TherewasalsoasignnexttothemirrorthatsaidThereisonlyonepersonwhoiscapabletosetlimitstoyourgrowthitisYOU. Youaretheonlypersonwhocanrevolutionizeyourlife. 4 Youaretheonlypersonwhocaninfluenceyourhappinessyourrealizationandyoursuccess. Yourlifedoesnotchangewhenyourbosschangeswhenyourfriendschangewhenyourparentschangewhenyourpartnerchangeswhenyourcompanychanges. YourlifechangeswhenYOUchangewhenyougobeyondyourlimitingbeliefs5 A.Therewasamirrorinsidethecoffineveryonecouldseethepersonwhopassedaway B.Whoisthepersonthatpassedaway? C.whenyourealizethatyouaretheonlyoneresponsibleforyourlife. D.Amirrorinsidethecoffineveryonewholookedinsideitcouldseehimself E.Yesterdaythepersonwhohasbeenlimitingyourgrowthinthiscompanypassedaway. F.Youaretheonlypersonwhocanhelpyourself G.Whoisthispersonthatwaslimitingyourprogress?
Ask9﹣year﹣oldAnniewhattheworstthingwasthateverhappenedinherhouselastyearshewon'ttellyouthatitwasherparentsdivorcingalthoughtheydid.NowhatAnnieremembersmostarethehorriblefightsleadinguptotheannouncementaboutthedivorcewhichwasasturnedoutanddespiteherparentsanxietyabouttellinghernotthatbigofadeal.IalreadyknewtheywerenotgettingalongwellAnniesaysEverynightafterIwenttobedIwouldhearmyparentsfighting.Itmademereallyunhappy.Whentheyfinallydecidedtogetadivorceallthatstopped. Annie'sexperienceismorecommonthanyoumightthinkandthereisagreatdealofevidencetosuggestthatstayingtogetherforthesakeofthechildrenisnotallit'scrackeduptobeandmaydomoreharmthangood.AccordingtopsychologistLynnMartingdalehearingtheirparentsargueisoftenmorestressfulforchildrenthanseparationanddivorceandifyouthinkthatyourchildrendon'tknowthatthere'stroubleinfamilythenyou'rekiddingyourself.Thehomelifeofchildrenwhoseparentshaveanunhappymarriageisoftenfarfromidealandwhat'sworseparentswillcompoundtheproblembytakingtheirunhappinessoutonthechildren. TheCenterforMovingForwardconductedastudyin2014inwhichtheyfollowed25familieswhoseparentshadbeeninmarriagecounseling.Aftertrackingthesefamiliesfor5yearstheyfoundthatthechildrenoftheparentswhohadeventuallygottendivorcedwerenotworseoffthanthechildrenofthosewhohadremainedtogetherandinsomecaseshadfaredbetter.Thestudytookintoconsiderationsocialandthechildren'sgeneralsenseofwell﹣being. 1WhywasAnniereallyunhappyaccordingtoparagraph1? A.Herparentsfoughteverynight B.Herparentsfinallygotdivorced C.Herparentsdecidedtoabandonher D.Herparentsgotalongbadlywithher. 2WhichstatementmaypsychologistLynnMartingdaleagreewith? A.Separationanddivorcewillhurtthechildrenmost. B.Keepinganunhappymarriagehurtschildrenmore C.Childrencantunderstandtheirparents'marriagewell D.Childrencan'tfeeltheunhappinessfromtheirparents 3What'sthefunctionofthelastparagraphinthepassage? A.Togiveanexampleofdivorce B.TosupportAnnie'scorrectanswer C.Tofurthercleartheauthor'sviewpoint D.Tohighlighttheimportanceofthestudy 4Whatisthebesttitleforthepassage? A.DivorceIsGoodforChildren B.DivorceIsNottheWorstThing C.FightingIsOftenStressful D.StayingTogetherIsforChildrenOnly
Thegiantpanda1lovebypeoplethroughouttheworld.Chinesescientists2recenthadachancetostudyawildfemalepandawithanewbornbaby.Shewasavery3caremother.For25dayssheneverleftherbabynoteventofindsomething4eat!Shewouldnotletanyotherpandascomenear.Shelickedthebabyconstantlytokeepitclean.Anysmellmightattractnatural5enemythatwouldtrytoeatthelittlepanda.Themotherheldthebabyinherfrontpawsmuchthewayahumandoes.6itcriedsherockeditbackandforthandgaveitlittlecomfortingpats.Themothercontinuedtocarefortheyoungpanda7morethantwoyears.Bythattimethepandanolongerneeded8itmotherforfood.Howeveritstayedwithherandlearnedaboutthewaysoftheforest.Thenaftertwoandahalfyearsthemother9drivetheyoungpandaaway.Itwastimeforhertohaveanewbaby10itwasalsotimefortheyoungpandatobeindependent.
