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小聪家为了取暖，每天需要给房间供热4.2×107J．若流进房间敏热器的水温是60℃，流出的水温是56℃，不考虑热损失则每天需要 kg的水流经散热器，[水的比热容为4.2×103J/（kg•℃），...
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知道水的比热容是4.2×103J/kg·℃想估算一下自己家每天烧水做饭需要的热量于是记录了家每天烧水
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冬天要给-10℃房间供热取暖消耗500Ｗ的功率给房间供热采用可逆热泵循环电热器两种供热方式哪种供热方
前者
两者相等
后者
没法比较
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太阳能热水器接受到的太阳光的辐射热可达1.05×107J.如果这些热量被质量为50kg的水全部吸收这
沼气利用在当前农村能源开发建设生态农业的过程中其地位和作用日显重要1沼气池建设国家标准的技术参数中规
为了取暖每天需要给房间供热4.2×107J..若流进房间散热器的水温是60℃流出的水温是56℃则每天
酒精的热值是3×107J/kg若要获得9×107J.的热量至少需要燃烧_______kg的酒精
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先化简再求值÷﹣1其中x＝．
某八年级计划用360元购买笔记本奖励优秀学生在购买时发现每本笔记本可以打九折结果买得的笔记本比打折前多10本． 1请利用分式方程求出每本笔记本的原来标价 2恰逢文具店周年志庆每本笔记本可以按原价打8折这样该校最多可购入多少本笔记本
从﹣123﹣6这四个数中任选两数分别记作mn那么点mn在函数y＝图象上的概率是．
某商场用36万元购进AB两种商品销售完后共获利6万元其进价和售价如下表 1该商场购进AB两种商品各多少件 2商场第二次以原进价购进AB两种商品．购进B种商品的件数不变而购进A种商品的件数是第一次的2倍A种商品按原售价出售而B种商品打折销售．若两种商品销售完毕要使第二次经营活动获利不少于81600元B种商品最低售价为每件多少元
某农户承包荒山种植某产品种蜜柚．已知该蜜柚的成本价为8元/千克投入市场销售时调查市场行情发现该蜜柚销售不会亏本且每天销量y千克与销售单价x元/千克之间的函数关系如图所示． 1求y与x的函数关系式并写出x的取值范围 2当该品种蜜柚定价为多少时每天销售获得的利润最大最大利润是多少
关于x的一元二次方程ax2+2x+c＝0a≠0有两个相等的实数根写出一组满足条件的实数ac的值a＝c＝．
已知抛物线y＝x2+bx+c经过A10B02两点顶点为D． 1求抛物线的解析式 2将△OAB绕点A顺时针旋转90°后点B落到点C的位置将抛物线沿y轴平移后经过点C求平移后所得图象的函数关系式．
如图矩形ABCD中点E是边AD的中点FE交对角线AC于点F若△AFE的面积 为2则△BCF的面积等于
解方程＝﹣3．
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如图△ABC是⊙O的内接正三角形图中阴影部分的面积是12π则⊙O的半径为．
如图四边形ABCD是矩形AB＝6BC＝8点P从A出发在线段AD上以1个单位/秒向点D运动点Q同时从点C出发以1个单位/秒的速度向点A运动当点P到达点D时点Q也随之停止运动． 1设△APQ的面积为S点P的运行时间为t求S与t的函数关系式 2t取几时S的值最大最大值是多少 3当t为何值时△APQ是等腰三角形
有4张卡片正面分别写上1234它们的背面都相同．现将它们背面朝上先从中任意摸出一张卡片不放回再任意摸出一张． 1请用树状图或列表法表示出所有可能的结果． 2求摸出的两张卡片上的数之和大于5的概率．
DutchdesignerDaanRoosegaardehasspentmuchofhistimeseekingartisticsolutions解决方案tosolveourenvironmentalproblems.HispastprojectsincludeBioluminescent生物发光TreestolightstreetsaSmog﹣FreeTowertocleanBeijing'spollutedair.andGatesofLight.whichusestheheadlampsofpassingcarstolightupthe60floodgatesoftheAfsluitdijkamajordamintheNetherlands.Nowheishopingtousehisskillstosolveapressingglobalproblem﹣spacejunk! Scientistsguessthatthereareover500000bitsoflargerubbish.TodealwiththeproblemRoosegaardeintendstoachievehisgoalbyeducatingthepublicabouttheneedofthesituationandcomingupwithpossiblesolutions.Theplan.calledtheSpaceWasteLab.startedinOctober2018withalaser激光showintheNetherlands.TheuniqueoutdoorartworkofLEDsusedreal﹣timetrackinginformationtopointatpiecesofspacejunkfloatingataltitudesof200to20000kilometers.Theexperiencewasdesignedtomakethepublicknowmoreabouthowmuchspacejunkthereare. Tofindasolutionthedesignerhasbeenthinkingwithexperts.OneoftheprojectsbeingconsideredisShootingStarswhichattemptstoreintroducethetrashtotheatmosphereinacontrolledway.Uponreentry.thewastewouldburnintheatmospherelikeashootingstar.Roosegaardeenvisagesthatifsuccessful.burningspacetrashcouldsomedayreplacefireworksatlargepublicevents! InSeptember2018.theRemoveDEBRISsatellitesuccessfullysentanettocatchatargetwhileorbitingatanaltitudeofabout300kilometers190miles.Sometimethisyear.thecapsulewillsetfreeaharpoonthathasbeendesignedtoremovespacetrash.AttheendofitstaskRemoveDEBRISwillletgoasailtobringthesatelliteitself.and.hopefullysometrashbackintotheatmosphere.whereitwillburnup. 