函数y＝e2﹣e|x|的图象可能是（　　）

用简便方法计算． 1+++ 2++ 3﹣﹣ 4+++ 5+﹣ 6+﹣+

WQXYZ为短周期元素且原子序数依次增大X原子的K层电子数与M层电子数相等Y是常用的灰黑色半导体材料通常状态下YW4呈气态．下图是晶体Y的一种制备路线图．有关说法正确的是

春节小刚给弟弟买了一个如图所示的电动小汽车里面主要的部件是电动机．电动机的工作原理是该电动机的电压由4节干电池提供通过的额定电流为1A电动机线圈电阻为0.5Ω则小汽车正常工作2分钟消耗的电能为J输出的机械能是J．

有一种新的取暖方式﹣电热膜供暖它以纯电阻为发热体用R表示每个房间的电热膜各有一个温控器用S表示控制达到了分户控制和节能的目的以两个房间为例在图中完成电路连接．

2分阅读小题根据汉语提示完成句子;每空一词. 请帮我开一下电脑好吗?我要发一封邮件. Wouldyoupleasethecomputer?Ineedtosendanemail.

氯化铵焙烧菱锰矿制备高纯度碳酸锰的工艺流程如图 已知 ①菱镁矿石主要成分是MnCO3还含有少懿FeAlCaMg等元素 ②相关金属离弓[cMn+＝0.1mo1•L﹣1]形成氯氧化物沉淀时的pH如表 ③常温下CaF2MgF2的溶度积分别为1.46×10﹣107.42×10﹣11回答下列问题 1焙烧时发生的主要化学反应方程式为． 2分析下列图1图2图3氯化铵焙烧菱镁矿的最佳条件是 焙烧温度氯化铵与菱镁矿粉的质量之比为焙烧时间为． 3浸出液净化除杂过程如下首先加入MnO2Fe2+氧化为Fe3+反应的离子方程式为．然后调节溶液pH使Fe3+A13+沉淀完全此时溶液的pH范围围为．再加入NH4F沉淀Ca2+Mg2+．当cCa2+＝1.0×10﹣5mo1•L﹣1时cMg2+＝mo1•L﹣1 4碳化结晶时发生反应的离子方程式为．5流程中能循环利用的固态物质是．

列方程求x的值． 有两桶油第一桶油有24千克如果从第二桶中取出2千克放入第一桶中这时两桶油的重量相等第二桶有多少千克

把圆柱的侧面展开可以得到一个等腰梯形．．

用小正方体搭建一个几何体从上面看到的图形是从左面看到的图形是搭建这个几何体最少要个小正方体最多要小正方体．

已知函数y＝fx的图象如图所示则fx的解析式可能是

10分读下面有关一个学生的问题的文章在每个题目下做简短的笔记 DearMr.Hunt MyproblemisthatIcan'tgetonwithmyfamily.Relationsbetweenmyparentshavebecomedifficult.TheyfightalotandIreallydon'tlikeit.It'stheonlycommunicationtheyhave.IdontknowifIshouldsayanythingtothemaboutthis.Whentheyargueit'slikeabigblackcloudhangingoverourhome.Alsomyelderbrotherisnotverynicetome.HealwaysrefusestoletmewatchmyfavoriteTVshow.Insteadhewatcheswhateverhewantsuntillateatnight.Idon'tthinkthisisfairAthomeIalwaysfeellonelyandnervous.Isthatnormal?WhatcanIdo? SadandThirteen DearSadandThirteen It'snoteasybeingyourageandit'snorthesefeelings.Whydon'tyoutalkaboutthesefeelingswithyourfamily?Ifyourparentsarehavingproblemsyoushouldoffertohelp.Maybeyoucoulddomorejobsaroundthehousesothattheyhavemoretimeforpropercommunication.Secondlywhydon'tyousitdownandcommunicatewithyourbrother?Youshouldexplainthatyoudon'tmindhimwatchingTVallthetime.HoweverheshouldletyouwatchyourfavoriteshowIhopethingswillbebetterforyousoon. Mr.Hunt 1①Thewriter'smainproblem: ②Thewriter'sproblemabouthis/herparents: 2①Thewriter'sproblemabouthis/herbrother: ②Thewriter'sproblemabouthimself/herself: 3TheadvicethatMr.Huntgivesabouthis/herproblemwithhis/herbrother: 4PleasefindthesentenceinthepassagethathasthesamemeaningasHedoesn'talwaysallowmetowatchtheTVprogramIlikebest.请在本文中找与划线句子意思相同的句子 5Thelanguagegoals语言目标ofthispassage:

推拉窗户是旋转现象．判断对错

用NA表示阿伏伽德罗常数的值下列说法正确的是

一个圆锥的体积是24cm3与它等底等高的圆柱的体积比这个圆锥的体积大cm3．

在学习盐的性质时某组同学将碳酸钠溶液和一瓶标签破损的溶液M如图进行反应有白色沉淀产生过滤后得到澄清滤液．同学们对该实验进行了一系列的研究． 探究一M溶液中的溶质是什么 1【提出猜想】该组同学认为M溶液的溶质有两种可能①是②是CaCl2． 2【设计实验】同学们设计了如下方案并进行实验 探究二过滤后澄清滤液中会有哪些溶质 1【提出猜想】猜想一NaOH和Na2CO3猜想二猜想三NaOH． 2【实验验证】同学们针对猜想一进行了如下实验 他们的实验结论是否正确理由是． 3【继续探究】设计实验方案确定滤液中溶质的组成．

两个正方体摆成一排从正面和上面看到的都是长方形．．判断对错

2019年是元素周期表诞生的第150周年联合国大会宣布2019年是国际化学元素周期表年．WXY和Z为原子序数依次增大的四种短周期主族元素．W的一种核素可用于文物年代的测定X与W同周期相邻四种元素中只有Y为金属元素Z的单质为黄绿色气体．下列叙述正确的是

