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在极坐标系中，直线被圆ρ=2asinθ（a＞0）所截弦长为2，则a= ．
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高三下学期数学《》真题及答案
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已知在平面直角坐标系中圆的参数方程为为参数以为极轴建立极坐标系直线极坐标方程为则圆截直线所得弦长为.
已知圆C.的参数方程为θ为参数以原点为极点x轴的正半轴为极轴建立极坐标系直线l的极坐标方程为ρsin
2017年·大庆二模在直角坐标系xoy中直线l的参数方程为t为参数以原点O为极点x轴正半轴为极轴建立
以平面直角坐标系的原点为极点x轴的正半轴为极轴建立极坐标系两种坐标系中取相同的长度单位.已知直线l的
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以平面直角坐标系的原点为极点x轴的正半轴为极轴建立极坐标系两种坐标系中取相同的长度单位.已知直线l的
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己知在平面直角坐标系xOy中圆O的参数方程为α为参数.以原点O为极点以x轴的非负半轴为极轴的极坐标系
选修4—4坐标系与参数方程在极坐标系中圆C.的极坐标方程为以极点为原点极轴为x轴的正半轴建立平面直角
在极坐标系中直线被圆所截得的弦长是____
在极坐标系中圆是以点为圆心为半径的圆.1求圆的极坐标方程2求圆被直线所截得的弦长.
2015年·甘肃省一模理科在直角坐标系xoy中直线l的参数方程为t为参数以原点O为极点x轴正半轴为
坐标系与参数方程选做题在极坐标系中直线被圆截得的弦长为_______________.
在直角坐标系xOy中直线l的参数方程为t为参数若以O.为极点x轴正半轴为极轴建立极坐标系则曲线C.的
已知在平面直角坐标系xOy中圆C的参数方程为ϕ为参数以Ox为极轴建立极坐标系直线l的极坐标方程为c
在平面直角坐标系中以原点O.为极点x轴的正半轴为极轴建立极坐标系.已知圆ρ＝所截得的弦长为2求θ0的
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已知在平面直角坐标系中圆的参数方程为为参数以为极轴建立极坐标系直线极坐标方程为则圆截直线所得弦长为
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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
已知圆C.的参数方程为θ为参数以原点为极点x轴的正半轴为极轴建立极坐标系直线l的极坐标方程为sinθ
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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. 删除把多余的词用斜线\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. ChinaandWesterncountrymayhavedifferentculturalbeliefsaboutcertainanimals.Butwhenitcomestopigswesomehowreachanagreementthatpigsarelazyuglystupidlyandshameless.Neitherofthesewordsdescribingpigsareexactlypositive.Moreoverthetruthiswhatpigshavesomegoodqualities.Andthere'sprobablynogoodtimetocleartheirnamesthannowwiththearrivaloftheYearofthePigonChineseSpringFestivalwhichfellFebruary5thisyear.Accordingtoapaperpublishingin2017pigscantellbetweenthosewhotreatthemwellorthosewhodon't.Perhapsthesearethequalitiesofpigstokeepitinmind-theirintelligencecutenessandpatience.
