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假定你是李华,你和几个朋友打算去参观茶园,想邀请美国交流生Henry同往.请你给他写封邮件告知活动安排.内容包括： 1.时间和地点; 2.学习如何沏茶,品茶; 3.介绍中国茶文化的历史和发展....
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高三下学期英语《》真题及答案
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假定你是李华你的英国交换生朋友Mr.Trump回国前向你推荐了BritishMiddleSchool
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假定你是李华打算下周去美国参加美国文化之旅活动请给你的美国笔友Mike写一封电子邮件内容主要包括1.
假定你是李华你的美国朋友John本周日想邀请你去他的寄宿家庭参加朋友聚会但你无法参加请依据下列要点给
假设你叫李华你的一个朋友John刚从美国归来邀请你参加本周日在他家举办的朋友聚会但你不能参加请你根据
假定你是高中学生李华你的美国朋友Jim即将升入高中想让你给他一些学习建议请你给他写一封电子邮件内容包
假设你是新华中学的学生李华你的美国朋友Tom一周前给你发电子邮件询问你暑假里的打算但你因准备期末考试
假定你是李华你班的美国交换生Tom结束了在你校一年的学习即将回国你和同学打算于7月10日下午在班上为
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第四节书面表达满分30分假如你是李华在你班学习的英国交换生Jane和你是好朋友两周前她去上海治病你现
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假定你是高中学生李华你的美国朋友Jim即将升入高中想让你给他一些学习建议请你给他写一封电子邮件内容包
李华同学很想暑假去北京以实现如下几个心愿你觉得他不能实现的是
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IhavebeenlearningEnglishforthelastfiveyearsandoneofthethings1hashelpedmetoimproveisreading.Ilovereadingandoftenreadduringmyfreetime.FirstI2startreadingeasythingsinEnglishlikerecipes食谱forcookingandshortstories3writeespeciallyforlanguagelearners.ThenImovedontolongerstoriesandnewspaperarticles.4firstIfoundthatreadingwasdifficultbecauseofthevarietyofvocabularyandthegrammar5thissoonbecameeasierandIfoundthatIcouldunderstandmoreandmoreof6Iwasreading.Ididn'tworryifIdidn'tknowallthewordsasIcouldstillunderstandthemainideas.ReadinghashelpedimprovemyEnglishinmanyways.I'mnotonly7betterandquickerreaderbutalsomy8spellwritinggrammarandvocabularyareallmuchbetter.IthinkIhaveimprovedfaster9someofmyfriendswhohavebeenlearningatthesametimeasme.SoIwouldsaythateveryonewhowantstolearnalanguage10quickshouldread.
阅读下面短文根据其内容写一篇60词左右的内容概要. Whatiseco﹣fashion?Eco﹣fashionisaboutmakingclothesthatconsiderstheenvironmentthehealthofconsumersandtheworkingconditionsofpeopleinthefashionindustry. Acloserlookatthefashionindustrypointsoutmanyproblemsthatarecommonpracticesinthecreationofourfashionsfromthefieldtothefactory.Firstlytheproductionoftextilespollutestheenvironmentheavily.Cotton﹣plantingusespesticidessheep﹣farmingandwool﹣cleaningbringaboutglobalwarming.Secondlyeverystageofclothingproductionconsumesagreatdealofenergyandsomealsoinvolvechemicalswhichobviouslydoharmtothesurroundings.Inadditionthereisalotofwasteproducedintheprocessespeciallyintheformofpollutedwater.Thirdlygrowingpurchasingpowerandourshoppinghabitsfurtherworsenthebadeffects.Wearenowbuyingclothesinincreasingquantitiesandwearealsoquicktothrowawayclothesthathavebeenwornonlyacoupleoftimes. Thenhowtosolvetheproblem?Toalargedegreeitisthefashionproducersthatreallyhavethepowerandtheresponsibilitytoshapeourfuture.Thereareagreatmanywaystheseproducerscanreducetheirecologicalfootprintfromswitchingtogreenenergyandreducingenergyusethroughselectingsustainablematerialsandchoosinglocalsupplierstorecyclingandminimizingwaste.Ontheotherhandasconsumerswecanallplayourpartbyselectingenvironmentallyfriendlyclothingandreducingclothingbuying. Thereissomeconcernthateco﹣friendlyfashionsarejustatrendthatwewilleventuallygrowtiredofbutwecanmakesurethatdoesn'thappen.Nowmanypeoplearebeginningtoshopfororganicfoodproductsbecausethebenefitsofeatingfoodfreeofchemicalsareimmediate.Theyrelatedirectlytoourpersonalhealth.Infactchoosingeco﹣fashioncanalsodogoodtoourpersonalhealththoughitismostlydonebywayofkeepingthehealthoftheplanet.
