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国家大力推广光伏发电技术．如图所示为光伏发电技术的核心组件太阳能电池板的结构．据图回答下列问题： （1）图中标示的物质中含有金属材料的是 ．其含有的金属元素有 （填“元素符号”，一种即可...
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是一种将太阳辐射能通过光伏效应经光伏电池直接转换为电能的发电技术它向负荷直接提供直流电或经逆变器将直
光伏发电技术
风力发电技术
燃料电池发电技术
生物质能发电技术
以下不属于光伏发电系统的是
独立光伏发电系统
并网光伏发电系统
分布式光伏发电系统
集中式光伏发电系统
根据光伏发电系统接入配电网技术规定GB/T29319-2012光伏发电系统接入电网前应明确上网电量和
说到光伏发电人们往往会想到的是那些巨大的太阳能电池阵列年轻的朋友们也许会联想到美国电影变形金刚中那些
光伏发电系统分为等发电系统
带蓄电池的光伏发电系统
独立光伏发电系统
并网光伏发电系统
集中式大型并网光伏电站
分布式光伏发电系统
光伏发电系统中光伏组件串并后接入逆变器过程中应保证的光伏组件进入同一个逆变器
光伏发电系统按是否接入公共电网可分为
大型光伏发电系统
小型光伏发电系统
并网光伏发电系统
地面光伏发电系统
独立光伏发电系统
分布式光伏发电项目采用的光伏电池组件逆变器等设备必须采用经 批准的认证机构认证的产品符合相关接入电网
国家发改委
国家认监委
国家能源局
供电公司
光伏发电系统不包括
独立光伏发电系统
集中光伏发电系统
并网光伏发电系统
分布式光伏发电系统
由于光伏发电是在白天发电与的最大电力需求有很好的相关性因此光伏发电技术有广阔的应用前景
发电机
负荷
电网
用户
太阳能光伏发电系统的最核心的器件是
控制器
逆变器
光伏电池组件
蓄电池
按照光伏发电系统接入配电网技术规定GB/T29319-2012要求当光伏发电系统公共连接点频率突然升
分布式光伏发电项目采用的光伏电池组件逆变器等设备须采用经国 家认监委批准的认证机构认证的产品符合相关
是一种将风能通过风力发电机转换为电能的发电技术
光伏发电技术
风力发电技术
燃料电池发电技术
生物质能发电技术
按照光伏发电系统接入配电网技术规定GB/T29319-2012要求当光伏发电系统并网点电压突然降至为
根据光伏发电系统接入配电网技术规定GB/T29319-2012对于有升压站的光伏发电系统其并网点指
以下哪些不是关于光伏发电的国家标准
光伏发电站接入电力系统技术规定
光伏系统并网技术要求
光伏（PV）系统电网接口特性
光伏并网检测规定
具备独立发电能力的光伏发电最小单元被称为
光伏发电阵列
光伏发电系统
光伏发电单位
单元发电模块
光伏发电设备安装技术要求包括
安装前应制定光伏发电设备的专项施工方案
光伏组件采用螺栓固定
光伏组件之间的接线在组串前应进行光伏组件串的开路电压和短路电流的测试
汇流箱安装垂直度偏差应小于1.5mm
逆变器基础型钢其顶部应高出抹平地面10mm并有可靠的接地
根据光伏发电系统接入配电网技术规定GB/T29319-2012当光伏发电系统设计为不可逆并网方式时应
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现定义一种变换对于一个由有限个数组成的序列S0将其中的每个数换成该数在S0中出现的次数可得到一个新序列S1例如序列S042342通过变换可生成新序列S122122若S0可以为任意序列则下面的序列可作为S1的是
WhenChristopherColumbuslandedonthethenunnamedCostaRicain1502hesawmanyIndianswearinggoldearrings.Sohethoughtthelandmustberichingold.HenamedtheplaceCostaRicawhichmeansrichcoastinSpanish. ThoughlittlegoldwasfoundCostaRicatodayisindeedrichwithcoffeeandbananas.CoffeeisthemostimportantproductinCostaRicaandmostofitisexportedtoothercountrieslikeAmericaandWestGermany.Bananasarethecountry'ssecondmostimportantexport. CostaRicansalsogrowmanyothercropssuchasfruitscornandbeansfortheirownuse.CostaRicanslovecolorsandtheirhousesarepaintedinbrightcolors. EducationisveryimportanttotheCostaRicans.Almosteveryvillagehasaschoolandeducationisamustforchildrenbetweensevenandfourteenyearsofage.Boysandgirlsgotoseparateschools.ClassesbegininMarchandendinNovember.Theotherthreemonthsoftheyearareharvesttimeandthechildrenhavetohelptheirparentstopickcoffeebeans. 1What'sthemainideaofthefirstparagraph? A.HowColumbusfoundCostaRica. B.HowCostaRicagotitsname. C.WhattheCostaRicanswore. D.WhatlanguagetheCostaRicansspoke. 2TheCostaRicansmayNOTpainttheirhouses. A.pinkandred B.greyandblack C.blueandgreen D.yellowandorange 3InCostaRicaboysandgirlsbetweensevenandfourteen. A.mustgotoschool B.studyinthesameschool C.donothavetogotoschoolatall D.canchoosetostopschoolingatanytime 4FromDecembertoFebruaryschoolchildreninCostaRica. A.havelessonseveryday B.havetheirexaminations C.helptheirparentspickcoffeebeans D.helptheirparentsdecoratetheirhouses 5Thispassageismainlyabout. A.ChristopherColumbus B.CostaRica C.someproductsfromCostaRica D.theeducationofCostaRic
