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如图,已知反比例函数y=(k≠0)的图象与一次函数y=﹣x+b的图象在第一象限交于A(1,3),B(3,1)两点 (1)求反比例函数和一次函数的表达式; (2)已知点P(a,0)(a>0),过点...
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反比例函数y=的图象与一次函数y=2x+1的图象的一个交点是1k则反比例函数的解析式是_______
如图已知一次函数y1=k1x+bk1≠0与反比例函数y2=k2≠0的图象交于A.41B.n﹣2两点.
反比例函数y=的图象与一次函数y=2x+1的图象都经过点1k则反比例函数的解析式是_________
如图在平面直角坐标系中四边形ABCD是菱形B.O.在x轴负半轴上AO=tan∠AOB=一次函数y=k
已知如图一次函数y=kx+b的图象与反比例函数的图象相交于A.B两点.1利用图中条件求反比例函数和一
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如图一次函数y=ax+b的图象与反比例函数y=的图象交于M.N.两点.1求反比例函数与一次函数的解析
已知反比例函数y=k≠0与一次函数y=x的图象有交点则k的范围是______.
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已知反比例函数y=k≠0和一次函数y=x﹣6.1若一次函数与反比例函数的图象交于点P2m求m和k的值
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Generallyspeakingpeoplelikethosewhohaveagoodsenseofhumor.Sometimesatouchofhumormightwellenableustowin.Considerthecaseofayoungfriendofminewhohitatrafficjamonhiswaytoworkshortlyafterreceivinganultimatum最后通牒aboutbeinglateonthejob.AlthoughtherewasagoodreasonforBrian'sbeinglate﹣seriousillnessathome﹣hedecidedthatthisby﹣now﹣familiarexcusewouldn'tworkanylonger.Hisbosswasprobablyalreadypacingupanddownpreparingadismissalspeech.YesthebosswasasBrianenteredtheofficeat935.Theplacewasasquietasalockerroom更衣室everyonewashardatwork.Brian'sbosscameuptohim.SuddenlyBrianforcedasmileandstretchedouthishand.'Howdoyoudo!'hesaid.'I'mBrian.I'mapplyingforajobwhichIunderstandbecameavailablejust35minutesago.Doesn'ttheearlybirdgettheworm?'Theroomexplodedinlaughter.Thebossclampedoffasmileandwalkedbacktohisoffice.Brianhadsavedhisjobwiththeonlytoolthatcouldwin﹣alaugh.Humorisamosteffectiveyetfrequentlyneglectedmeansofhandlingthedifficultsituationsinourlives.Itcanbeusedforpatchingupdifferencesapologizingsaying'no'criticizinggettingtheotherfellowtodowhatyouwantwithouthislosingface.Forsomejobsit'stheonlytoolthatcansucceed.Itisawaytodiscusssubjectssosensitivethatseriousdialogmaystartaquarrel.Forexamplemanybelievethatcomediansontelevisionaredoingmoretodayforracialandreligioustolerance忍受力thanpeopleinanyotherforum.1Brianwaslateforhisjobbecause.A.hegotuplateB.hewasseriouslyillC.hewascaughtinatrafficjamD.hewasbusyapplyingforanewjob2Whatcanweinferabouthumor?A.Itistheearlybird.B.Itisimportantinourlives.C.Brianoftensavedhisjobwithhumor.D.Itcansolveracialdiscriminations.3Whatdoestheunderlinedphrase'clampedoff'inParagraph3referto?A.chargeB.triedtosetC.gaveupD.triedtoholdback4Whatcanwelearnfromthetext?A.Manypeoplelackinasenseofhumor.B.Brianwassupposedtoarriveathisofficeat830.C.Itwasn'tthefirsttimethatBriancamelateforwork.D.Humoristhemostinterestingwayofsolvingproblems.
ChinesetennislegendLiNawillbeinductedintotheInternationalTennisHallofFame.1amazingLiisthefirstAsianplayer2receivethesport'sultimatehonor.ShewasjoinedbyMaryPierceandYevgenyKafelnikovforthehallsClassof2019which3announceattheAustralianOpenlastmonth.Liretiredin2014becauseofrecurringkneeinjurieseightmonthsafterwinningthatyear'sAustralianOpenand4risetoacareer﹣highsecondintheWTAranking.HerfirstGrandSlamtrophycameatthe2011FrenchOpen5shedefeatedfourtop﹣106opponentalongtheway.To7shecreditthoseon﹣courtachievementsalongwithL'sengaging8personalhelpedspurinterestintennisathomeinChina.'IhavelovedseeingthesportgrowinChina'Lisaidin9statement'andI'mproudtobepartofthathistory.'Theformalinductionceremonywillbeheld10July20thinRhodeIsland.
