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乒乓球运动的高抛发球是由我国运动员刘玉成于1964年发明的，后成为风靡世界乒乓球坛的一项发球技术．某运动员在一次练习发球时，手掌张开且伸平，将一质量为2.7g的乒乓球由静止开始竖直向上抛出，抛出后向...
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高三下学期物理《》真题及答案
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发球时发球运动员将球抛出且落到地面但没有挥动球拍击球裁判员应判
发球方违例；
接发球方违例；
重发球
在乒乓球比赛中有一次某运动员采用如下的高抛发球他紧贴台面将球向上抛出球竖直上升1.5m后下落在距离台
1.5 m，0.3 m
2.7 m，0.3 m
2.7 m，1.8 m
1.8 m，0.3 m
我国乒乓球运动员于年第一次荣获了男子乒乓球世界冠军
____年____月中国运动员囊括了第三十六届世界乒乓球锦标赛全部7项冠军创造了世界乒乓球赛年历史上
下列运动属于平移的是
）乒乓球比赛中乒乓球的运动. （
）推拉窗的活动窗扇在滑道上的滑行. （
）空中放飞的风筝的运动. （
）篮球运动员投出的篮球的运动.
观看乒乓球比赛国人都希望中国选手能够获得比赛的最终胜利无论中国运动员每一球的得失分都不会吝啬自己的掌
掌声应该献给精彩，不分国籍和地区
在自己支持球队的对手出现失误后，发出嘘声和起哄
在自己支持的球队发球时可以用闪光灯拍照
在发球或对攻时呼喊运动员名字助威呐喊
发球运动员发球时球过网后挂在网上应判违例
乒乓球运动的高抛发球是由我国运动员刘玉成于1964年发明的后成为风世界乒兵球坛的一项发球技术．某运
0.4N
4N
40N
400N
乒乓球比赛运动员发现发球擦网可以自己中断比赛
当今我国乒乓球直拍横打使用最多的著名运动员是
乒乓球双打比赛中某运动员发球时将球发到对方的左半台则判发球方失分
乒乓球在我国有广泛的群众基础并有国球的美誉在2008年北京奥运会上中国选手包揽了乒乓球四个项目的全部
球的初速度大小
发球时的高度
球从发出到第一次落在球台上的时间
球从发出到被对方运动员接住的时间
在乒乓球比赛中运动员在发球的同时发出跺脚声其作用是增加发球的力量
首次夺得奥运会乒乓球双打金牌的中国运动员是
抛体运动在各类体育运动项目中很常见如乒乓球运动．现讨论乒乓球发球问题设球台长2L网高h乒乓球反弹前后
乒乓球比赛中共有11种情况可判失分以下可判失分
运动员或运动员穿戴的任何物件触及球网装置
不执拍手触及比赛台面
发球连续3或3次以上檫网
某方运动员没能公平比赛或有辱骂裁判、冒犯观众等行为，经警告后重犯
奥运会乒乓球比赛采用单败淘汰制每局比赛打满分观看乒乓球比赛时照相的会干扰运动员的视野运动员发球时不合
五局三胜，21，拍照声
七局四胜，11，闪光灯
三局两胜，15，闪光灯
九局五胜，11，拍照声
乒乓球运动员可能会携带易燃的
乒乓球
粘胶
专用胶水
乒乓球板
中国乒乓球运动员的技术风格是
发球抢攻
直板握法
快、狠、准、多变
1959年我国运动员容国团获得了世界乒乓球竞标赛单打冠军
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Ifvolunteeringbeginsatanearlyageitcanbecomepartofachild'slife﹣somethingheorshemayjustexpectandwanttodo.Itcanteachthem Asenseofresponsibility.Byvolunteeringchildrenandteenslearnhowtobeontimeforajobdotheirbestandbeproudoftheresults.Andtheyalsolearnthatintheendweareresponsibleforthewellbeingofourwholecommunity. Theknowledgethatonepersoncanmakeadifference.Awonderfulmessageforachildisthatheorsheisimportantenoughtohaveaneffortonsomeoneorsomethingelse. Thebenefitofsacrifice奉献的好处.Bygivingupatoytoalessfortunatechildachildlearnsthatitisgoodtosacrificesometimes.Cuttingbackonplayingtimetohelpcleanupastreettellskidsthatthereareimportantthingsotherthanourselvesandourneeds. Tolerance容忍.Workingincommunityservicecanbringkidsandteensintouchwithpeopleofdifferentbackgroundsabilitiesagesandeducation.Theywilllikelyfindthateventhemostdiversepeoplecanbeunitedbycommonvalues. Jobskills.Communityservicecanhelpyoungpeopledecideontheirfuturecareers.Learningtoworkasateammembertakingonleadershiprolessettingprojectgoals﹣theseareallskillsthatcanbelearnedbyvolunteeringandwillserveachildwellinanyfuturecareer. Howtofillfreetimewisely.Ifachildisnotinterestedintraditionalafterschoolactivitiescommunityservicecanbeawonderfulchoice. 