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处语言错误每句中最多有两处.每处错误仅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1划掉. 修改在错的词下划一横线并在该词下面写修改后的词. 注意1.每处错误及其修改均仅限一词; 只允许修改10处多者从第11处起不计分. AsmythirdyearofhighschoollifehascomeIfeltalittlestressfulbecauseIwanttoenterabettercollegeandmyscoresworryme.Ihavemademymindtostudyharder.FirstlyIneedtoimprovingmyweaksubjects.Idecidetogoovertheimportantknowledgesandaskmyclassmatesforhelp.MygoodfriendLilyisverypatient.WithherhelpIwillmakeagreatprogress.SecondlytheexampapershandouteverytimeIwillscanmymistakesandmakesurewhattomakethemright.FinallyIwillmakefullyuseofmysparetime.Ibelievetheaimwillmakeyoustronger.
在初中阶段的函数学习中我们经历了“确定函数的表达式--利用函数图象研究其性质一一运用函数解决问题“的学习过程．在画函数图象时我们通过描点或平移的方法画出了所学的函数图象．同时我们也学习了绝对值的意义|a|＝． 结合上面经历的学习过程现在来解决下面的问题在函数y＝|kx-3|+b中当x＝2时y＝-4当x＝0时y＝-1． 1求这个函数的表达式 2在给出的平面直角坐标系中请用你喜欢的方法面出这个函数的图象并写出这个函数的一条性质 3已知函y＝x-3的图象如图所示结合你所画的函数图象直接写出不等式|kx-3|+b≤x-3的解集．
假定你是李华想邀请网友Peter下周六参观你校举办的科技小发明technologygadgets展览.请给他写封邮件内容包括: 1.具体时间和地点; 2.展览目的和内容. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯;
计算π-30+-1＝．
Nowitwastimeforthewheattocomeintotheearsbuttheweatherwassodrythattheoldmen'shairwasturninggreyoutofconcern.Thismorning.thecloudswererollingandthethunderswere1.Itbegantopoursoon.Finallytheoldfarmerswhowerelookingforwardtotherainhappilyrantothe2ofthefieldlookedattherain﹣fedcropsandmadea3totheskyexcitedly. Astonelyingonthegroundwitnessedthisandwasveryunhappyaboutit.Itsaid4Ohitseemsthateverythingishappyforit!Itseemsthattherainwereaninternationalguestof5butwhatdiditdo?Ithasonlybeentwo6threehours.What'sthebigdeal?Nonsense!ThestonelookedathimselfandsaidYes.IhavelivedhereforthousandsofyearsIhavebeenso7andpolitebutnoonecomesto8meandthankme.Theworldisso9.It's10thatIoftenhearpeoplesaytheworldisugly. Shutup!Aninsectlistenedimpatientlyand11thestonewithafirmtoneTheraindoesnot12longandsometimesevenremainsatmostonehourbutrainismoisteningtheearthWiththe13oftherainwaterthefarmerscangetharvestand14livinghereforhundredsofthousandsofyearsinthefieldyouarecompletelyuseless.Notonlythatbutyouarestill15thispieceofrichsoil.Youarejustapieceofuseless16Whogotanygoodfromyou?Youareworthlessisn'tit?Thestonewas17andbowedhisheadin18. Similartothisstonesomepeopleliketoboast自吹自擂oftheirfortyyearsofhardlaborandtheir19tothepeople.Whatistheessentialdifferencebetweenthem?Noonehasreceivedanybenefitsfromthemandwhatisthe20oftheirexistence? 1Aflashing Bappearing C.booming Dhappening 2A.center B.edge C.bottom D.top 3A.bow B.choice C.Decision D.hit 4A.enthusiastically B.disgustingly C.enviously D.deliberately 5A.honor B.pleasure C.pity D.trouble 6A.and B.to C.or D.till 7A.hopeful B.modest C.helpful D.comfort 8A.inform B.greet C.praise D.comfort 9A.unfortunate B.unfair C.awkward D.impressive 10A.nodoubt B.nopain C.noway D.nowonder 11A.interrupted B.refused C.disturbed D.interviewed 12A.arrive B.leave C.last D.lie 13A.instructions B.leadership C.guides D.aid 14A.infavorof B.inhonorof C.inspiteof D.inmemoryof 15A.takingoff B.takingup Cholding D.holdingup 16A.carriage B.baggage C.space D.field 17A.cheerful B.hopeless C.thankful D.speechless 18A.shame B.pride C.sigh D.comfort 19A.devotion B.determination C.inspiration D.courage 20A.assessment B.value C.importance D.base