计算能简算的要简算． 72×156﹣56×72 85×+15×75% 80%×0.25﹣60%÷4 1﹣×÷

求出下面图形的周长和面积．单位厘米π＝3.14

黄色超氧化钾KO2可作为宇宙飞船舱的氧源．某学习小组设计以下实验探究KO2的性质请回答相关问题 Ⅰ．探究KO2与水的反应 Ⅱ．探究KO2与SO2的反应 4正确的操作依次是． ①打开K1通入N2排尽装置内原气体后关闭 ②拆卸装置至实验完成 ③检查装置气密性然后装入药品 ④打开分液漏斗活塞K2 5A装置发生的化学方程式为． 6用上述装置验证KO2与SO2反应生成O2还存在不足你的改进措施是． 7改进后再实验待KO2完全反应后将装置C中固体加水溶解配成50.00mL溶液等分为MN两份． ①向M溶液中加入足量的盐酸酸化的BaCl2溶液充分反应后将沉淀过滤洗涤称重为2.33g． ②将N溶液移入填仪器名称中用0.40mol/L酸性KMnO4溶液滴定终点时消耗酸性KMnO4溶液20.00mL． ③依据上述现象和数据请写出该实验总反应的化学方程式．

IfIruledtheworldIwouldtheworldeverythingthatisbad. A.getridofby B.beridofby  C.ridof D.getridof

1分Iwillhaveameetingthisafternoon.Please唤醒meupat2:00pm.

20分为了让学生吃到更加营养安全的食品政府出台了陪餐制要求从4月1日起学校领导陪同学生用餐.请你根据以下要点给校报英语专栏写一篇短文谈谈自己的看法. 1学生吃得健康安全; 2及时发现就餐问题; 3食堂提供食品多样; 4父母更加放心. 注意:1词数80词左右;开头已给出不计入总词数; 2可适当增加细节以使行文连贯; 3参考词汇:规定regulationn.;食堂cafeterian.;营养的nutritiousadj. AnewfoodsafetyregulationwasputintouseonApril1toimprovenutritionandfoodsafetyinschools.Itaskstheschoolmanagerstoeatwithstudentsintheircafeterias.﹣﹣﹣﹣ ﹣﹣﹣﹣ ﹣﹣﹣﹣ ﹣﹣﹣﹣

实验能力和创新意识是化学学科核心素养的重要内容之一．某研究性学习小组在验证反应Fe+2Ag+＝Fe2++2Ag的实验中检测到Fe3+．发现和探究过程如下向硝酸酸化的0.05mo1•L﹣1硝酸银溶液pH≈2中加入过量铁粉搅拌后静置烧杯底部有黑色固体溶液呈黄色． 1检验产物 ①检验上层清液中所含离子的方法取上层清液滴加产生蓝色沉淀说明溶液中含有Fe2+． ②经检验黑色固体为Ag检验方法取出少量黑色固体洗涤后加入适量稀硝酸使固体溶解再滴加填试剂产生填现象． 2针对溶液呈黄色甲认为溶液中有Fe3+乙认为铁粉过量时不可能有Fe3+乙依据的原理是．用离子方程式表示o 针对这两种观点继续实验取上层清液滴加KSCN溶液溶液变红证实了甲的猜测．同时发现有白色沉淀产生且溶液颜色深浅沉淀量多少与取样时间有关对比实验记录如下 资料Ag+与SCN﹣生成白色沉淀AgSCN 3实验中溶液变为红色的离子方程式为产生白色沉淀说明存在填离子符号． 4对Fe3+产生的原因做如下假设 假设a可能是铁粉表两有氧化层能产生Fe4+假设b空气中存在O2发生反应4Fe2+O2+4H+＝4Fe3++2H2O产生Fe3+假设c酸性溶液中的NO3﹣将Fe2+氧化为Fe3+ 假设d溶液存在Ag+将将Fe2+氧化为Fe3+ 下述实验可证实假设abc不是产生Fe3+的主要原并可证实假设d成立． ①实验向硝酸酸化的溶液pH≈2中加入过量铁粉搅拌后静置不同时间取上层清液滴加KSCN溶液．3min时溶液呈浅红色30min后溶液儿乎无色． ②实验Ⅱ的现象说明发生了反应用离子方程式表示． 5实验Ⅱ中发生的反应可以用下列装置来验证．其中甲溶液是分别取电池工作前与工作一段时间后左侧烧杯中溶液同时滴加KSCN溶液前者或后者红色更深．

如图所示为小明在科学实践课上制作的折纸青蛙用手按住青蛙的后部此时青蛙相对于桌面静止松手后青蛙就可以向前跳动则下列说法正确的是

8分Aswegrowoldwerealizethatwehavesolittletimetoreadandtherearesomanygreatbooksthatwe'veyettogetaroundto.Yetre﹣readersareeverywherearoundus.Forcertainfansre﹣readingTheLordoftheRingsisaconventionalpracticeannually.OnefriendtoldmethatJaneAusten'sEmmacanstillsurprisehimdespitehishavingreaditover50times. Newsuddenclearunderstandingscanbegainedfromtheprocessofre﹣reading.JournalistRebaccaMeadalong﹣timeEnglishwomaninNewYorkfirstcameacrossGeorgeEliot'sMiddlemarchat17.Sincethenshehasreaditagaineveryfiveyears.Witheachre﹣readingithasopenedupfurther;ineachchapterofherlifeithasresonated引起共鸣differently.Meadevidencedthelargenumberofwaysinwhichreallygoodbooksnotonlystandthetestofrepeatreadsbutalsoofferfreshgiftseachtimewecracktheirspines.Thesekindsofbooksgrowwithus. Scientistshavealsorecognizedthementalhealthbenefitsofre﹣reading.ResearchconductedwithreadersintheUSfoundthatonourfirstreadingweareconcernedwiththewhatandthewhy.Secondtimeroundwe'reabletobetterappreciatetheemotionsthattheplotcontinuestoexpress.AsresearcherCristelRusselloftheAmericanUniversityexplainedreturningtoabookbringsneworrenewedappreciationofboththegreatbookanditsreaders. It'struethatweoftenfindformerselvesonthepagesofoldbooksifwe'refondofmakingnotesonthepages.Thesetextscancarryusbacktoatimeandplaceandremindusofthekindofpersonthatwewerethen.We'rechangednotonlybylivedexperiencebutalsobyreadexperience﹣bythebooksthatwe'vediscoveredsincelastreadingtheoneinourhand. Moresothanthemoviedirectororthemusicianthewritercallsuponourimaginationsusingwordstoleadustopicturethisdeclarationofloveorthatunfaithfulnessinlife.Abookisajointprojectbetweenwritersandreadersandwemustpoursomuchofourselvesintoreadingthatourownlifestorycanbecomeconnectedwiththestoryinthebook. Perhapswhat'sreallystrangeisthatwedon'tre﹣readmoreoften.Afterallwewatchourfavouritefilmsagainandwewouldn'tthinkoflisteningtoanalbumonlyonce.Wetreasuremessyoldpaintingsasobjectsyetofallartformsliteraturealoneisalargelyone﹣timedelight.AbookofcoursetakesupmoretimebutasMeadconfirmstherewardsmakeitadequatelyworthwhile. 1ThetwobooksarementionedinParagraph1mainlyto. A.attracttheattentionofreaders B.introducethetopicofthepassage C.providesomebackgroundinformation D.showthesimilaritybetweenre﹣readers 2TheunderlinedexpressioncracktheirspinesinParagraph2refersto. A.recitethem B.re﹣readthem C.recallthem D.retellthem 3Itcanbelearnedfromthepassagethat. A.readingbenefitspeoplebothmentallyandphysically B.readersmainlyfocusonfeelingsontheirfirstreading C.weknowourselvesbetterthroughre﹣readingexperience D.writersinspirethesameimaginationsasfilmdirectorsdo 4Thepurposeofthepassageisto. A.callondifferentunderstandingsofoldbooks B.focusonthementalhealthbenefitsofreading C.bringawarenesstothesignificanceofre﹣reading D.introducetheeffectivewaysofre﹣readingoldbooks

