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直线2x+y﹣3=0与圆x2+y2﹣2x﹣2y=0相交于A,B两点,O为坐标原点,则 .
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高三下学期数学《》真题及答案
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过点P31作圆x2+y2﹣2x=0的两条切线切点分别为AB则直线AB的方程为
2x﹣y﹣3=0
2x+y﹣3=0
x﹣2y﹣3=0
x+2y﹣3=0
已知关于xy的方程Cx2+y2﹣2x﹣4y+m=0.1当m为何值时方程C表示圆.2若圆C与直线lx+
直线3x+4y-5=0与圆2x2+2y2―4x―2y+1=0的位置关系是.
相离
相切
相交但直线不过圆心
相交且直线过圆心
若直线x+my=2+m与圆x2+y2—2x—2y+1=0相交则实数m的取值范围为
(-∞,+∞)
(-∞,0)
(0,+∞)
(-∞,0)U.(0,+∞)
直线3x+4y-5=0与圆2x2+2y2-4x-2y+1=0的位置关系是
相离
相切
相交且直线不过圆心
相交且过圆心
设直线x+2y+4=0和圆x2+y2﹣2x﹣15=0相交于点A.B.1求弦AB的垂直平分线方程2求弦
圆x2+y2﹣2x﹣2y=0上的点到直线x+y﹣8=0的距离的最小值是.
已知关于xy的方程C.x2+y2﹣2x﹣4y+m=0.1当m为何值时方程C.表示圆.2若圆C.与直线
设直线x+2y+4=0和圆x2+y2﹣2x﹣15=0相交于点A.B.1求弦AB的垂直平分线方程2求弦
已知曲线方程为x2+y2﹣2x﹣4y+m=0.1若此曲线是圆求m的取值范围2若1中的圆与直线x+2y
过点-23的直线l与圆x2+y2+2x-4y=0相交于
,
两点,则|AB|取得最小值时l的方程为( ) A.x-y+5=0B.x+y-1=0
x-y-5=0
2x+y+1=0
直线3x+4y-5=0与圆2x2+2y2-4x-2y+1=0的位置关系是
相离
相切
相交且过圆心
相交不过圆心
已知直线l13x+4y﹣2=0和l22x﹣5y+14=0的相交于点P..求1过点P.且平行于直线2x
多项式3x2+2xy﹣4y2﹣2x2﹣2mxy﹣2y2中不含xy项则m=.
直线3x+4y-5=0与圆2x2+2y2-4x-2y+1=0的位置关系是
相离
相切
相交且直线不过圆心
相交且过圆心
先化简再求值2x2+2xy﹣3y2﹣2yx+﹣2y2其中x+12+|y﹣2|=0.
已知直线l3x+y﹣6=0和圆心为C的圆x2+y2﹣2y﹣4=0相交于AB两点则线段AB的长度等于.
若三条直线y=2xx+y=3mx+2y+5=0相交于同一点则m的值为________.
圆C.x2+y2+2x﹣2y﹣2=0的圆心到直线3x+4y+14=0的距离是_______
先化简再求值3xy﹣[2x2+4xy﹣2y2﹣3x2+2xy﹣4y2]其中x=3y=﹣.
