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黄钾铁矾渣经如下流程可将其转化为锰锌铁氧体： 已知：①黄钾铁矾渣中铁主要以Fe2O3形式存在，锌主要以硫酸锌（ZnSO4）、氧化锌（ZnO）、硅酸锌（ZnSiO3）形式存在，黄钾铁矾渣的某些元素...
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高三下学期化学《》真题及答案
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机遇号火星车发回来的信息经检测火星上有针铁矿[FeOOH]和黄钾铁矾黄钾铁矾的化学式为KFe3SO4
黄钾铵铁矾不溶于水和稀硫酸制取黄钾铵铁矾的示意图如下1溶液X.是________2检验滤液中是否存在
下列哪些矿物质在孕妇膳食中强调要增加
钙、氯、钠、钾
铁、锌、铬、锰
钙、铁、锌、碘
铜、钙、碘、硒
钙、铁、锌、硒
下列哪些矿物质在孕妇膳食中强调要增加
钙、氯、钠、钾
铁、锌、铬、锰
钙、铁、锌、碘
铜、钙、碘、硒
水稻生长需要量较多的是含下列哪项的无机盐
钙、铁、锌
氮、磷、钾
锌、硼、锰
锰、钼、铝
精矿浸出的方法1常规浸出法2热酸浸出黄钾铁矾法34热酸浸出赤铁矿法
在电力和电讯工业中广泛使用的磁性材料是
铁铝合金
铝镍钴合金
硅钢片
锰锌铁氧体
在低频弱磁场下最常选用的软磁材料是
硅钢片
铁镍合金、铁铝合金及冷轧单取向硅钢薄带
锰锌铁氧体
镍锌铁氧体
一种用硫酸烧渣主要成分Fe2O3FeOFe3O4FeS2SiO2制备铵黄铁矾[NH4xFeySO4z
大量元素包括磷钾和
氮
铁
锰
锌
黄钾铵铁矾[KNH4FexSO4yOHz]不溶于水和稀硫酸制取黄钾铵铁矾的流程如下:1溶液X.是2检
以下哪些矿物质在孕妇膳食中强调要增加
钙、氯、钠、钾
铁、锌、铬、锰
钙、铁、锌、碘
铜、钙、碘、硒
钙、铁、锌、硒
黄钾铁矾渣含ZnOFe2O3及少量CuOMgO等是冶炼厂一种废渣为了综合利用减小污染可用于制备锰锌铁
步骤①中的硫酸可用浓硫酸并加热来加快反应速率
步骤②中Fe粉主要用于滤液中的Fe
3+
、Cu
2+
的还原，同时不能用NH
3
·H
2
O替换NH
4
F
步骤③涉及的离子反应为氧化还原反应
步骤④将滤液蒸发浓缩、冷却结晶、过滤可获得(NH
4
)
2
SO
4
晶体
火星探测器发回的信息表明火星上存在针铁矿[Goethite化学式FeOOH]和黄钾铁矾[Jarosi
4
5
6
7
黄钾铵铁矾[KNH4FexSO4yOHz]不溶于水和稀硫酸制取黄钾铵铁矾的流程如下1溶液X.是▲2检
下列哪组元素是人体必需的微量元素
锰、铁、碘、钴、镁
磷、硒、镍、氟、铜
钙、锌、钼、硅、铁
钒、钾、铜、铁、铝
碘、钒、铜、锌、硅
锰锌铁氧体是隐形飞机上吸收雷达波的涂料之一现以废旧锌锰电池为原料制备锰锌铁氧体的主要流程如图所示请回
锌焙砂的硫酸浸出过程中除铁的方法主要包括
黄钾铁矾法
钍铁矿法
氢氧化高铁法
赤铁矿法
下面关于铁氧体软磁材料描述正确的是
以三氧化二铁为主要成分
电阻率至少是合金的1000倍以上，相当于半导体
最常用的是锰锌铁氧体和镍锌铁氧体
适宜做成微型或薄片的永磁体
剩磁较低，磁感应强度受温度影响大，不宜用作电测仪表的永磁体
是硬磁材料常用来制造各种永久磁铁
电工纯铁
硅钢片
铝镍钴合金
锰锌铁氧体
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Shelikeswearingshortsocksanda鲜艳的dress.