小红家的新房装修在厕所里安装了带有排风扇的照明灯灯和排风扇都可以单独工作且排风扇有两个档位可以调整排风的强度下列电路符合要求的是

1分根据下列句子的句意汉语提示或英语解释写出空白处所缺单词的正确形式;每空一词. Theworld'slongestcross﹣seabridge﹣theHongKong﹣Zhuhai﹣MacaoBridgeisconsideredasoneoftheseven奇迹ofthemodernworldbysomepeople.

10分第一节语法填空 阅读下面材料并填空有的答案要填入适当的内容有的答案要用括号内单词的正确形式但每个答案不多于3个单词. Oneoftheworld'smostdangeroussportsismountainclimbingandoneofthe1popularplacesforthisistheHimalayas.TheHimalayas2runalongthesouthwesternpartofChina. OfallthemountainsQomolangmarisesthehighestandisthemostfamous.3is8844.43metershighandsoisvery4dangertoclimb.Itisveryhardtotakeinairasyougetnearthetop. ThefirstChineseteam5reachthetopin1960while6firstwomantosucceedwasJunkoTaibeifromJapanin1975. Whydosomanyclimbersrisktheirlives?Oneofthemain7reasonisthatpeoplewanttochallengethemselves8ofdifficultiesThespiritoftheseclimbersshowsusthatweshouldnevergiveup9trytoachieveourdreams.Italsoshowsthathumans10bestrongerthantheforcesofnatureinsomesituations

一个小数的小数点向右移动两位比原来的小数大了1.98原来这个小数是．

2分阅读小题根据汉语提示完成句子;每空一词. Readthebookcarefullyandyouwillnotmakemistakes.改为同义句 readthebookcarefullyyouwillnotmakemistakes.

用数学归纳法证明从n＝k到n＝k+1左边应增加的项是

0既不是正数也不是负数．．判断对错

随机变量X～则D2X＝

如图是abc三种物质的溶解度曲线下列分析不正确的是

风车转动是平移现象．判断对错

光气COCl2在塑料制药等工业生产中有许多用途其化学性质不稳定遇水迅速产生两种酸性气体．回答下列问题 1少量COCl2可用烧碱溶液吸收发生反应的离子方程式为． 2工业上用CO和Cl2在高温活性炭催化作用下合成光气 Cl2g+COg⇌COCl2g△H＝﹣108kJ•mol﹣1． 所需CO来自CH4与CO2的催化重整反应．查阅文献获得以下数据 CH4g+2O2g═CO2g+2H2Ol△H1＝﹣890.3kJ•mol﹣1 2H2g+O2g═2H2Ol△H2＝﹣571.6kJ•mol﹣1 2COg+O2g═2CO2g△H3＝﹣566kJ•mol﹣1 则CH4与CO2催化重整反应生成CO和H2的热化学方程式为． 3在T℃时向盛有活性炭的5L恒容密闭容器中加入0.6molCO和0.45molCl2CO和COCl2的浓度在不同时刻的变化状况如图所示 ①反应在第6min时的平衡常数为第8min时改变的条件是． ②在第12min时升高温度重新达到平衡时COCl2的体积分数将填增大不变或减小原因是． 4Burns和Dainton研究了反应Cl2g+COg⇌COCl2g的动力学获得其速率方程v＝k[cCl2]3/2[cCO]mk为速率常数只受温度影响m为CO的反应级数． ①该反应可认为经过以下反应历程 第一步Cl2⇌2Cl快速平衡 第二步Cl+CO⇌COCl快速平衡 第三步COCl+Cl2→COCl2+Cl慢反应 下列表述正确的是填标号． A．COCl属于反应的中间产物B．第一步和第二步的活化能较高 C．决定总反应快慢的是第三步D．第三步的有效碰撞频率较大 ②在某温度下进行实验测得各组分初浓度和反应初速度如表 CO的反应级数m＝当实验4进行到某时刻测得cCl2＝0.010mol•L﹣1则此时的反应速率v＝mol•L﹣1•s﹣1已知≈0.32．

针对新高考改革学校将根据同学们选科情况进行重新分班在分班之前一个小组的6名同学要合影留念其中有2名女生4名男生则这2名女生相邻且男生甲不站在两端的站法有种用数字作答

