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小轩同学在“研究杠杆的平衡条件”的实验中，他将杠杆挂在支架上，结果发现杠杆左端向下倾斜． （1）若要使杠杆在水平位置平衡，需把杠杆右端的平衡螺母向 移动（选填“左”或“右”）； （2）调杠杆...
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根据研究杠杆平衡条件的实验某同学在调节杠杆水平位置平衡时发现杠杆的右端翘起如图10所示他可以调节右端
小森在探究杠杆平衡条件的实验中1把杠杆挂在支架上观察到枉杆左端下沉当他去调节螺母时发现两侧螺母已丢失
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
小明在研究杠杆平衡条件的实验中1把杠杆挂在支架上观察到杠杆左端下沉当他去调节螺母时发现两侧螺母已丢失
探究杠杆的平衡条件实验中采用的器材有杠杆支架弹簧测力计刻度尺以及重0.5N的钩码若干1小徐把杠杆中点
根据研究杠杆平衡条件的实验某同学在调节杠杆水平位置平衡时发现杠杆的右端翘起如图所示他可以调节右端的螺
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
在探究杠杆平衡条件的实验中1某同学将杠杆悬挂起来发现杠杆的右端低左端高他应该将杠杆两端的平衡螺母向调
在探究杠杆平衡条件的实验中1某同学将杠杆悬挂起来发现杠杆的右端低左端高他应该将杠杆两端的平衡螺母向调
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
小磊同学在研究杠杆的平衡条件的实验中他将杠杆挂在支架上结果发现杠杆左端向下倾斜． 1若要使杠杆在
小磊同学在探究杠杆的平衡条件的实验中他将杠杆挂在支架上结果发现杠杆左端向下倾斜新课标xkb1.com
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
小磊同学在研究杠杆的平衡条件的实验中他将杠杆挂在支架上结果发现杠杆左端向下倾斜1若要使杠杆在水平位置
根据研究杠杆平衡条件的实验某同学在调节杠杆水平位置平衡时发现杠杆的右端翘起如图所示他可以调节右端的螺
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架刻度尺细线质量相同的钩码若干1将杠杆装在支架上发现
在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架刻度尺细线质量相同的钩码若干1将杠杆装在支架上发现
如图甲所示小明在探究杠杆的平衡条件实验中所用的实验器材有杠杆支架弹簧测力计刻度尺细线和质量相同的钩码
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某种品牌的产品共5件其中有2件次品小王从中任取两件则小王取到都是次品的概率是
顺次连接等腰梯形四边中点得到一个四边形再顺次连接所得四边形四边的中点得到的图形是
在直角坐标系中直线y＝x+m与双曲线在第一象限交于点A在第三象限交于点D与x轴交于点CAB⊥x轴垂足为B且S△AOB＝1 1求m的值2求△ABC的面积3求AD的长．
阅读下面材料小聪遇到这样一个有关角平分线的问题如图1在△ABC中∠A＝2∠BCD平分∠ACBAD＝2.4AC＝3.6求BC得长．小聪思考因为CD平分∠ACB所以可在BC边上取点E使EC＝AC连接DE．这样很容易得到△DEC≌△DAC经过推理能使问题得到解决如图2．请完成1求证△BDE是等腰三角形2求BC的长为多少3参考小聪思考问题的方法解决问题如图3已知△ABC中AB＝AC∠A＝20°BD平分∠ABCBD＝BC＝求AD的长．
ThisIsWhyTrafficLightsAreRedYellowandGreen Everwonderedwhybluedoesn'tmeangoandbrownmeanstop?1 Theideathatredmeansstopandgreenmeansgohasimpactedourlivesinmorewaysthanjusttrafficsignals.Wehavebeentaughtfromayoungagethatthecolorredmeansdanger. 2.Butwhywerethoseparticularcolorschosenfortrafficlightsinthefirstplace?Forsomethingwehavetolookateverydaywhycouldn'ttheyhavebeenprettiercolorslikemagenta紫红andturquoise天蓝色? It'simportanttoknowthatbeforethereweretrafficlightsforcarsthereweretrafficsignalsfortrains.Atfirstrailroadcompaniesusedredtomeanstopwhitetomeangoandgreentomeancaution.Asyoucouldimaginetrainconductorsranintoafewproblemswiththecolorwhitemeaninggo﹣3withtrainconductorsthinkingtheywereallclearwhentheyreallyweren't.Railwaycompanieseventuallymovedtothecolorgreenmeaninggoandit'sbeenthatwayeversince. Asfarasredgoesthat'salwaysbeenacolorthatindicateddangerlongbeforecarswereevenaround.Redisthecolorwiththelongestwavelength.4.Thecoloryellowwasusedtocautiondriversbecauseithasaslightlyshorterwavelengththanredbutnotasshortasgreen. 