AllworkandnoplaymakesJackadullboy.Butnowscientistshavegivenusanotherwarningtoomuchplaywithsmartphonesorcomputersmakesyoudulltoo. Manyfocusonthebenefitsofdigitaldevices设备ineducationbutignorethecostssaidPatriciaGreenfieldfromtheUniversityofCaliforniaLosingtheabilitytounderstandtheemotionsofotherpeopleisoneofthecosts. Greenfieldandherresearchteamdidanexperiment.Theyworkedwith105childrenwhospendabout4.5hoursinfrontofscreensonaschoolday.Thestudentswereaskedtodescribetheemotionstowardsthepicturesandvideosofpeoplewhowerehappysadangryorscared.Thenhalfofthemattendedafive-daynatureandsciencecamp.TheretheyhadnosmartphonesTVorcomputers.Theotherhalfstayedinschoolandspentthefivedaysasusual. Fivedayslaterallthechildrentookthetestagain. Studentswhohadbeentothecampgotabout5percentmoreanswerscorrectthantheyhaddonebeforethecamp.Buttheothergroupofstudentsdidn'tshowmuchimprovement.Thestudyisnotperfectinsomesensesaidtheresearchers.Butscientistssaythatthestudyisstillawarningforus. Emotionalskillsdevelopinpracticeandthebraindevelopsthroughrealinteraction.saidProfessorTayloraprofessorattheUniversityofSanFrancisco.Researcherstalkedto2000parentsofchildrenaged2-16intheuKaboutwhatactivitiestheirchildrencoulddoconfident. TheresultsweresurprisingTheirchildrencoulduseatablet平板电脑59%andworkamobilephone57%moreconfidentlythantheycouldtietheirshoelaces鞋带53%! SospendmoretimeawayfrommobilephonesandcomputersifyouwanttobeanunderstandingfriendandnotamemberofwhattheDailyMailcalledGenerationHelpless. 1WhatdoesusingdigitalmediaineducationleadtoaccordingtoProfessorGreenfield? A.Gettingonbadlywiththeirfamilymembers. B.Failingtorelatetootherpeople'semotions. C.Makingmoremistakeswhentakingexams. D.Fallingfarbehindothersinallschoolwork. 2Whataretheresultsofgreenfield'sexperimentinscientists'opinion? A.Farfromperfect. B.Quitesurprising. C.Needingtobeimproved. D.Alarmingforpeople. 3Whatisthepurposeoftheauthor'swritingthetext? A.Studentsshoulddescribeemotionsintheexperiment. B.Studentsshoulddomuchbetterwiththedevices. C.Studentsshouidbefarawayfromthosedigitaldevices. D.Teachersshouldteachstudentstotietheirshoelaces. 4Whatisthebesttitleforthetext? A.Screensharmemotions. B.Herecomesadigitalworld! C.StayawayfromtheInternet. D.Howpeoplebecomeaddicted?
RecentlyIcameacrossashortstorysentinbyareaderDianaMcculloch.InterestedIgaveheracalltoaskforthewholething.Shedescribedastoryaboutheryoungestson.Shewaswatchingtelevisiononenightwithherhusband.Around11o'clockshesuddenlydoubledoverinstomachpain.Itwasstrangebecauseshedidnteatanythingoutoftheordinary.ThenextmormingDianacalledtocheckonhersonwhowasinrecoveryfromtheillness.Thatwaswhenshediscoveredherelapsedthenightbefore.Hehadhisstomachpumpedjustaround11p.m. IgotoffthephonewithDianashocked.Suresharinginthesufferingofothersisafeatureofmanypeople.Butisitreallypossibletoexperienceanother'spainasifit'syourown? Theanswerisyesandthat'ssomethingDr.LarryDosseysaysinhisbookOneMind.Dr.Dosseyarguesthere'sahigherconsciousnessorOneMind.Hereferstothisexperienceastelesomaticexperienceassumingit'sanecessarypartofthehumanexperienceoftendrivenbydeepemotionalbonds.Itshowsthatwe'reconnectedinawaythatgoesbeyondphysicalbarriersevendistanceandtime.ThecommonpathinallOneMindmomentsistheexperienceofahyperreal超现实的levelofawarenessandconnectionwithagreaterwholebothofwhicharedippedinanexperienceofdeeplove.Dr.Dosseywrites. IthoughtbacktoDiana'sexperiencewithherson.Perhapsitwasn'tamomentofmereintuition直觉orsharingfeelingsbutareflectionofagreaterloverunningthroughhumanityaglimpseathowconnectedwealltrulyare. 1WhathappenedtoDianaMcCullochthatnight? A.Sheatesomethingbadcasually. B.Shepumpedherstomachcarefully. C.Shesufferedapaininstomach. D.Shegaveacalltocheckonherson. 2Whatdoestheunderlinedwordrelapsedprobablymean? A.getsad. B.gettired. C.getlonely. D.gotworse. 3WhichofthefollowingwillDr.Larryprobablyagreewith? A.Dianasexperiencehasastrongconnectionwithlove. B.Distanceandtimewillsurelypreventsuchexperience. C.ThehighestconsciousnessistheexperiencelikeDiana's. D.Emotionalbondshavenothingtodowithsuchexperience. 4Whatcanweinferfromthetext? A.Dianacaredlittleabouthersons. B.Diana'sexperiencewasnotpainful. C.Suchexperiencereflectsgreatloveinhumanity. D.Apersondefinitelycanexperienceotherspain.