如图在正方形ABCD和正方形DEFG中点G在CD上DE＝2将正方形DEFG绕点D顺时针旋转60°得到正方形DE'F'G'此时点G'在AC上连接CE'则CE'+CG'＝．
下列因式分解正确的是
Somepeoplethinkthatsuccessisonlyforthosewithtalentorthosewhogrowupintherightfamilyandothersbelievethatsuccessmostlycomesdowntoluck.I'mnotgoingtosaylucktalentandcircumstancesdon'tcomeintoplaybecausetheydo.Somepeoplearebornintotherightfamilywhileothersarebornwithgreatintelligenceandthat'sjusttherealityofhowlifeis. Howevertosucceedinlifeonefirstneedstosetagoalandthengraduallymakeitmorepractical.Andinadditiontothatinordertogetreallygoodatsomethingoneneedstospendatleast10000hoursstudyingandpracticing.Tobecomegreatatcertainthingsit'llrequireevenmoretimetimethatmostpeoplewon'tputin. Thisisabigreasonwhymanysuccessfulpeopleadviseyoutodosomethingyoulove.Ifyoudon'tenjoywhatyoudoitisgoingtofeellikeunbearablepainandwilllikelymakeyouquitwellbeforeyoueverbecomegoodatit. Whenyouseepeopleexhibitingsomegreatskillsorhavingachievedgreatsuccessyouknowthattheyhaveputinahugepartoftheirlifetogetthereatahugecost.It'ssometimeseasytothinktheygotluckyortheywerebornwithsomeraretalentbutthinkingthatwaydoesyounogoodandthere'sahugechancethatyou'rewronganyway. Whateveryoudoifyouwanttobecomegreatatityouneedtoworkdayinanddayoutalmosttothepointofaddictionandoveralongperiodoftime.Ifyou'renotwillingtoputinthetimeandworkdon'texpecttoreceiveanyrewards.Consistenthardworkwon'tguaranteeyouthelevelofsuccessyoumaywantbutitwillguaranteethatyouwillbecomereallygoodatwhateveritisyouputallthatworkinto. 1Paragraph1mainlytalksabout. A.thereasonsforsuccess B.themeaningofsuccess C.thestandardsofsuccess D.theimportanceofsuccess 2InParagraph2theunderlinedwordthatrefersto. A.beinggoodatsomething B.settingapracticalgoal C.puttinginmoretime D.succeedinginlife 3Successfulpeoplesuggestdoingwhatonelovesbecause. A.workmakesonefeelpain B.onetendstoenjoyhiswork C.onegivesuphisworkeasily D.ittakesalotoftimetosucceed 4WhatcanweinferfromParagraph4? A.Successfulpeopleliketoshowtheirgreatskills. B.Peoplesometimessucceedwithoutluckortalent. C.Peopleneedtoachievesuccessatthecostoflife. D.Ithelpstothinkthatluckortalentleadstosuccess. 5Whatisthemainthemeofthepassage? A.Havingagoalisvitaltosuccess. B.Beinggoodisdifferentfrombeinggreat. C.Onecannotsucceedwithouttimeandpractice. D.Lucktalentandfamilyhelptoachievesuccess
如图所示四边形ABCD是边长为4cm的正方形动点P在正方形ABCD的边上沿着A→B→C→D的路径以1cm/s的速度运动在这个运动过程中△APD的面积scm2随时间ts的变化关系用图象表示正确的是
如图线段ABCD分别表示甲乙两建筑物的高AB⊥BCDC⊥BC垂足分别为BC从B点测得D点的仰角α为60°从A点测得D点的仰角β为30°已知甲建筑物的高度AB＝34m求甲乙两建筑物之间的距离BC和乙建筑物的高度DC．结果保留根号
