首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
在平面直角坐标系中，倾斜角为α的直线l的参数方程为（t为参数）． （Ⅰ）以坐标原点O为极点，x轴非负半轴为极轴建立极坐标系（与平面直角坐标系的单位长度相同），当α＝60°时，求直线l的极坐标方程；...
查看本题答案
包含此试题的试卷
高三上学期数学《》真题及答案
点击查看
你可能感兴趣的试题
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
在直角坐标系xOy中倾斜角为α的直线l的参数方程为t为参数．在以坐标原点为极点x轴正半轴为极轴的极
在直角坐标系中直线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C的极
在平面直角坐标系xOy中设抛物线y2＝4x的焦点为F.准线为lP.为抛物线上一点PA⊥lA.为垂足.
在平面直角坐标系中直线L的参数方程为为参数.在以原点为极点轴正半轴为极轴的极坐标中圆C的方程为.Ⅰ写
在直角坐标系xOy中以O.为极点x轴的正半轴为极轴建立极坐标系曲线C.ρ2﹣4ρcosθ+1=0直线
已知曲线C的极坐标方程是ρ=4cosθ．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
在平面直角坐标系xOy中倾斜角为α的直线l过点M﹣2﹣4以原点O为极点x轴的正半轴为极轴建立极坐标系
己知曲线C.的极坐标方程是ρ=4cosθ.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
选修4－4坐标系与参数方程已知在直角坐标系xOy中圆锥曲线C.的参数方程为θ为参数直线l经过定点A.
已知曲线C.的极坐标方程是.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标系直线l的
已知直线l的参数方程为t为参数若以直角坐标系xOy的O.点为极点Ox方向为极轴选择相同的长度单位建立
在平面直角坐标系xoy中圆C.的参数方程为t为参数.在极坐标系与平面直角坐标系xoy取相同的长度单位
在平面直角坐标系中直线y=-x+1的倾斜角为.
已知曲线C的极坐标方程是ρ=4sinθ．以极点为平而直角坐标系的原点极轴为x轴的正半轴建立平面直角
已知极坐标系的极点与直角坐标系的原点重合极轴与x轴的正半轴重合直线l的倾斜角为参数方程为t为参数圆C
以直角坐标系的原点O.为极点x轴的正半轴为极轴建立极坐标系已知点P.的直角坐标为1－5点M.的极坐标
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
在平面直角坐标系xoy中已知直线l的参数方程为参数t∈R.同时在以坐标原点为极点x轴的正半轴为极轴建
在直角坐标系xOy中直线l经过点P-10其倾斜角为α以原点O.为极点以x轴非负半轴为极轴与直角坐标系
热门试题
更多
Weneedtoberesponsibleforourenvironment.Beingafrugalconsumer节俭的消费者isonewaytohelp.1 UseItUp. Youcanusethingsupinsteadofwastingthem.Squeeze挤thatlastbitoftoothpasteoutofthetube.2Don'tthrowawayanybitsofthebiscuitatthebottomofthebox. WearItOut. Youdonotalwaysneedtohavenewthings.Supposeyoursneakers运动鞋havebrokenlaces鞋带buttheystillfityou.Repairthemandwearthemlonger.Youdon'thavetohavethelatestiPhoneuntiltheoldonedoesn'tworkanymore.Thenyoucangetanewone.3 MakeItDo. Whensomethingyouwantisnotonhandlookforsomethingelsethatyoualreadyhavetotakeitsplace.Supposeyouarepackingyourlunchfortomorrowandwantabuttersandwich.Youareoutofbutter.Haveacheesesandwichinsteadsoyoucanuseallofthecheese.Learntofixbrokentoysinsteadofjustthrowingthemaway.4 5Thinkaboutallthosethingsthatyouwouldliketohave.Doyoureallyneedthem?HowlongwillyoureallyplaywiththatnewtoyyousawonTV?Makingthethingsthatwewantusesupourworld'sresources资源.Andgettingridofthethingswedon'twantanymoretakesupevenmoreresourcesandspace. A.Dowithoutit. B.Throwitaway. C.Whatexactlydoesthatmean? D.Doyouknowwhattoconsume? E.Usethelastlittlepieceofsoap. F.Withalittlethoughtyoucanmakesomethingdo. G.Thinktwicebeforereplacingsomethingthatstillworks.