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Wildlifehasbeengreatlythreatenedinthemodernage.Therearespecies物种thatare1everyday.Thewhite﹣napedcraneisatypicalexample.Soscientistsaretryingtheirbestto2thespeciesfromgoingoutofexistence. ChrisandTimworkatazoohelpingendangeredcraneswiththeir3.Emmaafemalecranehasbeenintheir4sinceshearrivedin2004. BornataninternationalcranefoundationEmmawas5byhumancaretakers.Thisledtoanunexpected6thoughshehadawonderfultimethere.Emmahad7takenherselfasacraneandbecomedeeplyattachedtohumans.She8tolivewithmalecranesandevenhada9forkillingsomeofthemwhichmadeit10forhertobecomeamother. 11thetwozookeepersdidn'twanttoseetheextinction灭绝ofthispreciousspecies.Withtheirpatienceandeffortstheysuccessfullydevelopeda12ofartificialbreeding人工繁殖andnaturalreproduction.This13Emmatogivebirthtofivebabycranes. Thetwokeepersareproudoftheirproductivework.Butbeforetheycanbe14moreeffortsmustbemadebecausethepopulationofthecraneinthewildisonthe15andmanyotherspeciesappearheadedtowardextinction.16noteveryonehasrealizedthatwildlifehasthoughtsfeelingsandmostimportantlyequalrightstosurvive. Howcanwe17theever﹣wideninggapthatseparatesusfromotheranimals?ChrisandTimofferedusthe18:humanbeingstookitforgrantedthattheir19heldallthesolutionsbutmaybetheirheartscanbeabetter20. 1A.growing B.migrating C.competing D.disappearing 2A.ban B.save C.split D.remove 3A.abortion B.recreation C.reproduction D.administration 4A.care B.eye C.mind D.story 5A.found B.chosen C.raised D.seized 6A.bonus B.consequence C.victory D.sacrifice 7A.never B.always C.unluckily D.cheerfully 8A.liked B.refused C.decided D.hesitated 9A.gift B.skill C.concern D.reputation 10A.illegal B.inspiring C.important D.impossible 11A.Therefore B.Moreover C.However D.Instead 12A.combination B.collection C.strategy D.system 13A.forced B.forbade C.taught D.enabled 14A.defeated B.grateful C.assured D.tolerant 15A.list B.rise C.agenda D.decline 16A.Incontrast B.Afterall C.Bytheway D.Onthecontrary 17A.leave B.bridge C.open D.identify 18A.course B.excuse C.answer D.reward 19A.brains B.behaviors C.services D.projects 20A.guide B.treat C.example D.companion
二醚水蒸气重整制氢过程涉及的主要反应如下 ⅠCH3OCH3g+H2Og═2CH3OHg△H=+23.6kJ•mol﹣1 ⅡCH3OHg+H2Og═CO2g+3H2g△H=+49.5kJ•mol﹣1 ⅢCH3OHg═COg+2H2g△H=+90.7kJ•mol﹣1 ⅣH2Og+COg=CO2g+H2g△H=﹣41.2kJ•mol﹣1 各反应平衡常数与温度变化关系如下表 1重整反应CH3OCH3g+3H2Og═2CO2g+6H2g△H=xkJ•mol﹣1回答下列问题 ①x= ②有利于提高重整反应中CH3OCH3平衡转化率的条件为填标号. A.高温低压B.低温__C.高温__D.低温低压 ③若在恒温刚性容器中进行重整反应达到平衡时[CH3OCH3]=10ml•L﹣1[H2O]=0.2mol•L﹣1[H2]=10mol•L﹣1[CO2]=40mol•L﹣1则反应温度约为. ④723K时v=k•[cCH3OCH3]2•[cCO2]﹣1.5为重整反应速率方程.在相同条件下cCO2分别为abc时H2产率随时间的变化关系如图1则abc由小到大的顺序为. 2CO会造成燃料电池催化剂中毒重整反应体系中CO体积分数随水醚比与温度的变化关系如图2. ①相同温度下水醚比为时CO体积分数最高. ②实际生产中选择反应温度为250℃的原因为选择水醚比为3~6的原因为.
