假如你是李华,是你校英文报纸"Teens'Life"的编辑.请你用英文为报纸写一篇介绍中国传统节日"端午节"的文章. 要点如下: 1.节日的日期; 2.节日的由来; 3.庆祝的方式. 注意: 1.词数100左右; 2.短文开头已给出,不计入总词数; 3.可适当增加细节,以使行文连贯. 参考词汇:战国时期the Warring States Period; 自杀 commit suicide; 粽子Zongzi. The Dragon Boat Festival

Isthatyourbookthelostandfoundcase?

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. TheoldsayingTheearlybirdcatchesthewormshowustheimportanceofplanningworkinghardandtryingconstant.Toachieveoutstandingresultsmostpeoplemustplanaheadandworkdiligentlytoovercomeallkindofdifficulties. Thathasbeenmyownexperienceeither.WhenIfirststartedhighschoolIseldompassedrayexamssoIneverpreparedwell.LatermyteacherMr.Blackadvisedmeplaneverythingintheadvance.Sheaskedmetostudyhardaswell.AfterayearofputtinghisadviceontopracticeIcannoweasilypassallmyexams.Therearenoshortcutstosucceed.

小圆同学对图形旋转前后的线段之间角之间的关系进行了拓展探究． 一猜测探究 在△ABC中AB＝ACM是平面内任意一点将线段AM绕点A按顺时针方向旋转与∠BAC相等的角度得到线段AN连接NB． 1如图1若M是线段BC上的任意一点请直接写出∠NAB与∠MAC的数量关系是NB与MC的数量关系是 2如图2点E是AB延长线上点若M是∠CBE内部射线BD上任意一点连接MC1中结论是否仍然成立若成立请给予证明若不成立请说明理由． 二拓展应用 如图3在△A1B1C1中A1B1＝8∠A1B1C1＝60°∠B1A1C1＝75°P是B1C1上的任意点连接A1P将A1P绕点A1按顺时针方向旋转75°得到线段A1Q连接B1Q．求线段B1Q长度的最小值．

关于x的一元二次方程ax2+bx+＝0有一个根是﹣1若二次函数y＝ax2+bx+的图象的顶点在第一象限设t＝2a+b则t的取值范围是

—Imywatch.—Look!Isthisyourwatch?lose

某饮水机的电路如右图所示． 1水沸腾前红灯亮绿灯灭加热管正常工作这时温控开关1填开关通断情况同时温控开关2闭合 2水沸腾后温控开关12同时断开此时绿灯亮红灯灭加热管不工作此时红灯不亮的根本原因是

Jealousofthekidsatschoolwhoaresmarterthanyouandseemtolearnmorequickly?Don'tworry.1 2HoweveraccordingtoarecentstudyIQcanrise﹣﹣notjustbyoneortwopointsbutbyasmanyas21points! ScientistshavefoundthatIQchangesarelinkedtochangesinpartofthebraincalledgraymatterwhichwasseentogrowandbecomedenserinthebrainsofpeoplewhoseIQsimprovedgreatly.3Oneistotrainyourshort﹣termmemory.Previousresearchhasproventhatshort﹣termmemoryisthebasisforintelligencesotryingtorecognizeorretellsomethingthatyouhaveseenorheardcanhelpraiseyouroverallbrainpower.4 Agoodnight'ssleepwillalsohelpimproveyourconcentration.5Ithelpsyoustayfocusedforlongerthenextday. Scientistshavealsofoundthatexercisehelps.Walking30minutesadayfivetimesaweekanddoingexercisewillhelpyoubecomemoreknowledgeableaswellashealthierandfitter. A.Thereareseveralwaysofincreasingyourbrain'sgraymatter. B.Yourbraindealsmoreefficientlywiththingsyoutrulylike. C.Withabitofbraintrainingthechancesarethatyoucanbeassmartastheyare. D.Somaybeit'sagoodideatogetyourbrainintrainingrightaway. E.Gettingenoughsleepislikepushingtheresetbuttoninyourbrain. F.Themoreyouworkonitthebetteryouwillbecome. G.Peopleusedtoassumethataperson'sIQwasunchangeable.

如图1抛物线顶点坐标为点C14交x轴于点A30交y轴于点B．1求抛物线和直线AB的解析式2连结CACB对称轴x=1与线段AB交于点D求△CAB的铅垂高CD及S△CAB3如图2点P是抛物线在第一象限内上的一个动点连结PAPB是否存在一点P使S△PAB=S△CAB若存在求出P点的坐标若不存在请说明理由．

如图在菱形ABCD中点E是BC的中点以C为圆心CE为半径作弧交CD于点F连接AEAF．若AB＝6∠B＝60°则阴影部分的面积为

甲乙两人周末从同一地点出发去某景点因乙临时有事甲先出发甲出发0.2小时后乙开汽车前往设甲行驶的时间为xh甲乙两人行驶的路程分别为y1km与y2km如图是y1与y2关于x的函数图象． 1求x为何值时两人相遇 2求x为何值时两人相距5km直接写出结果

