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根据如图中甲、乙两种固体物质的溶解度曲线回答问题. (1)P点的含义:在t℃时甲与乙的溶解度 ; (2)在温度不变的情况下,把乙的不饱和容液变为饱和溶液的方法是 ; (3)甲中含有少量...
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如图是某实验小组的同学绘制的两种固体物质的溶解度曲线图.请你根据图示回答问题1t1℃时a物质的溶解度
右图1是甲乙两种物质的溶解度曲线20℃时向两支试管中加入等质量的甲乙两种固体物质分别加入10g水使其
20℃时,甲溶液是饱和溶液
图1中b表示甲物质的溶解度曲线
据图1可知,某温度下甲、乙两物质的溶解度相等
如图2,保持20℃不变分别再加溶质,两溶液浓度均增大
右图是甲乙两种固体物质的溶解度曲线请回答1在______℃时甲乙两物质的溶解度相等2在40℃等质量的
根据右图中甲乙两种固体物质的溶解度曲线回答问题1P点的含义:在t℃时甲与乙的溶解度____2在温度不
根据图1和图2回答问题1在tl℃时等质量的甲乙两种固体物质在水中的溶解现象如图1所示要使剩余的甲固体
根据下图中Ⅰ和Ⅱ回答问题1在t1℃时等质量的甲乙两种固体物质在水中的溶解现象如图Ⅰ所示要使剩余的甲固
请根据如图中甲乙两种物质的溶解度曲线回答下列问题.1在℃时甲乙两种物质的溶解度相同.2t2℃时100
根据图1和图2回答问题图2中ab分别表示甲乙两种物质的溶解度曲线1在t1℃时等质量的甲乙两种固体物质
如图是某实验小组的同学绘制的两种固体物质的溶解度曲线图请你根据图示回答问题1t1℃时a物质的溶解度b
下图是某实验小组的同学绘制的两种固体物质的溶解度曲线图请你根据图示回答问题1t1℃时甲物质的溶解度_
右图是甲乙两种固体物质的溶解度曲线请回答1在______℃时甲乙两物质的溶解度相等2在40℃等质量的
下图是甲乙两种固体物质的溶解度曲线回答下列问题130℃时甲物质的溶解度是________g2当温度为
右图是甲乙两种固体物质的溶解度曲线回答下列问题130℃时甲物质的溶解度是g2当温度为℃时甲乙两种物
如图所示为甲乙两种固体的溶解度曲线下列说法错误的是
40℃时,甲的溶解度大于乙的溶解度
20℃时,甲、乙两种物质的溶解度相等
甲、乙两种物质的溶解度都随温度的升高而增大
20℃时,把30g甲物质加入100g水中,充分溶解后所得溶液为饱和溶液
甲乙两种固体物质的溶解度曲线如图所示请回答问题1t1℃时甲乙两种物质的溶解度大小关系为甲______
如图是甲乙两种固体物质的溶解度曲线根据图回答问题1t1℃时甲乙两种物质的溶解度甲乙填>=或<.2若想
根据甲乙两种固体物质的溶解度曲线图回答下列问题120℃时甲物质溶解度选填大于等于或小于乙物质溶解度2
20℃时将等质量的甲乙两种固体物质分别加入到盛有100g水的烧杯中充分搅拌后现象如图1加热到50℃时
请根据如图中甲乙两种物质的溶解度曲线回答下列问题.1在_________℃时甲乙两种物质的溶解度相同
如图是甲乙两种固体物质的溶解度曲线根据图回答问题1t1℃时甲乙两种物质的溶解度甲乙填>=或<.2若想
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已知F1F2分别是双曲线﹣=1a>0b>0的左右焦点若双曲线的右支上存在一点P使得•=0O为坐标原点且|PF1|≥|PF2|则双曲线的离心率的取值范围是.