1Youhelpastudentwhocan'tgotoschoolbecauseofmoney.Thatisabout. A.asenseofresponsibility B.jobskills C.tolerance D.thebenefitofsacrifice 2Ifyouhavetogetonwithallkindsofclassmates﹣hardworkingorlazyworkaholicorplayfirstpoliteorrudeetc.whatyouneedmostis. A.tolerance B.theknowledgethatonepersoncanmakeadifference C.thebenefitofsacrifice D.asenseofresponsibility 3TheunderlinedworddiverseinPara.5probablymeans. A.interesting B.different C.personal D.selfish 4Whatwouldbethebesttitleforthispassage? A.WhattoDoasaVolunteer B.WhatYouCanLearnfromVolunteering C.HowtoBeaGoodVolunteer D.LearntoBeaVolunteer
阅读下面短文根据所给情节进行续写使之构成一个完整的故事. WhenRyanfirstturnedupforMs.Rose'sclasshewaskindofnervousbecausehe'dheardMs.Rosecouldbearealmonstersometimes.ButasMs.Rosestartedwithanoverviewofwhatthey'dbedoingduringtheyearinapleasantvoiceshelookedniceenough.Thenwithamoreseriousoneshewarnedthestudentsthatshe'dbegivingthemhomeworkassignmentswhichwerenottobehandedinlateandtheyweretobecompletedfully.Noexcuse!Noextensions! Thatdaysheassignedtheclassitsfirsthomework.Theyhadtodoasheetofmathproblemsandreadashortstory.Itwasn'tdueuntilThursdaybutshesuggestedtheydoitimmediatelythatnight.Homeworkhasawayofpilingup.shesaidhereyesnarrowingslightly.ButtodaywasonlyMonday!TherewasplentyoftimeRyanthought. SowhenschoolwasoverRyanandhisfriendsranofftoplaybaseball.ExhaustedafterthegameheentertainedhimselfwithhisfavoriteTVshowleavinghishomeworkasideonhisdesk.DayspassedquicklyRyanwasfreeofworriesmostofthetimewhileMs.Rosejustoccasionallyremindedthemofthedeadlineandthatshewouldn'ttolerateanyonenothavingdoneit. Wednesdayafterdinnerhesuddenlyrealizedthathishomeworkwasduenextday.Heracedtohisdeskandwasgreetedwiththemostcuriousthing.Thepileofhomeworkreallyhadgrowntaller.Ohno!Whatwashegoingtodo?Itlookedasifthepapershadtoweredoverhimalmostsoaringuptotheceiling. Hereallyneededtogetstarted.Hedidalittlebithereandtherebuthekeptdistractedbyotherworkwaitingforhim.Finallyhecouldn'tevenlocatethehomeworkhe'dstartedwith.Frustratedhegaveupandwenttobed.Ryantossedandturnedallnightandhaddreamsofpapermountainsburyinghimalive. ThenextmorningwhenRyanenteredtheclassroomhefoundMs.Rosewaitingherfaceddarkwithrage.ObviouslyRyanwasn'ttheonlyonewhosufferedfromthemysteriouslygrowingassignments. 注意 1.所续写短文的词数应为150左右 2.至少使用5个短文中标有下划线的关键词语 3.续写部分分为两段每段的开头语已为你写好 4.续写完成后请用下划线标出你说使用的关键词语. Paragraph1 FailingtomeetthedeadlinethestudentshadtowatchasMs.Rosetransformedintotherealmonster. Paragraph2 WithasatisfiedsmileMs.Rosefinallyreleasedeveryonebutassignedtheclasssomeextrahomework.