Takingcareofyourselfisnotbeingselfish.Bycaringenoughto1yourbodywellyouwillbein2shapetotakecareofthosearoundyou.Noonecantakecareofyourhealth3yourself.Believeinyourselfandyour4.Havea'can﹣do'attitude.Makealistof5changesthatyouhavemadeinthepast.Itiseasierto6agoalwhenyouare7.Usehumorandlaughoffoccasionallapses过失.Haveconfidencethatyoucangetbackontrackwithyourhealthy8.Seekoutafriendorco﹣workerwhowillmakeyoufeelcomfortable.Youwillfindout9friendsisahappythingintheworld.Regularphonecallsemailsorvisitovercoffeecouldhelpyoukeepagoodcontactwiththem.10yourcheerleadercouldbecomeyourexercisebuddy密友.11yourselfasyoumakesimplechangesthatintheendwill12inachievingyouroverallgoal.Celebrationispartofsuccessfulchange.Createalistofincentives动机thatwill13youmotivated.Adopteatingandphysicalactivityhabitsthatcanbecomepartofyour14.Haveabackupplan15thosedayswhenyourplanstoeatwellandbeactivearechallenged.Ifyoucan'twalk16theweatherhaveanexercisevideotouse.Ifyouhavenotimetopacka17lunchchooseasmallfastfoodsandwichandsidesalad.Goona18.Workandfamilyaretwomostimportantthingsinpeople'slives.Peopletrytotacklethetwothingsatonce19mostofthemfail.JustasanoldsayinggoesPeoplewhoknowhowtorest20howtowork.Gooutwithyourfamilyandhaveagoodtime.1A.see B.take C.use D.treat2A.better B.worse C.bigger D.smaller3A.besides B.except C.beside D.beyond4A.body B.attitude C.ability D.eyes5A.successful B.little C.strange D.few6A.check B.discover C.achieve D.declare7A.optional B.particular C.dynamic D.optimistic8A.work B.routine C.face D.sight9A.taking B.making C.sharing D.playing10A.Surely B.Quickly C.Perhaps D.Slowly11A.Reward B.Pick C.Pass D.Instruct12A.introduce B.gain C.find D.result13A.found B.pass C.build D.keep14A.family B.friendship C.object D.lifestyle15A.to B.on C.for D.outside16A.outof B.dueto C.awayfrom D.onto17A.healthy B.rich C.interesting D.passive18A.trip B.talk C.story D.meeting19A.and B.but C.because D.though20A.study B.accept C.know D.discuss
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研究有机化合物的组成结构分类有利于全面认识其性质. ①下列有机化合物属于芳香烃的是填字母. ②下列有机化合物不能与NaOH溶液反应的是填字母. a.乙醇b.苯酚c.甘氨酸 ③下列有机化合物既能发生酯化反应又能发生银镜反应的是填字母. a.HCOOCH2CH3b.CH3CH2Brc.
下列变化中只涉及物理变化的是
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现有硫酸铁硫酸亚铁和硫酸混合溶液200mL现将其分成两等份往其中一份中滴加足量BaCl2溶液产生25.63g白色沉淀往另一份中投入足量铁片放出1.12L气体标准状况下.下列判断不正确的是
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石油分馏得到的轻汽油可在Pt催化下脱氢环化逐步转化为芳香烃.以链烃A为原料合成两种高分子材料的路线如图 已知以下信息 ①B的核磁共振氢谱中只有一组峰G为一氯代烃. ②R﹣X+R′﹣XR﹣R′X为卤素原子RR′为烃基 回答以下问题 1B的化学名称为E的结构简式为. 2G生成H的化学方程式为. 3J的结构简式为. 4F合成丁苯橡胶的化学方程式为. 5I的同分异构体中能同时满足下列条件的共有种不含立体异构. ①能与饱和NaHCO3溶液反应产生气体 ②既能发生银镜反应又能发生水解反应. 其中核磁共振氢谱为4组峰且面积比为6211的是写出其中一种的结构简式. 6参照上述合成路线以2﹣甲基己烷和一氯甲烷为原料无机试剂任选设计制备化合物E的合成路线.
