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下列实验操作、现象和结论均正确的是( )
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下列实验操作实验现象和实验结论均正确的是
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某研究小组成员在讨论鉴别浓硫酸和稀硫酸的方案时设计如下方案1其中操作方法和现象及结论均正确的是___
.实验室有一瓶食盐水和一瓶硬水请加以区分请说出实验操作方法现象和结论操作______________
下列有关实验操作实验现象和所得结论均正确的是
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由下列实验操作得出的实验现象和实验结论均正确的是
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下列实验操作实验现象和实验结论均正确的一组是
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下列实验操作实验现象和实验结论均正确的是
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下列实验操作现象和实验结论均正确的是
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下列实验操作对应的实验现象和结论均正确的是
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下列实验操作和现象与结论对应关系正确的是
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下列实验操作实验现象和实验结论均正确的是
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下列实验操作实验现象和实验结论均正确的是
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下列实验中实验操作实验现象和实验结论均正确的一组是
下列实验操作实验现象和实验结论均正确的是
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下列实验操作现象和对应的实验结论均正确的是
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下列实验操作实验现象和实验结论均正确的是
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2018年·吉大附中四模下列实验操作实验现象和实验结论均正确的是
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如图过椭圆的左焦点F1作x轴的垂线交椭圆于点P 点A和点B分别为椭圆的右顶点和上顶点OP∥AB. 1求椭圆的离心率e 2过右焦点F2作一条弦QR使QR⊥AB.若△F1QR的面积为求椭圆的方程.
抛掷甲乙两颗骰子若事件A“甲骰子的点数大于4”事件B“甲乙两骰子的点数之和等于7”则PB|A的值等于
关于物理概念的建立和物理规律的形成下列说法不正确的是
设随机变量ξ的概率分布列为Pξ=k=k=0123则Pξ=2=.
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若定义在[-1+∞上的函数fx=则=.
2017年5月14日第一届“一带一路”国际高峰论坛在北京举行为了解不同年龄的人对“一带一路”关注程度某机构随机抽取了年龄在15-75岁之间的100人进行调查经统计“青少年”与“中老年”的人数之比为911. 1根据已知条件完成上面的2×2列联表并判断能否有99%的把握认为关注“一带一路”是否和年龄段有关 2现从抽取的青少年中采用分层抽样的办法选取9人进行问卷调查.在这9人中再选取3人进行面对面询问记选取的3人中关注“一带一路”的人数为X求X的分布列及数学期望. 附参考公式其中n=a+b+c+d 临界值表
如图倾角为θ的绝缘斜面ABC置于粗糙的水平地面上一质量为m带电量+q的小物块可看作是点电荷恰好能在斜面上匀速下滑若在AB中点D的上方与B等高的位置固定一带电量+Q的点电荷再让物块以某一速度从斜面上滑下物块在下滑至底端的过程中斜面保持静止不动在不考虑空气阻力和物块电荷没有转移的情况下关于在物块下滑过程的分析正确的是
如上图所示水平轻弹簧与物体A和B相连放在光滑水平面上处于静止状态物体A的质量为m物体B的质量为M且M>m.现用大小相等的水平恒力F1F2拉A和B从它们开始运动到弹簧第一次最长的过程中
设抛物线y2=6x的焦点为F准线为lP为抛物线上一点PA丄l垂足为A如果△APF为正三角形那么|PF|等于
已知函数fx=x2-ax+lnxa∈R. 1若fx在定义域上不单调求a的取值范围 2设amn分别是fx的极大值和极小值且S=m-n求S的取值范围.
Alice'sparentsdonotapproveofherplanwhichcanbefromtheirsilence. A.differentiated B.excluded C.induced D.deduced
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﹣Wouldyoumindholdingthedooropenforme? ﹣Oh. A.withpleasure B.nevermind C.it'smypleasure D.that'sright
Itispromotedthatweshouldallprioritizesomesimplerlifeimprovementstolivebetterlives.Theexplanationsforhowandwhytheybetterourlifeserveaspowerfulremindersthatwemightbeprioritizingthewrongthingsandundervaluingwhatmakeslifeworthliving. Smokingdrinkingexerciseandevenheartproblemsarenotpredictorsofaperson'slongevity﹣aperson'scloserelationshipsandsocialintegrationaie.Ourhumanconnectionshavethepositiveimpactonallaspectsofourwell﹣beingincludingourphysicalhealth.Thosewithintimacy亲昵intheirlivesandthosewithfrequentface﹣to﹣faceinteractionswerenotonlyphysicallyandemotionallyhealthierbuttheyalsolivedlonger. It'swhywomenwhotendtoprioritizespendingtimewiththeirfriendsmorethanmenliveanaverageofsixyearslonger.It'snotenoughtotextoremail.Theactualhealthbenefitsofsocializingareonlyachievedtlvoughin﹣personcontactbecausefece﹣to﹣facecontactreleaseschemicalsthatprotectyounowandwellintothefuturelikeavaccine. Peoplewhospendtimeonsocialnetworksdatingappsandevenonlinenewssitesarefoundlesshappy.MostthingswedoforpleasurelikereadingabookorwatchingamoviehaveanendButscrolling卷动onthephoneisendlessandwedon'tknowwhentobreakaway.Andthosewhodosetlimitingrulesfortheirtechnologyuseareabletoenjoylifemore.Lifebecomesmorecolorfulricherwhenyouhavebetterconversationswiththepersonwhoistherewithyou. Thechaseforhappinessdoesn'tmakeushappy.Infactconstantlyevaluatingourownhappinessisactuallycontributingtofeelingsofhopelessnessanddepression.Happinessisafickle变幻无常的emotionbasedonamomentoranexperience.It'snotalackofhappinessbutlackofmeaningthat'sreallymakingusfeelsad. Meaningcanbeobtainedinfourformsbelongingpurposetranscendence卓越andstorytelling.Thefirstishavingpeopleinyourlifewhotrulyloveandcareaboutyou.Thesecondishavingpurpose.Mostpeoplefindpurposethroughworkbecauseit'showwe﹣feellikewe'readdingvalueorcontributing.Sofindingsomethingtodriveyouforwardisacrucialsliceofhavingnieaning.Transcendenceisaboutfindingsomethinglikeartorchurchordoingyogathatcantakeyououtsideofyourselfthatcanmakeyoufeellikeyou'repartofsomethingbigger.Withstorytellingthat'sallaboutourpersonalnarratives.We'retheauthorofourstoriesandwecanchangehowwe'retellingthem.Yourlifeisn'tjustalistofevents. 7172737475 7677787980.