已知函数与gx＝2elnx+mx的图象有4个不同的交点则实数m的取值范围是
某工厂的某种产品成箱包装每箱200件每一箱产品在交付用户之前要对产品作检验如检验出不合格品则更换为合格品．检验时先从这箱产品中任取20件作检验再根据检验结果决定是否对余下的所有产品作检验．设每件产品为不合格品的概率都为p0＜p＜1且各件产品是否为不合格品相互独立． 1记20件产品中恰有2件不合格品的概率为fp求fp的最大值点p0． 2现对一箱产品检验了20件结果恰有2件不合格品以1中确定的p0作为p的值．已知每件产品的检验费用为2元若有不合格品进入用户手中则工厂要对每件不合格品支付25元的赔偿费用． i若不对该箱余下的产品作检验这一箱产品的检验费用与赔偿费用的和记为X求EX ⅱ以检验费用与赔偿费用和的期望值为决策依据是否该对这箱余下的所有产品作检验
对于函数有下列4个结论 ①任x1x2∈[0+∞都有|fx1﹣fx2|≤2恒成立 ②fx＝2kfx+2kk∈N*对于一切x∈[0+∞恒成立 ③函数y＝fx﹣lnx﹣1有3个零点 ④对任意x＞0不等式恒成立则实数是的取值范围是． 则其中所有正确结论的序号是．
OdysseusisaliteraryfigureintheOdysseywrittenbyHomer.He1rejectthecomfortablelifeofaGreekkingandmadeapromisetohelpanotherGreekleaderMenelaus.Butthewardraggedonandonandhewasaway2hisfamilyfortenyears.Duringthistimethefortunesofthewarweresochangeablethatnoonecouldpredict3wouldwin. OdysseusbecametiredofthewarandthedelayinTroy.He4urgentwantedtoreturnhomesowhentheGreekkingshadtheirregular5weekmeetinghesuggestedthattheytakeanopportunity6tricktheTrojans. TheGreeksbuiltagiantwoodenhorsesothatmencouldhideinsideit.TheGreeksthenpretendedtoleaveaboardtheir7shipasiftheywerediscouragedbythe8longofthewar.TheTrojansblessedtheirGodfortheirgoodfortuneandpreparedtocelebrate.ThatnightthemenclimbedoutofthehorseandopenedthecitygatestotheGreekarmy.TheTrojansheardthesoundofthewarningbell9announceaGreekvictory.Thewarended10thepunishmentoftheTrojanpeoplewasonlyjustbeginning.
