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如图所示,质量均为m的斜面体A、B叠放在水平地面上,A、B间接触面光滑,用一与斜面平行的推力F作用在B上,B沿斜面匀速上升,A始终静止.若A的斜面倾角为θ,下列说法正确的是( )
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高三下学期物理《》真题及答案
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如图所示质量分别为mAmB的两物块
B.,叠放在一起,共同沿倾角为α的斜面匀速下滑,斜面体放在水平地面上,且处于静止状态。则( ) A.A.
间无摩擦力 B.B.所受滑动摩擦力大小为m
B.
gsinα
B.与斜面间动摩擦因数μ=tanα
斜面体有向右的运动趋势。
如图所示放在水平地面上的斜面体
质量为M.,一质量为m的物块
恰能沿斜面匀速下滑。若对物块施以水平向右的拉力F.,物块B.仍能沿斜面运动。则以下判断正确的是( )
A.物块B.仍将沿斜面匀速下滑 B.物块B.将沿斜面加速下滑
地面对斜面体A.有向左的摩擦力
地面对斜面A.的支持力小于(M+m)g
如图所示质量为M.倾角为θ的斜面体置于光滑的水平地面上要使原来与斜面接触的质量为m的小球作自由落体运
Mgcotθ
Mgtanθ
Mgcosθ
Mgsinθ
如图所示质量为m的物体在沿斜面向上的拉力F.作用下沿放在水平地面上的质量为M.的粗糙斜面匀速下滑此过
无摩擦力
有水平向左的摩擦力
支持力为(M.+m)g
支持力小于(M.+m)g
如图所示斜面体质量为M.倾角为θ置于水平地面上当质量为m的小木块沿斜面体的斜面匀速下滑时斜面体仍静止
斜面体受地面的支持力为Mg
斜面体受地面的摩擦力为mgcosθ
斜面体受地面的支持力为(m+M)g
斜面体受地面的摩擦力为mgsin2θ/2
如图所示斜面体M.放在水平地面上.现将物块m放在斜面上物块恰能沿斜面匀速下滑而斜面体静止不动.若用平
对地面的压力不变
对地面的压力增大
可能沿水平面向右运动
受到地面的摩擦力方向水平向左
如图所示放在水平地面上的斜面体质量
为M.,一质量为m的物块
恰能沿斜面匀速下滑,若对物块施以水平向右的拉力F.,物块B.仍能沿斜面运动。则以下判断不正确的是 ( ) A.物块B.仍将沿斜面匀速下滑B.物块B.将沿斜面加速下滑
地面对斜面A.有向左的摩擦力
地面对斜面A.的支持力等于(M+m)g
如图所示光滑的斜面体质量为M.倾角为长为质量为m小物块从斜面体顶端由静止开始下滑斜面位于光滑的水平地
如图所示质量为M.的直角三棱柱A.放在水平地面上三棱柱的斜面是光滑的且斜面倾角为θ.质量为m的光滑球
如图所示质量为m的物体在沿斜面向上的拉力F.作用下沿放在水平地面上的质量为M.倾角为的粗糙斜面匀速下
无摩擦力
有水平向左的摩擦力
支持力为(M. + m)g
支持力小于(M.+ m)g
如图所示倾角α的斜面体质量为M.静止放在粗糙的水平地面上质量为m的木块沿斜面由静止开始加速滑下已知斜
木块对斜面的压力为mgsinα
木块沿斜面下滑的加速度为gcosα
斜面体对地面的压力大于(m+M)g
斜面体对地面的静摩擦力方向水平向右
如图所示一质量为m的物体在沿斜面向上的外力作用下静止在质量为M.的斜面体上斜面体静止在水平地面上则
水平地面对斜面体的摩擦力水平向右
水平地面对斜面体无摩擦力
水平地面对斜面体的支持力小于(M+m)g
水平地面对斜面体的作用力方向竖直向上
如图3所示倾角为θ的光滑斜面固定在水平地面上质量为m的物块A叠放在物体B上物体B的上表面水平.当A随
如图所示斜面体质量为M.倾角为θ置于水平地面上当质量为m的小木块沿斜面匀速下滑时斜面体仍静止不动则
斜面体受地面的支持力为Mg
斜面体受地面的支持力为(m+M)g
斜面体受地面的摩擦力为mgcosθsinθ
斜面体受地面的摩擦力为0
2011天水模拟.如图所示倾角为θ的斜面体放在水平地面上质量为m的光滑小球放在墙与斜面体之间处于平衡
如图所示将粗糙的斜面体M.放在粗糙水平地面上物块m放在斜面上恰能沿斜面匀速下滑斜面体静止不动若用平行
受地面的摩擦力大小为零
受地面的摩擦力方向水平向右
对地面的压力不变
可能沿水平面向右运动
如图所示表面粗糙的斜面体M.放在水平地面上物块m恰好能在斜面体上沿斜面匀速下滑斜面体静止不动若对物块
物块m将静止在斜面体上
物块m仍沿斜面匀速下滑
斜面体M.受地面的摩擦力方向水平向左
斜面体M.受地面的摩擦力方向水平向右
如图所示放在水平地面上的斜面体
质量为M.,一质量为m的物块
恰能沿斜面匀速下滑。若对物块施以水平向右的拉力F.,物块B.仍能沿斜面运动。则以下判断正确的是 A.物块B.仍将沿斜面匀速下滑 B.物块B.将沿斜面加速下滑
地面对斜面体A.有向左的摩擦力
地面对斜面A.的支持力小于(M+m)g
如图所示质量为m的物体放在质量为M.倾角为θ的斜面体上斜面体置于粗糙的水平地面上用平行于斜面的力F.
M.相对地面有向右运动的趋势
地面对M.的支持力为(M+m)g
地面对M.的摩擦力大小为Fcosθ
物体m 对M.的作用力的大小为mg
如图4所示质量为M倾角为α的楔形物A放在水平地面上.质量为m的B物体从楔形物的光滑斜面上由静止释放在