8分Thehousewasquietat5amandTim'smotherwasasleep.Onlythesoundofthebigfreezerbrokethequiet.He'ddreamtofthecavelastnight.Thepurring轻微颤动声ofthefreezerhadbeenthesea.Timpulledonasweaterandputsomeapplesintohisschoolbag.Itwastooearlyforbreakfast.He'deatafterhe'dbeenthroughthecavesittingontherocksandstaringatthesea.Hewishedhehadaproperpack.Hisschoolbagwouldhavetodo.WhatelseSandwiches﹣buthismothermightwakeupifhestartedpullingoutbreadforsandwichesshe'dwanttoknowwhyhehadtoleavesoearly.Hesettledforsomebiscuitsandleftanotestucktothetable:GonetoMichael's.BacktonightTim.Theskywashighandsoftandlightoutsidethoughthesunstillwasn'tup.Eventhehighwayupthehillwasquietashemadehiswaydownthestreet.Thewindfromtheseawasfreshandsweet.Thesandhillsstillbreathedheatfromyesterday'ssunthoughthetopofthesandwascool.Herandowntothebeachimpatientlybuttherewasnoonejustdrysanddancingintheearlywindandseabirdsmarchingupanddownwatchingthewaves.Thelightchangedsuddenly.Thefirstraysofsunlightstretchedacrossthesea.Thesunwaspushingitswayovertheedgeoftheworld.OverthefirstrocksalongtothepointTimglancedback.Thebeachwasstillempty.Thesunsailedhigherinthesky.Hecouldseethecavenowevendarkerinthemorninglight.Thesandturnedsilverthendarkgoldasthewaterflowedawayfromit.Hehadtoforcehimselftogocloser.WhywasitsomuchmoremysteriousnowButitwouldbesillytogobacknowaftersomuchtrouble.Heneedn'tgoinalltheway1WhatdidTimdoatthebeginningofthestoryA.Heputasweaterinhisschoolbag.B.Hehadbreakfastathome.C.Heleftanoteonthefreezer.D.Heleftthehousequietly.2WhatmadeitpossibleforTimtoseetheentrytothecaveA.Theheightofthefirstrocks.B.Thechangeinthepositionofthesun.C.Theupsanddownsofthewaves.D.Thevaststretchofthesunlitbeach.3WhichofthefollowingstatementsisTRUEaccordingtothestoryA.Timwastheonlypersononthebeach.B.SeabirdsflewawaywhenTimarrived.C.Thesealookedlikeapieceofgold.D.TheskygotdarkasTimreachedthecave.4InthestoryTim'smoodchangedfrom.A.lonelinesstocrazinessB.anxiousnesstoexcitementC.eagernesstonervousnessD.helplessnesstohappiness

8分Conventionalwisdomisamajorbarriertoinnovation创新thatthreatensthesurvivalofcompanieseverywhere.It'sbasedontheassumptionthatoldideaswillalwaysworksotheyshouldn'tbechallenged.Whilethismaybeavalidassumptioninsituationsthatdon'tchangeit'sunlikelytoholdtrueinachangingsituation.Intoday'srapidchangingglobalenvironmentoldmethodsoftendon'tworkandstubbornlyusingthemcanleadtomajorproblems. Mostpeopleseemtoagreewithconventionalwisdombecauseitgivesoneafalsesenseofsecurity.Ifeveryoneelsebelievesitthenitmustbetree.Individualswhouseconventionalwisdomarecertainthattheyarerightandbeingfightisgood.Theywanttocontinueusingoldideasratherthantakeriskswithchangesthatmightnotwork.In1977KenOlsenco﹣founderandCEOofDigitalEquipmentCorporationDECstatedThereisnoreasonforanyindividualtohaveacomputerinhishome.DespitebeingadominantleaderinthecomputerindustryDECnolongerexists. Peopleseemtoforgetthatsinceinnovationisachangetherecanbenoinnovationwithoutchange.Unfortunatelyconventionalwisdompreventsleadersfollowersandcompaniesfromchangingandthereforeinnovating.Ifcompaniesdon'tinnovatebuttheircompetitorsdothefutureislikelytobeproblematic.Breakingfromconventionalwisdomhasledtomanyofthemostinnovativecompaniesandproductsinhistoryacrossmanyindustriessoithasapowerfuleffectonbusinesssuccess. TedTurnerfounderofCNNknewlittleifanythingaboutthenewsbusinessbutheknewitwasinconvenienttowatchnewsonlyatthedinnerhouraswascommonbeforeCNN.Turner'ssolutionwastocreateacable有线的channeldevotedtonews24hoursaday.Thenewsestablishmentreflectedconventionalwisdomatthetimeandpredictedhisideawouldfailbecausenoonewantedtowatchthenewsallday.Howeveritdoesn'ttakearocketscientisttounderstandthatviewersdon'thavetowatchthenewsalldayfortheCNNtowork.Viewersjusthavetowatchwhentheywanttogetinformation.DuetoconventionalthinkingthecriticsfailedtorecognizetheopportunitythatwascleartoTed.Theyassumedthatonlywhatwasfamiliartothemcouldworkinthefuture. Conventionalwisdompreventscreativityflexibilityandrisk﹣takingsounconventionalleadersenthusiasticallybreakfromit.Tosurviveboomandmaintaincompetitiveadvantagecompaniesmustbeflexiblewhenreactingtochange. 1DEChasdisappearedprobablybecause. A.theCEOstucktotheconventionalideas B.theconsumersdidn'tlikeitsproducts C.theleaderslackedthesenseofsecurity D.theemployeestookmanyriskswithchanges 2ThefoundingofCNNisusedasanexampletoprove. A.missingopportunitiescouldleadtofailure B.watchingnewsatthedinnerhourisconvenient C.changingcouldcontributetobusinesssuccess D.conventionalwisdominfluencesbusinesssuccess 3Whatdoestheunderlinedpartprobablymean. A.RocketscientistscanensuretheCNNworksproperly. B.It'seasytoknowpeopleneedn'twatchthenewsallthetime. C.It'snecessarytounderstandwhenpeoplewatchthenews. D.Mostoftheviewersdon'tliketowatchthenewsatwork. 4Thepassageismainlywrittentotellusthat. A.oldmethodsarechangingwithtime B.opportunitiesleadtobusinesssuccess C.successfulcompaniesneedwiseleaders D.conventionalwisdomlimitsinnovation