1WhatcanweinferaboutDaanRoosegaarde? A.Heistooaggressivetoputforwardgoodplans. B.Heiscreativeinsolvingenvironmentalproblems. C.Heisfondofspendingallofhistimeseekingartskills. D.Heissensitivetoartreflectedinenvironmentalprojects. 2WhywasalasershowheldinOctober2018? A.Toconfirmreal﹣timeinformationaboutspacetrash. B.ToshowthegreatbeautyofLEDtocommonpeople. C.Toraisepublicawarenessoftheamountofspacetrash. D.Toinspirepeopletoconsiderthesolutiontospacetrash. 3Whatdoestheunderlinedwordenvisageinparagraph3probablymean? A.Suspect. B.Demand. C.Advise. D.Imagine. 4Whatisthefunctionofasail? A.Bringingthesatellitetoatmospheretoburn. B.Keepingtrashtravelingalongitsownorbit. C.Takingthesatelliteawayfromatmosphere. D.Removingspacetrashoutofthecapsule.
如图点A点B分别在反比例函数y＝和y＝的图象上且AB∥x轴则△OAB的面积等于．
VolunteersarevitallyimportantforMelbourne'stourism.TheyprovideinformationonMelbourneforaroundtwomillionvisitorseachyear.TheirloveandknowledgeofthecityaddtoMelbourne'sreputationasafriendlywelcomingandculturallyvibrantcity.Ifyouwouldliketoreceiveanemailadvisingyouonthenextrecruitment招募sessionpleaseemailtourism@melbourne.vic.gov.au.TheCityofMelbourne'stourismbranchgenerallyconductstwovolunteerrecruitmentintakeseachyearforthefollowingtourismprograms*CityAmbassadors*MelbourneVisitorBoothatBourkeStreetMall*MelbourneVisitorCentreatFederationSquare*MelbourneGreeterServicePlacesarelimitedandpotentialvolunteersmustparticipateinaselectionprocessbasedonthefollowingcriteria.Volunteersmustbe*passionateaboutMelbourne*customerservicefocused*familiarwithcomputer*availableforonefour﹣hourshift轮班eithermorningorafternooneveryfortnightforaminimumofoneyear*teamplayerswholovemeetingpeople*abletodemonstrateacommitmenttotheCityofMelbourne'svaluesMoreinformationTofindoutmoreaboutbecomingavolunteercontactusonlineorphonetheCityofMelbourne'sVolunteerProjectOfficerTourismMelbourneon0396589658.ForothervolunteeringopportunitiesseenationalvolunteerrecruitmentwebsiteGoVolunteer.1WhichofthefollowingisNOToneofthequalificationstobeavolunteer?A.Beingwillingtocooperate.B.Havingcomputerskills.C.Beingabletodoshiftworkeverynightforayear.D.HavingpassionforMelbourne.2Howcanyougetothervolunteeringchances?A.Byemailingtourism@melbourne.vie.gov.au.B.Byseeingnationalvolunteerrecruitmentwebsite.C.ByphoningtheCityofMelbourne'sVolunteerProjectOfficer.D.BycontactingTourismMelbourneonline.3Whereisthetextmostprobablytakenfrom?A.Agovernmentwebsite.B.Aradioreport.C.Abookreview.D.Ageographytextbook.4Whatmaybethebesttitleforthetext?A.GuidetoTouringinMelbourneB.WelcometotheCityofMelbourne!C.DoesVolunteeringPayBack?D.TourismVolunteerProgram!