设函数． Ⅰ若曲线y＝fx在点1f1处的切线与直线y＝1平行求a Ⅱ若fx在x＝﹣2处取得极大值求a的取值范围．
Chinaplanstolaunch156smallsatellitesby2025toprovideInternetservicesinlowsignalareasandplaceswithadversenaturalenvironmentaccordingtoChinaAerospaceScienceandIndustryCorporationCASIC. Duetoenvironmentalconditionsofdesertsmountainsandseashalfoftheworld'spopulationhasnoaccesstotheInternetandtheinformationdeficiencyhamperslocaldevelopment. ItwillbeChina'sfirstbroadbandInternetaccesssystemwithsmallsatelliteshoveringinloworbitwhichwillalsohelpmeettheneedsofcommercialspacedevelopment. TheprojectnamedHongyunplanstosendthefirstsatelliteby2019andlaunchfourmoreby2020.Bytheendof2025CASICplanstohaveallofthe156satellitesinoperation. TheHongyunProiectwhichfocusesoncommunicationremotesensingandnavigationcanoffercommunicationandInternetservicesforChinaandless﹣developed3countrieswithreducedlatency.Meanwhiletheprojectcanalsobenefitemergencycommunicationsensordatacollectionandremotecontrolofunmannedequipment. Currentlyinternationalmaritimesatellitesarewidelyusedincommunicationsinmountainousareasandairplanesbutthosesatellites36000kilometersabovetheEarthhavetimeandsignaldelayaswellashighcostforprovidingservices. ThesmallsatellitessentbytheHongyunProjectwillhoverinloworbitsonlyhundredsofkilometersto1000kilometersabovetheEarthandthuscouldimprovetheInternetaccess.Howevertheloworbitsatellitesmayfacechallengesinpowersupplyastheyneedmoreenergytoreducetheinfluenceofair﹣resistancecomparedtohighorbitsatellites.Experimentsareneededtodeterminewhethersolarenergyaloneisenough. 1Accordingtothepassage. A.156satelliteswillbelaunchedbytheHongyunProjectby2020 B.internationalmaritimesatellitescancausesignaldelay C.TheHongyunProjectmaynotencouragecommercialspacedevelopment D.loworbitsatellitesarecurrentlyusedwidelyincommunicationsinmountainousareas 2TheunderlinedwordhampersinParagraph2probablyrefersto. A.accelerates B.determines C.prevents D.promotes 3WhichofthefollowingisnotincludedintheHongyunProject? A.CommunicationandNavigation. B.Remotesensing. C.Datacollection. D.Solarenergy. 4Loworbitsatellitesneedmoreenergyinorderto. A.providemoreaccuratedata B.improvetheInternetaccess C.reducetheeffectofair﹣resistance D.facemorechallenges
WhilemanycountrieslovetheirteaUKcitizensareparticularlyproudofbeingteapeople.TheaverageUKcitizenconsumesnearly2kilogramsofteaeachyear. TeaonlymadeitswaytoEnglandinlargequantitiesinthefirstyearsofthe17thcentury.TeafromChinaandafewotherAsiancountrieswasbeingsoldmorewidelyinEnglandatthattime.Thenteawasgettingmoreandmorepopularamongdifferentsocialclasses. Therearemanyvarietiesoftea.BlackteamixturesarestillthemostcommontypedrunkintheUK.Blackteaisdarkincolourbecausetheleaveshavebeenallowedtooxidize氧化beforedrying.Thisiswhyweusuallyserveitwithmilkalthoughitisnotuncommontodrinkitblackorwithlemon.Youmaystillfindteamadewithloosetealeavesservedupinapotandpouredintothebestchinacupswithsaucers茶托forvisitors. TeaisstillalargepartofdailylifeintheUKtodaybutitseemstobeonthedecrease.TheamountofteasoldintheUKfellbymorethan10%inthefiveyearsleadingupto2002andhasbeendroppingeversince.Teasalesfellby6%in2014aloneandmostrestaurantsreportsellingmorethantwiceasmanycupsofcoffeeastheydotea.Morethan￡1billionwasspentoncoffeeinhighstreetstoresin2013morethantwicewhatwasspentonteabags. Stillwhatgoesaroundcomesaroundit'ssuretobecomefashionableagain. 