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小明家是种植蔬菜的专业户，他学习了初三化学后告诉父母：施用适量的氮肥可以使种植的蔬菜叶色浓绿．因此，（1）他建议其父母去买的氮肥的是 ．（填字母） A、碳酸氢铵[NH4HCO3]B、硫酸钾[K...
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小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿．因此
小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿因此1他建议
某种植蔬菜的专业户不慎用污水浇灌了蔬菜蔬菜上市销售时检测出蔬菜中铅铜铬锌等重金属含量超标这里提到的铅
原子
元素
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单质
某种植蔬菜的专业户不慎用污水浇灌了蔬菜蔬菜上市销售时检测出蔬菜中铅铜铬等重金属含量超标这里提到的铅
原子
元素
分子
单质
小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿因此1他建议
小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿因此1他建议
某种植蔬菜的专业户不慎用污水浇灌了蔬菜蔬菜上市销售时检测出蔬菜中铅铜铬锌等重金属含量超标这里提到的
原子
元素
分子
单质
小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿．因此
某种植蔬菜的专业户用污水浇灌了蔬菜蔬菜上市销售时检测出蔬菜中铅铜铬锌等重金属含量超标这里提到的铅铜铬
原子
元素
分子
单质
巴桑家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿．因此
某种植蔬菜的专业户不慎用污水浇灌了蔬菜蔬菜上市销售时检测出蔬菜中铅铜铬等重金属含量超标这里提到的铅
原子
元素
分子
单质
某园林专业户计划投资种植花卉及树木根据市场调查与预测种植树木的利润y1与投资量x成正比例关系如图①所
某种植蔬菜的专业户不慎用污水浇灌了蔬菜蔬菜上市销售时检测出蔬菜中铅铜铬等重金属含量超标这里提到的铅铜
原子
元素
分子
单质
小亮家是种植蔬菜的专业户他学习了化学肥料这一节知识后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿．
小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿因此1他建议
某园林专业户计划投资种植花卉及树木根据市场调查与预测种植树木的利润y与投资量x成正比例关系如图1所示
23.5分小明家是种植蔬菜的专业户他学习了初三化学后告诉父母施用适量的氮肥可以使种植的蔬菜叶色浓绿因
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若关于x的方程3x﹣kx+2＝0的解为2则k的值为．
甲乙丙丁四人各进行了10次射击测试他们的平均成绩相同方差分别是S甲2＝1.2S乙2＝1.1S丙2＝0.6S丁2＝0.9则射击成绩最稳定的是
解不等式组并把解集在数轴上表示出来．
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Whilestaringoutofthewindowduringaflightnoteveryonewillthinkcarefullyaboutthequestionwhyairplaneshaveroundedwindowsratherthansquareones. Overtheyearsaerospaceengineeringhasmadehugestepsinairplanetechnologymeaningplanescancarrymorepassengersandgofaster.Theplaneshavealsochangedshapetoincreasesafety﹣includingthewindows.Ascommercialairtraveltookoffinthemid﹣20thcenturyairlinecompaniesbegantoflyathigheraltitudestolowertheircost﹣theairdensity密度isloweruptherecreatinglessdrag阻力forairplanes.Howeverhigheraltitudescamewithproblemslikethefacthumanbeingscan'treallysurviveat30000feet.Tomakethatpossiblethecabinwaschangedtoacylindrical圆柱体shapetosupportthepressureinside.Butatfirstplanebuildersleftinthestandardsquarewindowsandthisexpansionmeantdisaster.ThedeHavillandCometcameintofashioninthe1950s.Withaclosedcabinitwasabletogohigherandfasterthanotheraircraft. Howeverwherethere'sacornerthere'saweakspot.Windowshavingfourcornershavefourpotentialweakspotsmakingthemlikelytocrashunderstress﹣suchasairpressure.Bycurvingthewindowthestressthatwouldeventuallybreakthewindowcornerisdistributedandthechanceofitbreakingisreduced.Roundedshapesarealsostrongerandresistdeformation变形andcanthussurvivetheextremedifferencesinpressurebetweentheinsideandoutsideoftheaircraft. Fortunatelydesignersfiguredoutthelackofdesignprettyquick.Nowwehaveniceroundedairplanewindowsthatcanresistthepressureoftravelingaltitude.Itgivesbeingabletogazeoutofyourwindowtotheworldfrom35000feetawholenewoutlookdoesn'tit? 1Whydidairlinesaimtoflyathigheraltitudes? A.Toincreasesafetyoftheplane. B.Tohelptheplanetotakeoff. C.Tosavemoneyforlessdrag. D.Tocarrymorepassengersandgofaster. 2WhatdoestheunderlinedwordsdeHavillandCometinParagraph2referto? A.Aplanet. B.Aband. C.Anaircraft. D.Adesign. 3Whichistheadvantageoftheroundedwindow? A.Itreducesthepossibilityofbreakingup. B.Itweakensthestrengthofairpressure. C.Itincreasestheairpressure. D.Ithelpstosurvivetheextremeweather. 4Wheredoesthistextcomefrom? A.Anewspaperonsafedriving. B.Amagazineonfashiondesign. C.Awebsiteonsurvivalskills. D.Asciencebookonflying.