计算-2+-+1×0

在测定额定电压为2.5V小灯泡电功率的分组实验中1请用笔画线代替导线将图甲中的实物电路连接完整．2小金闭合开关后发现灯泡不亮电流表无示数电压表有示数则故障可能是．排除故障后移动滑片使小灯泡正常发光此时电流表示数如图乙所示则小灯泡额定功率为W．3小华在进行实验数据处理时算出了小灯泡的平均功率如下表其他同组同学都认为这样处理数据是不合理的他们的理由应该是．

计算-5×-3+-7×-3+12×-3

如图在Rt△ABC中∠ACB＝90°AC＝BC＝1将Rt△ABC绕点A逆时针旋转30°后得到Rt△ADE点B经过的路径为则图中阴影部分的面积是

为了解我区初中学生课外阅读情况调查小组对我区这学期初中学生阅读课外书籍的册数进行了抽样调查并根据调查结果绘制成如下统计图． 根据统计图提供的信息解答下列问题 1本次抽样调查的样本容量是 2补全条形统计图 3我区共有18000名初中生估计我区初中学生这学期课外阅读超过2册的人数．

小明同学设计了如下实验方案分离NaCl和CaCl2两种白色粉末的混合物W请回答下列问题 1试剂A的化学名称是． 2操作Ⅱ需要用到除烧杯玻璃棒之外的玻璃仪器还有． 3沉淀B洗涤后加入稀盐酸的化学方程式是该反应的反应类型是．

HelosthissIDcard.

甲乙两个完全相同的杯子盛有不同浓度的盐水将同一个鸡蛋先后放入其中当鸡蛋静止时两个杯子中液面恰好相平鸡蛋所处的位置如图所示则 1甲杯底部所受的液体压强乙杯底部所受的液体压强．选填＜＝或＞下同 2鸡蛋在甲杯中受到的浮力在乙杯中受到的浮力．

如图抛物线y＝ax2+6x+c交x轴于AB两点交y轴于点C．直线y＝x﹣5经过点BC． 1求抛物线的解析式 2过点A的直线交直线BC于点M． ①当AM⊥BC时过抛物线上一动点P不与点BC重合作直线AM的平行线交直线BC于点Q若以点AMPQ为顶点的四边形是平行四边形求点P的横坐标 ②连接AC当直线AM与直线BC的夹角等于∠ACB的2倍时请直接写出点M的坐标．

We'lltrytodotheworkwithmoneyandpeople.A.less;less B.fewer;more C.more;fewer D.less;fewer

在平面直角坐标系xOy中抛物线y=2x2+mx+n经过点A0-2B34．1求抛物线的表达式及对称轴2设点B关于原点的对称点为C点D是抛物线对称轴上一动点且点D纵坐标为t记抛物线在AB之间的部分为图象G包含AB两点．①画出图象G②若直线CD与图象G有公共点结合函数图象求点D纵坐标t的取值范围．

BaCl2是一种重金属盐其水溶液具有很强的毒性若误服了BaCl2溶液可立即服用MgSO4溶液解毒为测定某BaCl2溶液的溶质质量分数现取100克BaCl2溶液不断加入MgSO4溶液反应过程中溶液总质量与加入MgSO4溶液的质量关系如图所示请回答 1P点时溶液的溶质名称是 2反应生成沉淀的最大质量为克 3求原BaCl2溶液的溶质质量分数．

84消毒液是生活中常见的物质主要用于杀菌消毒和漂白．如图为某厂家生产的84消毒液的商品标签 工业上一般用反应Cl2+2NaOH＝NaCl+NaClO+H2O生产NaClO．请回答 1计算该消毒液NaClO中氯元素的质量分数结果保留0.1%． 2生产1吨该消毒液至少需要多少千克烧碱 3某同学将50g含NaClO5%的84消毒液稀释至1%需向原溶液中加入多少克水

如图在矩形ABCDAD＝AEDF⊥AE于点F．求证AB＝DF．

1TotallyWildHotelisspecialbecauseof. A.itshighprice B.itsgoodbreakfast C.thelovelygiraffes D.theoldbuildings 2AccordingtothetextpeoplecaninKenya. A.cheeroncamelsinLamuOldTown B.havebreakfastwithzebrasinTotallyWildHotel C.seelionszebraselephantsinEastNationalPark D.watchthebrightpinkbirdsnearLakeNakuru 3willmostprobablybeinterestedinthetextabove. A.Peoplewhoenjoytravelling B.Scientistswhostudybirds C.Playerswhoaregoodatrunning D.Peoplewhohaveapainintheneck

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.作文中共有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Λ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. Thisismyfifthdayatthesummercamp.Lifeisn'texactwhatIexpected.WehavetogetupearlytomakeourbedsbeforeourteacherMissLicometoinspect.Afterbreakfastwehavesomeoffreetime.YesterdaymorningIwentfishingbuttheonlythingIcatchwasatreebranch.Intheafternoontherearedifferentactivitylikehorsebackridingandhiking.They'refunsonothingnewforme.Intheeveningeveryoneisassignedadifferenttasktogetdinnerready.YesterdayIwasinchargeofpreparethehotdogsbutIaccidentallydroppeditinthefire.Thebestpartofcampisatnightwherewesitaroundacampfireandtellstories.