1Whichofthefollowingistrueaccordingtothefirstthreeparagraphs? A.TeamadeitswaytoEnglandintheearlyyearsofthe16thcentury. B.TheUKusuallyservesblackteawithlemon. C.TeafromChinawasbeingsoldmorewidelyinEnglandnow. D.UKcitizenstakeprideinbeingteapeople. 2Whatcanweinferfromthefourthparagraph? A.Teasalesfellby6%in2014alone. B.Since2002thesalesofteahasbeenonthedecrease C.In2013themoneyspentonteawas￡3billion D.Mostrestaurantlikesellingteathancoffee. 3Whatdoestheunderlinedsentencemeaninthelastparagraph? A.Itcanneversucceedagain B.Theteacanbecomepopularagain C.Coffeeismorepopularthantea D.Theteaisbecominglesspopular 4Whatistheauthor'spurposeinwritingthetext? A.TointroduceteaintheUK B.Toshowtheauthor'spreferencefortea C.Tointroducethefunctionsoftea D.TocompareteainChinaandUK
函数fx＝则f[f0]．
WintersarealwayslongandcoldinNorthChina.Thewinterof2008wasespeciallytoughinonesouthwesterncity1itbecameextremelycoldanditwasalsoadifficulttimeforme.Whatwasworsean2injuryhappenedtomeanditmightkeepmeinbedforseveralmonthsJustintimefortheSpringFestivalmymothersaidtomesighing.ButhowcouldIfeelthe3whenthesnowwassoheavyandIhadmonthsofphysical4ahead? OnedayIwasdoingmyhousework5therewasatapagainstthewindowfromabranchofthetroublesomefruittree.OnhearingthiswithmyeyesclosedslowlyIbegantorecallthefallof1995whensomebodyplacedapipefrommypumpnexttothe6.Theearthwassowetthatit7immediatelywithmostitsbarerootsupward.Seeingthismymother8topullitoutbutIrefused.Howhardit'strying!Isaid9thedirectionofitsstrongholdingoftheearth.Itis10ofachancetosurvive.Withtoolswe11drysoilaroundthetreeandputupsomesupportsintothegroundmakingit12upright. SeveralmonthshadpassedbeforeIcouldbe13ofit.Surprisinglywhenspringreturnedmyrescue14hadgrownsomeleavesandmany15.In2009thatlittlerescuestickhadgrownintoatoweringtree.Whatanunbelievablemiracleoflife! ThedaybeforetheSpringFestivalthe16atthewindowwascontinuingthemorefiercewindthe17soundasiftoremindmetolookupandappreciateitspowerfullife. ThatnightIsleptpeacefullyhavingan18.Inthedreamsomeflowerswerecomingout19.ThenextmorningIstoodagainstthewindow.20thewindowwasthetreeburstingwithlife.AnywayIhadawonderfulSpringFestivalthatyear. 1A.where B.which C.when D.that 2A.admirable B.terrible C.favorable D.slight 3A.duty B.joy C.cold D.failure 4A.treatment B.report C.exercise D.experiment 5A.while B.as C.when D.that 6A.window B.tree C.branch D.wall 7A.stoodup B.cameout C.gotout D.felldown 8A.decided B.pretended C.failed D.continued 9A.attachingto B.watchingover C.lookinginto D.pointingto 10A.confident B.proud C.worthy D.certain 11A.threw B.turned C.needed D.placed 12A.bend B.drop C.stand D.swing 13A.aware B.tired C.worthwhile D.proud 14A.tool B.stick C.pipe D.pump 15A.roots B.nuts C.flowers D.stems 16A.tapping B.striking C.attacking D.hitting 17A.more B.most C.better D.best 18A.idea B.walk C.rest D.dream 19A.politely B.shyly C.passively D.wildly 20A.On B.Outside C.Inside D.Besides