Haveyoueverspentanafternooninthebackyardmaybegrillingorenjoyingabasketballgamewhensuddenlyyounoticethateverythinggoesquiet?Thereisanoldphrasecalmbeforethestormoftenusedinasituation﹣aquietperiodjustbeforeagreatactivityorexcitement.Accordingtoourownexperienceweknowthereisactuallycalmbeforethestorm.Butwhatcausesthiscalm?Andisitalwayscalmbeforethestorm?Let'shearwhatscientistshavetosay. Aperiodofcalmhappensinaparticularkindofstormthesimplestkindofstorm﹣asingle﹣cellthunderstorm.Inthistypeofthunderstormthereisusuallyonlyonemainupdraftwhichiswarmdampairanddrawnfromplacesneartheground.Stormsneedwarmanddampairasfuelsotheytypicallydrawthatairinfromsurroundingenvironment.Stormscandrawintheairthatfittheirneedfromalldirections﹣evenfromthedirectioninwhichthestormistraveling. Asthewarmdampairispulledintoastormsystemitleavesalow﹣pressurevacuum真空comingafter.Therisingairmeetsthecolddryairthathasalreadyexistedinthestormcloudsthusthetemperatureofthewarmdampairdropsandthewatervapour水蒸汽initchangesintotinydropsthatareapreconditionofrain.Thesedropsaccumulateandbuildonlargerparticleslikedustuntiltheygrowlargeenoughtoformraindrops. Thiswarmdampairkeepsmovingupwardsbutitbecomescooleranddrierduringitstripthroughcloud.Whenitreachesthetopofthecloudtheairgetsspitout被挤出atthetop.Thisairissentrollingoutoverthebigthunderclouds.Fromtheretheairgoesdown.Warmanddryairisrelativelystableandonceitcoversaregionthatairinturncausesthecalmbeforeastorm. Mostthunderstormsthoughdon'tstartwithcalm.That'sbecausemostareactuallygroupsofstormswithcomplexwindpatterns.There'ssomuchairmovingupanddownstormgroupsthatthecalmbeforethestormneverhappens.Insteadbeforethestormitmightbereallywindy! 1Whichbestfitsthedescriptionofaparticularkindofstorm? A.Athunderstormwithasingleshape. B.Athunderstormwithoutstrongwinds. C.Astormwithairdrawnfromeverydirection. D.Astormfueledbymovingairfromtheground. 2WhatdoestheunderlinedworditinParagraph3referto? A.Coldanddryair. B.Warmanddryair. C.Coldanddampair. D.Warmanddampair. 3Whichdoesthewritermostlikelyagreeto? A.Presenceofthecalmreliesonstableair. B.Notallthunderstormsstartwiththecalm. C.Thedriertheairisthebiggerthestormwillbe. D.Stormhappenswithoutairmovingupanddown. 4Whatisthepassagemainlyabout? A.Causesandeffectsofaheavystorm. B.Abriefdescriptionofapeacefulstorm. C.Apersonalexperienceofaheavystorm. D.Anexplanationofthecalmbeforeastorm.