SanFranciscoknownasTheCitybytheBaypacksalotoffun. ViewofGoldenGateBridgefromBakerBeach AsoneofthemostfamoussightsinallofSanFranciscotheGoldenGateBridgeisanabsolutemust﹣see…ThereareafewgoodspotstoviewitfrombutmypersonalfavoriteisBakerBeach.Thisisalsoaparticularlygoodspottobuyamealfromalocalmarketlaydownablanketandenjoyapicnicintheviewofthefamousbridge. VisittheMuseeMecanique Fisherman'sWharf码头isoneofthemosttouristyareasofSanFranciscoandtheoverpricedcrowdedsightscanbetiring.ButonWharf41there'sauniqueattractiontheMuseeMechanique.Thismuseumhasoneofthelargestcollectionsofoldindoorsgamemachinesintheworldwhichoffersgraetamusements.Entryisfreeandit'sonlyacoupleofquarterstoplaythegames. EatatSparkSocialFoodTrucks Withsuchavariouspopulationitcanbedifficulttodecidewhatcuisinetoenjoyfordinner.LuckilyatSparkSocialFoodTrucksintheMissionBayyoucantryalittlebitofeverything!Notonlyisthefooddeliciousbutthefoodtruckhasacommunityfeelwithweeklyeventsandfreedesserts. HaveTeaattheJapaneseTeaGarden IfyoudesireforsomecalmonthesomewhatnoisystreetsofSanFranciscotheJapaneseTeaGardenisperfect.LocatedinGoldenGateParkthegardenlooksexactlylikeJapan.Andyoucanenjoyteainthetraditionalteahouseoverlookingalake. 1WhatdoestheMuseeMechaniqueoffer? A.Amusements. B.Picnicspot. C.Peace. D.Deliciousfoods. 2Whichspottreatstouriststofreedesserts? A.Wharf41. B.TheMissionBay. C.TheBakerBeach. D.GoldenGateBridge. 3WhatcanweinferabouttheJapaneseTeaGarden? A.ItsteaisfromJapan. B.Itisthebestteahouse. C.Itisaquietplace. D.ItwasbuiltbyJapanese.
Itisnowpossibletowatchlivesportontelevisiononanydayoftheweekandthepresentamountofreportingwillundoubtedlyincreasefurtherinyearstocome.Thisiscertainlyhavinganinfluenceonthelivesportseventsthemselvesandtherearebothbenefitsandshortcomingstothis. 1ForonethingwithdigitalbroadcastingtherearenowmanymoreTVchannelsthantherewereeventenyearsago.Moreoversporthasbecomeanimportantformofentertainmentattractingbothmenandwomen. Whatarethebenefitsofthistelevisedsport?2Largefootballclubsbenefitfinancially财政上fromTVincomeandthetopplayerscanbewellpaid.Lesspopularsportsalsoreceivemoneythatcanbeusedintrainingandadvertising.What'smorethereisahealthbenefittosomeofthepopulation.3. Howevertherewillbesomedisadvantagesifsomuchsportisontelevision.Consideringfootballagainmanysmallclubshavesufferedfinanciallossesrecentlyastheycannotcompetewiththelargeones.4Fewerpeoplewatchlivematchesnowadayspreferringtowatchfromthecomfortoftheirlivingroom.Andticketpriceshaverisengreatly. Inawordwatchinglivesportontelevisionhasbothgoodandbadeffects.Televisedsporthascreatedmanychancesandbenefitedcertainpeopleandclubsverymuch.5. A.Whyhastherebeensuchgrowthintelevisedsport? B.Whyaretheresomanybenefitsofwatchinglivesportontelevision? C.Televisedsportcanbehelpfulinincreasingpeople'svalueofteamwork. D.Therehasbeenageneralfallinginticketsalesespeciallyamongsmallerclubs. E.Throughtelevisedsportmorepeoplehavebecomeinterestedinactuallyplayingsport. F.Oneobviousadvantageoftelevisedsportisthemoneyprovidedbytelevisioncompanies. G.Howeverithasalsobeenresponsibleforchangingthenatureoflivesportseventsforever.