IthinkBobisasmartboy.Healwayshascreateideas.

圆锥只有一个底面是一个圆锥的侧面是一个从圆锥顶点到的距离是圆锥的高．

mayhaveachancetobesuccessfulifhetrieshisbest.A. Somebody B. EverybodyC. Nobody D. None

Acolleagueofminelivesinthesamestreetasme.HedrivestoworkeverydaywhileIcyclethesamedistancealmosteveryday.ImaginemysurprisewhenIcycledtoworkonedaywentforashowerinthesportscentreandsawmyneighbourinthegymonthecyclingmachineafterdrivingtowork!Idon'tseethelogic.Itwouldbemucheasiertocycletoworksothatyouhavesomeexerciseeverydayaspartofyourdailyroutine. IwantedtopersuadethemtocycletoworksoIdidsomeresearchonafewwebsitesaboutthebenefitsofcyclingtowork.Cyclinghassomeobviousadvantagesoverdriving.Itischeaperitisbetterfortheenvironmentandyoudon'thavetofindaparkingspace.Thepointabouttheparkingspaceisanimportantoneascarparksareoftenfull.Iknowthatmycolleaguesometimesmakesa15﹣minutecarjourneytoworkandthenspends30minuteslookingforaparkingspace!Itistruethatcyclingisalittleslowerthangoingbycarbutatrushhoursitdoesn'tmakemuchdifference.Thetimeittakestocycleisgenerallyeasiertopredictthanthetimeittakestodrive.Thereasonforthisisthatwhenthereisheavytrafficpeopleonbicyclescangetpastwhilepeopleincarshavetowait. Thereareclearhealthbenefitstocyclingevenifyouonlycycleashortdistanceeachday.Accordingtooneexpertifyoucycleregularlyyoushouldbeasfitasaperson10yearsyounger.WellIam47andIstillplayfootballinateamsoIwouldsaythatthisclaimistrue.AswellasbeinggoodforyourhealthIthinkcyclingcanreducestress.IcertainlyfindthatIfeelbetterwhenIarriveatworkthanIdowhenIleavehome;andIfeelbetterwhenIgethomethanIdowhenIleavework.IalsofindthatwhenIcan'tsolveaproblematworktheansweroftencomestomewhenIamcycling.Cyclingrelaxesthemind.Iamgoingtosaytomycolleaguestwowheelsgoodfourwheelsbadeverydayuntiltheygetontheirbikes! 1Theauthorgivestheexampleofhisneighbourtoshow. A.thatit'snotlogicaltodrivetowork B.howsurprisedhewasaboutdrivingtowork C.thatcyclingisgoodforone'shealth D.thatcyclingisagooddailyexercise 2Comparedwithdrivingcyclinghasthefollowingadvantagesexceptthat. A.itischeaper B.it'sbetterfortheenvironment C.itdoesn'tneedaparkingspace D.itstimeiseasiertopredict 3Theauthorfeelsbetteraftercyclingbecauseitcan. A.makeapersonfit B.makeaperson'sstressreduced C.makeapersonyounger D.makeapersonfriendly 4Whatdoestwowheelsgoodfourwheelsbadmeaninthelastparagraph? A.Acarwithtwowheelsisbetterthanacarwithfourwheels. B.Abicyclewithtwowheelsisbetterthanabicyclewithfourwheels. C.Abicycleismuchcheaperthanacar. D.Cyclingisbetterforyourhealththanacar.

我们学化学用化学爱化学让化学知识服务于人类．下列叙述正确的是

水与人类的生产生活息息相关下列有关水的说法正确的是

化学变化有时也是五彩斑斓的下列哪些反应不涉及颜色的变化

的相反数是

如图DE∥BCBE平分∠ABC若∠1＝70°则∠CBE的度数为

氢气球下吊一小重物G在空气中做匀速直线运动若不计空气阻力和风力影响而小重物G恰能沿MN方向斜上升下图中气球和重物G在运动中所处的位置正确的是A． B． C． D．

菠菜中含有草酸将草酸晶体隔绝空气加热使其完全分解生成水和碳的氧化物．为了探究上述反应生成的碳的氧化物成分同学们提出以下猜想． 1猜想与假设 猜想一只有CO猜想二只有CO2猜想三 2某同学设计了如图1所示实验验证猜想 ①无水草酸晶体熔点较低加热到182℃便开始熔化189.5℃分解．根据此信息你应选择的加热装置为图2中填A或B ②该装置中乙的作用为末端气球的作用为 ③实验中下列操作的先后顺序是 a．点燃加热装置中的酒精灯b．点燃丙处的酒精喷灯c．检查装置气密性d．装入药品 ④若甲试管和丁试管内溶液都变浑浊丙处玻璃管内的黑色固体变成红色则猜想正确．