Residents居民inthepoorestareasintheU.S.facealifeexpectancy平均寿命uptodecadeshorterthanthoseinthewealthiestareasaccordingtoastudypublishedintheAmericanJournalofPublicHealth. ResearchersfromEastTennesseeStateUniversitywantedtobetterunderstandhowsocioeconomicstatuswasassociatedwithhealthoutcomes.Tofindouttheydividedthecountry's3141areasinto50newstateswith2percentoftheareasineachbasedonhouseholdincomeratherthanongeography. Theresearchersbrokedownthedatabycounty郡县sincetheyfoundstate﹣leveldatamayhidesomeeffectofsocioeconomicdifferencesonboththebest﹣offandworst﹣offcounties.Theythenexaminedhealthdatafromthewealthiestandpooreststatestopandbottom2percenttoseehowresidentsdifferedonfactorslikesmokingclinicalcareandexcessive过多的drinking.Researchersfoundthattherewasnearlya10﹣yeargapinthelifeexpectancyofmenwithanaverageof79.3yearsinthewealthycountiescomparedto69.8yearsinthepoorest.Forwomenthedifferencewasslightlyless83yearsinthewealthiestcountiesand76yearsinthepoorest. Thestudyauthorswerecautiousthatwhiletheyfoundaconnectionbetweensocioeconomicstatusandhealthoutcomestheydidnotanalyzecauseandeffect.Buttheysuggestthatthedatashowshowpolicymakersshouldnotjustfocusonstate﹣wideinitiatives主动性butmoretargetedeffortstohelpthosemostatrisk.Withlimitedresourcesmethodsofknowingthepoorestareasexactlycanbequitesignificantintheequaldistribution分配ofresourcesandprogramstothosecommunitiesthatareinthegreatestneed''thestudyauthorswrote. 1HowdidResearchersdividetheareas? A.Bysocialstatus B.Byincome C.Byhealth D.Bylivingplaces 2WhichofthefollowingisTRUEaccordingtoParagraph3? A.Thewomendifferenceislessthanthemaninlifeexpectancy. B.Thewealthieststatelikehidingtheirwealth. C.Mosthealthdataisunbelievable. D.Mostpooreststatesmokeanddrinkalot. 3Whatcanweinferfromthelastparagraph? A.Theresearchersthinktheirstudyisperfect. B.Peoplestilldon'tknowthecauseoflifeexpectancy. C.Thegovernmentshouldlearnsomethingfromthestudy. D.TheAmericanresourcesdistributionisnotfairatall. 4Whatwouldbethebesttitleforthepassage? A.Waystohavealonglifeexpectancy B.GreatincomedifferencesintheUSA C.ThehealthproblemintheUSA D.Meninrichest10yearslongerinpoorest
Atfirstglancethebusinessworldisnoplaceforyoungwomenasmyco﹣foundersandIhavebeentoldonmanyoccasions.Inspiteofthispessimisticviewofwomen'sopportunityinbusinesswethreecollege﹣agegirlwithzeroexperienceinbusinessstartedoffwithahighlyambitiousgoaltostartaseaweedfarminNorthCaliforniaandgrowasmuchseaweedaspossibletohelpreducecarbonemission排放andnutrientpollutionfromagriculturalsources. Inthebeginningourideaswereeitherignoredorscoffedbytheresearchersfromwhomwesoughthelpandadvice.Butwecarriedonwithourresearch﹣ifotherswouldn'tprovideusanswersweweren'tafraidtoworkthemoutourselves.Wediscoveredwhichspeciescouldgrowinwarmerwatersandwe'didentifiedpotentialmarketsintowhichweplannedtoselltheproducts.We'vespentthelasttwoyearssettingupthefirstseaweedfarminNCapplyingforapatent专利andcompetingwithfivefinalteamsinfrontoftheUnitedNationsfor﹩1million. Despitealloureffortsmanyindustryexpertsremainedunwillingtotakeusseriously.Butasoftenhappensinbusinessthesamecharacteristicswewereignoredforwereinrealityourbiggestcompetitiveadvantages.Ouragegaveusthestrengthtobouncebackfromfailureandourbackgroundasenvironmentalscientistsratherthanbusinesswomenhelpedusfindnewmarketingopportunities.Forevery10farmerswhoclaimednobodywouldeverwanttofeedtheircowsseaweedwefoundonewhowasinterested.Forevery15cosmeticsproducerswhorefusedtoanswerourcoldcallswestucktotheonewithaninterestingideaforseaweedlotion. Overthecourseofourearlybusinessdevelopmenteffortswehavehadaccesstoawealthofresourcesprogramsandindividualswhoworkconstantlytohelpussucceed.Bystayingfocusedonbringingourideastolightourteamhasdemonstratedthatentrepreneurship创业isexactlytherightplaceforthehopeful. 1Whatwasthemajorcausefortheirdifficultyinstartingbusiness? A.Theyarewomen. B.Theywereyoung. C.Theylackedexperience. D.Theysufferedprejudice. 2Whatdidtheydotomaketheirbusinesssuccessfulaccordingtothepassage? A.Theyexpandedtheirseaweedfarms. B.Theyexperimentedonseaweedspecies. C.Theygottheirproductofficiallyrecognized. D.TheyconsultedtheUnitedNations. 3Whatisthethirdparagraphmainlyabout? A.Howtheybenefitedfromtheirweaknesses. B.Howtheygotothersinterestedinseaweed. C.Howtheymadethemselvesmorecompetitive. D.Howtheyapproachedpotentialcustomers. 4Whatisthefollowingcanbebestdescribethethreewomen? A.Naiveandsimple﹣minded. B.Ambitiousandself﹣centered. C.Adventurousandpersistent. D.Stubbornandcourageous.
父亲使我牢记努力工作的价值.impress…on
某同学根据一组xy的样本数据求出线性回归方程＝x+和相关系数r下列说法正确的是
I'msittinginmykitcheninLondontryingtofigureoutatextmessagefrommybrother.HelivesinourhomecountryofGermany.WespeakGermantoeachotheralanguagethat'srichinstrangewordsbutI'veneverheardthisonebeforefremdschämen. Theexperiencegetsmetoconsidercanweloseourmotherlanguage?Mostimmigrants移民knowwhatit'sliketobenotasgoodattheirmotherlanguageasbefore.Theprocessseemsobviousthelongeryouareawaythemoreyourlanguagesuffers.Butit'snotquitesostraightforward.Itturnsoutthathowlongyou'vebeenawaydoesn'talwaysmatter.Socializingwithothernativespeakersabroadcanworsenyourownnativeskills.Andemotionalfactorsliketrauma精神创伤canbethebiggestfactorofall. Inchildrenthephenomenonoflanguageattrition语言磨蚀issomewhateasiertoexplainsincetheirbrainsaregenerallymoreflexibleandadaptable.Untiltheageofabout12aperson'slanguageskillsarerelativelyeasytochange.Studiesoninternationaladoptershavefoundthatevennine﹣year﹣oldscanalmostcompletelyforgettheirfirstlanguagewhentheyareremovedfromtheircountryofbirth. Butinadultsthefirstlanguageisunlikelytodisappearentirelyexceptinextremecircumstances.ForexampleMonikaSchmidanalyzedtheGermanofelderlyGerman﹣Jewishwartimerefugees难民intheUKandtheUS.Themainfactorthatinfluencedtheirlanguageskillswasn'thowlongtheyhadbeenabroadorhowoldtheywerewhentheyleft.Itwashowmuchtraumatheyhadexperiencedasvictims.ThosewholeftGermanyintheearlydaysofNazioccupationbeforetheworstviolencetendedtospeakbetterGerman﹣despitehavingbeenabroadthelongest.ThosewholeftlatertendedtospeakGermanwithdifficultyornotatall. ItseemedveryclearlyaresultofthistraumasaysSchmid.EventhoughGermanwasthelanguageofchildhoodhomeandfamilyitwasalsothelanguageofpainfulmemories.Themosttraumatizedrefugeeshadheldthemback.AsoneofthemsaidIfeelthatGermanybetrayedme.AmericaismycountryandEnglishismylanguage. 