It'snothingunusualforpeopletomultitasknowadays.Buttheabilitytodoanumberofthingsatthesametimecouldbedifferentbetweenthetwosexes. AteamofUKresearchersrecentlycomparedtheperformancesof120womenand120meninacomputertestaboutswitching转换betweentasksofcountingandshaperecognition. Menequalledwomenwhentasksweredoneoneatatime.Butwhenthetasksweremixeduptherewasacleardifference.AccordingtothepaperpublishedinthejournalBMCPsychologybothwomenandmensloweddownandmademoremistakesastheswitchingbecamemorerapid.Butmenwereslowertaking77percentlongertoanswerwhilewomentook69percentlonger. Tomaketheexperimentmoreconnectedtoday﹣to﹣dayliferesearcherstriedasecondtest.Agroupofwomenandmenweregiveneightminutestocompleteaseriesofeverydaytaskssuchasfindingrestaurantsonamapdoingsimplemathproblemsansweringaphonecallordecidinghowtheywouldsearchforalostkeyinafield. Onceagainwomenperformedbetterthanmeninthetestespeciallyinthekey﹣searchingtask. Wheredowomengettheabilitytokeeporganizedunderpressurebetterthanmen?Researchersbelievethatithasitsoriginsinevolution进化.Inancienttimeswomenhadtokeepaneyeonchildrenwhilecookingmeals.Meanwhilemenonlyneededtofocusonhunting. Howeveraswithallstudiestheresultsdon'tnecessarilyapplytoeverysinglepersonintheworld.Wedon'tmeanthatmencan'tmultitaskorthatonlywomencanresearcherKeithLawsoftheUniversityofHertfordshireUKtoldBBCNews.Wearesayingthattheaveragewomanisbetterabletoorganizehertimeandswitchbetweentasksthantheaverageman. 1Inthetestsresearchersfoundthat. A.womenwerebetteratswitchingbetweentasksthanmen B.womenmademoremistakesthanmenwhenmultitasking C.menwerebetteratcountingandshaperecognitionthanwomen D.mencompletedaseriesofdailytasksmorequicklythanwomen 2Whatisthemainpurposeofparagraph6? A.Togiveadviceonhowtoimprovetheabilitytomultitask. B.Toshowhowmenandwomenthinkandrespondotherwise. C.Tocomparetherolesofmenandwomeninhumancommunities. D.Toexplainwhymenandwomenperformdifferentlyinmultitasking. 3WhichofthefollowingwouldKeithLawsmostprobablyagreewith? A.Allwomenareborntobegoodatmultitasking. B.Somemenareasgoodatmultitaskingaswomen. C.Menshouldn'tdojobsthatcallformultitaskingskills. D.Everywomanisbetterabletomultitaskthaneveryman.
假定你是李华.你通过用英语写信的方式和在北京留学的James建立了深厚的友情.请你用英语给他写封信谈谈写信给你带来的好处内容包括 1.交际方面 2.英语学习方面 3.思想认识方面. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
已知曲线C的极坐标方程是ρ2＝4ρcosθ+6ρsinθ﹣12以极点为原点极轴为x轴的正半轴建立平面直角坐标系直线l的参数方程为t为参数． I写出直线l的一般方程与曲线C的直角坐标方程并判断它们的位置关系 II将曲线C向左平移2个单位长度向上平移3个单位长度得到曲线D设曲线D经过伸缩变换得到曲线E设曲线E上任一点为Mxy求的取值范围．
已知等比数列{an}的前n项和为成等差数列且． 1求数列{an}的通项公式 2若bn＝﹣n+2log2|an|求数列的前n项和Tn．
已知函数fx＝|alnx﹣1|﹣|alnx+1|a∈R． 1当a＝1时求不等式fx≥1的解集 2若任意x∈[ee2]使得|fx|＝2恒成立求实数a的取值范围．
中国古代数学著作算法统宗中有这样一个问题“三百七十八里关初行健步不为难次日脚痛减一半六朝才得到其关要见次日行里数请公仔细算相还．”其大意为“有一个人走了378里路第一天健步行走从第二天起因脚痛每天走的路程为前一天的一半走了6天后到达目的地．”问此人第4天和第5天共走了
Itseemsthatartificial1intelligentcandomuchmorethanwhatwehaveeverimagined.Fromcontrollingthelightinginourhomesto2helpusorderpizzaAIhasbecomeanimportantpartofoureverydaylife.Butwhataboutthemorecreativeworksofmankind?Artmusicpoetry﹣theseareinspirednotbylogicorreason3byemotion. In2017researchersinSwitzerlandcreatedthedeepartificialcomposerDAC4cancreateoriginalmusicallby5it.Thescientiststrainedittolistentoover2000differentfolksongsand6baseonthisinputtheAItaughtitselfhowtogetthepitch音高andtimingandchoosetherightnotes.BesidesmusicAIalready7entertheworldofpoetryaswell.In2018ChineseandJapaneseresearcherswroteanAIprogramthatusesimagestowritepoems.Thenthepoemsweresentto500humanjudgeswhowereaskedtotell8theywerewrittenbyahumanoracomputer.Theresultshowedthatas9as200judgesmistakenlythoughttheywerewrittenbyahuman. Soifyouwere10artistoramusicianwouldyouwatchout?