5.Employthesedrivingrulesfirstandknowthattrafficlightshavecertainlycomealongway. A.Andthecolorgreenmeansit'sOKtomoveforward B.Turnsoutthere'saperfectlygoodexplanationforit C.Itcanbeseenfromagreaterdistancethanothercolors D.brightwhitecouldeasilybeseenfromadistancebyus E.brightwhitecouldeasilybemistakenforstarsatnight F.Whydon'tweusebluetomeangoandbrownmeanstop G.Sodon'tgetmadnexttimeyou'reimpatientlywaitingatatrafficlight
一个口袋内装有大小相等的1个白球和已编有不同号码的3个黑球从中摸出2个球． 1共多少种不同的结果 2摸出2个黑球有多少种不同的结果 3摸出2个黑球的概率是多少
InthenineteenthcenturyoneofAmerica'sgreatestwritersWaltWhitmanhelpedpeoplelearntovaluepoetry.Whitmancreatedanewkindofpoetry. WaltWhitmanwasbornineighteennineteeninNewYorkCity.DuringhislonglifehewatchedAmericagrowfromayoungnationtothestrongestindustrialpowerintheworld.AsayoungmanWhitmanworkedasaschoolteacheraprinterandanewspaperreporter.Hewasthirty﹣sixyearsoldwhenhepublishedhisfirstbookofpoetryineighteenfifty﹣five.HecalleditLeavesofGrass.Ithadonlytwelvepoems.Thepoemsarewritteninfreeverse.Thelinesdonotfollowanysetform.Somelinesareshort.Somearelong.Thewordsattheendofeachlinedonothaveasimilarsound.Theydonotrhyme. OneofAmerica'sgreatestthinkersandwritersimmediatelyrecognizedtheimportanceofLeavesofGrass.RalphWaldoEmersonpraisedWhitman'swork.Butmostotherpoetsandwriterssaidnothingandevendenouncedit.MostreadersalsorejectedWhitman'spoems.Thenewformofhispoetrysurprisedmanypeople.EvenhisownbrothertoldWhitmanthatheshouldstopwritingpoetry.ButWhitmanhadmanythingstosay.Andhecontinuedtosaythem.ReadersbegantounderstandthatAmericahadagreatnewpoeticvoice. WaltWhitman'spoemspraisetheUnitedStatesanditsdemocracy.ThepoetexpressedhisloveforAmericaanditspeopleinmanyways.ExpertstodaypraiseLeavesofGrassasamajorliterarywork.Ineighteenseventy﹣threeWaltWhitmansufferedastroke.HespentthelastyearsofhislifeinCamdenNewJersey.Whitmanwaspoorandweakduringthelastyearsofhislife.Hediedineighteenninety﹣two.SomecriticssayWaltWhitmanwasaspokesmanfordemocracy.Otherssayhewasnotaspokesmanforanything.Instead*theysimplycallhimagreatpoet. 1WhatcanweknowaboutWhitman? A.Hispoemshavethesamerhyme. B.HeisthefirstgreatpoetintheUSA. C.Hehelpedpeopletocreatenewpoems. D.Hispoemsshowhisloveforhiscountry. 2WhywasLeavesofGrassrefusedatfirst? A.Thepoemsarequiteshort. B.Theformofpoetryisspecial. C.Whitmanwasn'tfamousthen. D.Thereareonly12poemsinit. 3WhatdoestheunderlinedworddenouncedinParagraph3mostprobablymean? A.Accused. B.Downloaded. C.Published. D.Translated. 4Whatcanbeasuitabletitleforthetext? A.WaltWhitman﹣aGreatSoldier B.WaltWhitman﹣anUnfortunatePoet C.WaltWhitmanandLeavesofGrass D.TheFirstandGreatestPoetinAmerica