Howcantheconsulate领事馆helpme? TheChinesegovernmenthasclaimedtoprotectthelegalrightsofitsChinesenationalsoverseas.TheForeignMinistryhassetupanaround﹣the﹣clockhotline12308toprovideconsularprotectionservicesforChinesenationals. HerearesomeoccasionsonwhichyoucanreceiveassistancefromthelocalChineseconsularmission. 56.WhomdoChineseconsulatesprotect? A.Foreigners. B.Localcitizens. C.Chineseabroad. D.ChineseAmericans. 57.Youcanseekhelpabroadfromtheconsulatewhen A.yourbelongingsaredestroyed B.yougetabusedinthefamily C.youexperienceacaraccident D.youarrangemeansoftransport.
若复数z满足1+iz=|+i|则在复平面内z对应的点位于
深入研究碳元素的化合物有重要意义回答下列问题 1CH4﹣CO2催化重整反应为CH4g+CO2g⇌2COg+2H2g. 已知Cs+2H2g=CH4g△H=﹣76kJ•mol﹣1 Cs+O2g=CO2g△H=﹣394kJ•mol﹣1 2Cs+O2g=2COg△H=﹣222kJ•mol﹣1 该催化重整反应的△H=kJ•mol﹣1 2工业上可以通过反应COg+2H2g⇌CH3OHg制备甲醇.在一容积可变容器中充入2molCO和4molH2CO的平衡转化率随温度T压强P的变化关系如图所示.该反应的△H0填“>”“<”或“=”比较A点时用CO表示的正反应速率与B点时用CH3OH表示的逆反应速率的大小v正COv逆CH3OH填“>”“<”或“=”.若在压强P1下达到化学平衡状态A时容器的体积为10L.如果反应开始时仍充入2molCO和4molH2则在压强P2下达到平衡状态B时容器的体积VB=L. 3氯化铵可作除锈剂的原理是用离子方程式表示 4常温下测得某CaCO3的饱和溶液pH=10.0忽略CO32﹣的第二步水解计算KspCaCO3=已知Ka1H2CO3=4.4×10﹣7Ka2H2CO3=5.0×10﹣11 5有一种可充电电池Na﹣Fe/FeS电池工作时Na+的物质的量保持不变并且用含Na+的导电固体作为电解质已知该电池的正极反应式为2Na++FeS+2e﹣=Na2S+Fe该电池充电时当转移1mol电子时阳极质量的变化量为g.
Whilethesuppliescanmeetourcurrentdemandtheycanlastamonth. A.atcommand B.atlength C.atrandom D.atbest
亚硝酰氯ClNO是有机物合成中的重要试剂可由NO与Cl2在常温常压下反应得到.ClNO部分性质如下黄色气体熔点﹣59.6℃沸点﹣6.4℃遇水易水解.已知HNO2既有氧化性又有还原性AgNO2微溶于水能溶于硝酸AgNO2+HNO3=AgNO3+HNO2. 1利用ⅠⅡⅢ装置制备原料气NO和Cl2 ①写出利用装置Ⅰ制备氯气时导管A的作用. ②利用上述装置制备NO时Ⅱ中盛装物质为水其作用是. 2利用以下装置在常温常压下制备ClNO ①装置连接顺序为a→按气流自左向右方向用小写字母表示. ②装置Ⅸ的作用是. ③王水是浓盐酸和浓硝酸的混酸一定条件下混酸可生成ClNO和Cl2该反应的化学方程式为. ④写出验证ClNO与H2O完全反应后的溶液中存在Cl﹣和HNO2的实验步骤取少量反应后的溶液于试管中.限选试剂如下AgNO3溶液稀硝酸KMnO4溶液 ⑤工业制得的NOC1中常含有少量N2O4杂质为测定产品纯度进行如下实验称取1.6375g样品溶于适量的NaOH溶液中加入几滴K2CrO4溶液作指示剂用0.8000mol/L硝酸酸化的AgNO3溶液滴定若消耗AgNO3溶液的体积为25.00mL则NOC1Mr=65.5的质量分数为
2x+4=a0+a1x+a2x2+a3x3+a4x4则a0+a2+a42-a1+a32的值为
NA表示阿伏伽德罗常数下列说法正确的是
Thedrivershouldn'thaveescapedaftertheaccident.Nowhehasto. A.sleeplikealog B.facethemusic C.killthefattedcalf D.pullhisleg
知函数fx=|2x+4|+|2x-a|. 1当a=6时求fx≥12的解集 2已知a>-2gx=x2若对于都有fx≥gx成立求a的取值范围.