该校22名男子足球队队员的年龄分布情况如下表 则这些队员年龄的平均数和中位数分别是
如图由几个相同的小正方体搭成的一个几何体它的主视图为
Pictureaniceberg冰山.You'llprobablyimaginesomethingwhiteassnowrisingupoutofabluesea.Buticebergscanbeallsortsofshades.Theycanbefromafrostybluetoanattractivegreen. Researchersandsailorshaveobservedemerald翠绿色icebergsforyears.Alargepieceoficemast﹣highandgreenasemeraldevenappearsinSamuelTaylorColeridge's1834poem.Buttheyhaven'tfoundoutexactlywhytheseicebergslookthewaytheydo. AnewpaperledbyStephenWarrenwaspublished.Itallhastodowithwhaticebergsaremadeoutof.Icebergsbreakoffglaciers冰川oriceshelveswhichhappensmainlyaroundAntarcticaandGreenland.Theybegintheirlivesassnowfallthataccumulatesovertime.So.icebergscontainairpocketswiththeformofbubblesthatspreadlight.Withsomeexceptionsandrarelinesglaciericetendstolookbluishwhite. AtfirstWarrenguessedthatthegreenwasaproductofmeltcarbon.Anditcamefromrottingplantsorseaanimals.Butsamples样本didn'tproveit.AnotherideastartedtotakeshapeaftertheyhadfoundahighconcentrationofironinasampleofseaicefromtheAmeryIceShelf. Whenglaciersrubacrosslandtheyproducewhat'sknownasglacierflour.Itisaproductofbedrockbeinggroundclownbythemovingmass.Asglaciersmoveawaytheseremainsareusuallywashedoutintowater.inparticlessometimestoosmalltobenoticeabletoyoureyes.Butonland.soilandrockscontainironoxidesthatoftenhaverosycolors.likeredsyellowsandbrowns﹣andsincetheseaicecontained500timesmoreironthantheglaciericeWarrenwonderedwhethertheremainswereresponsibleforicebergstakingonagreenappearance. Hedoesn'tknowforsure.He'shopingtosecuremoneysothathecanreturntotheareaandstudytheicebergsthemselves. 1WhyisSamuelTaylorColeridge'spoemmentionedinthetext? A.Ittellswhyicebergslookthewaytheydo. B.Itdescribesvividlywhaticebergsarelike. C.Itsayscausesoftheappearanceoficebergs. D.Itprovestheexistenceofcolorfulicebergs. 2WhatcanweknowaboutStephenWarren'spaper? A.Itdrawsonresearchers'andsailors'views. B.Itistherecordofthemovementoficebergs. C.Ittalksabouthowicebergscomeintobeing. D.Itisacollectionofvarioussocialphenomena. 3Whatdoestheunderlinedworditinparagraph4referto? A.Asampleofseaice. B.Warren'sfirstguess. C.Warren'sideaoniron. D.Aproductofmeltcarbon. 4Whatisparagraph5mainlyabout? A.Thepossiblereasonwhyicebergslookgreen. B.Wheremostoficebergseventuallydisappear. C.Howicebergstakeinthecolorsfromglaciers. D.Thewayinwhichicebergsbreaksoffglaciers.