使代数式有意义的x取值范围是．
计算﹣12019+×sin60°﹣﹣3．
下列说法正确的是
某公司有如图所示的甲乙丙丁四个生产基地．现决定在其中一个基地修建总仓库以方便公司对各基地生产的产品进行集中存储．已知甲乙丙丁各基地的产量之比等于4542各基地之间的距离之比abcde＝23433因条件限制只有图示中的五条运输渠道当产品的运输数量和运输路程均相等时所需的运费相等．若要使总运费最低则修建总仓库的最佳位置为
Ihavealwaysthoughtofmyselfasadoer.InworkIcertainlywasandcontinuetobe.AsamomI'mmostlyadoer.Howevermy1forbreastcancermademe2Ihadn'tbeenadoerinthewayIwantedtobe﹣butthatwasaboutto3. SinceIbecamea4andreportedmanyplanecrashesI'vebeen5offlying.Myfamilyhad6beentoanothercontinenttogether.Nowthatthechemo化疗7asagifttomyselfmykidsandmymomItookthemalltoLondonto8lifebeforebeginningradiationeveryweekdayforsixweeks. ThistimeImadea9nottothinktoomuchaboutit.Lookinginthemirrorwithouthairyoudoyourbestto10yourdayasthoughitwereaday11youdiscoveredyourlump肿瘤.Theneverythingseemsdoable.12Ijustbookedthetrip.InLondoneverydayI13adifferentadventurefromwhichmyfamilyandIlearnedmuchand14ourselves. Ihadwantedtotakea15likethisforyearsbutlifeandworkhadgottenintheway.Now16lifeandworkwehadfinallydone17.Ihavethoroughlyenjoyedfamilylearning18livingbutnothingisbetterthanknowingthatmykidsfeel19forthetrip.Onedayperhapsthey'llrealizethatsometimesthebest20comesaftersurvivingyourgreatestfears. 1A.treatment B.reason C.concern D.anxiety 2A.ignore B.imagine C.realize D.doubt 3A.happen B.continue C.change D.arise 4A.pilot B.doctor C.tourist D.journalist 5A.tired B.fond C.afraid D.proud 6A.frequently B.already C.never D.just 7A.failed B.ended C.delayed D.approached 8A.save B.create C.celebrate D.improve 9A.wish B.decision C.judgment D.conclusion 10A.lookfor B.getridof C.lookbackon D.getthrough 11A.after B.before C.until D.when 12A.But B.So C.Otherwise D.Even 13A.expected B.planned C.experienced D.described 14A.enjoyed B.taught C.introduced D.trained 15A.rest B.lesson C.risk D.trip 16A.intermsof B.owingto C.regardlessof D.inadditionto 17A.them B.it C.everything D.something 18A.for B.by C.with D.beyond 19A.grateful B.eager C.ready D.sorry 20A.work B.chances C.love D.adventures
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分解因式x2+2x+1＝．
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假定你是李华为了帮助参加一带一路交流项目的来华留学生更好的了解中国的传统文化你所在的学校决定周末组织留学生参观附近一处瓷器小镇.请给你的朋友Paul写一封邮件邀请他参加内容包括 1.写信目的 2.体验项目 3.相关事宜. 注意 词数100词左右. 可适当增加细节以使行文连贯. 参考词汇一带一路OneBeltOneRoad瓷器china DearPaul. HowiseverythinggoinghereinChina?