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亚氯酸钠NaClO2是一种重要漂白剂某探究小组开展如下实验回答下列问题 实验Ⅰ制取NaClO2晶体按如图装置进行制取. 已知NaClO2饱和溶液在低于38℃时析出NaClO2•3H2O高于38℃时析出NaClO2高于60℃时NaClO2分解成NaClO3和NaCl. 1已知装置B中的产物有ClO2气体装置B中反应后的溶液中阴离子除了ClO2﹣ClO3﹣Cl﹣ClO﹣OH﹣外还可能含有的一种阴离子是检验该离子的方法是. 2请补充从装置D反应后的溶液中获得NaClO2晶体的操作步骤. ①减压55℃蒸发结晶②③用38℃~60℃热水洗涤④低于60℃干燥得到成品并转移产品.操作的四个步骤中都用到的玻璃仪器是. 3D中用冷水浴其目的是回答一点即可. 实验Ⅱ样品杂质分析与纯度测定 4测定样品中NaClO2的纯度.测定时进行如下实验 ①准确称0.4000g样品加入适量蒸馏水和过量的KI晶体和硫酸发生如下反应ClO2﹣+4I﹣+4H+═2H2O+2I2+Cl﹣ ②将所得混合液稀释成100mL待测溶液.取25.00mL待测溶液加入淀粉溶液做指示剂用0.200mol•L﹣1Na2S2O3标准液滴定至终点测得消耗标准溶液体积的平均值为15.00mL已知I2+2S2O32﹣═2I﹣+S4O62﹣. 判定滴定到终点的标准是 请计算所称取的样品中NaClO2的质量分数并写出计算过程.
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AprimaryschoolprincipalinnorthChinahasbecomethelatestinternetcelebrityforbustingsomecoolmovesduringamorningexerciseroutinewithhisstudents.Everymoming40﹣year﹣oldprincipalZhangPengfeiattheXiGuanPrimarySchoolinLinyicountyShanxiprovincewouldleadabout700pupilsontheplaygroundinasynchronised'ghostshuffle'routine﹣adancethatincorporatescontemporaryjazzstepswithheeltoeandarmmovements.Theboldheadmasterthoughtthefunandenergeticexerciseroutinewouldbetterencouragestudentstogetactiveinsteadof'beinggluedtotheirmobilephones'.Theschool'snew30﹣minutedanceroutinehasreplacedthegovernment﹣imposedbroadcastcallisthenicsprogrammeashortworkoutthathasbeenarequirementateveryprimarymiddleandsecondaryschoolinChinasince1951.'Ithoughtweneededachangebecausethestudentshavebeenlosinginterestindoingthebroadcastcallisthenicsroutine'ZhangtoldSouthernMetropolisNews.Thededicatedprincipalsaidhecameacrossagroupofpeopledoingthe'ghostshuffle'routineatapublicplazalastsummeranddecidedtoleamthedancehimself.'Ithoughtthedancewouldbegreatforkids'hesaid.'Themusicisfullofenergyanditreallygetsthehappyfeelingofflowing.'InOctober.heintroducedthechoreographed编舞routinetoallofhisstudentsandshortlyaftereventeachersandstaffwerejoiningin.'Nowthestudentsaren'tconstantlyontheirphones.Isometimescatchthemwatchingdifferentdanceroutinevideosandlearningnewmoves!'theproudheadmastertoldreporters.ThevideoquicklywentaroundonChinesesocialmediawithaWeibotopicpagetitled'principalleadsstudentsinghostdanceroutine'gathering250millionviews.'Thisisperhapsthebestadaptionofsportandentertainmentforchildren.'acommentonWeiboread.1Whatcanweknowfromthepassage?A.ZhangPengfeiisaprimaryschoolprincipalinsouthChina.B.XiGuanPrimaryschool'snew30﹣minutedanceroutineisbothfunandenergetic.C.DoingthebroadcastcallisthenicsroutineisonlyrequiredatprimaryschoolsinChina.D.FewpeopleshowedinterestinZhangPengfei'sghostdanceroutinevideoonWeibo.2Whatcanweinferfromthelastparagraph?A.Pepoleholdacriticalattitudetowardstheadaptation.B.Pepoleholdanindifferentattitudetowardstheadaptation.C.Pepoleholdanegativeattitudetowardstheadaptation.D.Pepoleholdasupportiveattitudetowardstheadaptation.3Whichofthefollowingcanbethehesttitleforthepassage?A.AfamousprimaryschoolprincipalZhangPengfeiB.TraditionalcalisthenicsprogrammesinChinaC.AChineseprincipalleadsstudEntsinghostdanceroutineD.AninternetcelebrityinChina4Fromwhichpartofamagazinecanwereadthispassage?A.AgricultureB.TechnologyC.EconomyD.Education