FrostValleyYMCAisavalues﹣drivenorganizationthatencouragesyouthdevelopmenthealthylivingandsocialresponsibilitythroughoutdooreducationalandrecreationalprogramsforall.Thisaimisguidedbyoureightcorevalueswhichserveaspathwaysforourguestsastheybondwithnatureandeachother.Theyare:CaringCommunityDiversityHonestyInclusivenessRespectResponsibilityandDevotion.Learnmoreaboutourwonderfulprograms. Weoffer: BearGryllsSurvivalAcademyCamp﹣Doyouhavewhatittakestosurviveinthewilderness?Findoutintheworld'sfirstBearGryllsSurvivalCampforkids!Searchforfoodbuildshelterslearndynamicself﹣rescueandmuchmore! Counselor﹣in﹣TrainingPrograms﹣Isyourteenreadyformoreresponsibilityandtheindependenceofcollegeand/orapart﹣timejob.OurCiTslearnleadershipskillstogainresponsibilitywhilealsoparticipatinginthecharacter﹣buildingwholesomeactivitiesthatmakesummercampsospecial. MainstreamingatCamp﹣InpartnershipwiththeYoungAdultInstitutecamperswithdiverseabilitiesareacceptedinthetraditionalcampsettingalongsidetheirpartnersinanenvironmentthatencouragesgrowthforall. ClarkeSchoolPartnership﹣InpartnershipwiththeClarkeschoolcamperswithhearinglosswhocommunicateorallyarewelcomedintothecampcommunityforatraditionalcampopportunitywhereallchildrencangrowtogether. Callustodaytospeakwithourregistrarsaboutthebestfitforyourchildorteentoday!845﹣985﹣2291ext.203oremailcampregistrationfrostvalley.org. 1WhatisFrostValleyYMCAaimedat? A.Inspireyouthgrowthhealthylifestyleandresponsibility. B.Learnaboutcultures. C.Experienceatraditionalcamp. D.Helpbuildthecharacterofleadership. 2Whichcampwillyouchooseifyouwanttolearntosurviveinthewild? A.ClarkeSchoolPartnership. B.Counselor﹣in﹣TrainingPrograms. C.MainstreamingatCamp. D.BearGryllsSurvivalAcademyCamp. 3Fromwhichisthetextprobablytaken? A.Ayouthmagazine. B.Acampwebsite. C.Atravelbrochure. D.Aneducationalnewspaper.
Therearealwaysthosetimeswhenthere'ssomeoneannoyingusoverandover.1Evenwhenwecanbreakitoffweneedtodoitinawaythatwon'tcausetheirangertomakethingsevenworse.Handlingpeoplewedon'tlikerequiresthatwebothbesensitivetoourownneedsandthoseofthepeoplearoundus. 1.Don'treact. Oftenpeoplewillbotheryoutogetareaction.Trytoavoidblowinguporexpressingyourdiscontentnon﹣verbally.2Ordon'tmutter嘟囔thingsunderyourbreathorelseyoumightfeedthefire.Rememberthatsilencedoesnotmakeyouweak. 3Thinkaboutthebigpicture.Gettingintoaphysicalconfrontation冲突couldcostyouyourhealthyourjoboryoureducation.Rememberwhatreallymattersandtrytoputthesesmallannoyancesinperspective. 2.4 Ifyoucanfeelaconflictcomingbringingupsomethingdifferentcanbeagoodwaytodistractsomeone.Oftenannoyingpeoplewillbeaggressivedespitebeingobviouslywrongbecausetheyseetheconfrontationasabattleofegos自我.5 Ifforexamplesomeoneisinvadingyourspacetrydirectinghimtosomethinginyoursurroundingsthatisfunnyorinteresting.Ifsomeoneispestering纠缠youwithanannoyingtopicofconversationtrytobringupsomethingelsethatyouknowwillinterestthem. A.Beflexible. B.Changethesubject. C.Don'tpretendtoignoreit. D.Don'trollyoureyesormakemeanfaces. E.Yetweoftenhavenochoicebuttodealwiththem. F.Takeafewdeepbreathsandfocusonyourbreathingtocalmyourself. G.Onceyou'vestoppedtheirangertheymightnolongerfeeltheneedtoannoyyou.