北京到武汉飞机票917元乘飞机大约元．

下列实验操作中正确的是

铬Cr及其化合物如三氧化二铬Cr2O3铬酸钠Na2CrO4重铬酸钠Na2Cr2O7等是工业中有重要作用的物质．有如下反应 ①Cr2O3+3Ca2Cr+3CaO ②2Cr2O3+3O2+8NaOH4Na2CrO4+4H2O ③2Na2CrO4+H2SO4═Na2Cr2O7+X+H2O 回答下列问题 1反应③中X的化学式为．在上述反应中属于置换反应的是反应后铬元素化合价升高的是． 2Ca﹣CaCrO4电池是战术导弹的常用电源．向Na2CrO4溶液中加入CaCl2溶液可得CaCrO4沉淀反应的化学方程式是．

糖糖买了8本绘本数学付100元找回m元．每本绘本数学的价格是元．

最新研究表明As2O3在医药领域有重要应用．某小组从工业废料中提取As2O3设计流程如图 已知H3AsO3为弱酸热稳定性差． 1写出一条碱浸时提高浸取率的方法碱浸中H3AsO3转化成Na3AsO3的 离子方程式为． 2氧化时常在向混合液中通入O2时对体系加压目的是． 3沉砷过程中有如下反应 ①CaOH2s⇌Ca2+aq+2OH﹣aq△H＜0 ②5Ca2++OH﹣+3AsO43﹣⇌Ca5OHAsO43↓△H＞0 沉砷率与温度关系如图．沉砷最佳温度为高于85℃时沉砷率下降的原因是． 4还原过程中获得H3AsO3的化学反应方程式为 操作A为过滤滤液Ⅱ的主要成分是． 5若每步均完全反应氧化’’和还原时消耗相同条件下O2和SO2体积分别为xLyL则废水中nH3AsO3nH3AsO4＝写出含xy的计算式．

2.5分如图是某同学探究燃烧条件的改装装置往烧杯中加入下列哪种物质能引起白磷燃烧的是

2.5分有XYZ三种金属X在常温下就能与氧气反应YZ在常温下几乎不与氧气反应如果把Y和Z分别放入硝酸银溶液中过一会儿在Z表面有银析出而Y没有变化．根据以上实验事实推断XYZ三种金属的活动性由强到弱的顺序正确的是

一种商品随季节出售如果按现价降低10%每件仍可盈利200元如果按现价降低20%则每件亏损220元．这种商品每件的进价是多少元

一件商品现价30元比原价降低了10元降低了%．

保温杯的价格是100元打八折销售买两个这样的保温杯比原来便宜元．

1分﹣﹣﹣WhatshouldIdodoctor? ﹣﹣﹣healthyyoushouldtakemoreexercise. A.Keep B.Keeping C.Tokeep

8分IwasverydisappointednottobeabletogotothejazzconcertlastFriday.TheadvertisementinthepapersaidthatyoucouldbuyticketsatthetheatreboxinRichlandHillsanydaybetween10:00and4:00.SinceIworkfrom9:00to5:30theonlytimeIcouldgotothetheatrewasduringmy45﹣minutelunchbreak. UnfortunatelythetheatreisontheothersideofthetownandthebusservicebetweenmyofficeandRichlandHillsisnotverygood.Butifyouareluckyyoucanmaketheroundtripin45minutes.LastMonday.Istoodatthebusstopfor15minuteswaitingforthebusBythetimeIsawonecomearoundthecornertherewasnotenoughtimelefttomakethetrip. SoIgaveupandwentbacktotheoffice.ThesamethinghappenedonTuesdayandagainnextday.OnThursdaymyluckchanged.Igotonabusrightawayandarrivedatthetheatreinexactly20minutes.WhenIgottherehoweverIfoundalonglineofpeopleattheboxofficeIheardonemansayhehadbeenwaitinginlineforoveranhour.RealizingIwouldnothaveenoughtimetowaitinline.Icaughtthenextbusandheadedbackacrossthetown. ByFridayIrealizedmyonlyhopewastomakethetripbytaxiitwasexpensivebutIfeltitwouldbeworthittoheartheconcert.Thetripbytaxionlytook10minutesbutfeltlikeanhourtome.WhenIgottothetheatreIwasrelievedtoseethatnobodywaswaitinginline.ThereasonhoweverIquicklydiscoveredwasthattheyhadalreadysoldallthetickets. 1ThemanlearnedthattherewouldbeaconcertlastFriday. A.fromthenewspaper B.fromhisfriends C.fromoneofhiswork﹣mates D.overtheradio 2Hetriedtogotothetheatreeverydaybutmanagedtogetthereonly. A.once B.threetimes C.twice D.fourtimes 3Onedaythemantooktogettothetheatrebybus. A.forty﹣fiveminutes B.fifteenminutes C.overanhour D.justtwentyminutes 4Theunderlinedwordrelievedmaybestbereplacedby. A.surprised B.puzzled C.pleased D.sorry

NowadayseveryoneisresponsibleforaharmonioussocietyinChina. A.makingup B.takingup  C.openingup D.buildingup

如图所示练功房一侧的墙壁是用平面镜MN装饰的若光源A发出一束光经过平面镜反射后正好射到房顶的B点请画出这束光线的光路图．

CO2是造成全球气候变暖的主要气体同时也是一种来源丰富价格低廉的碳资源．中科院福建物构所谢奎及其团队利用电能将CO2高效转化为COCO和H2可生产优质燃料和多种化工产品实现碳资源的循环利用． 1已知反应过程中能量变化如表和曲线图1所示 反应③的△H3＝kJ/mol． COg+2H2g⇌CH3OHl△H4＝kJ/mol此反应中有利于提高H2平衡转化率的条件是填字母． A．高温低压B．低温__C．高温__D．低温低压 2在不同的电压下CO2H2O混合电解转化为COH2的电流效率如图2所示注电流效率＝×100% ①由图可知生成CO和H2有相互填促进抑制或无影响作用． ②用此法生产的CO和H2合成CH3OH为使CO和H2利用率最高电解时应控制电压在V左右选填515232530． 3在300℃时将0.60molCO1.40molH2充入4L密闭容器中在恒温恒容下发生反应COg+2H2g⇌CH3OHg△H＜0甲醇的物质的量浓度随时间的变化如图3所示 ①图中判断反应到达平衡状态的依据是． ②5min内H2的平均反应速率vH2＝mol/L•min． ③若在500℃条件下将1.00molCO0.50molH2和0.50molCH3OH充入容积为2L的密闭容器中此时反应将填字母． A．正反应方向反应B．逆反应方向反应C．达到平衡D．无法判断

把一个圆柱体的木块截成两个圆柱体这两个圆柱体木块的表面积的和比原来圆柱体的表面积增加了一个底面积．判断对错

观察身边的物理下列估测最不符合实际的是

平移的关键是要数清楚格子找到对应的点旋转的关键要确定好对应的线段或点的位置．判断对错

计算下面各题能简算的要简算． 1 2 398+99×98

1分Ihaven't收到来信fromSallybefore.