2018年1月墨子号量子卫星实现了距离达7600千米的洲际量子密钥分发这标志着墨子号具备了洲际量子保密通信的能力．数字7600用科学记数法表示为

Ofcourseshewasn'treallymyauntandoutoffearInevercalledherthattoherface.IonlyreferredtoherasMyAuntFanniebecausethenamealwaysmademyfatherlaughquietlyandgavemymothercausetolookstrictlyatbothofus﹣﹣﹣atmeforbeingdisrespectful失礼的ofmyelderandatmyfatherforencouragingmybadbehavior.IenjoyedbothreactionssoIlookedforeveryopportunitytoworkthenameintoasmanyconversationsaspossible. AsayoungwomanmymotherhadworkedinthekitchenofalargeVictorianfarmhouse.DuringthoseyearsmymotherhelpedAuntFannymakethebestblueberryjam蓝莓酱evertastedbyanyoneinGlenfield.Shewaswell﹣knownforherjamandforneversharingtherecipewithothers.EventhoughmymotherknewtherecipebyheartaslongasAuntFanniewasaliveshenevermadethejamwithoutAuntFannieinourkitchentodirecttheprocessandpreservethesecret. EachAugustmymotherwouldpreparemeforAuntFannie'svisit.OneyearafterIhadhelpedwiththejamprocessAuntFanniegavemeacoinandthenmademepromisethatIwouldneverspendit.Holdontothiscoinshesaidandsomedayyouwillberich.Istillhavemyveryfirstcoingiventomebymygrandmother.SoIkeptthecoininasmallboxandwaitedtobecomerich. InowhavetheblueberryjamrecipeandthecoinfromAuntFannie.Inpeople'seyesAuntFannie'ssuccessresultedfromthatsecretrecipe.Buttomeitwasjustacommonrecipe.NeitherhavetheysignificantlymademebecomearichpersonbutIkeepthemasreminderstoholdontothevaluablethingsinlife.Moneycanmakeyoufeelrichforawhilebutitistherelationshipsandthememoriesoftimespentwithfriendsandfamilythattrulyleaveyouwealthy.Andthatisafortunethatanyonecanbuild. 1WhydidtheauthoralwaysusethenameMyAuntFannieinconversations? A.ShewasfrightenedofAuntFannie. B.ShelikedAuntFannie'srecipe. C.Sheenjoyedherparents'reactions. D.ShegreatlyrespectedAuntFannie. 2Inthelastparagraphtheauthorencouragesreadersto. A.holdontothefirstcoininlife B.makeasmanyfriendsaspossible C.makemoneywiththeirownhands D.spendmoretimewithfamilyandfriends 3Whatcouldbethebesttitleforthispassage? A.TheKeytoSuccess B.BlueberryJamRecipe C.AFortuneBuiltfromaCoin D.ARelationshipofTrust

已知二次函数y=-2x2+4x+1且2≤x＜4求y的取值范围．

—WhatcolorcanIchoosemom?—It'stoyoubaby!

已知二次函数y＝ax2+bx+ca≠0的图象如图所示对称轴是直线x＝﹣1下列结论 ①abc＜0②2a+b＝0③a﹣b+c＞0④4a﹣2b+c＜0 其中正确的是

Soyouwanttodrawmoneyfromabank?Doityourself.WanttofixtheInternetconnection?Doityourself.Needaboardingcardforyourflight?Doityourself.Intheorycompaniescansavemoneybyreplacinghumanworkerswithautomatedself﹣servicesystemswhilecustomersgainmorechoicesandgetquickerservice.Surelytheexpansionofself﹣serviceintomoreandmoreareasistobewelcomed? Notnecessarily.Whenitisdonewellself﹣servicecandogoodtobothcompaniesandcustomers.Butwhendonebadly﹣whohasnotfoundthemselvestrappedinaseriesofendlesstouch﹣tonemenus?Inareaswhereself﹣serviceisonlyjuststartedthisislessofaproblem:angrycustomerscanafterallalwaystaketheirbusinesselsewhere.Butifeverybankweretopreferself﹣servicesystemscustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet.Asaresultsomebanksforexamplealreadypromisethattheirtelephone﹣bankingservicesalwaysofferthechoiceoftalkingtoahumanoperator.Butinreturnforhumanservicemanycompanieswillsimplychargemore. Anotherdisagreementtoself﹣serviceisthatwhileitsavescompaniesmoneyitdoesnotalwayssavetheircustomers'time.Inthebestcasesitdoesofcourse:checkingyourselfinattheairportcanbequickerthanqueuingormakingaphonecall.Butasmoreandmoretasksareontocustomerstheymaystarttohopeforthedaysofold﹣fashionedservice. Allofthissuggeststhattherearelimitstohowfarself﹣servicecanbetaken.Companiesthatgotoofardowntheself﹣servicerouteortodoitincorrectlyarelikelytofindthemselvesbeingpunished.Insteadabalancebetweenself﹣serviceandtraditionalformsofserviceisnecessary. 1Whatadvantagesdoestheself﹣servicetechnologycertainlybring? A.Cuttingthecostforthecompanies. B.Savingmoneyforcustomers. C.Offeringcustomersextramoney. D.Defeatingthetraditionalformsofservice. 2Whatdoesthewritermeanbysayingcustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet? A.Customerswouldbesoangrythattheykickanddamagethemachineprovidingself﹣service. B.Customerswouldnotbeabletoexpresstheirangeratthebank'sservicebyleavingthere. C.Customerswouldtrytheirbesttopersuadethebanktostopself﹣service. D.Customerswouldelectsomeleaderstohaveatalkwiththebank. 3Fromthispassagewecanseethatthewritertheuseofself﹣service. A.dislikes B.supports C.thinkshighlyof D.makescarefuljudgmenton