Theywereahappyfamilyfourdaughtersallinthesameschoolindifferentgrades.TheyoungestJanicewhowasinmyclassseemedtobeglued粘tohermother'sskirts.ThethreeoldergirlstookthebustoschooleverymorningbutJanicewasalwaysdriventoschoolbyhermother. OneFridayJanice'smotheraskedforatalkwithme.ShesaidinasoftvoiceMyhusbandisgoingtoEuropeonbusinessfortwoweeksandheinsiststhatIgowithhim.IhavetriedtoexplainoverandoverthatJaniceneedsmehere.ButhethinksthatshewillbefinewithoutmesoIhavenochoiceIhavetogo.Ihavetoldthebabysittertodrivehereverymorning.WillyoupleasegiveJanicespecialattentionandhelpher?Iwanttobesureeverythinggoeswellforher. ItoldherthatwewouldmakeeveryefforttosupportJanice.IevenvolunteeredtomeetJaniceathercarsoshewouldseeafamiliarface.AsamothermyselfI'dliketohelp.Janice'smotherthankedmeforourunderstanding. OnMondaymorningexpectingatearfulanxiouschildIplannedaspecialprogramoffunandgames.IwaitedoutsidetogreetJanicebutjustthenthebusarrivedandnotthreebutfourgirlsgotoff.Janiceskippedalongjoyfullysayinggoodbyetohersistersassheranwithtwofriendsintotheclassroom.IwalkedslowlyintotheclassroomandcalledJaniceovertoaskhowthebusridewent.ImpatientlyshesaidOhIalwayswanttotakethebuswiththeotherkidsbutMotherneedstobewithme.Youseetherewon'tbeanymorebabiessoIhavetobeababyalittlelonger.WhilesheisawayI'lljustridethebuseveryday.Iamfiveyouknow. 1WhydidJanice'smotherwanttohaveatalkwiththeauthor? A.ToaskhertohelpJanicewithherhomework. B.ToaskhertopickupJaniceeveryday. C.ToaskhertogiveJanicemoreattention. D.ToaskhertomeetJaniceathercar. 2WhatdidtheauthornotdoforJanice? A.Planaspecialprogramoffunandgames. B.Waitforheroutsidetheschool. C.Greetherwhenshegotoffthebus. D.Askaboutherbusride. 3WhatdidJanicelooklikeonMondaymorning? A.Shewastearfulandanxious. B.Shewasworriedabouthermother. C.Shemissedhermotherverymuch. D.Shewashappyratherthansad. 4Whatdoweknowfromthepassage? A.Janiceistooyoungtogotoschoolbybus. B.Janicelikestakingthebustoschool. C.Janicedoesn'tlikeherbabysitter. D.Janiceisnolongerachild.
三国时期著名的数学家刘徽对推导特殊数列的求和公式很感兴趣创造并发展了许多算法展现了聪明才智．他在九章算术“盈不足”章的第19题的注文中给出了一个特殊数列的求和公式．这个题的大意是一匹良马和一匹驽马由长安出发至齐地长安与齐地相距3000里1里＝500米良马第一天走193里以后每天比前一天多走13里．驽马第一天走97里以后每天比前一天少走半里．良马先到齐地后马上返回长安迎驽马问两匹马在第几天相遇
设复数则a+b＝
△ABC的内角ABC的对边分别为abc且acosB﹣bcosA+2c＝0则．
设n为正整数集合A＝{T|T＝t1t2…tntk∈{01}k＝12…n}．对于集合A中的任意元素X＝x1x2…xn和Y＝y1y2…yn记dXY＝． Ⅰ当n＝3时若X＝110Y＝011求dXX和dXY的值 Ⅱ当n＝4时设B是A的子集且满足对于B中的任意元素XY当XY相同时dXY是偶数当XY不同时dXY是奇数．求集合B中元素个数的最大值 Ⅲ给定不小于2的n设B是A的子集且满足对于B中的任意两个不同的元素XYdXY＝n．写出一个集合B使其元素个数最多并说明理由．
某几何体的三视图如图所示该几何体的体积是
1若a＞0b＞0求证≥ 2若α≠k∈Z且+≥﹣|x+m|﹣|x﹣1|+3对于x∈R恒成立求实数m的取值范围．
等差数列{an}的前n项和为Sn公差d≠0已知S4＝16a1a2a5成等比数列． 1求数列{an}的通项公式 2记点A3S3B4S4C5S5求△ABC的面积．