ForRachaelandLeighBarmanthereisonlyonewishontheirChristmaslistthisyear﹣﹣﹣thattheirsickdaughterPaigeshouldsurviveuntilDecember25.Fifteen﹣year﹣oldPaigesuffersfrom1rarebraindisease2affects影响asfewas12peopleintheworldandcouldkillheranyday3warning警告. Andherconditionhasgoneeven4badinrecentmonths.HerparentsfilledthefamilyhomewithChristmasdecorations5September1stsoshecouldenjoytherestofherlife.Sincethenshehas6regularopenedChristmaspresentsandreceivedvisitors﹣﹣﹣butshesleepsforupto19hoursadayherparentsknowingthateachtimeshecloseshereyesshemayneverwakeup. MrsBarman7describedealingwiththeconditionaslikebeingondeathrowassheneverknewif8daughterwouldwakeupthenextmorning. ThemothersaidShealwayslovesChristmasandIgetmyheart9breakwhenIseehersufferinglikethisOurbestChristmaspresentwouldbehavingPaigewithusatChristmas.Nomatter10sheleavestheworldwemakesurethatsheisalwayshappy.
LastyearmybrotherandIwenttoMiamiforavacation.Someofmyfriendswhohadbeentherebeforesaid1wasawonderfulholidaydestination.Beforewewentwehadplannedformonthswhenthedaycamewewereready. Afterourplanelandedwewenttothehotel.Wehadmadeourreservationsixmonths2earlybutthemanatthefrontdesksaidtherehadbeenamistake.We3tellthatourroomshadn'tbeenreservedforthatweek4fortheweekafter.Ididn'tunderstand5thiswouldhappenandmycreditcardhadalreadybeencharged6thereservation.What'sworsethehotelhadbeenfullybooked.Whenwewerewonderingwhattodothemanagercameout.Shewas7surprisehelpful.SheapologizedforthemistakeandgaveusaspareVIProomon8topfloor.Wehadneverstayedinsuchanamazingroomandweweren'tchargedextra. ThenextdaymybrotherandIwenttothebeach9wewatchedsomepeopleplayvolleyball.Wegotalittle10sunburnbutthedayhadbeensorelaxingthatwedidn'tmind.
解不等式组．把不等式组的解集在数轴上表示出来．
关于x的分式方程＝的解是．
如图是由四个直角边分别为3和4的全等的直角三角形拼成的“赵爽弦图”小亮随机的往大正方形区域内投针一次则针扎在阴影部分的概率是．
已知顶点为P的抛物线C1的解析式是y＝ax﹣32a≠0且经过点01． 1求a的值 2如图将抛物线C1向下平移hh＞0个单位得到抛物线C2过点K0m2m＞0作直线l平行于x轴与两抛物线从左到右分别相交于ABCD四点且AC两点关于y轴对称． ①点G在抛物线C1上当m为何值时四边形APCG是平行四边形 ②若抛物线C1的对称轴与直线l交于点E与抛物线C2交于点F试探究在K点运动过程中的值是否会改变若会请说明理由若不会请求出这个值．
﹣2的相反数是
IwastenwhenIfirstsatwithmygrandmotherbehindthecashier收银台inhergeneralstore.1Iquicklylearnedtheimportanceoftreatingcustomerspolitelyandsayingthnakyou. AtfirstIwaspaidincandy.2Iworkedeverydayafterschoolandduringthesummerandonweekendsandholidaysfrom8a.m.to7p.m.Myfatherhelpedmesetupabannkaccount.3 BythetimeIwas12MygrandmotherthoughtIhaddonesuchagoodjobthatthepromotedmetosellingcosmetics化妆品.Idevelopedtheabilitytolookcustomersdirectlyintheeye.EventhoughIwasjustakidwomenwouldaskmesuchthingsasWhatcolordoyouthinkIshouldwear?Itookarealinterestintheirquestionsandwasabletotranslatewhattheywantedintomakeup化妆ideas.4 Thejobtaughtmeavaluablelessontobeasuccessfulsalespersonyoudidn'tneedtobeaRocketscientist﹣youneededtobeagreatlistener.5expecttheyareNOlongerwomenpurchasingcosmeticsfrommeinsteadtheyarekidswhotellmewhichtoystheywouldliketoseedesignedanddeveloped. A.LaterIreceived50centsanhour. B.Beforelongsheletmesirtherebymyself. C.Iendedmysellingarecordamountofcosmetics. D.TodayIstillcarrythatlessonwithmeIlistentocustomers. E.Mygrandma'strusttaughtmehowtohandleresponsibility. F.SoonIfoundmyselflookingmorebeautifulthaneverbefore. G.WatchingmymoneygrowwasmorerewardingthananythingIcouldhavebought.