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IworkinamarketinLondonjustattheweekends﹣﹣﹣I'vegotasecond﹣handbookstoreandonedayI1getmystorereadywhenanoldladycameupandstartedlookingatthebooks.ShestartedchattingandtellingmehowsheusedtoliveinthatpartofLondonand2muchithadchangedsinceshe'dlastbeeninthearea.WhileweweretalkingIputoutabook3coverwasalittleoldandshepickeditup.OhGrimm'sFairyTalesshesaidIhadacopyofthis4Iwasachild. Shebeganflickingthrough翻阅itandIcarriedonlayingoutthebooksandwhenIlookedupshewasjuststandingthere5shakeandshe'dgone6completewhite.But…but…thisismyactualbookshesaid.Lookit'sgotmynameJoaninit.Thenshetoldmehowthere'dbeenaterriblefirewhileherfamilywereaway7holidayandthehousehadbeenburnttotheground.Shethoughtallherbelongings8destroy.Shepulledoutherpurse9buythebookfrommebutIstoppedher.Nono…pleaseacceptit10agift﹣it'ssuchawonderfulstory.
已知i是虚数单位则2﹣3i2+3i+5i=
某老小区建成时间较早没有集中供暖随着人们生活水平的日益提高热力公司决定在此小区加装暖气该小区的物业公司统计了近五年截止2018年年底小区居民有意向加装暖气的户数得到如下数据 Ⅰ若有意向加装暖气的户数y与年份编号x满足线性相关关系求y与x的线性回归方程并预测截至2019年年底该小区有多少户居民有意向加装暖气 Ⅱ2018年年底郑州市民生工程决定对老旧小区加装暖气进行补贴该小区分到120个名额物业公司决定在2019年度采用网络竞拍的方式分配名额竞拍方案如下①截至2018年年底已登记在册的居民拥有竞拍资格②每户至多申请一个名额由户主在竞拍网站上提出申请并给出每平方米的心理期望报价③根据物价部门的规定每平方米的初装价格不得超过300元④申请阶段截止后将所有申请居民的报价自高到低排列排在前120位的业主以其报价成交⑤若最后出现并列的报价则认为申请时问在前的居民得到名额为预测本次竞拍的成交最低价物业公司随机抽取了有竞拍资格的50位居民进行调查统计了他们的拟报竞价得到如图所示的频率分布直方图 1求所抽取的居民中拟报竞价不低于成本价180元的人数 2如果所有符合条件的居民均参与竞拍请你利用样本估计总体的思想预测至少需要报价多少元才能获得名额结果取整数 参考公式对于一组数据x1y1x2y2x3y3…xnyn其回归直线=x+的斜率和截距的最小二乘估计分别为==﹣
BecautiousofFridaythe13th!Manypeoplethinkthedayisunlucky.1fortunethere'sonlyoneFridaythe13ththisyear.Asthelegendgoesyoushouldtrynot2breakanymirrorswalkunderaladderorevenspillanysalt.Why?Researcherssay3istoughtofindouthowthetraditioncameintobeing.Manybelieveithas4religionorigins.IntheChristianfaiththerewereguestsattablefortheLastSupperwhichwasheldthedaybeforetheFriday5Jesusdied.NowFridaythe13thhasbecomeaculturalwonder.ManyAmericansavoidthenumber13alltogether6includehotelroomsandairplaneseatassignments.Itevencostscoupleslesstogetmarriedontheday.Therearemanyother7explainbehindthelucklessday.SimonBronneraprofessorofAmericanstudiesatPennsylvaniaStateUniversity8believeFridaythe13thisawayforpeopletopintheirbadlucktoacertaincause.Thefactshouldbe9there'snothingspecialaboutthenumberitself.Afterallthenumber1310considertobeluckyinsomecountrieslikeItaly.