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用下列实验装置完成对应的实验部分仪器略去能达到实验目的是
Fromaninnocentchildren'scartooncharactertoatopculturaliconPeppaPigaBritishpreschoolanimatedTVserieshasundergoneanamazingjourneyinadaptingtoChinesecultureandChina'smarket.2015InJunethePeppaPigTVserieswasintroducedtotheChinesemarketbyEntertainmentOneandfirstairedontheCCTVChildren'sChannel.ShortlyafteritspublicationPeppaPigattractedbillionsofviewsonsocialmediaplatformslikeiQiyiYoukuandTudou.2016ThePeppaPigTVserieswasbroadcastontheCCTVChildren'sChannelforasecondround.ItalsogainedmoreviewersontheGoldenEagleAnimationChannelHunanTV.2017Thephrase'PeppaPigGirl'becameoneofthehottestbuzzwordsonChina'sInternet.Itreferstoagirlwhoholdsapositiveattitudetowardlifeeventhoughshetendstobelazyinherdailylife.Shemightlookabitsillyandoftenhavetastyfoodasatoppriorityonhermind.2018RumorsclaimedthatPeppaPigwasbannedfromDouyinChina'smajorvideosharingplatformsayingit'violates违反thecommunityregulationsandhasnotpassedcensorship审查制度'.InMayhoweverrepresentativesfromDouyinsaidtheappwasnotforbiddingPeppaPig.2019AccordingtoEntertainmentOnemorethan40millionPeppaPigbookshavebeensoldsinceitssecondroundbroadcastonCCTV.IntheyearofthePigmorecompaniesareaddingPeppa﹣themedelementstotheirproductsforpromotion.1Sincemorethan40millionPeppaPigbookshavebeensold.A.2015B.2016C.2017D.20182Whatdoesthepassagemainlytalkabout?A.PeppaPigsjourneytobecomeaChineseculturalimage.B.PeppaPigshigheconomicvalueinChina.C.ThecausesofthegreatpopularityofPeppaPigTVseries.D.TheIntroductionofPeppaPigtothewholeworld.3WhatcanweleanaboutPeppaPigaccordingtothepassage?A.TheTVserieswasfirstbroadcastonHunanTV.B.FoodisthefavoriteofaPeppaPigGirlwhoissilly.C.YearofthePigwillhelppromotethesalesofthePeppa﹣themedproducts.D.PeppaPigwasbannedinDouyinbecauseitbrokethelaw.
Manyyouthswanttoleanhowtodrivecars.ThisyearonesixthofundergraduatesinBeijinghaveregisteredatdrivingschool.Thestudentsmostlyfrommajorssuchasbusinessmanagementorimitationaltradewillfinishtheirdrivingcourseswithin20daysorso.Trainingcostshavedroppedto4500yuanforstudentsaccordingtotheHaidianDrivingSchoolinBeijing.Thepriceisnotreallylowbutstudentswillacceptitseeingitasaninvestment投资intheirfuture.FamiliaritywiththeoperationofcomputersandfluentEnglisharethebasicskillsgraduatingstudentsneedtofindajob.Butadriverspermithasbecomeanotherfactor因素.'Inthejobmarketowningadriver'spermitsometimesstrengthensagraduatingstudent'scompetitivenessforagoodposition'saysLiHuaanundergraduateattheChinaUniversityofPoliticalScienceandlaw.Carswillbecomeanecessarypartofmanypeople'slivesinthecomingyearsanditisdifficulttogetapermitoutofcampusbecauseofthepressuresonworkingpeople'stime.'Havingafull﹣timejobaftergraduationofferslimitedtimetolearntodrive.Weseniorstudentshaveplentyofsparetimeplentyofoppurtunitytolearn'saysanotherundergraduateattheuniversity.WuDonganofficialatthedrivingschoolsaidundergraduateswereveryableandseriousandcouldgraspinanhourwhatordinarypeopletookfourhourstolearn.Inthisdrivingschoolmiddle﹣agedpeopleyoungwomenandcollegestudentsarethemaincustomers.FromMarch12018togetadriver'spermitabeginnerisnowrequiredtohaveatleast86hours'practicebeforethefinalroadtest.1Whydotheundergraduateslearntodrive?A.Theyarethestudentsfromspecialsubjectorcourse.B.Theyliketodrivecarsverymuch.C.Theywantybecomefulltimedriversaftergraduation.D.Theyneedthisskilltofindagoodjobinthefuture.2WhatisWuDong'sopinionofstudentslearningtodrive?A.Itwouldmakethelifemoreinteresting.B.Youthswouldhaveanadvantageinlearningtodrive.C.Itisawasteofmoneyandtimetolearntodrive.D.Itwouldbebettertolearnitatcollegethanatwork.3Togetthepermitthestudent.A.requiressometimetopracticebeforethefinalroadtestB.mustpaymoremoneybeforethefinalroadtestC.mustpracticemoretolearntodrivewhenhavingajobD.requirestolearnsomemoreothersubjectstodrive
有人认为“脚臭盐”异味是由隐藏在岩盐矿床中极少量的丙酸丁酸等短链脂肪酸造成.丙酸分子式为C3H6O2丙酸属于
图为锌一铜原电池示意图下列说法错误的是
下列反应的离子方程式书写正确的是
下列实验装置或操作正确的是
Flextimeisaflexiblehoursscheduleinwhichemployeeschoosetheirownworkinghoursusuallyworkingwithinapproximatelimitssetbytheemployerorbythegovernment.1oremployeesflextimehasaclearadvantage.2Forexamplepeoplecanuseflextimetocreatescheduleswhichwillallowthemtogotoschoolhandlechildcareassistrelativesandperformothertasks.Employeesmayalsousetheirflextimetocreateaschedulewhichoptimizescreativityasinthecaseofsomeonewhowouldprefertoworkearlierinthedaytogetmoreaccomplished.3Firstittendstoincreaseemployees'satisfaction.Thismakesthecompanyabetterandmoreproductiveplacetowork.Inadditionflextimecanallowcompaniestoserveclientsforagreatportionofthedayasemployeeswillbearoundatvaryinghourstoanswerphonesattendmeetingsandsoforth.Mostflextimeschedulesincludecoretime.4EmployeesarealsousuallygivenanhourlydailyorweeklylimittoensurethattheydonotviolatelawsaboutworkinghoursOrthecompanyisonlywillingtopaywagesforsomanyhoursofworkeachweek.Aclassicexampleofaflexibletimescheduleisthatsomeonewhoworksfour10﹣hourshiftsaweekcantakethreedaysoff.Flextimecanalsobecombinedwithflexplaceinwhichtheenvironmentisbetterthanthatoftheoffice.5Employersmayalsoallowpeopletoworkinuntraditionalsettingssuchascoffeehouses.A.Employersbenefitfromflextimealot.B.It'salsoseenasafamily﹣friendlypolicy.C.Howeverflextimemaynotbeapplicabletoallfields.D.Itisaperiodofthedayinwhicheveryoneisexpectedtobeatwork.E.Manyemployersallovertheworldofferthismethodtotheiremployees.F.Forexamplehomeofficesareincreasinglypopularamongmanycompanies.G.Itallowsthemtomakechangestotheirworkschedulewhichwillsuittheirlives.
超顺磁性的Fe3O4粒子粒子平均直径为25nm在医疗上有重要作用.实验室制备方法如下在有N2保护和剧烈搅拌条件下向FeCl3FeCl2混合溶液中滴加氨水可得到黑色的Fe3O4.实验装置如图. 请回答下列问题 1恒压滴液漏斗的优点是. 2充N2的目的是反应温度应控制在50℃加热方法为. 3制备超顺磁性Fe3O4粒子反应原理的离子方程式为. 4充分反应后将三颈烧瓶中的混合物通过离心分离然后水洗最后用无水乙醇洗涤用无水乙醇洗涤的优点是为了验证得到的固体是超顺磁性的Fe3O4粒子实验操作.为了检验超顺磁性粒子中含有+2价的铁需要的化学试剂为填代号. A.KSCN溶液B.HCl溶液C.H2O2溶液D.K3[FeCN6]溶液 5实验制得的超顺磁性的Fe3O4粒子中含有少量的FeOH3为测得Fe3O4的含量称取mg试样放在小烧杯中用足量稀硫酸溶解后定容于100mL容量瓶中准确量取其中的20.00mL溶液置于锥形瓶中然后用cmol/L的KMnO4溶液进行滴定当停止滴定然后重复二次滴定平均消耗KMnO4溶液VmL该样品的纯度为.已知MnO4﹣+5Fe2++8H+=Mn2++5Fe3++4H2O
铝热法是一种利用铝的还原性获得高熔点金属单质的方法反应的化学方程式为2Al+Fe2O3Al2O3+2Fe.下列说法不正确的是
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