25℃时FeOH2和CuOH2的饱和溶液中金属阳离子的物质的量浓度的负对数[﹣lgcM2+]与溶液pH的变化关系如图所示已知该温度下Ksp[CuOH2]<Ksp[FeOH2].下列说法不正确的是
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已知a1a2a3∈{246}记Na1a2a3为a1a2a3中不同数字的个数如N222=1N242=2N246=3则所有的a1a2a3的排列所得的Na1a2a3平均值为
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It'swellestablishedthatpeoplewithloweconomicstatusarethehardesthitbythecurrentobesitypandemic肥胖症aswellasrelatedhealthproblemssuchasdiabetes.Poorhealthcarestressunhealthylifestylesandalotofcheapjunkfoodareallthoughttoplayarole.Butanewstudysuggeststhere'sasubconscious潜意识componenttoo.Whenresearchersmerelyledstudyvolunteerstoconsiderthemselveslow﹣classtheyweremorelikelytopreferchooseandeatlargeramountsoffoodaswellashigher﹣caloriefoods.ThefindingspublishedintheProceedingsoftheNationalAcademyofSciencesreflectwhat'sbeenseeninavarietyofanimals.Thustheauthorsassumethatthementalproblemmaybeanevolutionaryholdover遗贸物intendedtoimprovesurvivalbycompensatingforalackofsocialandmaterialresources.Moreimportantforhumansthefindingssuggestthatwemayno!beabletodealwithobesitybyjustimprovingaccesstohealthierfoodsandpromotingexercise.ForthestudypsychologyresearchersatNanyangTechnologicalUniversityinSingaporedraftednearly500healthyparticipantsfortwoexperiments.Inthefirsttheteamhad101participantscompleteataskinwhichtheywereshownaladderwithtenstepsandtoldtoselectwhichsteptheywereonrelativetoeitherawealthywell﹣educatedpowerfulpersonorapooruneducatedunimportantperson.Nexttheparticipantsgottopickfoodsfromanimaginedbuffet.Takingintoaccountthingslikeeachparticipant'snormaleatingpatternhungerandgendertheresearchersfoundthatthosewhorankedtheirsocialstatuslowerchosemorefoodandmorehigh﹣caloriefoodsthanthosethatrankedthemselvesashavingahighersocialstatus.Intheotherexperimentresearchersgave167participantsthesamesocioeconomicrankingtaskthenaskedthemtomatchhighcaloriefoodspizzahamburgersfriedchickenandlowcaloriesfoodsvegetablesandfruitswitheitherpleasantorunpleasantdescriptorssuchastastyornasty.Againthosewholandedlowerontheladderhadatendencytopreferthehigh﹣calorie'Thesefindingssuggestthatthethoughtoflowsocialstandingmaybecriticallylinkedtoobesityriskviaincreasedintakeofcalories'theauthorsconclude.Assuchthesubjectiveexperienceoflowsocialstandingmaybeanotherbarriertoimprovinghealth.62.Whatdoestheauthorwanttorevealinthefirstparagraph?A.Moreandmorepeopletendtosufferfromdiabetes.B.Unhealthylifestylescontributetoobesitypandemic.C.Subconsciousplaysapartincausingobesitypandemic.D.low﹣classpeoplearelesslikelytobeaffectedbydiabetes.63.Whatisthepossiblelinkbetweenlow﹣classpeopleandanimals?A.Consumptionoflargeramountsoffoodresultsfromdesireforsurvival.B.Low﹣classpeopleandanimalsareeasilyaffectedbymentaldisabilities.C.Creaturesconsuminghigher﹣caloriefoodsconsiderthemselveslow﹣class.D.humansandanimalshavebothconsumedmuchfoodduringevolution.64.Howcanhumansdealwithobesitycompletelyaccordingtothefindings?A.Bycarryingoutthetwoexperiments.B.Byadoptingcomprehensiveapproaches.C.Byaccessinglargeamountsofhealthyfoods.C.Bygettinginvolvedinlotsofphysicalexercise.65.Thepassagemainlyintendstoinformusthat.A.findingsremaintobeprovedB.obesitypandemicrepresentsrisksC.lowsocialstandingruinsdignityD.positivethoughtshelpstayinshape.
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