25分假定你校正在开展根除陋习创建文明校园活动.请你以此为主题用英语写一篇发言稿向全校学生倡议: 1.根除:乱扔垃圾浪费食物吸烟2.提倡:讲礼貌互助 Dearfriends Asisknowntoallourschoolhaslaunchedacampaignagainstbadhabitsinordertobuildacivilizedcampus. That'sall.Thankyou.

一个钝角三角形的其中一个锐角是40°另一个锐角一定小于

圆柱的底面直径可以和高相等．判断对错

拧瓶盖属于平移现象．判断对错

10分当前许多学生在课外沉溺于智能手机smartphones.针对这一现象学校将组织开展一次拒绝手机__健康学习生活的演讲活动.请你根据下面的提示用英语写一篇演讲稿. 要求:1.字迹工整书写规范包含全部要点适当发挥; 2.文中不得出现真实的学校班级名称; 3.80词左右开头和结尾已给出不计入总词数; 4.请将书面表达内容写在答题卡上相应的位置. 参考词汇:eyesight视力disadvantage不利条件keepawayfrom远离 takeanactivepartin积极参加 Girlsandboys WiththedevelopoftheInternetmanystudentshavesmartphones. __________ That'sallThankyou!

1分﹣﹣﹣You'dbettertakeanumbrella.Theweatherreportsaysitintheafternoon. ﹣﹣﹣Thankyou.Iwillputoneinmybag. A.willrain B.rains C.israining

妈妈今天挣了100元钱记为+100元爸爸今天花了50元应记为﹣50元．判断对错

求下面图形的周长．

1分﹣﹣﹣WhereisMonica?Ican'tfindheranywhere. ﹣﹣﹣Shebeinthelibrary.Shelovesreadingbookswhensheisfree. A.must B.need C.can't

小天鹅洗衣机开展促销活动现在A商场按满100元减30元的方式销售在B商场按折上折就是先打九折在此基础上再打八折．如果同样一台洗衣机在AB两个商场的标价都是1680元．在哪个商场买更省钱AB两商场相差多少钱

10分Myteachersaidtoastudent:Givemeyourphone. Wealllookedinsurprise.KyleastudentwhoIneversawtextinclassgavetheteacherhisphone. WhentheteacherlefttwostudentswhoIoftensawtextinclassstartedboastingabouthowtheysenttextmessagesandnevergotcaught. Kyleyoustupid!IputmyphoneundermydesksoitlookslikeI'mlookingatmytextbooksoneofthemsaid. Isn'titfunnythatwealwaystextandnevergetcaught?theotheronelaughed. TheymusthavethoughttheyweresmartbecausetheynevergotcaughtandKyledid.Butwhichsituationisworse:gettingcaughtorgettingawaywithit?Rulesarethereforareason. Thesetwostudentsmightnotgetcaughtbutneitherofthemhadgoodgrades.Theydidn'tpayanyattentiontotheclassandIthinktheywillkeepdoingthis. Peopledon'tjustbreakbigrulesandgetthrownintojail监狱overnight.Theytakeitonestepatatime.Kylemighthavegottencaughtbutatleasthelearnedagoodlesson.Hewillnotbreaktherulesinthefuturesohewilllearnmoreinclassandstayoutoftrouble.It'ssmarternottobreaksmallrules. 1WhydidtheteacheraskKyletogiveuphisphone? A.BecauseshewantedtofindoutwhatKylejusttexted. B.BecauseKylewasplayingwithhisphoneinclass. C.BecausethestudentswantedtoseeKyle'snewphone. 2WhatdoestheunderlinedwordboastinginParagraph3probablymean? A.吹嘘 B.讨论 C.报告 3Thetwostudentsinthewriter'sclassfeltquitebecausetheywerenevercaughtbytheteacher. A.surprised B.calm C.proud 4Inthefuturethetwostudentsmight. A.paymoreattentioninclass B.keeptextingduringclass C.notbreakanyrulesagain 5Fromthestoryweknowthatthewriter. A.doesn'tthinkKyleisagoodstudent B.thinksgettingcaughtinclassisworse C.thinksthetwostudentsmightbreakbiggerrules

一个三角形经过它的一个顶点画一条线段把它分成两个三角形其中一个三角形的内角和是

一个等腰三角形顶角的度数是底角的2倍底角是

用盐矿提取得到的粗盐样品中常含有杂质氯化镁氯化钙．小林设计了以下提纯方案 若方案中先除去的是氯化镁接着除去氯化钙请回答 1试剂b的化学式是． 2操作过程中加适量稀盐酸时发生的属于中和反应的化学方程式． 3实验中操作c的名称是若所取粗盐样品中含氯化钠的质量为mg经过操作c后得到精盐的质量为ng试分析n＞m的原因是．

圆柱的底面直径可以和高相等．判断对错

在学校组织的爱阅读活动中小明看一本书看了a天平均每天看20页还剩5页没看这本书的总页数用含字母的式子表示是页．如图当a＝13时小明看的这本书是．

一种常见的电动自行车使用前要先对车上的蓄电池充电．骑行时蓄电池对车上的电动机供电电动机为车提供动力．如表是这种品牌电动自行车的一些主要技术参数．请回答 1若质量是60kg的人骑电动自行车在水平路面上以6m/s的速度匀速行驶时受到的阻力是人与车总重的0.02倍．求行驶10min电动机对自行车做的功． 2若摩托车每行驶10km耗油0.5L油价约6元/升照明用电的电费约0.6元/千瓦时请通过计算说明使用电动自行车与摩托车哪种更经济． 3该电动自行车的一个轮胎与地面的接触面积为0.005m2则一个60kg的人骑该电动自行车在公路上行驶时对路面的压强是多少