假设你是红星中学高三学生李华你写信建议你的美国朋友George参加中国日报ChinaDaily专门为外国人举办的2018最美中国AmazingChina手机摄影大赛. 信的内容包括1.作品内容要求 2.提交时间和方式 3.表示愿意提供帮助. 注意1.词数不少于100 2.开头和结尾已给出不计入总词数. DearGeorge I'mlookingforwardtoyourreply.﹣﹣﹣﹣ Yours LiHua
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设函数fx=|x+3|+|2x﹣a|﹣1a∈R. Ⅰ若不等式fx+|x+3|≥3对任意的x∈R成立求实数a的取值范围 Ⅱ当a>﹣6时函数φx=2|x+3|﹣x﹣fx有三个不同的零点求a的取值范围.
函数y=4+3的最大值为
已知函数fx=如果对任意t∈Rf3t2+2t+fk2﹣2t2<0恒成立则满足条件的k的取值范围是.
已知b<<a<1则下列不等式中一定成立的是
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. Goodafternoonboysandgirls!Welcometotheschoolhall.Arobotcompetitionorganizingbyourschoolisabouttobeginwith.Tenparticipantswouldtakepartonbehalfofyourclass.Thecompetitionincludestwoparts.Inthefirstpartparticipantsareexpectedtoansweracertainnumberofquestionaboutrobots.Inthesecondparttheyaresupposedtofinishsomeoperationsfollowingthatwerequest.Nowthejudgesarearrivingbutalloftheparticipantsareinposition.Ithasbeenalongtimewhenweheldsuchanactivitylasttime.Let'swaitpatientfortheirwonderfulperformances.Ibelievewe'llsurelyhaveunforgettableafternoonhere.
若关于x的不等式|ax﹣3|<7的解集为{x|﹣5<x<2}则a的值为
设复数z=a+bii为虚数单位ab∈R且=b+i则复数z的模等于
Leadersshapehistoryandhereisaselectionofthemostremarkableviewsintothesepublicfiguresplusfirst﹣handaccountsbythosewithaccesstothem. MargaretThatcherbyCharlesMoore2013 BeforeMoorepublishedthefirstvolumeofhisbiographytherehadalreadybeenamountainofbooksonThatcher.Moore'saccountisdifferent.Heshowsthatfarfrombeingfearlessshecouldoftenbefearfulwithoutcause.Thefinalvolumewillincludeherfallfrompower. HaroldWilsonbyBenPimlott1992 HaroldWilsonhadbecomeaghostlyfigurewhenthisbookwaspublishedin1992.Theabsenceheightenedasenseofmystery.Whowashe?Howtoexplainhisseeminglycontradictorycharacteristics?PimlottsolvessomeofthemysteriesthebookisdetaileduntilWilson'sfinalphaseasprimeministerin1974. ChurchillbyRoyJenkins2001 JenkinswritesapoliticianaswellasahistoriananalyzingChurchill'shistoricmovesfromtheopinionsofonewhohadalsospokenintheCommons.JenkinshadresignedfromhighpositionsinbattlesoverpolicyandasonethatchangedpartiesthoughnotasfrequentlyasChurchilldid. RoyJenkinsbyJohnCampbell2014 CampbellcalmlynarratesthemanypoliticalandpersonaldramasincludingJenkins'intenserelationshipwithAnthonyCroslandwhentheywerebothstudentsatOxford.CampbellalsoaddressesJenkinsvariousaffairswithwomen.LikeJenkins'spoliticalheroesheledmanylives.Campbellissharpindescribingeachofthem. DiariesVolumesOnetoSixbyAlastairCampbell2017 LoveorhatehimCampbellremainsthemasteroftheinsidestoryandnotjustbecauseofhisunusualideasontherelationshipbetweenTonyBlairandGordonBrown.Thisisanincrediblydetailedbookonwhatit'sliketoliveinsideNo.10thecruelspaceofeventsandtheconstantconflictwiththemedia. 