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在直角坐标系xOy中，直线C1：x＝﹣2，圆C2：（x﹣1）2+（y﹣2）2＝1．以原点O为极点，x轴的正半轴为极轴建立极坐标系． （1）求C1的极坐标方程 （2）若直线C3的极坐标方程为θ＝（...
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高二下学期数学《》真题及答案
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在平面直角坐标系xOy中直线x+2y-3=0被圆x-22+y+12=4截得的弦长为.
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
在平面直角坐标系xOy中直线x＋2y－3＝0被圆x－22＋y＋12＝4截得的弦长为________.
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
在平面直角坐标系xOy中直线l的参数方程为k为参数以原点O.为极点以x轴正半轴为极轴与直角坐标系xO
在平面直角坐标系xOy中已知圆C.:x2+y2-6-2mx-4my+5m2-6m=0直线l经过点10
在平面直角坐标系xOy中曲线y＝x2－6x＋1与坐标轴的交点都在圆C.上求圆C.的方程.
在直角坐标系xOy中以坐标原点O.为圆心的圆与直线x－y＝4相切.1求圆O.的方程2若圆O.上有两点
已知在平面直角坐标系xOy中圆C.的方程为x2＋y2＝－2y＋3直线l经过点10且与直线x－y＋1＝
，
两点，则△OAB的面积为( ) A.1 B.
2
2
选修4-4坐标系与参数方程 在直角坐标系xOy中曲线C1的参数方程为以坐标原点为极点以x轴的正半轴
在平面直角坐标系xOy中已知圆x2＋y2＝4上有且仅有四个点到直线12x－5y＋c＝0的距离为1则实
在直角坐标系xoy中圆的参数方程为θ为参数直线C1的参数方程为t为参数.1若直线C1与O.圆相交于A
在直角坐标系xOy中直线l的参数方程为t为参数在极坐标系与直角坐标系xOy取相同的长度单位且以原点O
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α为参数以坐标原点为极点x轴正
在直角坐标系xOy中直线l的参数方程为t为参数在极坐标系与直角坐标系xOy取相同的长度单位且以原点O
在平面直角坐标系xOy中已知圆x2+y2=4上有且仅有四个点到直线12x-5y+c=0的距离为1则实
在平面直角坐标系xOy中已知圆x2＋y2＝4上有且只有四个点到直线12x－5y＋c＝0的距离为1则实
在直角坐标系xOy中圆C.的方程为x﹣12+y﹣12=2在以坐标原点O.为极点x轴正半轴为极轴的极坐
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
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Imaginespending1182hoursworkinghardandreceivingnoencouragingwords.ThiswasthesituationIfoundmyselfinasI1anewswimteamwithaRussiancoach.Asalong﹣timeswimmerIwasusedtoreceivingplentifulpraisesand2speechesfrommycoaches.3afterpracticingforafewweeksInoticedIdidnothearany4likeyou'realmosttherecongratulationsoryou'redoinggreatthat5methroughthosehardpractice.Ireceivedscoffs嘲笑whenIwasexpecting6andpraises.TomeVladimirseemedlikea7man. AsIwastryingtounderstandhimthroughhisheavyaccentIrealizedthatVladimirhadbeentrainedand8bythecultureinRussiaandthatledtohisdifferentcoachingstyleandunusuallyhigh9.Hespentover1182hours10receivingnopraisesandwassimplyexpectedto11.Thismethodofcoachingthatseemedsoforeigntomewasfromwhathe12leavinghomeattheageoftwelveandeventuallywinninganOlympicmedal. Ibegantoappreciatehis13togiveoutpraises.Hehadamuchdifferentideaonhowbesttocoachandmotivateswimmers.Hedidnotfeelthe14tosaycomplimentssincehebelievedoneshouldbe15withoutthesepraises. Itwasthefactthathewassodifferentfrommypreviouscoachesthatmadehim16.HeforcedmetoreallythinkaboutwhyIwasswimming.Ilearnedtoswimnotfor17buttofindthemotivation.Itbecamecleartomethatthe18ofexperiencingvariouscoachingstylesisthateachonecanbringoutthebestinmeifIlearnfromthese19.Varioustrainingstylesmaybe20tomeatthestartbutcanhelpmegrowinmanyways. 