阅读材料设一元二次方程ax2+bx+c＝0a≠0的两根为x1x2则两根与方程系数之间有如下关系x1+x2＝﹣x1•x2＝．根据该材料填空已知x1x2是方程x2+6x+3＝0的两实数根则+的值为
请写一篇吸烟危害的短文. 内容要点吸烟会导致许多疾病甚至一些危及生命的疾病. 吸烟不但对吸烟者自己有害也严重影响不吸烟者的健康. 据报道美国每年至少有32万人因吸烟而丧生.目前约有四千万人仍在吸烟. 可喜的是越来越多的人已认识到其危害开始戒烟. 青年学生不应该养成这一恶习如有这一习惯应尽早戒除.
如图水平地面上有一面积为30cm2的扇形AOB半径OA＝6cm且OA与地面垂直在没有滑动的情况下将扇形向右滚动至OB与地面垂直为止则点O移动的距离为
如图所示正方形网格中△ABC为格点三角形即三角形的顶点都在格点上．1把△ABC沿BA方向平移后点A移到点A1在网格中画出平移后得到的△A1B1C12把△A1B1C1绕点A1按逆时针方向旋转90°在网格中画出旋转后的△A1B2C23如果网格中小正方形的边长为1求点B经过12变换的路径总长．
关于x的一元二次方程ax2﹣2x+1＝0有实数根则整数a的最大值是
如图将两张长为5宽为1的矩形纸条交叉让两个矩形对角线交点重合且使重叠部分成为一个菱形．当两张纸条垂直时菱形周长的最小值是4把一个矩形绕两个矩形重合的对角线交点旋转一定角度在旋转过程中得出所有重叠部分为菱形的四边形中周长的最大值是
IwasneververyneatwhilemyroommateKatewasextremelyorganized.Eachofherobjectshaditsplacebutminealwayshidsomewhere.Sheevenlabeled贴标签everything.Ialwayslookedforeverything.OvertimeKategotnearerandIgotmessier.ShewouldpushmydirtyclothingoverandIwouldlaymybooksonhertidydesk.Webothgottiredofeachother. Warbrokeoutoneevening.Katecameintotheroom.SoonIheardherscreamingTakeyourshoesaway!Whyundermybed!DeafenedIsawmyshoesflyingatme.Ijumpedtomyfeetandstartedyelling.Sheyelledbacklouder. Theroomwasfilledwithanger.Wecouldnothavestayedtogetherforasingleminutebutforaphonecall.Kateansweredit.FromherendoftheconversationIcouldtellrightawayhergrandmawasseriouslyill.Whenshehungupshequicklycrawled爬underhercoverssobbing. Obviouslythatwassomethingsheshouldnotgothroughphone.Allofasuddenawarmfeelingofsympathyroseupinmyheart SlowlyIcollectedthepencilstookbackthebooksmademybedcleanedthesocksandsweptthefloorevenonherside.IgotsointomyworkthatIevendidn'tnoticedKatehadsatup. Shewaswatchinghertearsdriedandherexpressiononeofdisbelief.Thenshereachedoutherhandstograspmine.Ilookedupintohereyes.Shesmiledatme.Thanks. KateandIstayedroommatesfortherestoftheyear.Wedidn'talwaysagreebutwelearnedthekeytolivingtogethergivingin.cleaningupandholdingon. 1WhatmadeKateangryoneevening? A.Shecouldn'tfindherbooks. B.Sheheardtheauthorshoutingloud. CShegotthenewsthathergrandmawasill. D.Shesawtheauthor'sshoesbeneathherbed. 2Theauthortidieduptheroommostprobablybecause. A.shewasscaredbyKate'sanger B.shehatedherselfforbeingsomessy C.shewantedtoshowhercare D.shewasaskedbyKatetodoso 3HowisParagraphImainlydeveloped? A.Byanalyzingcauses. B.Byshowingdifferences. C.Bydescribingaprocess. D.Byfollowingtimeorder. 4Whatmightbethebesttitleforthestory? A.MyFriendKate B.HardWorkPaysOff C.HowtoBeOrganized D.LearningtoBeRoommates