Georgetoofar.Hiscoffeeisstillwarm. A.musthavegone B.mighthavegone C.can'thavegone D.needn'thavegone
XYZM为短周期元素原子序数依次增大YM同主族X的简单氢化物遇M单质产生白烟Z的氧化物与M的氢化物不反应可与Y的氢化物反应.下列说法正确的是
Nowadaysthefortravellingisshiftedfromshoppingtofoodandscenery. A.priority B.potential C.proportion D.pension
Twothingschangedmylife:mymotherandawhiteplasticbikebasket.Ihavethoughtlongandhardaboutitandit'strue.Iwouldbeadifferentpersonifmymomhadn'tturnedasillybicycleaccessoryintoalifelessonIcarrywithmetoday. Mymotherandfatherwereunitedintheirwayofraisingchildrenbutitmostlyfelltomymothertoactuallycarryitout.LookingbackIhonestlydon'tknowhowshedidit.Managingthefamilybudgetmusthavebeenaveryhardtask.butshemadeitlookeffortless.Ifwecomplainedaboutnothavingwhatanotherkiddidwe'dhearsomethinglikeIdon'tcarewhatso﹣and﹣sogotforhisbirthdayyouarenotgettingaTVinyourroomacarforyourbirthdayalsvishsweet16party.Wehadtoearnourallowance零用钱bydoingchoresaroundthehouse.Icanstillrememberhowlongittooktopolishthelegsofourcoffeetable.Mybrotherscannodoubtrememberhoursspentcleaningthehouse.LikethetwolittlegirlsgrowingupattheWhiteHousewemadeourownbedsnooneleftthehouseunitilthatwasdoneandpickedupafterourselves.Wehadtokeeptrackofourbelongingsandifsomethingwaslostitwasnotreplaced. Itwassummerandonedaymymotherdrovemetothebikeshoptogetatirefixed﹣﹣﹣andthereitwasinthewindowWhiteshinyplasticanddecoratedwithflowersthebasketwinkedatmeandIknew﹣﹣﹣﹣Iknew﹣﹣﹣Ihadtohaveit. It'sbeautifulmymothersaidwhenIpointeditouttoherWhataneatbasket. ItriedtoholdoffatfirstIplayeditcoolforashortwhile.ButthenIguessIcouldn'tatanditanylonger:MonpleasecanIpleasepleasegetit?I‘lldoextrachoresforaslongasyousayI'lldoanythingbutIneedthatbasketIlovethatbasket.PleaseMom.Please? Iwasdesperate. YouknowshesaidgentlyrubbingmybackwhilewebothstaredatwhatIbelieveswasthecoolestthingeverIfyousaveupyoucouldbuythisyourself. BythetimeImakeenoughit'llbugone! MaybeRogerherecouldholditforyoushesmiledatRogerthebikeguy. Hecan'tholditforthatlongMom.Someoneelsewillbuyit.PleaseMomPlease? Theremightbeanotherwayshesaid. Andsoourpayingplanunfolded.MymotherboughtthebeautifulbasketandputitsafelyinsomehidingplaceIcould'tfind.EachweekIeagerlycountedmygrowingsavingincreasedbyextraworkhereandtherewashingthecarhelpingmymothermakedinnerdeliveringorcollevtingthingsonmybikethatalreadylookednakedwithoutthebasketinfront.AndthenweekslaterIcountedre﹣countedandjumpedforjoy.Ohhappyday!Imadeit!Ifinallyhadtheexactamountwe'dagreedupon…. Dayslatertheunthinkablehappened.AneighborhoodgirlI'dplayedwithmillionsoftimesappearedwiththeexactsamebasketfixtedtohershinynewbikethatalreadyhadallthebellsandwhistles.Irodehardandfasthometotellmymotheraboutthisdisaster.Thishorribleturnofevents. Andthencamethelesson.I'vetakenwithmethroughmylife:HoneyYourbasketisextra﹣specialMomsaidgentlywipingawaymyhottears.Yourbasketisspecialbecauseyoupaidforityourself. 55.Whatcanwelearnfromthefirsttwoparagraphs? A.Thechildrenenjoyeddoinghousework. B.Theauthorcamefromswell﹣offfamily C.Themotherraisedherchildreninanunusualway D.ThechildrenwerefondoftheUSpresident'sdaughters. 56.Whentheauthorsawthebasketinthewindowshe. A.fellinlovewithit B.staredathermother C.recognizeditatonce D.wentuptothebikeguy 57.Whydidtheauthorsaymanypleasetohermother? A.Shelongedtodoextrawork. B.Shewaseagertohavethebasket. C.Shefelttiredafterstandingtoolong. D.Shewantedtobepolitetohermother. 58.ByusingnakedParagraph12theauthorseemstostressthatthebasketwas A.somethingshecouldafford B.somethingimportanttoher C.somethingimpossibletoget D.somethingshecoulddowithout 59.Totheauthoritseemedtobeahorribleturnofeventsthat A.somethingspoiledherpayingplan B.thebasketcostmorethanshehadsaved C.aneighborhoodgirlhadboughtanewbike D.someoneelsehadgotabasketofthesamekind 60.Whatisthelifelessontheauthorlearnedfromhermother? A.Savemoneyforarainyday B.Goodadviceisbeyondallprice. C.Earnyourbreadwithyoursweat D.Godhelpsthosewhohelpthemselves.