SowhyhasEnglishchangedovertime?1actualalllanguageschangeanddevelop2culturesmeetandcommunicatewitheachother.AtfirsttheEnglishspokeninEnglandbetweenaboutAD450and1150wasverydifferentfromtheEnglish3speaktoday.ItwasbasedmoreonGerman4theEnglishwespeakatpresent.ThengraduallybetweenaboutAD800and1150Englishbecame5littlelikeGermanbecausethosewho6ruleEnglandspokefirstDanishandlaterFrench.ThesenewsettlersenrichedtheEnglishlanguageandespecially7itvocabulary.Sobythe1600'sShakespearewasabletomakeuseof8widervocabularythaneverbefore.In1620someBritishsettlersmovedtoAmerica.Laterinthe18thcenturysomeBritishpeople9taketoAustraliatoo.Englishbegantobespokeninboth10country.
为了测量某山如图所示的高度甲在山顶A测得C处的俯角为45°D处的俯角为30°乙在山下测得CD之间的距离为400米．已知BCD在同一水平面的同一直线上求山高AB．可能用到的数据≈1.414≈1.732
Theaimoftheseexperimentswastofindtheconnectionifanybetweenthetwo现象.
下列运算正确的是
Differentweathermakespeoplefeeldifferent.Itinfluences影响healthintelligence智力andfeelings. InAugustitisveryhotandwetinthesouthernpartoftheUnitedStates1.IntheNortheastandtheMiddleWestitisveryhotatsometimesandverycoldatothertimes.PeopleinthesestateshavemorehearttroubleaftertheweatherchangesinFebruaryorMarch. Theweathercanalsoinfluenceintelligence.Forexampleina1983reportbyscientistsIQ智商ofagroupstudentswereveryhighwhenaverystrongwindcamebutafterthestrongwindtheirIQwas10%lower2.Veryhotweatherontheotherhand另一方面canmakeitlower.StudentsinmanyschoolsoftheUnitedStatesoftengetworseonexamsinthehotmonthsoftheyearJulyandAugust. Weatheralsohasastronginfluenceonpeople'sfeelings.Wintermaybeabadtimeforthinpeople.Theyusuallyfeelcoldduringthesemonths.Theymightfeelunhappyduringcoldweather3.Theyevendon'tliketooutdooractivities. Lowairpressure气压maymakepeopleforgetful4.Thereisagoodweatherforworkandhealth.Peoplefeelbestatatemperatureofabout18centigrade摄氏度. Areyoufeelingsadtiredforgetfulorunhappytoday?5. A.Itmaybetheweather'sproblem. B.Warmweathercanhaveabadeffectonhealth. C.Thewindcanhelppeoplehavehigherintelligence. D.Butfatpeoplemayhaveahardtimeinhotweather. E.Peoplemayhavehigherintelligencewhenlowairpressurecomes. F.Peopleleavemorebagsonbusesandinshopsonlow﹣pressuredays. G.Peopletherehavehearttroubleandotherkindsofhealthproblemsduringthismonth.
ScottandDanielHarryareenjoyingeverydaytaskslikeshoppingandwashingforthefirsttimefollowingtheirmovetoanaccommodation住宿supporthouseinKurwongbahnorthofBrisbanelastyear. DisabilityServicesQueensland'sStrengtheningNon﹣GovernmentOrganisationsprojectprovidedanaccommodationsupportmodelthatwouldenableresidents居住者likeDanielandScotttolivemoreindependently. Thehouseisjustoneofmanyaccommodationsupportservicesfunded资助throughtheproject.Thefive﹣bedroomhouseprovides24﹣hourcareforuptofourindividualswithcomplexneedsincludingmedicalsupport.Careandstaffinglevelsarevariedandflexibledependingoneachresident'srequirements. ScottandDanielwhohaveasevereformofDuchenneMuscularDystrophyrequire24﹣hoursupportinallactivitiesofdailyliving.Beforetheymovedtothehousetheylivedwiththeirfamily.Scottsayslivingathomewasdifficultasitplacedaphysicalandemotionalstrain负担ontheirparentswhohadtowakethemseveraltimeseachnighttorepositionthemorplacethemonbreathingmachines. WewereheavyheartedsaysScottwhoisplanningtowriteabookabouthislifeexperiences.Butourparentsnowhavealotmoretimeforthemselves.Wenowmanageourselvesonaday﹣to﹣daybasis. Danielisanenthusiasticgardenertakingcareofhisownvegetablegarden.Themensharethehousewithoneotheryoungmanandtheygotorugbyleaguegamesmeetingupwithfriends. LeedingCareAustraliaprovidesthecareserviceatKurwongbah.ManagerLeeGarnisssayssettingupthefacilities设施hasnotbeenwithoutitschallenges. ItisanunconventionalmodelofcareLeesays.ThehomeisScottandDaniel'shomehoweveritisalsoaworkplacefortheirsupportstaff.Balancingthesetworequirementshasbeenachallengeforall. Wehaveexperiencedabitofalearningphaseoverthelasttwelvemonths.HoweverbyworkingasateamwetryourbesttomeettheneedsofbothresidentsandstaffandIthinkwehaveachievedtherightbalance. 1WhatdoweknowaboutthehouseScottandDanielliveinnow? A.Itwasbuiltbytheirparents. B.Itcanaccommodatefourresidents. C.Itbelongstoagovernmentalproject. D.It'slocatedinthecenterofBrisbane. 2WhydidScottandDaniel'sparentswakeupfrequentlyatnight? A.Tohelpthemdoexercise. B.Theyweremakingalotofnoise. C.Tocheckontheirbreathing. D.Theywereunderemotionalpressure. 3HowdidScottfeelwhilelivingwithhisparents? A.Abitguilty. B.Quitehappy. C.Veryproud. D.Slightlyangry. 4Whatwasachallengewhilesettingupthefacilities? A.Lackoffund. B.Noworkplace. C.Inexperiencedstaffmembers. D.Satisfyingbothstaffandresidents'needs.
如图已知⊙O是△ABC的外接圆且BC为⊙O的直径在劣弧上取一点D使＝将△ADC沿AD对折得到△ADE连接CE． 1求证CE是⊙O的切线 2若CE＝CD劣弧的弧长为π求⊙O的半径．
假如你是李华你的好朋友苏茹在交友方面存在一些困难请根据下面的提示给她写一封信. 内容要点如下 1.要交朋友首先要做一个朋友 2.要和朋友同甘共苦患难之中的朋友才是真正的朋友 3.友谊需要时间和投入effort. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. 3.信的开头与结尾已为你拟好不计入总词数. DearSuRu Iamsorrytoknowthatyouarehavingtroubleinmakingfriends. Yours LiHua
Itisatruethatyoucan'tjudgeabookbyitscover.
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﹣2的绝对值为
Chinahasannouncedit'sabolishingitsone﹣childpolicy.Whatdifferencehasitmadestatisticallyspeaking? 400millionbirthsprevented Theone﹣childpolicyofficiallyinplacesince1979hasprevented400millionbirths.Parentshavefacedfinesandotherpunishmentsforhavingmorechildren. ThemajorityofthedecreaseinChina'sfertilityratehappenedinthe1970s.Itdroppedfrom5.8childrenperwomanin1970to2.7in1978.Despitetheone﹣childpolicytheratehadonlyfallento1.7by2013. 2128﹣babydeathsrate Sincetheone﹣childpolicywasintroducedbabygirlshavebecomemorelikelytodiethanboys. Inthe1970saccordingtotheUnitedNations60malesper1000livebirthsdiedundertheageofone.Forgirlsthefigurewas53.Inthe1980saftertheone﹣childpolicybecameofficialtherateforbothwas36.Bythe1990s26malesper1000livebirthsdiedbeforetheageofone﹣and33girls.The2000ssaw21boysper1000livebirthsdyingand28girls. 