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曲线C的极坐标方程为C：ρ2＝，直线的参数方程为（t为参数） （1）写出C的直角坐标方程与l的普通方程； （2）直线l与曲线C相交于两点A，B，设点M（0，﹣1），求的值．
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高三下学期数学《》真题及答案
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已知在直角坐标系xOy中直线l的参数方程为t为参数以坐标原点为极点x轴的正半轴为极轴建立极坐标系曲线
在平面直角坐标系中直线l的参数方程为t为参数在以直角坐标系的原点O.为极点x轴的正半轴为极轴的极坐标
在直线坐标系xoy中曲线C.1的参数方程为t为参数a＞0在以坐标原点为极点x轴正半轴为极轴的极坐标系
在平面直角坐标系xOy中直线m的参数方程为t为参数在以O.为极点射线Ox为极轴的极坐标系中曲线C.的
已知曲线C.的参数方程为α为参数直线l的参数方程为t为参数以坐标原点为极点x轴的正半轴为极轴建立极坐
选修4—4坐标系与参数方程 在直线坐标系xOy中曲线C1的参数方程为t为参数a＞0在以坐标原点为极
在直线坐标系xOy中曲线C1的参数方程为t为参数a>0.在以坐标原点为极点x轴正半轴为极轴的极坐标系
已知曲线C.的极坐标方程是ρ=2sinθ设直线l的参数方程是t为参数.1将曲线C.的极坐标方程转化为
在直角坐标系xOy中直线l的参数方程为t为参数在以O.为极点x轴的非负半轴为极轴建立的极坐标系中曲线
已知直线l的参数方程为t为参数0≤φ＜π以坐标原点O.为极点x轴的正半轴为极轴建立极坐标系曲线C.的
已知在平面直角坐标系xOy中以坐标原点O.为极点以x轴正半轴为极轴建立极坐标系曲线C1的极坐标方程为
在直角坐标系xOy中过点P.21的直线l的参数方程为t为参数以坐标原点为极点x轴正半轴为极轴建立极坐
选修4—4坐标系与参数方程 在直线坐标系xOy中曲线C1的参数方程为t为参数a＞0在以坐标原点为极
在平面直角坐标中以坐标原点为极点x轴的正半轴为极轴建立极坐标系已知曲线C.的极坐标方程为直线l的参数
在直线坐标系xoy中曲线C.1的参数方程为t为参数a＞0在以坐标原点为极点x轴正半轴为极轴的极坐标系
在平面直角坐标系中以坐标原点为极点x轴的非负半轴为极轴建立极坐标系.已知曲线C.的极坐标方程为ρ=4
已知曲线C.1的参数方程为t为参数以坐标原点为极点x轴的正半轴为极轴建立极坐标系曲线C.2的极坐标方
已知曲线C.的参数方程为t为参数以坐标原点为极点x轴的正半轴为极轴建立极坐标系则曲线C.的极坐标方程
选修4—4坐标系与参数方程.已知曲线C.的极坐标方程为直线的参数方程为t为参数0≤＜.Ⅰ把曲线C.的
已知曲线C.的极坐标方程是ρ=6cosθ以极点为平面直角坐标系的原点极轴为x轴的正半轴建立平面直角坐
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实验室用浓盐酸与氯酸钾固体反应制ClO2时发现收集的气体中含有Cl2某研究性学习小组拟用下图装置分离混合气体并探究混合气体的组成． 【资料信息】 1．常温下二氧化氯为黄绿色气体其熔点为﹣59.5℃沸点为11.0℃能溶于水不溶于浓硫酸四氯化碳 2．ClO2具有强氧化性能与NaOH溶液反应生成等物质的量的两种盐其中一种为NaClO3． 实验1．制备与分离 1实验过程中加药品前应进行的操作是． 2D中冰水的作用是． 3多余的ClO2可用碱溶液吸收写出ClO2NaClO3与NaOH溶液反应的离子方程式． 实验2．测量与计算 反应结束后打开止水夹鼓入过量N2再测得BC装置分别增重2.0g和7.1g将D中试管收集的物质溶于水配成2.5L溶液．取25.00mL该溶液调节溶液pH＜2.0后加入足量的KI晶体振荡静置片刻再加入指示剂X用0.400mol/LNa2S2O3溶液滴定至终点消耗Na2S2O3溶液25.00mL． 己知2CO2+8H++10I﹣＝5I2+2Cl﹣+4H2O2Na2S2O3+I2＝Na2S4O6+2NaI 4鼓入过量N2的目的是． 5指示剂X为滴定至终点时的实验现象为． 6混合气体中ClO2与C12物质的量之比为． 【实验反思】 7该实验设计存在一定缺陷改进措施是．
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.
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.
短周期主族元素XYZW原子半径依次增大W是短周期主族元意中原子半径最大的元素Z原子的核外电子数是X的两倍Z与X同主族Y与Z同周期．下列说法正确的是
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
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