1Whatdoesthefirstparagraphserveas? A.Acomment B.Abackground C.Anexplanation D.Anintroduction 2Whatdoparagraph4and5mainlytalkabout? A.Howtwolanguagescoexist B.Thewaytodealwithadult'strauma C.Thereasonsbehindadult'slanguageattrition. D.Whethertraumaleadstoadult'slanguageattrition. 3Whydoestraumacauseaperson'smotherlanguagetodisappear? A.Becausehecan'trememberhismotherlanguage. B.Becausehisabilitytocommunicateisaffected. C.Becausehiscountryisfarfromhim. D.Becausehechoosestoescapefrombadexperiences. 4Whatisthebesttitleforthepassage? A.Wheredoesyournativelanguagecomefrom? B.Willyouloseyournativelanguage? C.Howdoestraumaaffectyourfirstlanguage? D.Howfarareyoufromyourmothertongue
Whatmakesagoodapology?Whatistherightwaytosaywe'resorrythatdoesn'tmerelyrelieveourguiltorgetusoutofhotwaterbutbestservesthepersonwehurt?Thereismoretosayingsorrythanjustsayingsorry.1Theyincludeexpressingregretexplainingwhatwentwrongacknowledgingresponsibilityofferingtorepairthesituationandrequestingforgiveness. Thatmayseemlikealottorememberbutacknowledgementofresponsibilityturnedouttobethemostimportantpiece.Ofcoursenotalltheruinedsituationsarecreatedequal.2Hereareafewkeytips. Haveperfecttiming.Didyoutotallyruinthesituation?Alittlecool﹣offtimecouldhelp.3.Butiftheotherpartyisangryatyourwrongdoingitmaybemoreeffectivetowaitbecausetheirangermaypreventthemfrombeingreceptivetoanapology.Waitingcanhelpyoutoo.Thebesttimetoapologizeiswhenonefeelsreadytosincerelyapologize. 4Expertsagreethatface﹣to﹣faceapologiesbeatphoned﹣ine﹣mailedorhandwrittenones.Facialexpressionsgesturesandthetoneofvoicehaveallbeenshowntobeimportantchannelsthatconveysincerity.AnyonecantypeIfeelreallyashamedbutifyousayitliveit'sobviouswhetherornotyoumeanit. Explaindon'texcuse.Becauseadmittingtobeingwrongispainfulandcanmakepeopleworriedthatthey'reabadpersontheyoftenwaterdowntheirapologywithexcuses.ExamplesincludeIcertainlyapologizeifIoffendedanyoneandI'msorrybutyoustartedit.Thatsortofapologyhasanameanon﹣apology.Itusestheformofanapologybutfollowsitupbyshifting﹣responsibilitytotheoffendedpersonImplyingheorsheistoosensitive.5Evenifyoudidsomethingcomparablylessimportantlikebeinglateallthetimeit'salwayskeytorememberthatwhileyou'retheoneapologizingit'snotaboutyouit'saboutthepersonyouhurtandwhattheyneednow. A.Letyourbodydothetalking. B.Thereareseveraltypesofapologies. C.Getreadytochangeyourfacialexpressions. D.SometimesanImmediateapologyiscalledfor. E.Don'timplythattheotherpersoniswrongtofeelupsetorangry. F.Infactastudyfoundthateffectiveapologieshavefivecomponents. G.Soyoumightneedtofine﹣tuneyourapologydependingonthecircumstances.