1.16boysbornforeverygirl SexuallyselectiveabortionshavebeenconsideredasamajorcauseofChina'sunusualimbalance. Gietel﹣BastenassociateprofessorinsocialpolicyatOxfordUniversitysaysthebirthsofmanygirlsarenotregisteredifparentshavebrokentherulebyhavingtwochildrenaddingofficialsoftenturnablindeye.It'sestimatedtherearenow33millionmorementhanwomeninChina. 421families WiththeageingofChina'spopulationandthecontinuationoftheone﹣childpolicya421homeisthedescriptiongiventohouseholdsinwhichtherearefourgrandparentcaredforbytwoworkingageparentswhothemselveshaveonechild. By2050it'spredictedthataquarterofChina'spopulationwillbe65orolder.Thepredicteddeclineinthenumberofpeopleofworkingageisthoughttohavepersuadedthegovernmenttodroptheone﹣childpolicy. 1Whenwasthebabydeathsrateforbothboysandgirlsequal? A.Inthe1970s. B.Inthe1980s. C.Inthe1990s. D.Inthe2000s 2Whatmakestheone﹣childpolicyabolishedaccordingtothepassage? A.Thedeclineofbirthrate. B.Theriseofbabydeathsrate. C.Thechangeoffamilystructure. D.Thedeclineofworkingagepeople. 3Thepassagesumsuptheonechildpolicyby. A.number B.example C.contrast D.analysis
YouprobablyknowwhoMarieCuriewasbutyoumaynothaveheardofRachelCarson.Oftheoutstandingladieslistedbelowwhodoyouthinkwasthemostimportantwomanofthepast100years? JaneAddams1860﹣1935 AnyonewhohaseverbeenhelpedbyasocialworkerhasJaneAddamstothank.Addamshelpedthepoorandworkedforpeace.Sheencouragedasenseofcommunity社区bycreatingsheltersandpromotingeducationandservicesforpeopleinneedIn1931AddamsbecamethefirstAmericanwomantowintheNobelPeacePrize. RachelCarson1907﹣1964 Ifitweren'tforRachelCarsontheenvironmentalmovementmightnotexisttoday.Herpopular1962bookSilentSpringraisedawarenessofthedangersofpollutionandtheharmfuleffectsofchemicalsonhumansandontheworld'slakesandoceans. SandraDayO'Connor1930﹣present WhenSandraDayO'ConnorfinishedthirdinherclassatStanfordLawSchoolin1952shecouldnotfindworkatalawfirmbecauseshewasawoman.ShebecameanArizonastatesenator参议员andin1981thefirstwomantojointheU.S.SupremeCourt.O'Connorgavethedecidingvoteinmanyimportantcasesduringher24yearsonthetopcourt. RosaParks1913﹣2005 OnDecember11955inMontgomeryAlabamaRasaParkswouldnotgiveupherseatonabustoapassenger.HersimpleactlandedParksinprison.ButitalsosetofftheMontgomerybusboycott.Itlastedformorethanayearandkickedoffthecivil﹣rightsmovement.TheonlytiredIwaswastiredofgivinginsaidParks. 1WhatisJaneAddamswell﹣﹣knownforinhistory? A.Hereffortstowinaprize. B.Herlackofpropertraininginlaw. C.Hersocialwork. D.Hercommunitybackground. 2WhatisthereasonforO'Connor'sbeingrefusedbythelawfirm? A.Herlackofpropertraininginlaw. B.Herlittleworkexperienceincourt. C.Thediscriminationagainstwomen. D.Thepoorfinancialconditions. 3Whomadeagreatcontributiontothecivil﹣rightsmovementintheUS? A.JaneAddams. B.RosaParks C.SandraDay D.RachelCarson. 4Whatcanweinferaboutthewomenmentionedinthetext? A.Theyarehighlyeducated. B.Theyaretrulycreative. C.Theyarepeace﹣lovers. D.Theyarepioneers.
已知∠AOB＝60°OC是∠AOB的平分线点D为OC上一点过D作直线DE⊥OA垂足为点E且直线DE交OB于点F如图所示．若DE＝2则DF＝．
Whenpeopleusewordsand短语differentfromthestandardlanguageitiscalledadialect.