小明在解方程x2﹣4x﹣15＝0时他是这样求解的移项得x2﹣4x＝15两边同时加4得x2﹣4x+4＝19∴x﹣22＝19∴x﹣2＝±∴x﹣2＝±∴x1＝2+x2＝2﹣这种解方程的方法称为

下列对有关实验操作或现象的描述中错误的是

2017年9月12日天舟一号飞船与天宫二号空间实验室成功进行了对接如图是即将对接时的情境天宫二号绕地球飞行一圈约90分钟．下列说法中正确的是

在沙漠或海面上常能看到海市蜃楼现象．下列关于海市蜃楼现象解释正确的是

在研究牛顿第一定律的实验中同学们已经知道滑块在水平面上滑行的距离与它刚滑到水平面上时的速度v0有关与水平面的粗糙程度有关有些同学还认为与滑块的质量有关．下面是甲乙丙三位同学在探究滑块在水平面上滑行的距离与滑块质量是否有关课题时所设计的实验步骤请你也参与进来．他们选择的器材有质量相同粗糙程度不同的木块铁块铜块铝块各一个斜面木板钩码若干． 1实验中应控制不变． 2甲乙丙三位同学设计的实验步骤分别如下你认为符合本课题探究要求的是同学的填选项前的编号． 甲让木块从斜面的顶端由静止滑下后沿水平木板滑行观察并记录木块在水平木板上滑行的距离和木块的质量分别在木块上放上数量不等的钩码先后让其从同一斜面的顶端由静止滑下后沿同一水平木板滑行观察并记录每次木块在水平木板上滑行的距离和木块及其上钩码的质量． 乙先后让木块从同一斜面的不同高度处由静止滑下后沿同一水平木板滑行观察并记录每次木块在水平木板上滑行的距离和木块的质量． 丙先后让木块铁块铜块铝块从同一斜面的顶端由静止滑下后沿水平木板滑行观察并记录它们分别在同一水平木板上滑行的距离和它们的质量． 3下表是按符合本探究课题要求的实验步骤操作后得到的实验数据从中得出的结论是． 4如右图所示让小球从A点静止释放运动到C点时若一切外力消失则小球会沿哪条路线继续运动并写出你判断的依据．．

Where'smyruler?It'sinyourpcase.

相反数等于它本身的数是．

如图扇形的半径为3圆心角θ为120°用这个扇形围成一个圆锥的侧面所得圆锥的底面半径为．

如图1抛物线的顶点A的坐标为14抛物线与x轴相交于BC两点与y轴交于点E031求抛物线的表达式2已知点F0-3在抛物线的对称轴上是否存在一点G使得BG+FG最小如果存在求出点G的坐标如果不存在请说明理由．3如图2连接AB若点P是线段OE上的一动点过点P作线段AB的垂线分别与线段AB抛物线相交于点MN点MN都在抛物线对称轴的右侧求MN最大值

如果A1-ab+1在第三象限那么点Bab在

物质的宏观性质与微观构成的相互联系是化学特有的思维方式．下列对物质的微观解释不正确的是

—What'sthatin?—It'sabaseball.

若二元一次方程组的解为则a﹣b＝．

nameisTony.isten.he

数据0.000036用科学记数法表示正确的是

下列计算正确的是

解不等式组并写出它的所有整数解．

近日在重庆服役51年的牛角沱嘉陵江大桥开始大修了这座跨越了半个多世纪的大桥是重庆主城首座城市大桥也是市级文物保护单位．其中大桥桥面部分的施工是大修工程的重点之一主要是进行行车道板改造．工程将拆除桥面现有的混凝土行车道板更换为钢桥面板．请回答下列有关问题 1钢桥面板的主要材料合金填是或不是选择该材料的原因是填字母序号． A．密度大B．硬度大C．导热性好 2桥梁外表面由于处于潮湿和酸性大气中容易腐蚀生锈．请写出用稀硫酸清洗铁锈的化学方程式． 3如果你是桥梁维护人员请说出一种防止钢铁生锈的方法．