1A.founded B.joined C.interviewed D.trained 2A.typical B.practical C.positive D.polite 3A.Therefore B.Otherwise C.Moreover D.However 4A.whistles B.words C.jokes D.news 5A.helped B.followed C.forced D.checked 6A.promises B.instructions C.smiles D.surprises 7A.funny B.cold C.poor D.brave 8A.replaced B.judged C.frightened D.influenced 9A.profits B.evaluations C.expectations D.scores 10A.thinking B.dreaming C.seeking D.swimming 11A.perform B.fail C.listen D.remember 12A.wentthrough B.gaveup C.carriedout D.keepon 13A.proposal B.removal C.refusal D.approval 14A.possibility B.need C.duty D.right 15A.advised B.ignored C.accepted D.encouraged 16A.valuable B.effective C.reasonable D.creative 17A.fame B.prize C.praise D.power 18A.pleasure B.risk C.chance D.benefit 19A.differences B.lessons C.mistakes D.stories 20A.similar B.uncomfortable C.important D.impossible
8分Thriftstoresarearefuge避难所forcountlessitemsfromlandingingarbagepiles.ValueVillageforexamplesavesmorethan650millionpoundsofclothingfromlandfills垃圾填埋场eachyearmakingitoneofthelargestrecyclersofusedgarmentsintheworld.Theirstoresgiveasecondlifeto1.8millionpoundsofclotheseverydaywhichisequalto600mid﹣sizedcars.Almost100percentofclothingandtextiles纺织品arerecyclableyet85percentofitendsupinlandfills.It'sestimatedthattheaveragepersonthrowsaway70poundsofclothingayear. LindsayCoulteristheso﹣calledQueenofGreenwiththeDavidSuzukiFoundationeducatingpeopleonhowtoliveagreenerlifebymakingchangesaroundthehouse.ShesaysthatdonatingandshoppingatthriftstoresisanexcellentwaytoexerciseallthreeofthethreeRsreducereuseandrecycle.ShesaysWhetherit'sapurseorapairofshoesit'sreallyworthconsideringgoingtothriftstoresasanotherpointofcontacttohelpreduceyourconsumption.Coulterpointsoutthatsincelandfillsareair﹣tighttextilestakelongertobreakdown.I'dimaginethingslikeanoldtowelaragoranoldT﹣shirtwilllastareallylongtimeshesays.Thebeautyofthriftshoppingisthatthesupplyisnever﹣endingsoifyoudon'tfindwhatyou'relookingforonedayit'slikelytoshowupinnotime. OnepersonwhoknowsthisquitewellisJodiJacykcostumespecialistintheDepartmentofTheatreandFilmattheUniversityofBritishColumbia.Shesaysthemajorityofitemsfortheuniversity'sproductionsarepurchasedsecond﹣hand.BecauseofhershrinkingbudgetitemslikeclothingandshoesarethriftedfromValueVillage.Weareconstantlythriftingandwere﹣usecostumesformanyyears.Thriftshoppingisamucheasiercheaperwaytodothings.shesays. Thenexttimeyouneedtolightenyourclosettaketheopportunitytogothriftshoppingtolightenbothyourcarbonfootprintandyourfinancialburdenatthesametime. 1Whatisathriftstoreaccordingtothetext? A.Itdealswithdailygarbage. B.Itsellssecond﹣handitems. C.Itexchangesnewclothes. D.Itdonatesuseditems. 2WhydidLindsayCoulteradviseshoppingatthriftstores? A.Tobefriendlytoenvironment. B.Tomakeachangeoflifestyle. C.Toreducethecostofthefamily. D.TocollectmoneyfortheFoundation. 3WhatdoweknowaboutJodiJacyk? A.Shedoesn'tbudgetcarefully. B.Shecomplainsalotaboutherjob. C.Sheisafanofthriftshopping. D.SheisknownasQueenofGreen. 4Whatistheauthor'sattitudetowardthriftshopping? A.Conservative. B.Cautious. C.Doubtful. D.Supportive.