Riseandshineallday Makingtheseeasytaskspartofyourmorningschedulewillimproveyournutritionenergyandmoodtoday﹣andbeyond. Stretchinbed Trythisevenbeforeyouopenyoureyes.Liftonearmandbeginbystretchingeachfingerthenyourhandthenyourwristandthenyourwholearm.1.Thenstretchyourtoesfeetanklesandlegs.Finallyendwithaneckandbackstretchthatpushesyououtofbed.Thispowerposemakesyoufeelmoreconfidentalldaylong. 2Workingoutbeforeyoueatencouragesyourbodytoburnmorefatforenergyratherthanrelyingoncarbohydrates碳水化合物fromfood.Inastudyparticipantswhoexercisedafterbreakfaststillgainedweightbutthosewhoexercisedonanemptystomachdidnot. Turnonthemusic 3.Ifanyoneplaysaninstrumentandifyouhavealittletimemorningistheperfecttimetopracticeasitpreparesyourbrainforlearning.Onestudyfoundthatbothplayingandlisteningtomusichelpimproveacademicperformancein16differentwaysincludingincreasingfocusandmemory. Enjoysomefun Manypeoplefeartofaceanewdayofworkschoolorchores.4.Thiscanbehavingacupofcoffeeasyoureadyourfavoriteblogetc.Chooseactivitiesyouenjoyandthatsetyouonagoodpathfortheday You'veimprovedyourstateofmindyourhealthandyourproductivity﹣allbeforetheweekdayhasevenbegun. 5. A.Picksomethingenergeticthatyouandothersinthehouseenjoyandputitonwhileyougetready B.Nowyou'rereadytoconqueryourto﹣dolistfortodayandeveryday C.Doregularexerciseinthemorning D.Moveontotheotherarm E.Exerciseabit﹣Onanemptystomach F.Takeuptheentirelengthofthebedwhenyoustretch G.Butifthefirstthingyoudoispleasantyou'llfinditmucheasiertogetgoing
IntheWestsomepeoplebelievethatpersonalitycanbepredictedaccordingtothebloodtype1thepersonwasbornwith.PeoplewithbloodtypeAforexample2considermorelikelytobeserioushard﹣workingandquietwhilepeoplewithbloodtypeOarelikelytobepopularandoutgoingyetoftenunable3finishwhattheystart.Thoughthisbeliefcontinuestobestrongsomepeoplequestionwhetheritistrue. Theblood﹣typepersonalitytheory4startinJapanin1927whenFurukawaTakehinoticedpersonalitysimilaritiesand5differentamonghisworkers.Thisideasoonwentoutoffashion6itwasbroughtbackbyaJapanesetelevisionhostnamedToshitakaNomiinthe1970s.ThebeliefisstillstronginJapanandisincreasinglypopularinneighboringcountries.MostAsiansmightbelieve7theblood﹣typetheorybutformanyitseems8harmandnotsomethingtobetakentooseriously. Isthebelieftrue?ThescientistsinAsialargelydismiss摒弃thebeliefasamodern﹣daysuperstition迷信.Moststudieshavefailedtofindanystrong9connectbetweenbloodandpersonality.10generalscientistswarnagainstmakingpredictionsorimportantdecisionsbasedonthisquestionabletheory.
如图所示正方形ABCD的边长为2椭圆C1＝1a＞b＞0及双曲线C2＝1m＞0n＞0均以正方形顶点BD为焦点且经过线段AB的中点E则椭圆C1与双曲线C2离心率之比为．
AllAboardforaFamilyTripbyTrain Ifyou'relookingforafamilyvacationidealooknofurther.ExploreAmericawithAmtrak.Onthetrainyourfamilywillhaveplentyofroomtospreadoutandrelax. OnceonboardthefamilycantakeinthesceneryfromtheSightseerLounge观景车厢.PlusmostofourovernighttrainsfeatureDiningcarsthatservethreemealsadaywithfullmenusandtableservice.Ifyou'relookingforlighterfaregrababitetoeatoradrinkintheCafécar.YoucanalsoreserveSleepingcaraccommodationsandletthegentlerhythmsofthetrainswayyoutosleep.It'sthebestwaytoarriveatyourdestinationrestedandreadytogo. LearnMoreAbouttheOnboardExperienceonwww.amtrak.com •ADiningExperiencelikeNoOther