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武汉某科技公司为提高市场销售业绩现对某产品在部分营销网点进行试点促销活动.现有两种活动方案在每个试点网点仅采用一种活动方案经统计2018年1月至6月期间每件产品的生产成本为10元方案1中每件产品的促销运作成本为5元方案2中每件产品的促销运作成本为2元其月利润的变化情况如图①折线图所示. 1请根据图①从两种活动方案中为该公司选择一种较为有利的活动方案不必说明理由 2为制定本年度该产品的销售价格现统计了8组售价xi单位元/件和相应销量y单位件i=12…8并制作散点图如图②观察散点图可知可用线性回归模型拟合y与x的关系试求y关于x的回归方程系数精确到整数 参考公式及数据=40=660xiyi=206630x=12968 3公司策划部选=﹣1200lnx+5000和═﹣x3+1200两个模型对销量与售价的关系行拟合现得到以下统计值如表格所示 相关指数R2=1﹣. i试比较R12R22的大小给出结果即可并由此判断哪个模型的拟合效果更好 ii根据1中所选的方案和i中所选的回归模型求该产品的售价x定为多少时总利润x可以达到最大
Inthepastfewyearswe'veseenworksbyChinesesci﹣fiwriterswinninginternational. A.conclusion B.standard C.potential D.recognition
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在平面直角坐标系xOy中曲线C的参数方程为α为参数在以原点为极点x轴正半轴为轴的坐标系中直线l的极坐标方程为ρsin=. 1求曲线C的普通方程和直线l的直角坐标方程 2设点P﹣10直线l和曲线C交于AB两点求|PA|+|PB|的值.
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HistoryFairCompetition Understandinghistoryisvitaltounderstandingourselvesasapeopleandasanation.Historyismuchmorethanthestudyofdustyoldobjectsandeventslongpast.Itisanessentialpartofwhowearetodayandwhowewillbecome.ThorntonMiddleSchoolHistoryFairCompetitionmakesunderstandinghistoryexcitingengagingandfun! ThisYear'sTheme AllparticipantsmustaddresshowcommunicationortransportationtechnologyhaspromotedthequalityoflifeforAmericansthroughouthistory.Tomanypeopletechnologymeanscomputershand﹣helddevicesorvehiclesthattraveltodistantplanets.Howevertechnologyisalsotheapplicationofscientificknowledgetosolveaproblemtouchinglivesincountlessways. Individualsorgroupsmayenteroneofthefollowingcategories •Performance •Documentary纪实作品 •EssayWriting CategoryRequirements PerformanceAdramaticpresentationofthetopicnomorethan10minuteslong.Ifspecialclothesareusedtheyshouldtrulyrepresentagivenperiod. DocumentaryAvisualpresentationsuchasavideoslideshoworcomputerprojectnomorethan10minuteslong.Adesktopcomputerscreenprojectorandloudspeakerswillbeavailable.StudentsmustprovidetheirpresentationsonCDsbeforeFridayMarch23. EssayWritingAnacademicpaperof2000to2500words.Noillustrations图解areallowed.Pleasedonotincludecovers.Alistofreferencesmustbeincluded. ImportantDates January5Submitatopicproposaltoyourhistoryteacher.Theteachermayrequireasecondproposalifthefirstisoff﹣topicorunclear. February5Submitafirstdraftofyouressayperformancescript剧本ordocumentaryhighlights. February19Acommitteeofteacherswillevaluatematerialsandgiveopinions.Studentsthenhaveanopportunitytoimprovetheirproducts. March9Submitafinaldraftofyouressay. March15Performanceanddocumentarycommitteepreview March24ThorntonMiddleSchoolHistoryFairCompetition 700A.M.﹣900A.M.Participantssigninginatthegym 1000A.M.﹣600P.M.Competitionandjudges'review 700P.M.Awardsceremonyandpicnic 1AccordingtoParagraph1whatisthemajorgoalofunderstandinghistory? A.Topreservenationaltraditions. B.Toprepareforahistorycompetition. C.Tobetterknowthepresentandfuture. D.Tofurtherexplorehistoricalmysteries. 2Whatisthethemeofthisyear'scompetition? A.Technologyadvancesscience. B.Scienceinteractswithtechnology. C.Sciencehasmadethestudyofhistoryeasy. D.TechnologyhasimprovedthelifeofAmericans. 3Amongtheitemsprovidedbytheschoolforavisualpresentationare. A.specialclothesandascreen B.adesktopcomputerandaCD C.aprojectorandspecialclothes D.adesktopcomputerandloudspeakers 4Whatwouldaparticipanthavetodowithanessayof1500wordstomeetthecategoryrequirement? A.Includemoreinformationintheessay. B.Removethereferences. C.Provideacoverfortheessay. D.Explainthedetailswithillustrations. 5WhatwillthecommitteeofteachersdoonFebruary19? A.Previewperformancesanddocumentaries. B.Makecommentsonthematerials. C.Improvetheparticipant'sfirstdraft. D.Collectasecondproposalfromtheparticipant.
I'msorryyou'vebeenwaitingsolongbutit'llbesometimeBriangetsback. A.where B.since C.till D.before
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