Soyoujustfinishedwhatyouthoughtwasagreatprojectatworkandnowyourbossislistingallthethingsyouneedtoimproveupon.1.Afterallpositivecriticism批评isakeypartofanyjob.Throughthisarticlelearnhowtoacceptcriticismanddoyourjobswell. 1.Acceptthatyouarenotperfect. Ifyoubegineachtaskthinkingthatnothingwillgowrongyou'refoolingyourself.2.Theimportantthingistolearnfromthem. 2.3. Afteryou'vefinishedandbeforeyousubmitittoyourbossbesureyou'vegoneovereverythingcarefully.Thiscanhelpyoutoavoidsillymistakesandensurethatyourbosswon'thavetobotheryouaboutminorproblems. 3.Listencarefully. 4.Takenotesandremindyourselfhowtofixtheproblem.Thisstepisthemostdifficultasitcanmeanthatonemustputone'sprideawayandadmitone'sresponsibilityinone'swork﹣relatederrors. 4.Agreewithpartofthecriticism. Whenfacedwithcriticismmostpeoplefocusonthepartofthenegativefeedbackthatmaynotbetrueandignoretherest.Thisdoesn'tsolveanyproblemsandyoudon'tlearnanything.Whenyouagreewithonepartofthecriticismyoubecomeopentolearning.5.Evenagreeingwithonesmallaspectofthecriticismwillcreateanatmosphereofteamwork.Thefocusthencanbecomehowyou'llworktogethertosolveaproblemwhichwilllessenyourfeelingofbeingattacked. A.Don'ttakeitseriously. B.Don'tgetdiscouraged. C.Youwillmakemistakes. D.Doublecheckyourwork. E.Youdon'thavetoagreewitheverything. F.Infactyouneedtimeandcouragetoprocesstheinformation. G.Neverignorecriticalcommentsoryouwillrepeatthesamemistakes.

科学研究中常常用到控制变量法转换法理想化模型类比法等科学方法．在下列研究实例中运用了转换法的是

矩形ABCD中AB＝30AD＝40连接BD点P在线段BD上且不与点B重合连接AP过点P作PE⊥AP交直线BC于点E以APPE为边作矩形APEF连接BF 1如图①当点E与点B重合时线段DP的长为直接填空 2如图②当EB＝EP时 ①求证AB＝AP ②线段DP的长为直接填空 3若AP＝26请直接写出线段BF的长．

如图抛物线y=﹣x2+bx+c与x轴交于A10B﹣30两点．1求该抛物线的解析式2在1中的抛物线上的第二象限内是否存在一点P使△PBC的面积最大若存在求出点P的坐标及△PBC的面积最大值若不存在请说明理由．

如图在▱ABCD中AB＝10AD＝6AC⊥BC．则BD＝．

圆柱有条高并且每条高都相等圆锥有条高．

一个数用科学记数法表示为2.37×105则这个数是

如图在平面直角坐标系中经过点A的双曲线y＝x＞0同时经过点B且点A在点B的左侧点A的横坐标为∠AOB＝∠OBA＝45°则k的值为．

如图直线a∥b∠1＝70°那么∠2的度数是

如图在平面直角坐标系中菱形ABCD的顶点C与原点O重合点B在y轴的正半轴上点A在反比例函数y＝x＞0k＞0的图象上点D的坐标为43． 1求反比例函数的关系式 2若将菱形ABCD沿x轴正方向平移当菱形的顶点D落在函数y＝x＞0k＞0的图象上时求菱形ABCD沿x轴正方向平移的距离． 3在x轴上是否存在一点P使|PA﹣PB|有最大值若存在请求出点P坐标若不存在请说明理由．

下列说法正确的是

假定你是李华你校英文报心理与健康栏目拟刊登一篇文章为高三备考的学生如何安排课余生活和释放心理压力提出建议.请你为此栏目写一篇英语短文要点如下: 1.高三学习的挑战和困难 2.如何安排课余生活 3.如何释放心理压力 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.开头语已为你写好. LifeinSeniorThreeisnoteasy.

小天利用手中的条形磁体做了以下小实验其中结论正确的是

江苏计划5年内全部地级市通高铁．某高铁在泰州境内的建设即将展开现有大量的沙石需要运输．泰安车队有载质量为8t10t的卡车共12辆全部车辆运输一次能运输100t沙石． 1求泰安车队载质量为8t10t的卡车各有多少辆 2随着工程的进展泰安车队需要一次运输沙石165t以上为了完成任务准备新增购这两种卡车共7辆车队有多少种购买方案请你一一求出．

氯碱工业是指用电解饱和NaCl溶液的方法来抽取NaOHCl2和H2并以它们为原料生产一系列化工产品电解饱和NaCl溶液的化学方程式为2NaCl+2H2OCl2↑+H2↑+2NaOH 请计算 1烧碱中三种元素的质量比为． 2用这种方法制备40t烧碱需要食盐的质量． 3若用25%的食盐溶液按照上述方法电解并制取40t烧碱完全电解后所得溶液的质量分数．假设生成的烧碱全溶计算时若除不尽保留1%