如图在△ABC中ADBE分别是边BCAC上的中线AB＝AC＝5cos∠C＝那么GE＝．
如图在2×2的网格中以顶点O为圆心以2个单位长度为半径作圆弧交图中格线于点A则tan∠ABO的值为．
因式分解a3﹣9a＝．
阅读在平面直角坐标系内对于点Pxy我们把Q﹣y+1x+3叫做它的伴随点．如点21的伴随点为﹣1+12+3即05． 1若点M的伴随点坐标为﹣53则点M的坐标为 2若点A1ab的伴随点为A2A2的伴随点为A3A3的伴随点为A4…以此类推将所有点记为An． ①若点A104的坐标为3﹣1则点A1的坐标为 ②点An有没有可能始终在y轴的右侧若可能请分别求出ab的取值范围若不可能请说明理由 ③设直角坐标系的原点为O若点An始终在一个半径为3的圆上请直接写出OAn的最小值．
将数12000000科学记数法表示为．
如图△ABC中AB＝10AC＝7AD是角平分线CM⊥AD于M且N是BC的中点则MN＝．
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AfewyearsagomywifeandItookatriptoCostaRica.Uponarrivalwe1acarandheadedouttoourfirstdestinationwhichwasafewhoursaway.Ihada2soIfiguredI'dbeingreatcondition.About20minutesintothedriveIfoundmyselfpractically3intheunmarkedstreetsanddirtyroads.Upset.IturnedtoSiriavirtual虚拟的assistantinmyphoneforhelp. Itypedthe4toourdestinationinmyphoneandinstantlySirihad5thebestroute路线togetthereandwewereonourway. Theonly6wasthatthingsdidn'talwaysgothewayIthoughttheywould.Withthestreetsnotbeingwell7Iwouldsometimesmissaturnandheadinthe8direction.LuckilySirinevergot9withme.AnytimeImissedaturnSiriwouldsimply10andsayRecalculatingroute.11route.AndwithinafewsecondsSiriwouldhaveanewroute12togetustoourdestination. SometimesthenewroutemeantIhadto13totherightturnandsometimesshefoundadifferentroutethattookmynewlocationinto14Eventuallywemadeittoourhotel15andenjoyedsomebeautifulsceneryalongtheway. Mostpeoplemakethe16ofthinkingthatsuccessandhappinesscomefromsomeonesettingagoalandthen17straighttowardsit.The18isthatthereisnostraightpathtosuccess.Thereisn'teventhe19path.Therearemanypathsthatcangetyoutoyourgoals.Youjusthavetobe20torecalculateyourroutewhenyoumissaturnorthereissomethinginyourway. 1A.produced B.repaired C.rented D.purchased 2A.car B.phone C.compass D.map 3A.absorbed B.lost C.experienced D.free 4A.address B.approach C.receipt D.schedule 5A.polished B.discovered C.opened D.managed 6A.fear B.difference C.sympathy D.problem 7A.marked B.paved C.arranged D.expanded 8A.illegal B.new C.wrong D.potential 9A.generous B.mad C.concerned D.cautious 10A.breakdown B.cutin C.getup D.goaway 11AAbandoning B.Cancelling C.Reaching D.Changing 12A.checked B.updated C.adjusted D.planned 13A.point B.lead C.return D.apply 14A.order B.direction C.account D.place 15A.safely B.frequently C.hungrily D.gradually 16A.mistake B.excuse C.accident D.trouble 17A.accumulating B.withdrawing C.marching D.fleeing 18A.answer B.truth C.condition D.privilege 19A.first B.suitable C.accurate D.only 20A.willing B.proud C.anxious D.ambitious
今年5月份十八中九年级学生参加了中考体育模拟考试为了了解该校九年级1班同学的中考体育情况对全班学生的中考体育成绩进行了统计并绘制以下不完整的频数分布表和扇形统计图根据图表中的信息解答下列问题 1求全班学生人数和m的值． 2求扇形统计图中的E对应的扇形圆心角的度数 3该班中考体育成绩满分共有3人其中男生2人女生1人现需从这3人中随机选取2人到八年级进行经验交流请用“列表法”或“画树状图法”求出恰好选到一男一女的概率．
如图数轴上表示的是某个函数自变量的取值范围则这个函数解析式为
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