“保护水资源节约用水”应成为每个公民的自觉行为．下表是某个小区随机抽查到的10户家庭的月用水情况则下列关于这10户家庭的月用水量说法错误的是
不等式的解是．
Asweallknowfriendshipisofgreatimportanceinourdailylife.Afriendcangiveushelpandshareourdifficultiesandhappiness.Buthowtomakefriendsisstilldifficulttosomeofus.1 1.Befriendlytoothers.2Youshouldtrytomakeastrangerfeelathomewhereverhehappenstobe.Thinkmoreofothersthanofyourselfandneverjudgeapersonbyhisappearanceandclothes. 2.Bereliable.Ifyouandyourfriendagreetomeetsomewheredon'tbelate.Ifyou'renotgoingtomakeitontimeormakeitatallcallthemassoonasyourealizeit.3Besomeonethatpeopleknowtheycandependon. 3.4Listencarefullytowhatpeoplesayrememberimportantdetailsaboutthemtheirnamestheirlikesanddislikesaskquestionsabouttheirinterestsandjusttakethetimetolearnmoreaboutthem. 4.EncourageyourfriendsAtruefriendalwaysgivescouragetohisfriends.5Nevermakefunoforlaughatyourfriendsinfrontofothers.Youshouldcometosupportthem. A.Whenyousayyou'lldosomethingdoit. B.Afriendtoallisafriendtonone. C.Beagoodlistener. D.Thefollowinginformationcangiveyousometips E.Smileatothersandyouaresuretogetasmileinreturn. F.Hewillremainwiththeminbothgoodaswellasbadtimes. G.Andneverleaveyourfriendwhenheisintrouble.
MyAmericanfriendkindlyinvitedmetoherhometocelebratethisyear'sThanksgivingDay.I1experiencemyfirsteverThanksgiving. OnthatdaywewatchedtheThanksgivingparade游行inNewYorkCityonTV.Myfriend'sfamilysat2frontofthetelevision.TheycamefromallovertheStatesandenjoyedbeingtogether.3lookattheirhappyfacesIthoughtitwasreallyaholidayforfamiliesjustliketheMid﹣AutumnFestivalinChina. ThateveningwehadabigThanksgivingdinner.This4traditionmealincludesroastturkeymashedpotatoesandassortedvegetables.Whenthedishesandplatesarrivedatthetablewestartedtotake5turntosaythethingswewere6thankfor.ThisinfactisaThanksgivingtraditionmanyfamiliespracticeintheUS. Thenthefood7passaroundthetableandweallatefartoomuch.Ialsohaddessertswithmydinner.There8bedifferentkindsofpiessuchasapplepiespumpkinpiesandcoconutpies. IfonementionsThanksgivingonemusttalkaboutBlackFridaytheFriday9followsThanksgivingDay.ShopsacrosstheUnitedStateswillgivetheir10bigsalesofthewholeyearonBlackFriday.Manypeoplegocrazyaboutit.Isawmanylongqueuesoutsidetheshopsonthatday.
如图已知AB是⊙O的直径PA＝PB∠P＝60°则弧CD所对的圆心角等于度．
如图在Rt△ACB中∠C＝90°AC＝3cmBC＝4cm以BC为直径作⊙O交AB于点D． 1求线段AD的长度 2点E是线段AC上的一点试问当点E在什么位置时直线ED与⊙O相切请说明理由．
计算2﹣1+﹣12019+|﹣|﹣π﹣3.140
下列计算中正确的是
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