如图▱ABCD的周长为16cmAC与BD相交于点OOE⊥AC交AD于E则△DCE的周长为
已知如图矩形AOBC以O为坐标原点OBOA分别在x轴y轴上点A坐标为03∠OAB＝60°以AB为轴对折后使C点落在D点处求D点坐标．
如图矩形ABCD中CE⊥BD于E若∠DCE＝3∠ECB则∠ACE＝度．
从A地到C地可供选择的方案有走水路走陆路走空中．从A地到B地有2条水路2条陆路从B地到C地有3条陆路可供选择走空中从A地不经B地直接到C地．则从A地到C地可供选择的方案有
如图圆弧形拱桥的跨径AB＝12米拱高CD＝4米则拱桥的半径为米．
如图在△ABC中BC＝5cmBPCP分别是∠ABC和∠ACB的角平分线且PD∥ABPE∥AC则△PDE的周长是cm．
有如下四个结论 ①既是轴对称图形又是中心对称图形的四边形是菱形 ②一个多边形的所有内角中最多只有3个是锐角 ③正五边形的每一个内角都等于108° 其中正确结论的个数为
YesterdayIclearedupmyhouseandImeanreallyclearedupmyhouse.Theroomthatgavethemostresultswasmyhusband'soffice.ThereIfound:oneright﹣footedshoesize10helosttheotheronesomewhereasetofStarWarsvideosandtwosmallchinacatssomeonegavemelastbirthday.Icollectedthesefindsandtookthemdownstairsandlogged登录ontowww.eBay.com:theanswertoallourrubbish. WhatiseBay?Itaimstoprovideaglobaltradingplatformwherealmostanyonecantradealmostanything.TheideacamefromPierreOmidyar.BorninParisOmidyarmovedtoWashingtonwhenhewasstillachild.AtHighSchoolhebecameveryinterestedincomputerprogrammingandaftergraduatingfromTuftsUniversityin1988heworkedforthenextfewyearsasacomputerengineer.InhisfreetimehestartedeBayasakindofhobbyoriginallyofferingtheservicefreebywordofmouth.By1996therewassomuchtrafficonthesitethathehadtoupgrade升级andhebegancollectingfees.JoinedbyafriendPeterSkollandin1998byhisdynamicCEOMegWhitmanhehasneverlookedback.Eveninthegreatdot﹣comcrashesofthelate1990seBaywentfromstrengthtostrength.ItisnowoneofthetenmostvisitedonlineshoppingsitesontheInternet. Ifyouthinkaboutitit'saperfectInternetidea.Allyouhavetodoistakeane﹣photowriteadescriptionfilloutasalesformandyou'reinbusiness;theworldisyourmarketplace. SomeofthemorebizarregoodsupforofferhavebeenapieceofFrenchbreadpartiallyeatenbyJustinTimberlakeadvertisingspaceonaman'sheadandapairofusedfalseteeth. OneweeklaterIamproudofhavingacleanandtidyhomeand£110incash.Someoneevenboughttheshoe. 1WhydidtheauthorlogontoeBay? A.Tosellsomethings. B.Tobuyshoesforherhusband. C.Toexchangethingswithotherusers. D.Tosearchforthingsusedattheoffice. 2WhatcanweinferfromParagraph2abouteBay? A.Itaimstoprovideafreeservice. B.Itwastheideaofahighschoolboy. C.Ithasbecomemoreandmoresuccessful. D.Itfacedadifficultsituationinthelate1990s. 3TheunderlinedwordbizarreinParagraph4isclosestinmeaningto. A.popular B.unusual C.valuable D.unacceptable 4WhatdoestheauthorthinkofeBay? A.Sheissatisfiedwithit. B.Sheisworriedaboutit. C.Sheshowsnointerestinit. D.Shethinksitwastesalotofmoney.