1Whichofthefollowingleadershasthelargestnumberofbookswrittenaboutthem? A.HaroldWilson. B.Churchill C.MargaretThatcher. D.TonyBlair. 2Whichwriterwasonceapolitician? A.BenPimlott. B.CharlesMoore. C.JohnCampbell. D.RoyJenkins. 3What'spurposeoftheauthor'swritingthepassage? A.Tointroducesomehistoriesonselections. B.Torecommendsomebooksonleaders. C.Totellsomemysteriesabouthistorians. D.Tothinkhighlyofsomefamousleaders.
函数fx的图象如图所示f'x是fx的导函数下列数值排序正确的是
OnNov24nearYellowstone'snortheastentranceSpitfireafemalegreywolfwasshotandkilledbyahunterassheapproachedagroupofcottages. ItwasalegalharvestAbbyNelsonawolfmanagementspecialistsaid.Thecircumstancesareobviouslyalittlebitharderforpeopletostomachbutthatpackhasshowedsignsofhabituation习惯.Theyjuststandthereandhavenofear.Wolfhunterscaneasilypicktheonetheywant. ThecarefreerelationthatsomeYellowstonewolveshavebuiltwithhumansisreportedlyattractiveforhunterswholookforaneasykill. InthewakeofyetanotherfamousYellowstonewolfmeetingaviolentendoutsidetheparkofficialsareactivelyrethinkinghowtomanagewildlifehabituation. SmithawolfbiologistforYellowstonesaysNowwe'rethinkingofpoundingthem.Parkofficialsmightusefireworksandpaintballorbeanbaggunswhentheyapproachhumansinthepark.Ifyougetclosetopeopleyou'regoingtogetattacked. Ifyouthinkthissoundscruelyou'renotalone.Seeingthesecreaturesfromtheroadsthatwindthroughtheparknotonlyallowstouriststowitnesssomethingamazingbutalsotoreconnectwithnatureinawaythatisbetterthananyconservationcampaign.Butthere'salsoagrowingsensethatthepresentpolicyofdoingnothingisn'tworkingmorewolveswillneedlesslydieandthebrokenrecordofhuntersscoringeasykillswillgoon. AsSmithaddsurgingpeopletokeepwolveswildwhenmeetingthemhalfwayisabigask.Stillhe'shopefultopreservetheworld'sbestplacetoobservefree﹣rangingwolvesit'sapolicychangethattouristscanbeinvolvedin..perhapsSpitfire'sdeathwillaccomplishsomegoodandwe'llallcometogethertodoabetterjobonmanagingcrowdsandroadsandwolvesinYellowstoneSmithsaid. 1WhatwasthemainreasonforthedeathofSpitfire? A.Wildlifehabituation B.Parkofficialscarelessness. C.Thenatureofgreywolves. D.Thecrueltyofthehunter 2Whatdoestheunderlinedwordpoundinginparagraph5probablymean? A.Greeting B.Protecting. C.Challenging D.Hitting. 3WhatdoesSmithexpectvisitorstodoinYellowstone? A.Bemorefriendlytowolves B.Avoidmeetinggreywolves. C.Keepawayfromwolves. D.Forcewolvesawayfromthem 4Whatisthemainideaofthetext? A.ThewolvesinYellowstoneareoutofcontrol B.Illegalwolf﹣huntinginYellowstoneisgoingon C.Yellowstoneconsidersattackingwolvestoprotectthem D.ThewolvesinYellowstonearelivinginharmonywithhumans.