Nowadayswecanreadalmostalltruthsonsocialmediasites.Butaretheyreallyreliable?Sitessuchasthemicro﹣messagingserviceTwitterthesocialnetworkingsiteFacebookandthephoto﹣sharingappInstagrammightmisrepresenttherealworldaccordingtoastudybycomputerscientistsfromMcGillUniversityandCarnegieMellonUniversity Thescientistswarnthatgatheringinformationaboutpublicviewsandtrendsfromthesesitesisunwise.Therearestilllargepartsofthepopulationwhodonottakepartinsocialmediaactivities.Alsothere'sariskthatmanysocialmediausersareunder﹣represented.InstagramforexampleappealstoyoungeradultsinurbanareaswhilePinterestisusedmainlybyfemalesaged25to34.Andonly5percentofTwitterusersareover65yearsoldaccordingtothestudyHoweverthisisnottheonlyissueaccordingtothescientificteam.ThedesignofawebsitecaninfluencehowpeoplebehaveonlinecreatingwhattheresearcherscallInternetbiasForexamplemicro﹣bloggingsitessuchasWeibopromotepopularstories.Itsavestimeforsomebutitalsolimitsreaders'choiceofwhattheysee.IntheendmanypeopleopenthosestoriesandmakethemmorepopularButit'snotbecausetheychoosethosestories.Ratheritisbecausethecontentisrightinfrontofthem. Besidesit'spossiblethatnoteveryoneonyoursocialnetworksisreal.Theremightactuallybeafewfakeaccountsamongthem.Fakebotspretendtobehumanandareoftenincludedwhenmeasuringorpredictinghumanbehaviorsonline. ThefindingsmightbemoreimportantthanyouwouldthinksincemanysocialmediastudiesareusedtoinformandjustifydecisionsandinvestmentsamongthepublicandinindustryangovernmentsaidDerekRuthsassistantProfessoratMcGillaSchoolofComputerScience. IftheteamisrightyoumighthavetothinkcarefullythenexttimeyousayIt'strueyouknow;IreaditonWeibo. 1WhydoestheauthormentionTwitterFacebookandInstagram? A.Becausetheyarethebestsocialmediasitestoday. B.Becausetheyarenotinfavorofthecurrentstudy. C.Becausethepublicaresharingtruthsonthesesites D.D.Becauseinformationonthesesitesmaynotbereliable. 2Howisthepassagedeveloped? A.Bygivingexamples B.Bymakingcomparisons. C.Bydividingintogroups D.Byanalyzingcauseat 3Whichwordcanbestdescribetheauthor'sattitudetowardinformationonsocialmediasites? A.Ambiguous B.Favorable C.Disagreeable D.Cautious 4What'stheauthor'smainpurposeinwritingthepassage? A.Toanalyzewhyinformationgatheredfromsocialmediasitesmaynotbetrustworthy. B.Toremindreadersofthingstheyshouldwatchoutforwhenusingsocialmedia. C.Topointouttheadvantagesanddisadvantagesofsocialmedia. D.Torecommendpopularsocialnetworkingsitesforreaders
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