过点M12的直线l与圆Cx﹣32+y﹣42＝25交于AB两点C为圆心当∠ACB最小时直线l的方程是．
如图在圆心角为直角的扇形OAB区域中MN分别为OAOB的中点在MN两点处各有一个通信基站其信号的覆盖范围分别为以OAOB为直径的圆在扇形OAB内随机取一点则此点无信号的概率是
已知函数fx＝lnx﹣ax+aba＞0b∈R． 1若存在正数a使fx≤0恒成立求实数b的最大值 2设a＝1若gx＝xex﹣2x﹣fx没有零点求实数b的取值范围．
WaystoFightandOvercomeLaziness Youreadproductivitytipsyou'veusedamillionto﹣dolistappsandyoupromiseyourselfeverymonththatyou'regoingtostartbeingproductivebutitneverhappens.Here'showtobreakthecyclewhenyoufeellikeyourproblemisjustlaziness. SimplethingsfirstIt'simportanttogetstartedwiththetaskyou'rewillingtoperforminordertofightlaziness.1Doingsowillhelpyoutobreakyourinnerresistance. Step﹣by﹣step2Anditwillkeepusmotivatedtoperformthesetasksoneaftertheotherinarelaxedmanner.Onceyouhavecompletedonesub﹣taskyoucantellyourselfthatyou'reonarollandthatyouwillsoonhavefinishedthenextsub﹣tasksaswell. RemovedistractionsWhateveritisthatdistractsyouTVtheInternetetc.removeit!3Makesurethatonceyouhavestartedwithoneofyourtasksyouwillnotgetdistractedfromitbyanymeans. RewardyourselfEverytimeyoumanagetoovercomelazinessandsuccessfullycompleteataskyoushouldrewardyourselfasthiswillgiveyoupositivefeelingaboutmakingeffortstogetthingsdone.4Littlerewardforsmalleffortsandviceversa反之亦然. Don'tgiveupIt'sonethingtofindyourmotivation.5Ratherthanlettingdifficultiesdemotivateyouseethemforwhattheyareandrefusetobebeatenbythem.You'renotaloneandstayingfocusedonworkingthroughchallengesisoneofthebestwaystofightthem. A.Turnoffdistractionsandfocusonyourgoals. B.Justmakesuretoadapttherewardtotheeffortsyoumade. C.Alistofweeklygoalswillhelpyoustayfocusedandmotivated. D.Amethodthathelpsyoudosoistostartwiththesimplethingsfirst. E.Occasionalrewardswillsweetenthetasksandhelpkeepyouontrack. F.Butit'squitesomethingelsetokeepitgoingwhenrunningintodifficultproblems. G.Breakingdowntasksintosmallertaskshelpsustoreducethepressureofdeadlines.