己知偶函数y=fx在﹣∞0上单调递增若a=fb=f2﹣1.2c=f则
阅读下面短文根据所给情节进行续写使之构成一个完整的故事. WhenRyanfirstturnedupforMs.Rose'sclasshewaskindofnervousbecausehe'dheardMs.Rosecouldbearealmonstersometimes.ButasMs.Rosestartedwithanoverviewofwhatthey'dbedoingduringtheyearinapleasantvoiceshelookedniceenough.Thenwithamoreseriousoneshewarnedthestudentsthatshe'dbegivingthemhomeworkassignmentswhichwerenottobehandedinlateandtheyweretobecompletedfully.Noexcuse!Noextensions! Thatdaysheassignedtheclassitsfirsthomework.Theyhadtodoasheetofmathproblemsandreadashortstory.Itwasn'tdueuntilThursdaybutshesuggestedtheydoitimmediatelythatnight.Homeworkhasawayofpilingup.shesaidhereyesnarrowingslightly.ButtodaywasonlyMonday!TherewasplentyoftimeRyanthought. SowhenschoolwasoverRyanandhisfriendsranofftoplaybaseball.ExhaustedafterthegameheentertainedhimselfwithhisfavoriteTVshowleavinghishomeworkasideonhisdesk.DayspassedquicklyRyanwasfreeofworriesmostofthetimewhileMs.Rosejustoccasionallyremindedthemofthedeadlineandthatshewouldn'ttolerateanyonenothavingdoneit. Wednesdayafterdinnerhesuddenlyrealizedthathishomeworkwasduenextday.Heracedtohisdeskandwasgreetedwiththemostcuriousthing.Thepileofhomeworkreallyhadgrowntaller.Ohno!Whatwashegoingtodo?Itlookedasifthepapershadtoweredoverhimalmostsoaringuptotheceiling. Hereallyneededtogetstarted.Hedidalittlebithereandtherebuthekeptdistractedbyotherworkwaitingforhim.Finallyhecouldn'tevenlocatethehomeworkhe'dstartedwith.Frustratedhegaveupandwenttobed.Ryantossedandturnedallnightandhaddreamsofpapermountainsburyinghimalive. ThenextmorningwhenRyanenteredtheclassroomhefoundMs.Rosewaitingherfaceddarkwithrage.ObviouslyRyanwasn'ttheonlyonewhosufferedfromthemysteriouslygrowingassignments. 注意 1.所续写短文的词数应为150左右 2.至少使用5个短文中标有下划线的关键词语 3.续写部分分为两段每段的开头语已为你写好 4.续写完成后请用下划线标出你说使用的关键词语. Paragraph1 FailingtomeetthedeadlinethestudentshadtowatchasMs.Rosetransformedintotherealmonster. Paragraph2 WithasatisfiedsmileMs.Rosefinallyreleasedeveryonebutassignedtheclasssomeextrahomework.
已知函数且fm=﹣2则fm﹣6=
在直角坐标系xOy中直线C1x=﹣3圆C2x﹣22+y﹣12=1以坐标原点为极点x轴正半轴为极轴建立极坐标系 Ⅰ求C1C2的极坐标方程 Ⅱ若直线C3的极坐标方程为θ=ρ∈R设C2C3的交点为AB求△C2AB的面积.