已知一个多边形的内角和是1080°则这个多边形是
若一个多边形的内角和等于它的外角和则这个多边形的边数为．
对于一个函数自变量x取a时函数值y也等于a我们称a为这个函数的不动点．如果二次函数y＝x2+2x+c有两个相异的不动点x1x2且x1＜1＜x2则c的取值范围是
从﹣3．﹣lπ03这五个数中随机抽取一个数恰好是负数的概率是．
下列运算结果正确的是
阅读材料设＝x1y1＝x2y2如果∥则x1•y2＝x2•y1根据该材料填空已知＝43＝8m且∥则m＝．
岳阳市整治农村“空心房”新模式获评全国改革开放40年地方改革创新40案例．据了解我市某地区对辖区内“空心房”进行整治腾退土地1200亩用于复耕和改造其中复耕土地面积比改造土地面积多600亩． 1求复耕土地和改造土地面积各为多少亩 2该地区对需改造的土地进行合理规划因地制宜建设若干花卉园和休闲小广场要求休闲小广场总面积不超过花卉园总面积的求休闲小广场总面积最多为多少亩
从甲乙丙丁四人中选一人参加射击比赛经过三轮初赛他们的平均成绩都是9环方差分别是s甲2＝0.25克s乙2＝0.3s丙2＝0.4s丁2＝0.35你认为派谁去参赛更合适
“扫黑除恶”受到广大人民的关注某中学对部分学生就“扫黑除恶”知识的了解程度采用随机抽样调查的方式并根据收集到的信息进行统计绘制了下面两幅尚不完整的统计图请你根据统计图中所提供的信息解答下列问题 1接受问卷调查的学生共有人扇形统计图中“很了解”部分所对应扇形的圆心角为 2请补全条形统计图 3若该中学共有学生900人请根据上述调查结果估计该中学学生中对“扫黑除恶”知识达到“很了解”和“基本了解”程度的总人数．
在平面直角坐标系中将点21向右平移3个单位长度则所得的点的坐标是
如图直线a∥b∠1＝50°∠2＝40°则∠3的度数为
如图1△AOB的三个顶点AOB分别落在抛物线F1y＝x2+x的图象上点A的横坐标为﹣4点B的纵坐标为﹣2．点A在点B的左侧 1求点AB的坐标 2将△AOB绕点O逆时针旋转90°得到△A'OB'抛物线F2y＝ax2+bx+4经过A'B'两点已知点M为抛物线F2的对称轴上一定点且点A'恰好在以OM为直径的圆上连接OMA'M求△OA'M的面积 3如图2延长OB'交抛物线F2于点C连接A'C在坐标轴上是否存在点D使得以AOD为顶点的三角形与△OA'C相似．若存在请求出点D的坐标若不存在请说明理由．
如图在△ABC中∠C＝90°AC＝12AB的垂直平分线EF交AC于点D连接BD若cos∠BDC＝则BC的长是
Ourteacherstriedteachingusaboutdeathduringnursingtraining.AsastudentnurseIknewIwouldseedeathinmy1.Ihadnoideaofthe2itwouldhaveonme3. ThefirstpersonIsawdiewasanelderlymanJohnwhohadbeen4forweeks.Hisheartwas5andthehealth﹣careteamwaskeepinghimcomfortableand6hissymptoms.Hehadstoppedspeakingdaysbeforebutwasstillawakeattimesandhis7whenwespoketohimwasbeautiful. WhenIcameontothe8onemorningthenightstaffsaidhehaddeteriorated恶化overnightandhad9lefttoleave.AtrainednurseandIgavehimabedbathshavedhimandchangedhissheets.ForthenextsixhoursI10hishandandtalkedtohim.Thedoctorcameinregularlyandaskedifheneededmorepainreliefbutheseemed11mostofthetime.Heonly12openedhiseyestosmileatme.Earlyintheafternoonthenursecamebackinandwewashedhisfaceand13hishair.AsshewasjustabouttoleavetheroomshestrokedhishairandsaidOhJohnjust14.Minuteslaterhedid. Ithasbeen20yearssinceJohn'sdeath.Ihaveseen15deathsinmytimenursing.Ihaveseenstaffgofarbeyondthe16oftheirjobsto17thatapatienthasasgoodadeathaspossible.Iremembersomeoftheotherfacesbutnoneisquiteas18asJohn's.Heandtheprofessionalswhowere19himtaughtmethatit20howwetreatthosewhoaredying. 1A.life B.career C.mind D.family 2A.impact B.difference C.reflection D.affection 3A.instead B.regardless C.therefore D.however 4A.insisting B.challenging C.struggling D.recovering 5A.striking B.failing C.beating D.aging 6A.comforting B.decreasing C.disappearing D.relieving 7A.face B.eyes C.smile D.expression 8A.ward B.classroom C.hospital D.department 9A.days B.hours C.minutes D.seconds 10A.held B.reached C.hugged D.touched 11A.silent B.painful C.peaceful D.anxious 12A.frequently B.occasionally C.hardly D.easily 13A.combed B.tied C.washed D.smelt 14A.comeon B.passaway C.letgo D.goaway 15A.priceless B.constant C.considerate D.countless 16A.qualifications B.ability C.expectations D.exception 17A.pretend B.assume C.believe D.ensure 18A.beautiful B.vivid C.pale D.scary 19A.caringfor B.lookingfor C.bringingup D.cheeringup 20A.trains B.works C.influences D.matters
列方程解应用题 某列车平均提速80km/h用相同的时间该列车提速前行驶300km提速后比提速前多行驶200km求该列车提速前的平均速度．