Fromfullsit﹣downmealstomoreinformalfoodservicemanytrainshaveoneormoreoptionforonboarddining.Ifyou'renothungryyoumightstarttohearyourstomachrumbling腹鸣afterlookingatourmenus.Weprovideyouwithmorediningchoicesonboarddiningreservationsandthedifferenttypesofdiningcarslikelongdistancedinningcarloungecarandcafécar. •SleepingAccommodations Sleepingaccommodationsareavailableonmostlong﹣distanceroutes.Amtraktrainstravelingonlong﹣distanceroutestypicallyuseeithertwo﹣levelSuperlinerorone﹣levelViewlinertraincarequipmenteachofwhichincludebedroomsarrangedinvariousconfigurationsandprivateandpublicbathroomsandshowers. •SeatingAccommodations OnmostAmtraktrainsyouhavethreeoptionsforseatingaccommodations.Theavailabilityoftheseoptionsvariesdependingonyourrouteandthetypeoftrainequipmentinuse CoachClassDesignedforYoutoRelax. BusinessClassMoreAmenities.MoreComfort. FirstClassExclusivelyonAcelaExpress. 1Thefamilycansavealittlemoneybyeatingat. A.dinningcar B.viewliner C.cafécar D.superliner 2HowmanychoicesdoesAmtraktraincanofferinseatingaccommodations? A.Two. B.Three. C.Four. D.Five. 3Fromthepassagewecanknowthat. A.alltrainsprovidesleepingaccommodations B.noovernighttrainsfeatureDiningcarsatall C.tripbytrainistheonlywaytotravelrested D.manytrainshavemanyanoptionfordining
假设你是李华.你的外国笔友打算于7月来中国特来信了解中国人的社交习俗.请你用英语回一封信从以下几个方面作具体介绍 1.见面时的问候方式 2.接收礼物时的回应方式 3.餐宴礼节. 注意1.词数100左右信的开头和结束语已写好不计入总词数 2.可根据内容要点适当增加细节使行文连贯. DearJane Gladtohearfromyouandyou'rewelcometoChinainJuly. Yourssincerely LiHua
在极坐标系中若点A在圆Cρ＝1上则点A到直线lρcosθ+sinθ＝2距离的最大值为．
Withthepassingof2018andSpringFestivalwe1startanewimportantyearalready. Thisyearisoneofthefinalsteppingstonestobecominga2moderateprosperoussocietyin2020.Meanwhile2019marksthe70thanniversaryofthefoundingofthePeople'sRepublicofChina.Topreparefor2019thegovernmentmade3iteconomicagenda事项clearattheCentralEconomicWorkConference4attendbythecountry'sleadersinBeijinginDecember. Greatattentionwillkeepon5paytoChina'sgrowthperformancein2019.Tomeetthetargetofdoubling2010GDPbytheendof2020itneedstoaverageabout6.3percentthisyearandnext. MeanwhileChinawillhostthesecondBeltandRoadForumforInternationalCooperationinApril.AtthiseventtheBeltandRoadInitiative6hashugepotentialtodriveeconomicgrowthwilltakegreatershape. Thisyearisalsolikelytopavethewayforanumberoftechnological7advance.Chinaisexpectedtorollout5Gthenextgenerationof8wiretechnologynextyear.It'supto100timesfaster9thecurrent4Gtechnology. ItwillbeayearforChinatoreflect10itspastandfuturedirection
设函数则下列结论中正确的是
如图在四棱柱ABCD﹣A1B1C1D1中侧棱A1A⊥底面ABCDAB⊥ACAB＝1AC＝AA1＝2AD＝CD＝点E为线段AA1上的点且AE＝． Ⅰ求证BE⊥平面ACB1 Ⅱ求二面角D1﹣AC﹣B1的余弦值 Ⅲ判断棱A1B1上是否存在点F使得直线DF∥平面ACB1若存在求线段A1F的长若不存在说明理由．
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. I'mdelightedtoknowyoushowedagreatinterestinChinesetablemanners.NowIwouldliketoshareyouhowtobehaveproperlywhenweareinvitedtodinner. Tobeginwiththehostwillreserveaspecialseatfortheguestwhichishighlyhonoredonsuchanoccasionbutisexpectedtobethefirsttotastethefoodserved.BesidechopsticksandspoonsareusuallyusedwhenyouareeatinginChina.Thirdyouarenotsupposedtomakinganoisewhileeatingsoup.Lastbutnotleastremembertothankthehostforthedeliciousfoodhehasbeenofferedwhichwillsurelymakehimhappily. Ihopemyadviceswillbeofhelptoyou.