计算|1﹣3|﹣+﹣1+2sin30°

某种可口可乐罐的形状为圆柱形底面直径为8.5厘米高为10厘米．将18罐这种饮料按如图所示的方式放入箱内这个箱子的长宽高至少是多少

2019年第三届沈阳女子半程马拉松赛将于5月26日在沈阳市五里河公园正式开跑．比赛共设有三项A．半程21公里B．健身10公里C．迷你5公里．小明和小刚参与了该项赛事的志愿者服务工作组委会随机将志愿者分配到三个项目组请用列表法或树状图法求小明和小刚被分配到不同项目组的概率．

小明用两个不同的白炽灯做探究串联电路的电流特点实验时发现一个灯泡较亮而另一个灯泡较暗则较亮的灯泡

以下给出的几何体中主视图是矩形俯视图是圆的是

下列有关金属的说法正确的是

电能是一种方便的能源它的广泛应用形成了人类近代史上第二次技术革命．有力地推动了人类社会的发展给人类创造了巨大的财富．但如果在生产和生活中不注意安全用电会带来灾害．关于安全用电下列说法正确的是

I'velearnedseveralforeignlanguagesasanadultandwasabletolearnFrenchtofluentconversationin17days. In2005IstayedwithaFrenchfriendinaFrenchvillage.NooneinthevillagespokeEnglishandmyfriendrefusedtospeakEnglishaswell. IsetuparoutinewhereIdidthesamethingseveryday. InthemorningIpracticedwritingvocabularyfor2hours.Ibelievewritingthingsoutisthebestwaytomemorizethings. WhilewritingIwouldlistentoFrenchlearningMP3s.It'sreallyhelpfultohearotherstudentsmakemistakesthatyoucanlearnfromjustlikearegularclassroomenvironment. IhadlunchwithmyFrenchfriendseveryday.AstheyrefusedtoslowdownwhenspeakingtomeinFrenchitwastolearnortostarve! IntheafternoonIreadCharlieandtheChocolateFactoryinFrench.Readingthechildren'sbooksyoureadasachildisagreatwaytolearnnewlanguages.Firstlythelanguageusedissimpleandsecondlyknowingthestoryhelpsyoutoguessthemeaningofnewwordsandavoidusingadictionary. IspentanhourwritingbasicessaysaboutthingsthatalwaysgetaskedlikeWhereareyoufrom?Whatdoyoudo?whichIhadmyFrenchfriendcheckforerrors.Bylearningready﹣madeanswersyoupracticewhatyoulearnedandbuildupyourconfidence. Anothergoodtipistolearnthefillerwordswhichpeoplesaybetweensentencesbuthavenorealmeaningallowingyoutobuytimeinconversation. After17daysIwenttoPariswhereImetagirlinacoffeeshop.WhenItoldherIhadbeenlearningFrenchfor17dayssheinsistedthatIhadlivedinFranceforatleastayear. 1Thewritermaycomefrom. A.France B.Germany C.China D.theUSA 2WhichofthefollowingisNOTwhatthewriterdoesinlearningFrench? A.ShewrotenewFrenchwordsonebyoneagainandagaineverymorning. B.ShewouldlistentoaFrenchteachingclassbyMP3whileshewaswriting. C.Shehadsupperwithherfriendseverydaypracticetalkingwiththem. D.Shewroteanswerstosomeusualquestionstobuildupherconfidence. 3Whatisthepurposeofthewritertowritethisessay? A.Totellpeoplethatshewasaverygoodlanguagelearner. B.Tosharewithpeoplesomemethodsoflearningalanguage. C.Tokeeparecordofherexperienceoflearningalanguage. D.Totellpeoplethatitwasnoteasytolearnanewlanguage.

在购买和使用化肥时要了解化肥的性质以便合理使用．为了给农民做技术指导大海同学利用自己掌握的知识对碳酸钾硫酸铵两种化肥的相关性质做了一下探究请将下列实验报告填写完整． 【实验记录与分析】 【结论与应用】碳酸钾和硫酸铵不能混合使用原因是碳酸钾溶液呈碱性与硫酸铵混合施用产生NH3降低肥效． 【知识拓展】鉴别失去标签的碳酸钾和硫酸铵固体请你用两种不同类别的试剂一次性鉴别它们．请写出所用的试剂．