一个圆锥与和它等底等高的圆柱体积相差60dm2这个圆锥的体积是dm3．

2.5分下列物质属于纯净物的是

RedroseswereherfavoriteshernameswasalsoRose.Andeveryyearherhusbandsentthemtiedwithprettybows.Theyearhediedtheroseswerestill1toherdoor. Eachyearhesentherrosesandthe2wouldalwayssayIloveyouevenmorethisyearthanlastyearonthisday.Myloveforyouwillalways3witheverypassingyear.Sheknewthiswasthelasttime4therosewouldappear.Herlovinghusbanddidnotknowthathewould5.healwayslikedtodothingsearly.Thenifhegottoobusy6wouldworkoutfine. Ayearwentbyanditwas7tolivewithouthermate.ThentheveryhourasonValentinesbeforethedoorbellrangandtherewererosessittingbyherdoor.Shebroughttheroses8callingthefloristshop.Theowneransweredandsheaskedhimifhewouldexplainwhywouldsomeonedothistoher9hersuchpain? IknowyourhusbandpassedawaymorethanayearagoTheownersaidIknewyou'd10andyouwouldwanttoknow.Theflowersyoureceivedtodaywere11inadvance.Youhusbandalwaysplannedaheadheleftnothingtochance. Shethankedhimand12thephonehertearsnowflowinghard.Herfingersshakingassheslowlyreachedto13thecard.Insidethecardshesawthathehadwrittenheranote.ThisiswhathewroteHellomyloveIknowit'sbeenayear14I'vebeengoneIhopeithasn'tbeentoohardforyoutoovercome.Iknowitmustbelonelyandthepainisvery15.forifitwastheotherwayIknowhowIwouldfeel.Theloveweshared16everythingsobeautifulinlife.Ilovedyoumorethanwordscansay. YouweremyfriendandloverIknowit'sonlybeenayear17pleasetrynottogrieve.Iwantyoutobehappy18whenyoushedyourtears.Thatiswhytheroseswillbesenttoyouforyears. Whenyougetthese19thinkofallthe20thatwehadtogetherandhowbothofuswereblessed.IhavealwayslovedyouandIknowIalwayswill.Myloveyoumustgoonyouhavesomelivingstill. 1A.passed B.shown C.presented D.delivered 2A.note B.message C.line D.information 3A.disappear B.decrease C.grow D.keep 4A.that B./ C.which D.what 5A.passby B.passaway C.passdown D.passon 6A.everything B.something C.nothing D.anything 7A.happy B.meaningful C.hard D.impossible 8A.in B.out C.along D.up 9A.curing B.healing C.causing D.killing 10A.ask B.wonder C.doubt D.telephone 11A.purchased B.grown C.planted D.designed 12A.pickedup B.turnedup C.heldup D.hungup 13A.buy B.get C.read D.write 14A.when B.that C.before D.since 15A.strong B.weak C.true D.real 16Amade B.bad C.let D.left 17A.so B.but C.though D.still 18A.even B.only C.merely D.just 19A.roses B.belongings C.congratulations D.remarks 20A.sadness B.disappointment C.happiness D.sufferings

某村今年水稻产量是去年的120%今年比去年增产%．已知增产了84吨这个村去年水稻产量是吨．

1分isquiteeasyforpeopletofindanyplaceintheworldwiththehelpofonlinemaps. A.That B.It C.One

一个等腰三角形底角与顶角度数的比是41则这个三角形的顶角是

怎样算简便就怎样算 +﹣×24 +×24 24×× 36×++

8分TheRoyalMinthaschosenBeatrixPotter'sthievingPeterRabbitasthefirstcharacterfromchildren'sliteratureevertoappearonaUKcoin.PeterpicturedinthebluejacketthatheisforcedtoabandoninthegardenofMrMcGregorwhenheiscaughtstealingvegetablesiscapturedonaspecialcolourededitionofa50pcoinavailablefromnow.TheRoyalMintwhichdescribedPeterasthemostrecognizableofPotter'screationsandoneofthemostcherishedfromchildren'sliteraturewillreleaseuncolouredversionsofthecoininchangelaterthisyear.ThreemoreofPotter'scharacterswillalsobecommittedtocurrencylaterthisyearaspartofcelebrationsmarking150yearssincethechildren'sauthor'sbirth.TheimageshavebeencreatedbycoindesignerEmmaNoblewhosaiditwasamazingtobegiventheopportunitytoworkwithsuchfamousandtreasuredliterarycharacters.Potter'sTheTaleofPeterRabbitfeaturingPeterandhisbetter﹣behavedsiblings兄弟姐妹FlopsyMopsyandCottontailwasthefirstofherstoriestobepublishedreleasedin1902byFrederickWarne&Co.Potterwouldgoontofollowitwithaseriesofmuch﹣lovedstorieswhichremainpopulartodayfromTheTaleofSquirrelNutkintoTheTaleofJemimaPuddle﹣Duck.1Whichcharacterfromchildren'sliteraturecanbefoundontheUKcoinA.JemimaPuddle﹣DuckB.SquirrelNutkinC.FlopsyMopsyandCottontailD.PeterRabbit2AccordingtothepassagethecoinswillbereleasedbytheRoyalMintto.A.celebratethe150thanniversaryofthebirthofBeatrixPotterB.celebratethe150thanniversaryofthebirthofPeterRabbitC.celebratethefirstpublicationofTheTaleofPeterRabbitD.promotethesalesofBeatrixPotter'sworks3WhichofthefollowingstatementistrueA.PeterRabbitisoneofthemostrecognizedliterarycharactersinUK.B.TheTaleofPeterRabbitmainlyfeatureshisbetter﹣behavedsiblings.C.ItwasEmmaNoblewhocreatedPeterRabbitthefamousliterarycharacter.D.UncolouredversionsofthePeterRabbitcoinareavailablenow.4WhereisthispassageprobablytakenfromA.AnautobiographyB.Achildren'sbookC.AtravelguideD.Anewsreport