NotallofGeorgeH.W.Bush'sextendedfamilymemberswereinvitedtohisWashingtonD.C.memorialservice. NearlyaweekaftermanypaidtheirrespectsattheWashingtonNationalCathedralSharonBushwhowasmarriedtothe41stpresident'ssonNeilfrom1980to2003toldPageSixthatshewasallegedlyunabletoattendthefuneralaftershewastoldbyherex﹣husband'ssecretarythattherewerenotenoughseats. Iwasgoingtotakethetraindown.Iwantedtopaymyrespects.ButIpaidmyrespectsbyraisingthreewonderfulchildrenduringa23﹣yearmarriageSharontoldtheOutlet. NeilandSharonsharethreechildrensonPierceanddaughtersAshleyandLaurenBushLaurenwhogaveareadingatthefuneralwherethefatherofthreeattendedwithhissecondwifeMariaAndrewswhomhewedin2004. WhiletheD.C.memorialservicewastakingplaceSharonrecalledhavinglunchwithLadyGaga'smotherCynthiaGermanottaandpublishingheiressAnneHearst. ThoughshewassnubbedfromthefuneralSharonsharedphotosonInstagramtohonorherformerfather﹣in﹣law.MygirlsLaurenandAshleyreadscripturesattheirgrandfather'sfuneral.Ifeelsoproudofthem.MayheRIP.ThemotherofthreecaptionedaphotoofLaurenandAshley. MayheRIPSharonalsopostedonInstagramspeakingoftheirchildren'supbringing.Sharoncreditedherselfforraisingthemtobecharitableandpublicservants.Itaughtthemeverythingtheyknowabout‘pointsoflight'bytakingthemtosoupkitchensandhomelesssheltersfromthetimetheywere4yearsold.Ididn'twantthemspoiledshesaidreferencingthepublicservicenonprofit﹣PointsofLightforwhichherex﹣husbandservesaschairmanoftheboardofdirectors.Ididthis.Neilwasneveraround.HewasalwaystravelingSharonadded. 1WhywasSharonnotinvitedtoGeorgeH.W.Bush'sfuneral? A.Becauseshedidnotintendtoattend. B.BecauseshewasnotNeil'scurrentwife. C.Becausethecathedralcan'tholdsomanypeople. D.Becauseshewasbusywithherchildren'supbringing. 2HowdidSharonmournforthepassingawayofherformerfather﹣in﹣law? A.Throughmediainterviews. B.Bypostingonasocialmedium. C.Byraisingthreegrandchildren. D.Bylookingbackonlunchingwithhim. 3WhichofthefollowingisTRUEaccordingtothepassage? A.Sharon'smarriagelasted30years. B.NeilandSharonsharethreedaughters. C.PointsofLightisaprofit﹣makingcompany. D.Sharon'sgirlsattendedtheirgrandfather'sfuneral. 4WhatisSharon'sattitudetowardsNeil'sperformanceofbringingupchildren? A.Unconcerned. B.Appreciative. C.Dissatisfied. D.Positive.