JapanesetechnologygiantToshibahasbuiltahugecleanfactoryfarmwhereitisgrowingvarioustypesoflettuce莴苣leaveswithoutsunlightorsoilforsaleinitsnewhealthcarebusiness. Locatedinadisused21000﹣square﹣footelectronicsfactoryinYokosukaToshibaannouncestohavecreatedaperfectbacteria﹣freeenvironmentwhereitwillgrowthreemillionbagsoflettuceayear. CompletelycutofffromconditionsoutsidethetemperaturecontrolledtanklettuceinspectorswearfullbodysuitswhilemakingnotesonthequalityandgrowthoftheleavesontheiriPadsinordertopreventtheairaroundtheplantsbecomingcontaminated. Eachplantisgivenman﹣madelightingtotrickitintobelievingitisexposedtosunlightwhilevitaminandnutrientsareputdirectlyintoitsrootsmeaningthelettucedoesnotneedsoil. Toshiba'snewhigh﹣techfarmmayproducetheworld'shighestqualitylettuce.Thefinalproductwillbefreeofanyformofbacteriaorinsectlifebeforebeingplacedintosealed密封的bagswhichshouldensuretheproducthasalongershelflifethanotherlettuces. Thegardeningtechniqueaimstohaveabacteriaamountofnomorethan1/1000th﹣muchlowerthanthatfoundinnormalgardeningsoil. Toshibaaimstoharvestthreemillionbagsofleaflettucebabyleafgreenscabbagesandotherkindsofvegetableseveryyear﹣witheachbaglikelytocostpeople£1. Themostimportantthinginorganicvegetablesthelettucerequiresnopesticides杀虫剂butisexpectedtohaveasimilarshelftoplantsthathavebeenheavilytreatedwithchemicals. ThelettucefactoryisnomarketingtrickbyToshibahowever.Insteaditrepresentsthecompany'slatestattempttoexpanditstechnology﹣ledbusiness. Therearealreadyplansforthetechnologygianttobuildsimilarfactoriesaroundtheworldoverthecomingyearsanditwillalsobesellingthehightechequipmentthatallowsfactoriestoproducesimilarproductsofexceptionallyhighquality. 1WhatisthepurposeofToshibainplantingthenewtypeoflettuce? A.Todoscientificresearch. B.Toincreasetheproduction. C.Toimprovethehealthcare. D.Tomakeaprofit. 2Theunderlinedwordcontaminatedinparagraph3canbereplacedby. A.polluted B.reduced C.controlled D.dried 3WecanlearnfromthetextthatthelettuceinToshiba'sfactoryfarm. A.needssoiltogrow B.hastobeexposedtosunlight C.canbestoredlongerthanthenormal D.gainsvitaminsandnutrientsfromman﹣madelighting 4Whatisthetextmainlyabout? A.ThebriefintroductionofToshiba. B.Theprocessofplantinglettuce. C.Thedevelopmentofafactoryfarm. D.Thenewwayofplantinglettuce.
已知函数fx定义域为R满足fx+4＝fx当﹣2＜x≤2时则ff﹣5＝．
ScientistsattheUniversityofBonncarriedoutextensiveresearchtoshowthatthewaterdropsrollingoffalotus莲花leafcarryawaydirtleavingthesurfaceperfectlyclean.ThisphenomenahasbeennamedtheLotusEffectandworksbestonroughsurfaces. Contrarytopopularbelieflotusleavesarenotsmoothatall.Whenexaminedunderapowerfulmicroscopetheleafcellsshowabumpysurface.Thatmakesthesurfacerough.Asaresultdirtrestsonlyonthetipsofthewaxcrystals蜡晶体coveringtheleafsurface.Theroughnessreducesthecontactareabetweenthedirtandtheleafsurface.Aroughsurfacestructurewithwaxcrystalsmakesitimpossibleforwatertostick.Duetothefriction摩擦力thewatercontractsatonce.Itformsroundwaterdropstominimizethecontactareawiththeroughwaxyleafsurfaceandrunsofftheleafveryquickly.Sincethedirtonlyrestsonthetipsofthewaxcrystalstheystickmorestronglytothewaterdropsthantotheleafsurfaces.Theyarewashedawaywhenthewaterfallsontheleaves. Onsmoothleavesthedirtispushedfromonepartoftheleaftotheother.Thisisbecausethedirthasalargercontactareawheretheycanrestcomfortablyontheflatsurface.Wemustalsokeepinmindthatwaterusuallyspreadsandonlypartiallyrunsofftheleaves﹣thattooonlyiftheleafistilted!Thedirtmaygetdrivenbuttheyaremainlydisplacedfromonesideoftheleaftotheother. ScientistssaythattheLotusEffectisparticularlybeneficialforithelpstoprotectthelotusleavesfromharmfulbacteria.Thedirtontheleavesoftencontainstinydiseasecausingfungiandbacteria.Whilemostofthebacteriagetwashedoffthefewthatremaineventuallydiesincetheydonotgetthewatertheyrequireforsurvivalandgrowth. 1WhatisLotusEffect? A.Theself﹣cleaningfeatureoflotusleaves. B.Thelotussurfaces'abilitytokillharmfulbacteria. C.Thedirtleavingofflotusleaveswiththehelpofwind. D.Lotusleavesmakingwaterdropsfromthedirtonthem. 2Whatdoestheunderlinedwordbumpyinparagraph2probobalymean? A.Flat. B.Bended. C.Flexible. D.Rough. 3Whyarewaterdropsunabletostayonlotusleaves? A.Thecontactareabetweendropsandleavesistoolarge. B.Thesmoothleafsurfacemakeswaterdropsrolldown. C.Theroughandwaxyleafsurfacereducesthefriction. D.Thewaterdropsfallontheleavesatatoohighspeed. 4WhatisthebenefitofLotusEffect? A.Itcanprotectthelotusfromsunshine. B.Itcanhelpthelotusgrowhealthily. C.Itcanmakethebacteriamoreandstronger. D.Itcanhelpthelotusleaveskeeptherequiredwater.