BecausemostJapanesepeopledon'treallyliketheideaofhavingaroommatealotoftheseyoungpeopleenduplivingaloneincludingyoungwomen.WhileTokyoismuchsaferthanlargecitiesinmanyothercountriescrimesdohappenandcriminalsoftenconsideryoungwomenwholivealonetobeeasytargets. Tohelpaddressthisproblemandalsotoputthemindsoffemaletenants房客ateaseapartmentmanagementcompanyLeoPalace21hasdevelopedwhatitcallstheManontheCurtainsystem. Usingaprojector投影仪controlledbyasmartphoneManontheCurtainthrowsanoutlineofamanontoyourcurtainssothatwhenpeopleoutsidelookatyourwindowstherewillappeartobeaguyinsidethusmaskingthatyoulivealone.Ifyou'rewonderinghowthat'sbetterthanjustputtingacardboardcutout剪贴画byyourwindowManontheCurtainisfull﹣motionprojectingvideosofactualactorsforanextremelylifelikelook. Currentlythesystemhas12differentoptionsincludingsuchfrighteningroutinesasabodybuilderworkingoutwithdumbbellsandasportsfanswingingabaseballbataroundwhichseemslikeitcoulddoubleasafitnessvideothatyoucoulddoyourselftogetherwithyourshadowyprotector. Sinceit'dbeeasytoinferthatashortsetpatternisafakeeachvideoisroughly30minuteslongwithavarietyofmotions. Grantedsomeoftheoptionssuchasthemanvacuumingorplayingguitararen'tgoingtobeaseffectiveifawould﹣becriminaliscloseenoughtothewindowtonoticethelackofsound.Buttheimagesthemselvesareveryconvincing. 1Whichofthefollowingstatementsisright? A.Tokyoisacityofnocrime. B.LadiesareeasilyrobbedinJapan. C.Onlyyoungladiesenjoybeingalone. D.LeoPalace21worksonapartmentaffairs. 2WhatistrueabouttheManontheCurtainSystem? A.It'sapopularmobileAPP. B.Itcanfindcriminalbehaviors. C.Itplaysavividcartoonfortenants. D.It'smainlydesignedforfemalelivingalone. 3WhatdoweknowaboutParagraph3? A.Cutoutsarebetterthanthesystem. B.Cutoutsaren'teffectiveatall. C.Peoplemaythinkyouarenotalone. D.Youcanwatchvideoswhenalone. 4Whatcanweinferaboutthesystemfromthelastparagraph? A.Itmaybeimprovedbythecompany. B.Itsvideowilllastlonger. C.Itsmotionsaren'tvividenough. D.Itwon'tbewellreceived.
如图直线y＝4﹣x与双曲线y＝交于AB两点过B作直线BC⊥y轴垂足为C则以OA为直径的圆与直线BC的交点坐标是．
Celebrities名人likeOliviaMunnaswellasfashioncompanieslikeCucciandVersaceareamongthosewhohavebeenopposed1wearinganimalfur.NowSanFranciscohasbecomethe2largecityintheUSAtobanretailersfromsellingnewfurtotheircustomers. Thebanaimstosend3strongmessagetothefurindustry4thecrueltytheseanimalsendureforthepurposeof5becomeclothingisnotconsistentwiththevalueofthecity. AsweallknowWestHollywoodbecamethefirstAmericancity6forbidthesaleofnewfuritemsin2011andBerkeleypassedabanonthesaleoffurclothingin2017.Additionallyin2000theUKledthecharge打头阵7followbyAustraliain2004.MorerecentlytheNetherlandstheEuropeanUnion'smaproduceroffurbannedfurfarmingin2012andplanstoendmink貂farmingby2024.In2018Norwaybannedfurfarmsand8endfoxandminkfarmingby2025. Hopefullyonlywheneffortslikethesearemadetoencourage9consumetostopbuyingrealanimalfur10thelivesofanimalsbefurtherprotectedallovertheworld.
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