甲乙丙丁四支足球队在世界杯预选赛中进球数分别为99x7若这组数据的众数与平均数恰好相等则这组数据的中位数是
如图O点在梯形ABCD的下底AB上且⨀O与梯形的上底及两腰都相切若AB＝5cmCD＝2cm则梯形ABCD的周长等于．
Thisweekwe'resharingourfavoriterecentreads.Tohelproundoutourrecommendationswealsotappedsomefolkswhoyou'veheardonCodeSwitchbefore﹣novelistsscholarspoetsandpodcasters. AllYouCanEverKnowbyNicoleChung ThebookisanextraordinaryhonestandsympatheticlookatadoptionraceinAmericaandfamiliesingeneral.It'salsosuchanengagingread.Istayedupwaytoolateonenightreadingitbecausethestoryjustpulledmein.AndI'verecommendedmanyofmyfriendstoreaditsoIcantalkaboutitwiththem.﹣JasmineGuilloryauthorofTheWeddingDateTheProposalandtheforthcomingbookTheWeddingPart. BecomingbyMichelleObama It'sadeeply﹣movingcomingofagestoryofMichelleObamainherearlylife.Therearesuchmovinganecdotesabouthowthisfamilyjustinvestedeverythinginthepossibilityofgivingtheirchildrenabetterlife.It'snotasweetbookbutatthesametimeit'sdeeplyhopefulaboutthepossibilityofwhathappenswhenyouworkhardwhathappenswhenyoulovehard.﹣TayariJonesauthorofAnAmericanMarriageSilverSparrowandotherbooks. RageBecomesHer:ThePowerofWomen'sAngerbySorayaChemaly WhatreallyimpressedmeaboutthisbookisthisideathatwomenshouldbeallowedtoexpresstheirangerparticularlyinLatinAmericanfamiliesandcommunities.IjustthinkSorayagoesintothisincredibledetailcitingscientificstudiesanddifferentworksofliteraturethatreallyconveythenecessitytofemaleangernotonlyforthehealthofwomenbutforthehealthofequalityinsociety.﹣JeanGuerreroreporterwithKPBSandauthorofCrux:ACross﹣BorderMemoir. 1WhowroteTheWeddingDate? A.TayariJones B.JeanGuerrero C.JasmineGuillory D.SorayaChemaly 2Whichbooktellsabitterstorywithhope? A.Becoming B.AllYouCanEverKnow C.SilverSparrow D.Crux:ACross﹣BorderMemoir 3What'sthepurposeofthepassage? A.Tosellbooks. B.Tocommentonbooks. C.Tosharereviewsofbooks. D.Tocollectopinionsofbooks.
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. LastSundaywhileeatinginarestaurantInoticeabowlfullofdumplingsonthetablenexttomine.Theymusthavebeenleftbysomeone.Justthentheoldmanentered.JudgedfromhisclothesIbelievedshewaspoor.Hesawthedumplingsleftonthetable.Lookingshylyhesatdownandstartedeating.Theothersaroundlookedhimpuzzledbutsomeevenlaughed.Howeverafterfinishingthedumplingshewentuptothedonationboxesonthecounterputonehundredyuaninitandleftthatleftusallshockedandashamed.Weshouldn'tjudgebyapersonjustfromhisorherappearance.
如果实数a满足|a|＝3且a＜0那么a的值为
已知二次函数的图象如图所示那么此函数的解析式只可能是
如图△ABC是等边三角形点DE分别为边BCAC上的点且CD＝AE点F是BE和AD的交点BG⊥AD于G点已知∠BEC＝75°FG＝1则AB的长为
Thetonsofplasticwe'redumpingintheoceansisfindinganewhome﹣thestomachsofourbeautifulmarineanimals.YetanotherreminderofthisfactwashedashoreinEasternIndonesiathisweek.Alargeamountofwasteincludingdrinkingcupsandflip﹣flopswasfoundinthestomachofawhalethatdiedoffthecoastnearKapotaIsland. The9.5﹣metrespermwhale抹香鲸wasfoundbyrescuersfromtheWakatobiNationalPark. Thewhalehadswallowed5.9kilogramsofplasticwastecontaining115plasticcupsfourplasticbottles25plasticbagsandmorethan1000otherkindsofpiecesofplasticparkchiefHeriSantosotoldthereporter. AlthoughwehavenotbeenabletodeducethecauseofdeaththefactsthatweseearetrulyawfulsaidDwiSupraptiamarinespeciesconservationco﹣ordinatoratWWFIndonesia.Shesaiditwasnotpossibletodetermineiftheplastichadcausedthewhale'sdeathbecauseoftheanimal'sadvancedstateofdecay腐烂.Butthisisonlythelatest. FourAsiannations﹣IndonesiathePhilippinesVietnamandThailand﹣accountfor50%oftheplasticwasteintheoceansaccordingtoareportbyenvironmentalcampaignerOceanConservancyandtheMcKinseyCenterforBusinessandEnvironment.ThePhilippinesissecondtoIndonesiawhenitcomestoputtingawayplasticwasteintheoceansaccordingtoastudypublishedinthejournalScienceinJanuary.Ofthe3.2millionmismanagedwasteitproduceseveryyear1.29millionendsupintheocean. Areportreleasedearlierthisyearstatedthattheamountofplasticintheoceanislikelytoincrease. 1Whatcanweknowaboutthespermwhale? A.Itsstomachisthehomeofplasticwaste. B.Itdiedofswallowinglotsofplasticwaste. C.Itwasthefirstwhaletoeatplasticwaste. D.Ithadeatenmuchplasticwastebeforeitsdeath. 2Whichcanbestreplacetheunderlinedworddeduceinparagraph3? A.confirm B.cause C.approve D.contain 3Whichcountrydumpsthemostplasticwasteintotheoceans? A.Thailand B.Indonesia C.Vietnam D.Philippines 4What'sthemainideaofthepassage? A.Philippinesputsaway1.29milliontonsofplastic. B.AspermwhalewasfounddeadnearKapotaIsland. C.Muchdumpedplasticwastewasfoundinadeadwhale. D.Weshouldtakemeasurestoreducethewasteinwhales.
在同一直角坐标系中一次函数y＝kx﹣k与反比例函数y＝k≠0的图象大致是
某企业的年产值在两年内从1000万元增加到1210万元求平均每年增长的百分率．
计算
LikemanymilitarywivesIhadtostandthelongseparationsuntilmyhusbandretired.ThoughIsupportedhiminhischosencareerI1everymomentawayfromhim. To2ourseparationsIwroteletterseveryday.Imadeupdozensofsmall3forhimwhichIsecretlyputintohisbagsothathecould4themwhenhewasouttosea.Tothisdaythosenotesarestill5tous. 6in1996myhusbandretiredfromtheNavy.Buttheonlyjob7formyhusbandwassixandahalfhoursofdrivingawayinNorfolkVirginia. Wespenteightmonths8.Thatwasourhardestseparationperhapsbecausewehad9plannedtobeapartagain.He10toapplyforjobsintheareawherewehopedtolive.Weexpectedwewouldsoonbeabletobe11again. OnedayLouiecalledmewiththegood12.HefoundajobinsouthwestVirginia.Wewereexcited!Therewasonlyonesmall13.Louiewouldhavetoliveinacamper露营车whileourdaughtersandIlivedinalittlehouseanhourandahalfofdriving14.Mydaughterswere15enoughtotakecareofthemselves?SoIleftthemandstayedwithLouie. LouieandIspentseveral16weekstogether.OnemorningafterheleftforworkIsat17inthecampertryingtorememberanypossessionthatwasaspricelessasthe18westayedtogether.Icouldn't19asinglething.Thenallofusmovedintothatcamperandlivedthereforayear.Itwaspurejoy!I'velearnedthatthegreatest20IhaveisthetimeI'vespentwiththeonesIlove. 1A.spent B.enjoyed C.hated D.missed 2A.dealwith B.preparefor C.thinkof D.fightfor 3A.stories B.gifts C.letters D.notes 4A.receive B.discover C.consider D.write 5A.precious B.important C.strange D.necessary 6A.Once B.Again C.Soon D.Finally 7A.convenient B.common C.ready D.available 8A.easily B.apart C.normally D.happily 9A.already B.just C.never D.always 10A.continued B.afforded C.managed D.liked 11A.rich B.young C.close D.together 12A.news B.job C.chance D.skill 13A.shame B.mistake C.fault D.problem 14A.far B.distance C.away D.farther 15A.clever B.old C.strong D.beautiful 16A.long B.simple C.wonderful D.busy 17A.patiently B.alone C.sadly D.calmly 18A.plan B.promise C.time D.place 19A.dependon B.thinkof C.careabout D.focuson 20A.treasure B.happiness C.luck D.feeling
已知等腰三角形腰长为2cm面积为1cm2则这个等腰三角形的顶角为．
若sinα＝cos40°则锐角α＝．
三角形三边长为6810则这个三角形的面积是．
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