显然你应当为自己的行为向老师道歉.obviousapologize
如图一简单几何体ABCDE的一个面ABC内接于圆OGH分别是AEBC的中点AB是圆O的直径四边形DCBE为平行四边形且DC⊥平面ABC． Ⅰ证明GH∥平面ACD Ⅱ若AC＝BC＝BE＝2求二面角O﹣CE﹣B的余弦值．
某几何体的三视图如图则该几何体的体积是
FourEverydayThingsHurtingYourHealth Youreverydaybehaviorsmaybeholdingyouback.Howeverperhapsyoudon'tevenknowit.1aswellassomeexpertadviceonwhattodoinstead. 2.Itcanalsodecreaseyourbrain'sabilitytofunctionthusresultinginpoorperformanceatworkandlongerreactiontimebehindthewheel.Expertsrecommendpracticingarelaxingbedtimeroutineliketakingabathcuttingdownoncaffeineandalcohol.Anothertrickistosticktoaconsistentsleepschedule. Studieshaveshownthatsittingforextendedperiodscanhavesignificantnegativeimpactsonphysicalandmentalhealth.Youdonthavetorunamarathontogetactivethough.WorksmallexercisesintoyourdaylikestandingduringTVadvertisementsorparkingyourcarfarawayfromanentrance.3. Isituneasytolockyourcellphoneawayforasolid60minutes?Socialmediaisn'thelpingeither.Expertsrecommenddeletingsocialmediaappsorhidingthem.4andmakingapointofdoingsomethingtogroundyouinthepresentmomenteachday. Intoday'scompetitivesocietyit'shumannaturetotakeonasmanytasksaspossible.Butcontinuousresponsibilityandrushingfromonejobtothenextisabadhabitthatcanleadtoeventualburnout.5especiallythosethatyouhavenotimetoaccept. A.Thesmallcanmakeahugedifference B.Badsleepcanleadtoavarietyofharms C.Goodeducationbackgroundisn'thelping D.Thismeanspracticingtheartofsayingyes E.Expertssuggestpolitelyturningdowninvitations F.Beawareofsomehabitswithanegativeimpactonyourhealth G.Theyalsosuggestchargingyourphoneoutsideofyourbedroom
已知集合M＝{x|2x﹣x2＞0}N＝{﹣2﹣1012}则等于M∩N＝
已知椭圆的左右焦点分别为F1F2离心率为P是椭圆C上的一个动点且△PF1F2面积的最大值为． Ⅰ求椭圆C的方程 Ⅱ设斜率存在的直线PF2与椭圆C的另一个交点为Q是否存在点T0t使得|TP|＝|TQ|若存在求出t的取值范围若不存在请说明理由．
某高中学校三个年级共有团干部56名采用分层抽样的方法从中抽取7人进行睡眠时间调查．其中从高一年级抽取了3人则高一年级团干部的人数为．
已知实数xy满足若z＝x﹣12+y2则z的最小值为
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