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8分Someofthebestresearchondailyexperienceisrootedinratesofpositiveandnegativeinteractionswhichhasprovedthatbeingblindlypositiveornegativecancauseotherstobefrustratedorannoyedortosimplytuneout. Overthelasttwodecadesscientistshavemaderemarkablepredictionssimplybywatchingpeopleinteractwithoneanotherandthenscoringtheconversationsbasedontherateofpositiveandnegativeinteractions.Researchershaveusedthefindingstopredicteverythingfromthelikelihoodthatacouplewilldivorcetothechancesofaworkteamhavinghighcustomersatisfactionandproductivitylevels. MorerecentresearchhelpsexplainwhythesebriefexchangesmatterSomuch.Whenyouexperiencenegativeemotionsasaresultofcriticismorrejectionforexampleyourbodyproduceshigherlevelsofthestresshormonewhichshutsdownmuchofyourthinkingandactivatesconflictanddefensemechanisms机制.Youassumesituationsasbeingworsethantheyactuallyare. Whenyouexperienceapositiveinteractionitactivatesaverydifferentresponse.Positiveexchangesincreaseyourbody'sproductionofoxytocin后叶催产素afeel﹣goodhormonethatincreasesyourabilitytocommunicatewithcooperatewithandtrustothers.Buttheeffectsofapositiveoccurrencearelessdramaticandlastingthantheyareforanegativeone. Weneedatleastthreetofivepositiveinteractionstooutweigheveryonenegativeexchange.Badmomentssimplyoutweighgoodones.Whetheryou'rehavingaconversationkeepthissimpleshortcutinmindAtleast80percentofyourconversationshouldbefocusedonwhat'sgoingright. Workplacesforexampleoftenseethis.Duringperformancereviewsmanagersroutinelyspend80percentoftheirtimeonweaknessesandareasforimprovement.Theyspendroughly20percentofthetimeonstrengthsandpositiveaspects.Anytimeyouhavediscussionswithapersonorgroupspendthevastmajorityofthetimetalkingaboutwhatisworkingandusetheremainingtimetoaddressweaknesses. 1TheunderlinedphrasetuneoutinParagraph1probablymeans. A.stoplistening B.gaincourage C.singaloud D.feelstressed 2Whatwillhappenifyouexperiencenegativeemotions? A.Thesituationaresuretobecomeworse. B.Muchofyourthinkingwillbeprevented. C.Youwillfeelanurgetoimproveandbecomebetter. D.You'llbemotivatedtoresolveconflictswithpeople. 3FromParagraph4wecanlearnthat. A.weneedapositivefeelingtobeatonenegativefeeling. B.positiveinteractionshavegreatereffectsthannegativeones. C.ourconversationshouldcenteronwhatneedsimprovement. D.theeffectofnegativefeelingslastslongerthanthatofpositiveones. 4Whichisthebesttitleforthepassage? A.HarmfulNegative. B.MorePositiveInteractions. C.HowtoBeaProductiveManager. D.LessTimeonStrengthsandPositiveAspects.