已知函数fx＝alnx+x2﹣1+axx＞0其中a为实数． 1求函数fx的单调区间 2若函数fx≥0对定义域内的任意x恒成立求实数a的取值范围 3证明+++＞对任意的正整数mn成立．

﹣Doyouregretupyouropinionthateverychildshouldtakepartinservicelearning? ﹣No.OnthecontraryIthinkitisverynecessary. A.bringing B.tobring  C.tobebrought D.beingbrought

小红用斜面小车装置来探究力对物体运动的影响她让同一小车从同一斜面的同一高度滑下在表面材料不同的水平面上运动分别停在如图甲所示的不同地方． 1小车从斜面下滑时速度越来越快这是因为小车的重力势能转化为缘故．由实验现象我们可以推断假如表面绝对光滑水平面上运动的物体在水平方向上不受力它将． 2小红又用斜面和铁球研究物体动能的大小与哪些因素有关．小红先让铁球A从斜面上高h的位置由静止释放撞击木块B如图乙所示记录下推动木块运动的距离S． 若要研究动能大小与速度的关系小红接下来的操作要领是选择选填相同的小球或不同的小球让小球从选填同一高度或不同高度滑下． 3在图乙中物体动能的大小是通过来反映的下面的实验中也用到了这种方法的是． A．用吸引大头针的数量来描述磁性强弱 B．用水流对比电流 C．研究压强与压力关系时探究受力面积不变 D．牛顿第一定律的得出

﹣WhatdoyouthinkofourmanagerMrSmith? ﹣Heisreallysuccessinhiscareerbutinawayheisfailureinhisfamily. A.a/ B.thethe C.aa D.//

公路上都有限制汽车速度的标志以减少交通事故这是因为汽车的速度越大能越大大卡车限制的速度相对于小轿车限制的速度要选填大一些小一些或一样大．

2019年春晚精彩纷呈如图所示是武术少林魂的画面演员甲站在一个由多位演员乙托起的大鼓上下面说法正确的是

10分Whatsubjectdoyouworryaboutthemostatschool?Manystudentsworryaboutmath.Somestudentscan'tsleepwellthedaybeforeamathexam.Othersmayfeelverynervousduringtheexamitself.Buttheremightbeawaytomakethesubjectlessstressful压力大的. Forpeoplewhoareworriedaboutmathposture姿势makesabigdifferenceErikPeperfromSanFranciscoStateUniversitytoldtheDailyMail.That'sright﹣sittingupstraightcanhelpyoudobetteronmathexams. Scientiststested125collegestudents.Theyaskedthemtodoasimplemathexamwhilesittinginaslumped﹣over趴倒的postureorsittingupstraight.Afterthetest56percentofstudentssaidtheexamwaseasiertodoiftheyweresittingupstraight. Slumpingoverisadefensive戒备的posture.Itcanbringaboutbadmemoriesinthebodyandbrain.ThiscanstopyoufromthinkingclearlyPepersaid. Studentswhowerenotnervousabouttakingthemathexamdidnotnecessarilybenefit受益frombetterposture.ButtheydidfindthatdoingmathwhileslumpedoverwasmoredifficultScienceDailyreported. Goodpostureisn'tjusthelpfulfortakingmathexams.Sportspeoplemusiciansandpublicspeakerscanallbenefitfrombetterposture.Whenyoufeelstressedoutyoucanalsotrytositupstraightorstandtall.Itcanhelpyoufeelmorecertainandfocusbetter. 1Whatposturecanmakepeoplefeellessstressedduringmathexams? A.Sittingupstraight. B.Hangingyourhead. C.Lyingonyourback. D.Raisingonehand. 2Whatdidthescientistsaskthecollegestudentstododuringthetest? A.Todosit﹣ups. B.Tocountnumbers. C.Tothinkcarefully. D.Tositindifferentpostures. 3Howmanystudentsinthetestbenefitedfromthebetterposture? A.Allthe125students. B.Lessthanhalfofthem. C.56percentofthem. D.Noneofthestudents. 4Thefourthparagraphiswrittentoexplain. A.whyslumpingovermakesexamshardertodo B.whyslumpingoverisbadforone'shealth C.whysomepeopleslumpoverduringexams D.whypeoplearenervousduringmathexams 5Whichofthefollowingisthebesttitleforthepassage? A.SlumpovertoTakeExams B.SituptoDoMath C.BetterPostureforNervousStudents D.GoodAdviceforBetterExams

怎样简便就怎样算 35×1×3 25×4 1×5.6+ +×27．

一个长方体一个圆柱体和一个圆锥体的底面积相等体积也相等那么圆锥的高是圆柱的长方体高是圆锥高的．

下列短语中从物质变化的角度分析属于化学变化的是

5不是正数因为5前面没有+．判断对错

广东省常住人口为一亿零八百四十九万横线上的数写作其中老年人口有9202800人横线上的数读作少年儿童人口有18846700人少年儿童人口大约有万．

小美的奶奶在冬天遇寒会肩痛于是她就购买如图所示的暖宝宝让奶奶贴用暖宝宝主要是由铁粉活性炭蛭石无机盐和水等合成的聚合物撕开明胶层可立即与空气中的氧气作用从而放出热量．所以它的工作原理是将化学能转化成能再通过的方式让肩膀升温

如图甲所示在研究气泡的运动规律的实验中 1在研究气泡运动的快慢时依据的物理原理是需要的测量工具是和． 2实验中小明设计的操作方案是等气泡运动一段路程到达0点后开始计时并在玻璃管上以0点为起点每隔10cm处做一刻度标记用秒表测出气泡从0点运动到每一个刻线标记处所用的时间如图下表为小明同学在实验中测得的数据请你根据他所测得的数据在图乙中画出s﹣t图象． 3数据分析气泡上升一段路程到达0点后运动速度可以看成是选填不变或变化的．大约是m/s． 4实验中使气泡在管内运动得较慢的目的是．

一种三室微生物燃料电池污水净化系统原理如图所示图中有机废水中有机物可用C6H10O5表示．下列有关说法正确的是