已知曲线fx＝bex+x在x＝0处的切线方程为ax﹣y+1＝0． 1求ab的值 2当x2＞x1＞0时fx1﹣fx2＜x1﹣x2mx1+mx2+1恒成立求实数m的取值范围．
Whenyouaresittinginclasshaveyoueverdrawnpicturesinthemargins页边的空白处ofyournotebooks?Ifsoyouaredoodling.Manypeoplethinkofdoodlingasadistraction分心frommoreimportantthings.Butitmightbejusttheopposite. Onestudyshowsthatdoodlingmayhelpyourememberthingsyouhear29%more.Besidesdoodlingcanhelpyouthinkcreatively.Walkingawayfromaproblemtodrawmightactuallyhelpyousolveit.Whenyoucomebackyou'llhaveafreshperspectiveandfigureoutananswermorequickly. AnauthornamedSunniBrownwroteabookondoodling.Shearguesthatdoodlingisatoolthatcanhelppeoplethink.Infactsherunsabusinessthathelpscompaniesimproveorganizationandplanningthroughdoodling.Brownbelievesdoodlingishelpfulbecauseitincludesmanywaysoflearning.Youlearninfourwaysseeinghearingreadingorwritingandthroughmovement.Themorewaysyouusethebetteryoulearn.Andwhenyoudoodlewhilelisteningtoalectureyouuseallfour. Youmightthinkthatbeinggoodatdrawingisimportantfordoodling.Butifthepointofdoodlingistohelpyouthinkthenitdoesn'tmatterwhatthepicturelookslike.Evenifyou'renotanartistdoodlingcanhelpyou.Sonexttimeyouneedhelpfocusingpickupapenanddoodleaway! 1Thepassagemainlytellsustheofdoodling. A.advantages B.disadvantages C.effects D.problems 2WhatdoestheunderlinedwordperspectiveprobablymeaninParagraph2? A.体验 B.观点 C.困扰 D.机会 3HowdoesSunniBrownfeelaboutdoodling? A.Ithelpsrememberbetter. B.Ithelpsthinkcreatively. C.Itinvolvesfourwaysoflearning. D.Itneedsdrawingskills. 4Accordingtothetextitishelpfultodoodlewhen. A.youwanttofocusyourattention. B.youhaveaconversation. C.youwonderinthepark. D.youwatchamovie. 5Whereisthepassagepossiblytakenfrom? A.Abookreview. B.Amessageboard. C.Astudenttextbook. D.Asciencemagazine.
如图1△ABC中C＝90°AC＝2BC＝4EF分别是AC与AB的中点将△AEF沿EF折起连接AC与AB得到四棱锥A﹣BCEF如图2G为线段AB的中点． 1求证FG∥平面ACE 2当四棱锥A﹣BCEF体积最大时求F与平面ABC的距离．
Let'scatchaglimpseofthelatestinventionsthisyear. Parallelsletsyouusedesktopappsonyourphone You'dthinkmostapplicationswouldhavecreatedamobileappbynow﹣butmanycompaniesstillusedesktopappsexclusively.NowParallelsAccessletsyouaccessthemonyoursmartphone.AllyouneedtodoisdownloadtheappthenconnectParallels'Applification™toyourcomputersoyoucanaccessimportantfilesandotherappswithasingleclick.Youcaneasilyuseyourappsinfull﹣screenmodeusingintuitive直观的touchcontrolstoworkfasterthanbefore. UsuallyParallelsAccessis﹩19.99butyoucangetitnowfor﹩9.99. Takeyourlightingtothenextlevelwiththissmartswitch Youprobablydon'tspendalotoftimethinkingaboutyourhome'slightingbutit'simportantthewaythatyoucontrolyourlightingaffectstheenvironmentandyourelectricbill. ThisWiFiwallswitchiscontrolledviaacompanionapponyoursmartphonesoyoucancontrolconnectedlightsorceilingfansfromanywhere. UsuallytheMerossWiFiWallLightSwitchcosts﹩45.99butrightnowit'sonsalefor﹩39.99. Shootbeautifullyclearvideoswiththissmartphonegimbal Ifyou'reinterestedinshootingprofessional﹣qualityvideosandphotosyoudon'thavetospendafortunetotakeabeautifullycomposedshotjustusethisRigietSmartphoneGimbalinstead. Agimbalisasupportforyourcamerainthiscaseyoursmartphonethatallowsittopivot移动andautomaticallydetectandadjusttothepositionthatyouwanttofilmin.Unlikeanyothercamerahardwareyoumightownthisonecomeswithitsownaccompanyingapp. UsuallythisRigietSmartphoneGimbalis﹩269butyoucangetitnowfor﹩109.99. 1Whatdotheseproductshaveincommon? A.Theysaveusenergy. B.Theymakeusworkfasterthanbefore. C.Theymakeourlifeeasierandmorecomfortable. D.Wehavetodownloadtheirappsbeforetheyareused. 2Whichproductgivesyouthebestdiscount? A.TheRigietSmartphoneGimbal. B.TheMerossWiFiWallLightSwitch. C..TheParallelsAccess. D.TheDesktopApps. 3Inwhichsectioncanweseethearticleinanewspaper? A.Education. B.Science. C.Society. D.Culture.
设均为单位向量则“与夹角为”是“|+|＝”的
热门题库
更多
高三下学期数学
高三上学期数学
高一下学期英语
教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理
高三上学期生物
湘公网安备 43130202000226号