下列实验操作中错误的是

Alexis17satquietlyinthepassengerseatofherdad'scar.Shelethereyeslazilyscanthelandscapeforwildlife.Thenadeercameintoviewabout200yardsinfrontofthem.Dadthere'sadeerthere!Alexissaid.Itwasamaledeerwithsharpantlers角oneachsideofitshead. AsthecarmovedcloserAlexissawthatthedeer'sheadwasbenttowardtheground.Thensheheardascreamandsawanarmflyupnearthedeer'shead.Alexisrealizedthedeerwasattackingawoman.Suea44﹣year﹣oldmotherhadbeenoutforhermorningrun.Thedeerfollowedherandedgedcloser.IknewIwasintroubleSuesays.Shewenttopickupastickforself﹣defenseandthedeercharged.Itliftedherwithitsantlersandthrewherintotheair.Suecouldfeelbloodflewdownherleg.Withinsecondsthedeerhadpushedherofftheroad. WhenAlexisandherfatherpulledupthedeerwasthrowingSuelikeadoll.Alexislookedintothewoman'sterrifiedeyesandbeforeherfatherhadevenstoppedthecartheteenagerjumpedquicklyoutofthecarandrantowardthedeer.Iwaskickingittogetitsattentionshesays.Thenherfatherwhohadfollowedhisdaughterpushedthedeerawayfromthewomen. AlexishelpedSueintothecarandthenappliedapieceofclothtoSue'sinjuredleg.We'regoingtogetyoutoahospitalAlexissaid.Thensheheardherfathershoutloudly.Hehadbeenknockedtotheground.Alexistookholdofahammerfromthecarandrantowhereherfatherlayonhisback.Shebeatthedeer'sheadandneckbuttheblowsdidn'tscareitaway.Iwaslosingfaithshesays.AcouplemorestrikesAlexissaidherfather.Youcandoit.TurningthehammeraroundAlexisclosedhereyesandbeatthedeer'sneckwithallherstrength.Whensheopenedhereyesthedeerwasrunningaway.Alexisgotinthedriver'sseatandspedtowardthenearesthospital. AfterSuewastreatedshetearfullythankedherrescuers.Youexpectateenagegirltogetonthephoneandcallforhelpshesaysnottobeatupadeer. 1WhatwasSuedoingwhenshewasattackedbythedeer? A.Shewasdrivinghome. B.Shewasrestingontheroad. C.Shewastakingexercise. D.Shewasfeedingwildanimals. 2WhatdidAlexisdotosaveSue? A.Shepushedthedeeraway. B.Shehitthedeerwithherfeet C.Shedrovethecartohitthedeer. D.Shebeatthedeerwithahammer. 3WhichofthefollowingwordscanbestdescribeAlexis? A.Strong. B.Cruel. C.Energetic. D.Brave. 4Whatisthebesttitleforthepassage? A.AWomanWasSeriouslyInjured B.ADangerousDeerAttackedaWoman C.AGirlRescuedHerFatherSuccessfully D.ATeenagerSavedOthersfromaDeerAttack

代数式与代数式3﹣2x的和为4则x＝．

因式分解a3﹣9a＝．

如图矩形ABCD中E是BC上一点点F是点E关于点C的对称点过点F作对角线BD的平行线交DC的延长线于点H连接HE并延长与矩形的边AB对角线BD于点NM． 1试判定△BME的形状并说明理由． 2若BE＝2EC连接DE当△MED为直角三角形时求ABBC的值．

Theairinthecountrysideissomanyofthepeopleliketogothereonweekends.

如图平行四边形ABCD中A在坐标原点D在第一象限角平分线上又知AB=6AD=2求BCD的坐标．

为提高学生的阅读兴趣某学校建立了共享书架并购买了一批书籍．其中购买A种图书花费了3000元购买B种图书花费了1600元A种图书的单价是B种图书的1.5倍购买A种图书的数量比B种图书多20本． 1求A和B两种图书的单价 2书店在世界读书日进行打折促销活动所有图书都按8折销售学校当天购买了A种图书20本和B种图书25本共花费多少元

Joyce:Whatdoyouthinkoftheleadteacher'sspeech? Caroline:Ithinkitwas1interest. Joyce:2doI.IhearMikeislikelytowinalltheprizesintheexamsthisyear. Caroline:Yeshisteachersaysso.He3workhardathislessonseveryeveningformonths.HewanttogotoOxfordUniversitynextyear. Joyce:Ihopehewillrealizehisgoal. Caroline:Ihopeso.4Ithinkheworkstoohard.Ihopehe'llgooutandenjoy5forachange.HowaboutyoursonCarl? Joyce:Don'tmentionhim.Carlneverstartsstudying. Caroline:You'rejoking.IheardthatCarl6winthecompositionprize. Joyce:Youhavemade7mistake.ThatisWhiteCarl.MysonisBrownCarl.Thewhitesliveinthesamecommunity8wedo.WhiteCarlhasalwaysbeensohardworking.Hewantstobea9write.Mysonlikesgoingtotheconcert.Heonlylikessinging. Caroline:10hepracticessinginghewillbecomeasingerinthefuture. Joyce:Notallpeoplecanbecomeasinger.Idon'tthinkhehasthetalent.

电动牙刷越来越受到消费者的青睐．电动牙刷工作时能深入牙齿清洁牙缝刷毛的颤动能促进口腔的血液循环对牙龈组织有按摩效果．下表为某电动牙刷参数． 1充电时只需将牙刷放在通电的底座即可感应充电牙刷和底座之间既没有用线连接也没有金属接点安全又方便．其充电原理是． 2当牙刷正常工作时求电流大小保留小数点后两位 3根据表中信息将已经耗完电能的电池充满理论上需要多少时间 4无论用哪种牙刷刷牙都需要掌握正确的刷牙方法关于刷牙下列说法正确的有 A．每次刷牙时间约3分钟左右B．来回拉动牙刷幅度不超过一个牙位 C．刷牙时动作要用力D．3个月更换一次牙刷