如图抛物线y=ax2+bx+c与x轴交于AB两点与y轴交于C点且A10C03抛物线的对称轴为x=-11求抛物线的解析式2在该抛物线的对称轴上是否存在点M使得M到AC距离之和最小若存在求出点M的坐标若不存在请说明理由3该抛物线在第二象限的图象上是否存在一点P使四边形BOCP的面积最大若存在求出点P的坐标若不存在请说明理由4EF分别在抛物线和x轴上以EFBC为顶点的四边形为平行四边形．
Look！Thereissomething漂浮ontheriver
HomestayinSydneyAustralia 1Fourpersonswrotethesepassagessoasto. A.lookforsuitableroommates B.searchforhomestayinformation C.bookasuitableroominSydney D.advertiseroomsforhomestay 2OnepersonwholivesinJohn'sapartment. A.cansmokeintheapartment B.canuseJohn'swashingmachinetowashclothes C.hastowalkalongwaytogettothesportsfield D.isprovidedwithbreakfastandlunchonweekdays 3IfPeterwantstofindahomestayroomnearSydneyUniversityheshouldsendanemailto. A.markalarms@optusnet.com.au B.mineanny@hotmail.com C.cliqi9239@hotmail.com D.ainsleygilkes@yahoo.com.au
ManychildrendreamofbecomingmanagerswhentheygrowupbutveryfewstartasearlyasJoseAdolfoQuisocalaCondoriaPeruvian秘鲁boywhostartedachildren'ssavingsbankwhenhewasonly7yearsold.Todayhisbankhasbeen1toserveover2000clients客户. Sixyearsagohe2thatmanyofhisfriendswerespendingtheirmoneyonsweetsandtoys3savingitformoremeaningfulpurchases.Despitehisyoungagehe4thatsavingmoneyandaccessingthe5systemweretwowaysthatadultssolvedmanyoftheirmoneyproblemssohedecidedtomakethem6tokidsaswell.Hethenstarted7waysthatchildrencouldmakemoneywithoutthehelpoftheirparentsandrecyclingseemedlikethe8answer.Butwhenhecameupwithhisideaforachildren'sbanktohisteachershewastoldthata7﹣year﹣oldcouldn'tdealwithsuchan9.Butfinallyhe10themallwrong. AtthebeginningmyteachersthoughtIwascrazyJoserecalls.LuckilyIhadthe11oftheschoolheadmasterwithwhosehelphe12abankwherechildrencouldbecomeclientsbyturninginatleast5kilogramsof13wasteandwererequiredtosaveatleastoneotherkilogramofwasteeverymonth.Theywouldthensetasavings14andcouldonlygetmoneyfromtheir15whentheyreachedit. Between2012and2013hisbank16onetonofwasteandserved200childrenattheschool.Itwasareal17drawingalotofattentionandhe18co﹣workedwithalargebanktomakethiskindof19accessibletomorechildren. Forhisachievementshehasreceivedseveralhonoraryawardsforhelpingkidswiththeir20ofmoney. 1A.expanded B.founded C.predicted D.recommended 2A.admitted B.noticed C.doubted D.supposed 3A.asfor B.dueto C.insteadof D.incaseof 4A.suspected B.insisted C.decided D.understood 5A.social B.educational C.emotional D.financial 6A.available B.attractive C.amazing D.important 7A.puttingup B.thinkingof C.turningdown D.callingfor 8A.practical B.merciful C.fluent D.curious 9A.attitude B.honor C.story D.project 10A.felt B.demanded C.imagined D.proved 11A.attack B.injury C.support D.refusal 12A.setup B.calledup C.broughtup D.tookup 13A.recyclable B.useless C.precious D.harmful 14A.trade B.goal C.course D.limit 15A.school B.parents C.accounts D.materials 16A.selected B.removed C.explored D.collected 17A.matter B.hit C.burst D.campaign 18A.again B.just C.even D.still 19A.wastes B.plans C.services D.rules 20A.appointment B.management C.argument D.judgment
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