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AlltheHarryPotterbooksbyJoanneRowlingapoorsinglemotherinEdinburghallovertheworld. A.livesarewellsold B.livessellgood C.livingsellwell D.livingarewellsold
Theweatheraffectsmanyaspectsofpeople'sdailylife.Knowingandunderstandingwhattheweatherisdoingisuseful. Howevertheweatherisalsooneofthemostunpredictableelementsintheworld.Althoughmanypeoplewatchthemorningnewsandgathertheinformationabouttheweatherthisisoftenwrong.Wholedayscanberuinedbybelievingthattheweatherwillbeonethingwhenitturnsouttobeanother.Howeverowningwirelessweatherstationsallowstheownerstomonitortheweatherforthemselves. Notonlywilltheseweatherstationsallowtheownerstoseewhattheweatherisdoingbutitispersonalizedtothemandtheirarea.Wirelessweatherstationsarespecificallypreparedfortheimmediateneighborhood.Planswillbeabletobemadeandimportantdecisionswillnolongerberuinedbybadweather. Althoughtheseweatherstationsaretypicallyseeninhomestheycanalsobeusedveryeasilyonfarmsandfishingboats.Bothfarmersandfishermenrelyontheweatherfortheirbusinessandusingup﹣to﹣dateweatherinformationisquiteindispensable.Byusingthewirelessweatherstationsitcandetermineforthemwhentoharvestcropsandheadbacktotheshore.Duetothesizeoftheweatherstationstheycanbemovedveryeasilyandusedwhereverisnecessaryforpeople. Thewirelessweatherstationsaregreatforallhomesespeciallyforareasthatsufferfromextremeweatherconditions. Theup﹣to﹣dateinstantweatherreportswillallowapersontomonitorwhattheweatherisdoingandifthebadweatherisheadingintheirdirection.Extremeweathertendstocomeveryquicklythereforeanyinformationthatisreceivedishelpful. Theweatherstationsareverysimpletosetupandarerunbysolarpanels太阳能电池板ensuringtheywillworkevenifthereisapower﹣cut.Theyarefarsmallerthanthoseinpreviousyearsandgiveacoupleofverysimpleread﹣outsfortheowner.Theyareeasytouseandfascinatingtounderstand. 1FromParagraph2theauthorintendsto. A.showushowunpredictabletheweatherusedtobe B.explainthevalueofhavingwirelessweatherstations C.makeitclearhowpopularthemorningnewsis D.showhowpeoplegotweatherinformationinthepast 2WhatdoestheunderlinedwordindispensableinParagraph4mean? A.Essential. B.Indifferent. C.Attractive. D.Impossible 3Whatcanwelearnaboutawirelessweatherstation? A.Theinformationitprovidesisslowbutmorespecific. B.Itishardtosetupbutcanbemovedfromoneplacetoanother. C.Itiseconomicalandsavesmoneyinthelongrun. D.Itcancontinuetoworkevenifthereisapowerfailure 4What'sthemainideaofthetext? A.Theweatheranditseffectsonpeople'sdailylife. B.Theweather﹣themostunpredictableelementintheworld. C.Goodreasonsforhavingwirelessweatherstations. D.Theimportanceofknowingandunderstandingtheweather.
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关于电磁波下列说法正确的是
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Giveyourselfatest.Whichwayisthewindblowing?Howmanykindsofwildflowerscanbeseenfromyourfrontdoor?Ifyourawarenessisassharpasitcouldbeyou'llhavenotroubleansweringthesequestions. Mostofusobservedmuchmoreaschildrenthanwedoasadults.Achild'sdayisfilledwithfascinationnewnessandwonder.Curiositygaveusallanaturalawareness.Butdistinctionsthatweresharptousaschildrenbecomeunclearwearenumb麻木的tonewstimulation刺激newideas.Relearningtheartofseeingtheworldaroundusisquitesimplealthoughittakespracticeandrequiresbreakingsomebadhabits. Thefirststepinawakeningsensesistostoppredictingwhatwearegoingtoseeandfeelbeforeitoccurs.Thisblocksawareness.OnechillynightwhenIwashikingintheRockyMountainswithsomestudentsImentionedthatweweregoingtocrossamountainstream.Thestudentsbegancomplainingabouthowcolditwouldbe.Wereachedthestreamandtheyunwillinglywalkedahead.Theywerealmostknee﹣deepwhentheyrealizeditwasahotspring.Latertheyalladmittedthey'dfeltcoldwateratfirst. Anotherblocktoawarenessistheobsession痴迷manyofushavewithnamingthings.Isawbirdwatcherswhospottedabirdimmediatelylookeditupinfieldguidesandsaidaruby﹣crownedkingletandcheckeditoff.Theynolongerpaidattentiontothebirdandneverlearnedwhatitwasdoing. Thepressuresoftimeanddestinationarefurtherblockstoawareness.Iencounteredmanyhikerswhowereheadedtoadistantcamp﹣groundwithjustenoughtimetogettherebeforedark.Itseldomoccurredtothemtowanderabittotakeamomenttoseewhat'saroundthem.Iaskedthemwhatthey'dseen.Ohafewbirdstheysaid.Theyseemedbentontheirdestinations. Natureseemstounfoldtopeoplewhowatchandwait.Nexttimeyoutakeawalknomatterwhereitistakeinallthesightssoundsandsensations.Wanderinthisframeofmindandyouwillopenanewdimensiontoyourlife. 1AccordingtoParagraph2comparedwithadultschildrenaremore. A.anxioustodowonders. B.sensitivetoothers'feelings. C.likelytodevelopunpleasanthabits. D.eagertoexploretheworldaroundthem. 2WhatideadoestheauthorconveyinParagraph3? A.Toavoidjumpingtoconclusions. B.Tostopcomplainingallthetime. C.Tofollowtheteacher'sadvice. D.Toadmitmistakeshonestly. 3Thebirdwatchers'behaviorshowsthatthey. A.areverypatientintheirobservation. B.arereallyfascinatedbynature. C.careonlyaboutthenamesofbirds. D.questiontheaccuracyofthefieldguides. 4Inthepassagetheauthorintendstotellusweshould. A.filloursensestofeelthewondersoftheworld. B.getridofsomebadhabitsinourdailylife. C.openourmindtonewthingsandideas. D.tryourbesttoprotectnature.
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如图是过山车的部分模型图．模型图中光滑圆形轨道的半径R＝8.1m该光滑圆形轨道固定在倾角为α＝37°斜轨道面上的Q点圆形轨道的最高点A与P点平齐圆形轨道与斜轨道之间圆滑连接．现使小车视作质点从P点以一定的初速度沿斜面向下运动已知斜轨道面与小车间的动摩擦因数为μ＝不计空气阻力过山车质量为20kg取g＝10m/s2sin37°＝0.6cos37°＝0.8．若小车恰好能通过圆形轨道的最高点A处求 1小车在A点的速度为多大 2小车在圆形轨道的最低点B时对轨道的压力为重力的多少倍 3小车在P点的动能．
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Whentodangermentendtoincreasebloodpressurenervousoranxious. A.exposedfeeling B.exposedfelt C.exposingfelt D.exposingfeeling
2分ThenthatDollyhadbecomeseriouslyill.CloningscientiststofindthatDolly'sillnessweremoreappropriatetoamucholderanimal.
10分ToreachonelocalrestaurantabowlofChinesenoodlestravelsacrosstheEurasiancontinentandsettlesontheScandinavianPeninsula1placebeforehungrypeoplevisitingthehomeofSantaClaus. AChinesemanbroughtlocaldishesreganmianandhotpottoRovaniemiFinlandbecomingthefirstChinese2openanrestaurantintheArcticCircle. HuLiangfromCentralChina'sHubeiprovincemigratedtoFinlandaftergraduationat21.Fortwelveyearhe3seemoreandmoreChinesetouristsvisitingthecountrytoenjoythewinterholidayAuroraBorealis北极光﹣andofcoursethepurported传说的homeofSantaClaus. Chinesepeoplearebecoming4richandmoreinternational.5hasnotchangedistheir6stomach.SoImade7decisiontoopentherestaurant. Hu'srestaurantservesreganmianatraditionalWuhannoodledishwithspicyflavorandasesamepaste芝麻酱dressingaswellasChinesehotpot.HeordersfoodmaterialsfromChinesetradecorporationsthroughe﹣commenceplatformsand8e﹣paymentpopularamongChinesepeoplesuchasAlipay. 9apriceof15euro$18.45abowlofreganmianisnotonlygreatcomfortforChinesetouristswhohavetraveledfromthousandsofmiles10butalsoanattractiontolocalFinns.
1分Whynotkeepadictionaryathandforc?Youcanlookupintothedictionarywheneveryoumeetnewwords.
Therearethreemainclassesofdrugshasadifferenteffectonthebody. A.allofwhich B.andallofthem C.eachofthem D.ofwhicheach
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