慈氏塔位于岳阳市城西洞庭湖边是湖南省保存最好的古塔建筑之一．如图小亮的目高CD为1.7米他站在D处测得塔顶的仰角∠ACG为45°小琴的目高EF为1.5米她站在距离塔底中心B点a米远的F处测得塔顶的仰角∠AEH为62.3°．点DBF在同一水平线上参考数据sin62.3°≈0.89cos62.3°≈0.46tan62.3°≈1.9 1求小亮与塔底中心的距离BD用含a的式子表示 2若小亮与小琴相距52米求慈氏塔的高度AB．
Whilesmartphonesstandaccusedofavarietyofcrimesthesepocketcomputerscancertainlybeaforceforgood.Yourphoneisalwayswithyoumakingittheperfectdevicetopushyouintoamorebeneficialwayofliving.Herearesomeofthebestappsthatcanhelp. Habitica Habiticaturnsthegoalofforminggoodhabitsintoagamewithitsowncharactersandscoring.It'salotoffunandtheappalsoletsyoubuildhabitswithfriendsandfamily.Inadditiontoregularrepeatinghabitsyoucanaddamoregeneralto﹣dolistandtherewardsyougetcanbecustomizedtoo﹣youcouldtreatyourselftoamealoutoranextrahourofgames. SmokeFree Ifyou'vegotaspecifichabitinmindthenyou'llusuallyfindspecificappstohelplikeSmokeFree.Ifyou'redeterminedtogiveupsmokingthenthisisoneofthemostcomprehensiveappsforgivingyouthatextrapushyouneedtomakeapermanentchange.Theappoffersahostofusefulfeaturesforpeoplewantingtogosmoke﹣freeTheabilitytoseeyourprogressovertimechartsshowinghowyourhealthisimprovingday﹣by﹣dayencouragementandsomeadviceontechniquesforgivingupsmoking. MyFitnessPal YoucanfindatonofhealthandfitnessappsforyourphonebutMyFitnessPalstandsoutnotjustbecauseitiseasytousebutbecauseitmakespracticalsuggestionsforyou.Itcantakeinahostofdatafromthecalories卡路里you'retakingintothenumberofswimsyou'redoingperweekandofferreportsoncalorieconsumptionandmacronutrient大量营养素breakdown. 1WhatcanHabiticahelpyoutodo? A.Winatoughgame. B.Startalastingfriendship. C.Findafancyrestaurant. D.Developapleasanthabit. 2WhichofthefollowingcanSmokeFreeprovide? A.Thefreedomtosmoke. B.Theabilitytomakeprogress. C.Adviceonhowtoquitsmoking. D.Chartsaboutyourexcellenthealth. 3Whatcanwelearnaboutthethreeappsmentionedinthetext? A.They'recheap. B.They'repractical. C.They'refree. D.They'reinteresting.
如图抛物线y＝ax2+bxa＞0过点E80矩形ABCD的边AB在线段OE上点A在点B的左侧点CD在抛物线上∠BAD的平分线AM交BC于点M点N是CD的中点已知OA＝2且OAAD＝13． 1求抛物线的解析式 2FG分别为x轴y轴上的动点顺次连接MNGF构成四边形MNGF求四边形MNGF周长的最小值 3在x轴下方且在抛物线上是否存在点P使△ODP中OD边上的高为若存在求出点P的坐标若不存在请说明理由 4矩形ABCD不动将抛物线向右平移当平移后的抛物线与矩形的边有两个交点KL且直线KL平分矩形的面积时求抛物线平移的距离．
如图AB为⊙O的直径点P为AB延长线上的一点过点P作⊙O的切线PE切点为M过AB两点分别作PE的垂线ACBD垂足分别为CD连接AM则下列结论正确的是．写出所有正确结论的序号 ①AM平分∠CAB ②AM2＝AC•AB ③若AB＝4∠APE＝30°则的长为 ④若AC＝3BD＝1则有CM＝DM＝．
如图在菱形ABCD中点EF分别为ADCD边上的点DE＝DF求证∠1＝∠2．
已知x﹣3＝2则代数式x﹣32﹣2x﹣3+1的值为．
要使二次根式有意义则x的取值范围为．
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. LastyearZhangPingyupaidvisittoLondon.WorriedaboutthetimeavailableZhangPingyuhadmadealistofthesiteshewantedtosee.ItwastheTowerwhichshevisitedfirst.Fancy!Thissolidstonesquaretowerhadbeenremainedstandingforonethousandyears.Manynewbuildingshadexpandedaroundit.Thereforeitwasstillpartofaroyalpalaceandprisoncombined.TherefollowedStPaul'sCathedralbuiltaftertheterriblefireofLondonin1666.Itlookedsplendidlywhenfirstbuilt.WestminsterAbbeytoowasveryinteresting.ThenjustashecameoutoftheabbeyPingyuheardthefamoussoundoftheclockBigBenringoutthehour. ThenextdayPingyuwasleavingLondontoWindsorCastle.PerhapsIwillseetheQueen?shewonderedasshefallasleep.
2018年12月26日岳阳三荷机场完成首航．至此岳阳“水陆空铁”四位一体的交通格局全面形成．机场以2020年为目标年计划旅客年吞吐量为600000人次．数据600000用科学记数法表示为．
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