RecentlyImetaguynamedLeonardGilbertonatrip.Leonardisthekindofpeopleyoucouldpassonthestreetandnever1butheisinmyviewaveryspecialpersonwho2recognition. Leolivesina3ruralareasowhenhiswifehadcancerseveralyearsagoLeowasfacedwithafour-and-a-half-hourdrivetowhereshecouldbetreated.That4lotsofexpenseformealsfuelhotelsandsoon.Butintheendthecancertookhiswife5. EvidentlyLeowasvery6byhiswife'spassingbuthewasalsoveryangryforherealizedotherpeoplewerefacingthesamesortsof7.Ratherthangivingmoneytocharitieswhathedidwasstarttothrow8. EveryotherSaturdayeveningthereisapartyinLeo'sgarage.Neighboursfriendsandrelativescomeandbringsnacksanddrinksmanybring9thereismusicanddancingandatsomepointduringtheeveningLeo10afamilyhehasfoundwhoarehavingdifficulties11thecostofsupportingacancerpatientundergoing12farfromhome.Thenahoney-jarispassedaroundandthemoney13everycentofitgoes14tothatfamily.Thepeopleatthepartyhaveagoodtime.Thefamily15thatsomeoneprobablysomeonetheyhavenevermetknowswhattheyaregoingthroughand16enoughtohelp. Leo's17tohelpthefamiliesofothercancerpatientswasbornoutofhisgriefbutfromtheperspectiveofthosewhohavereceivedthemoneyitisanactoflove.Hispersonal18hasresultedinanactofkindnessthathonoursthe19ofthewifehehaslost.Wouldn'titbeniceifwehadmorepeopleintheworldlikeLeonardGilbert?I'mgladImetLeo.Hemakestheworlda20place. 1A.know B.notice C.forget D.love 2A.requires B.needs C.deserves D.avoids 3A.convenient B.peaceful C.remote D.nearby 4A.meant B.spent C.showed D.reduced 5A.otherwise B.instead C.somehow D.anyway 6A.stricken B.shocked C.pleased D.mourned 7A.happiness B.hardships C.cancers D.expenses 8A.coins B.honey C.medicine D.parties 9A.jars B.cards C.instruments D.flowers 10A.tellsabout B.arguesabout C.commentson D.chatsabout 11A.cutting B.meeting C.increasing D.calculating 12A.charities B.depression C.treatment D.support 13A.saved B.paid C.owed D.collected 14A.partly B.exactly C.properly D.directly 15A.understands B.pretends C.ignores D.confirms 16A.earns B.cares C.struggles D.plans 17A.demand B.motivation C.expectation D.consideration 18A.donation B.opinion C.loss D.belief 19A.cancer B.memory C.wish D.recovery 20A.better B.worse C.morepeaceful D.moreterrible
StudentTutoringProgramStutor—Gram TheStudentTutoringProgramStutor—Gramisdesignedtohelpyousucceedinyourclasses.Researchhasshownthatstudentswhoactivelyparticipateinstudent—ledtutoringcanimprovetheirgradesbyuptoonefullletter—gradeoverthecourseofasemester.Stutor—Gramcanhelpyoutoearnyourbestpossiblegrade. AlltutorsinStutor—GramhaveearnedA'sinthecoursestheytutorandhavereceivedspecialtrainingapprovedbytheNationalTutoringAssociationNTA.Stutor—Gramoffersbothindividualandgrouptutoring. PleaseNoteTutoringworksonlyifyouworkatit!Togainthefullbenefitsfromtutoringyoumustattendyourweeklytutoringsession.Consideryourschedulebeforerequestingatutor.Youmustcommittoweeklytutoringsessionsfortheentiresemester. ToObtainaTutor 1.ReporttotheTutoringCenterlocatedintheadministrativecenter. 2.FilloutaRequestforTutoringformforeachcourseforwhichyoudesireatutor.Filloutthisformascompletelyaspossiblesoyourrequestcanbehandledquickly. 3.TutorsareappointedonaFIRSTCOMEFIRSTSERVEbasis.Comeearlytoensurethatyouwillgetthetutoryouneed. 