Inthe1960swhilestudyingthevolcanichistoryofYellowstoneNationalParkBobChristiansenbecamepuzzledaboutsomethingthatoddlyhadnottroubledanyonebefore:hecouldn'tfindthepark'svolcano.IthadbeenknownforalongtimethatYellowstonewasvolcanicinnature﹣that'swhataccountedforallitshotspringsandothersteamyfeatures.ButChristiansencouldn'tfindtheYellowstonevolcanoanywhere. Mostofuswhenwetalkaboutvolcanoesthinkoftheclassiccone圆锥体shapesofaFujiorKilimanjarowhicharecreatedwheneruptingmagma岩浆pilesup.Thesecanformremarkablyquickly.In1943aMexicanfarmerwassurprisedtoseesmokerisingfromasmallpartofhisland.Inoneweekhewastheconfusedownerofaconefivehundredfeethigh.Withintwoyearsithadtoppedoutatalmostfourteenhundredfeetandwasmorethanhalfamileacross.AltogethertherearesometenthousandofthesevolcanoesonEarthallbutafewhundredofthemextinct.Thereishoweverasecondlessknowntypeofvolcanothatdoesn'tinvolvemountainbuilding.Thesearevolcanoessoexplosivethattheyburstopeninasinglebigcrackleavingbehindavastholethecaldera.YellowstoneobviouslywasofthissecondtypebutChristiansencouldn'tfindthecalderaanywhere. JustatthistimeNASAdecidedtotestsomenewhigh﹣altitudecamerasbytakingphotographsofYellowstone.Athoughtfulofficialpassedonsomeofthecopiestotheparkauthoritiesontheassumptionthattheymightmakeaniceblow﹣upforoneofthevisitors'centers.AssoonasChristiansensawthephotosherealizedwhyhehadfailedtospotthecaldera:almostthewholepark﹣22millionacres﹣wascaldera.Theexplosionhadleftaholemorethanfortymilesacross﹣muchtoohugetobeseenfromanywhereatgroundlevel.AtsometimeinthepastYellowstonemusthaveblownupwithaviolencefarbeyondthescaleofanythingknowntohumans. 1WhatpuzzledChristiansenwhenhewasstudyingYellowstone? A.Itscomplicatedgeographicalfeatures. B.Itsever﹣lastinginfluenceontourism. C.Themysterioushistoryofthepark. D.Theexactlocationofthevolcano. 2Whatdoesthesecondparagraphmainlytalkabout? A.Theshapesofvolcanoes. B.Theimpactsofvolcanoes. C.Theactivitiesofvolcanoes. D.Theheightsofvolcanoes. 3Whatdoestheunderlinedwordblow﹣upinthelastparagraphmostprobablymean? A.Hot﹣airballoon. B.Digitalcamera. C.Bigphotograph. D.Bird'sview.
Unliketraditionalgymsapp﹣backedgymsofferpeopleoptionstoexercise. A.casual B.regular C.flexible D.tight
theconvenienceofdigitalpaymentmanyseniorcitizensstartedtousesmartphones. A.Toenjoy B.Enjoying C.Tohaveenjoyed D.Enjoy
Theseating1arrangeisprobablythemostimportantpartofChinesediningetiquette礼仪.Moderndiningetiquetteisenacted进行发生accordingto2principles:themasterofthefeastandguests. Theseatofhonor2reserveforthemasterortheguestwiththehigheststatusistheonefacingeastortheentrance.Thoseofhigherpositionsitclosertothemaster.Theguestsofthelowestpositionsit3farfromtheseatofhonor. Ifroundtables4usetheseatfacingtheentranceisthehonorone.Theseatsonthelefthandsideoftheseatofhonoraresecondfourthsixthetc.inimportance5thoseontherightarethird6fiveseventhandsoonuntilthey7jointogether. Inancienttimestherewasakindoffurnitureknownas8EightImmortalstableabigsquaretablewithbenchesfortwopeopleonboth9side.Iftherewasaseatfacingtheentrancetherighthandseatwasfortheguestofhonor.Ifthemealwasoutsideorthereweretwoormoredoors10equalimportancethentherighthandseatwhenfacingeastwasthehonorseat.
Themusicianalongwithhisbandmemberstenperformancesinthelastthreemonths. A.gives B.hasgiven C.havegiven D.give
DuringthewarmyhusbandwasstationedatanarmycampinadesertinCalifornia.Iwenttolivethereinordertobe1him.Ihatedtheplace.Ihadnever2beensounhappy.Myhusbandwasorderedoutonalong﹣termdutyandIwasleftinatinyshack棚屋alone.Theheatwas3﹣almost1250Fevenintheshadeofacactus仙人掌.4asoultotalkto.Thewindblewnon﹣stopandallthefoodIateandtheevryairIbreathedwere5withsandsandsand! IwassosorryformyselfthatIwrotetomyparents.ItoldthemIwas6andcomingbackhome.IsaidIcouldn'tstanditoneminutelonger.I7beinprison!Myfatheransweredmy8withjusttwolines﹣twolinesthatwillalwayssinginmy9﹣twolinesthatcompletelychangedmylife: TwomenlookedoutfromprisonbarsOnesawthemudtheothersawthestars. Ireadthosetwolines10Iwasashamedofmyself.ImadeupmymindIwouldfindoutwhatwasgoodinmypresent11;Iwouldlookforthestars Imadefriendswiththenativesandtheir12amazedme.Theygavemepresentsoftheirfavoriteartworkswhichtheyhad13toselltotoueists.Istudiedthedelightfulformsofthecactus.Iwatchedforthedesertsunsetsand14forseashellsthathadbeenlefttheremillionsofyearsagowhenthedeserthadbeenanocean15 Whatbroughtaboutthis16changeinme?Thedeserthadn'tchanged17Ihad.Ihadchangedmy18AndbydoingsoIchangedanunhappyexperienceintothemostamazing19ofmylife.IwasexcitedbythisnewworldthatIhaddicoveredIhadlookedoutofmyself﹣creatdedprisonand20thestars 1A.off B.behind C.near D.beyond 2A.before B.already C.then D.still 3A.inflexible B.incomprehensible C.uncontrollable D.unbearable 4A.Only B.Not C.Many D.Such 5A.covered B.filled C.buried D.charged 6A.catchingup B.keepingup C.givingup D.gettingup 7A.oughtto B.mightwell C.wouldrather D.hadbetter 8A.request B.call C.question D.letter 9A.comparison B.imagination C.consideration D.memory 10A.overandover B.byandby C.upanddown D.noeandthen 11A.company B.occupation C.situation D.relationship 12A.movement B.reaction C.guidance D.purpose 13A.refused B.failed C.managed D.happened 14A.asked B.hunted C.waited D.headed 15A.floor B.surface C.rock D.level 16A.shocking B.challenging C.puzzling D.astonishing 17A.as B.but C.for D.or 18A.attitude B.principle C.identity D.standard 19A.vacation B.operation C.affair D.adventure 20A.sought B.counted C.found D.reached
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