4.Thetutorwillcontactyoutoarrangemutually相互的agreeabletutoringtime. 5.AlltutoringwilltakeplaceattheTutoringCenter. Stutor—Gramwilloffertutorsforthefollowingcoursesthissemester SCI101Biology SCI102Chemistry SCI103Physics MATHAConceptsinMathematics MATH101Algebra MATH102Geometry ENGLISH101WritingPersuasiveEssays ENGLISH102WritingCollegeApplicationEssaysWelookforwardtohelpingyoumakethegrade! 1Theauthor'spurposeinwritingthetextismostlikelyto. A.inform B.describe C.entertain D.persuade 2Thistextwouldbemosthelpfultostudentswho. A.attendaprivatehighschool B.areinterestedingettingbettergrades C.havegraduatedfromhighschool D.needarecommendationforcollege 3Toobtainatutorformorethanoneclassstudentsmust. A.payadditionalfees B.callthetutoringoffice C.reporttheirplanstotheirteachers D.filloutaseparateformforeachclass 4Afterrequestingatutorstudentsshould. A.waittobecontacted B.beginworkonthefirsthomeworkassignment C.showupattheTutoringCenterforthefirstsession D.sendacopyoftheirscheduletotheTutoringCenter 5Whichofthefollowingcoursescanstudentstakethissemester? A.SCI101andMath103. B.MathAandEnglish103. C.SCI103andEnglish102. D.SCI102andMath103.
—!Somebodyhasleftthelabdooropen. —Don'tlookatme. A.Dearme B.Hithere C.Thankgoodness D.Comeon
Forallthefailureofhisbusinessheremainsoptimisticanduntroubledbyhisproblems. A.hopefully B.seemingly C.rarely D.frequently
Allchildrenshouldgetaccesstoahigh—qualityeducationtheirracezipcodeorfamilyincome. A.dueto B.regardlessof C.apartfrom D.dependingon
Wemostprefertosayyestotheofsomeoneweknowandlike. A.attempts B.requests C.doubts D.promises
Cancreativitybetaught?That'saquestionwithoutasimpleyesornoanswer.Creativitymaynotbeabletobetaughtdirectlybutwhatyoucangetbetteratisfrequentlytargetingatthecircumstancesoflifewhichbringupthegreatestchancesfortruecreativeexpression.1butmorelikesomethingwhichmanifests显现itselfinsidethosewholearntodevelopitandcreatetherightconditionsforit. Limityourselectionoftoolstoonlythemostvital.2.You'llbesharperthansomeonewhomerelyfightswithalargersetoftools. Learnhowtoberesourceful.3.Creativityisnotjustaboutcreatingsomethingnewbutmakingoldthingsworkbetteraswell.Thinkofcrazypossibilitiesaswellaspracticalones.Youmightfindinspirationforaworkablesolutioninoneofyourideas. Don'tlistentofeedback反馈andkeepfollowingyourownpath.Theproblemofaskingforfeedbackisthatthefeedbackwillbegivenaccordingtotheperson'spastexperience.Otherswillunconsciouslypushyouinadirectionthattheyseeasbest.4.Justdon'tletcriticismeventheconstructingtypedestroyyourcreativityduringthecreativeprocess. 5.Routinesarepositiveiftheystrengthenahealthycreativeconsciousnessandnegativeiftheydestroythat.Thekeyistodiscoveracreativeroutinethatputsyouinamorecreativemindset. A.Creativityisnotlikealightningstrike B.Havingaroutineisactuallynotabadidea C.Youcanliterallydoanythingyoulikewiththem D.Resourcefulnessisaboutmakingthemostofwhatyouhavetoworkwith E.Themorelimitedyoursetoftoolsisthemorecreativetheoutputwillbe F.Thisisdonewithgoodintentionsbutitactuallyhurtsyournaturalcreativity G.Whilebreakingyourroutineonceinawhiletoforcenewwaysofthinkingisgood
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