Residents居民inthepoorestareasintheU.S.facealifeexpectancy平均寿命uptodecadeshorterthanthoseinthewealthiestareasaccordingtoastudypublishedintheAmericanJournalofPublicHealth. ResearchersfromEastTennesseeStateUniversitywantedtobetterunderstandhowsocioeconomicstatuswasassociatedwithhealthoutcomes.Tofindouttheydividedthecountry's3141areasinto50newstateswith2percentoftheareasineachbasedonhouseholdincomeratherthanongeography. Theresearchersbrokedownthedatabycounty郡县sincetheyfoundstate﹣leveldatamayhidesomeeffectofsocioeconomicdifferencesonboththebest﹣offandworst﹣offcounties.Theythenexaminedhealthdatafromthewealthiestandpooreststatestopandbottom2percenttoseehowresidentsdifferedonfactorslikesmokingclinicalcareandexcessive过多的drinking.Researchersfoundthattherewasnearlya10﹣yeargapinthelifeexpectancyofmenwithanaverageof79.3yearsinthewealthycountiescomparedto69.8yearsinthepoorest.Forwomenthedifferencewasslightlyless83yearsinthewealthiestcountiesand76yearsinthepoorest. Thestudyauthorswerecautiousthatwhiletheyfoundaconnectionbetweensocioeconomicstatusandhealthoutcomestheydidnotanalyzecauseandeffect.Buttheysuggestthatthedatashowshowpolicymakersshouldnotjustfocusonstate﹣wideinitiatives主动性butmoretargetedeffortstohelpthosemostatrisk.Withlimitedresourcesmethodsofknowingthepoorestareasexactlycanbequitesignificantintheequaldistribution分配ofresourcesandprogramstothosecommunitiesthatareinthegreatestneed''thestudyauthorswrote. 1HowdidResearchersdividetheareas? A.Bysocialstatus B.Byincome C.Byhealth D.Bylivingplaces 2WhichofthefollowingisTRUEaccordingtoParagraph3? A.Thewomendifferenceislessthanthemaninlifeexpectancy. B.Thewealthieststatelikehidingtheirwealth. C.Mosthealthdataisunbelievable. D.Mostpooreststatesmokeanddrinkalot. 3Whatcanweinferfromthelastparagraph? A.Theresearchersthinktheirstudyisperfect. B.Peoplestilldon'tknowthecauseoflifeexpectancy. C.Thegovernmentshouldlearnsomethingfromthestudy. D.TheAmericanresourcesdistributionisnotfairatall. 4Whatwouldbethebesttitleforthepassage? A.Waystohavealonglifeexpectancy B.GreatincomedifferencesintheUSA C.ThehealthproblemintheUSA D.Meninrichest10yearslongerinpoorest
Atfirstglancethebusinessworldisnoplaceforyoungwomenasmyco﹣foundersandIhavebeentoldonmanyoccasions.Inspiteofthispessimisticviewofwomen'sopportunityinbusinesswethreecollege﹣agegirlwithzeroexperienceinbusinessstartedoffwithahighlyambitiousgoaltostartaseaweedfarminNorthCaliforniaandgrowasmuchseaweedaspossibletohelpreducecarbonemission排放andnutrientpollutionfromagriculturalsources. Inthebeginningourideaswereeitherignoredorscoffedbytheresearchersfromwhomwesoughthelpandadvice.Butwecarriedonwithourresearch﹣ifotherswouldn'tprovideusanswersweweren'tafraidtoworkthemoutourselves.Wediscoveredwhichspeciescouldgrowinwarmerwatersandwe'didentifiedpotentialmarketsintowhichweplannedtoselltheproducts.We'vespentthelasttwoyearssettingupthefirstseaweedfarminNCapplyingforapatent专利andcompetingwithfivefinalteamsinfrontoftheUnitedNationsfor﹩1million. Despitealloureffortsmanyindustryexpertsremainedunwillingtotakeusseriously.Butasoftenhappensinbusinessthesamecharacteristicswewereignoredforwereinrealityourbiggestcompetitiveadvantages.Ouragegaveusthestrengthtobouncebackfromfailureandourbackgroundasenvironmentalscientistsratherthanbusinesswomenhelpedusfindnewmarketingopportunities.Forevery10farmerswhoclaimednobodywouldeverwanttofeedtheircowsseaweedwefoundonewhowasinterested.Forevery15cosmeticsproducerswhorefusedtoanswerourcoldcallswestucktotheonewithaninterestingideaforseaweedlotion. Overthecourseofourearlybusinessdevelopmenteffortswehavehadaccesstoawealthofresourcesprogramsandindividualswhoworkconstantlytohelpussucceed.Bystayingfocusedonbringingourideastolightourteamhasdemonstratedthatentrepreneurship创业isexactlytherightplaceforthehopeful. 1Whatwasthemajorcausefortheirdifficultyinstartingbusiness? A.Theyarewomen. B.Theywereyoung. C.Theylackedexperience. D.Theysufferedprejudice. 2Whatdidtheydotomaketheirbusinesssuccessfulaccordingtothepassage? A.Theyexpandedtheirseaweedfarms. B.Theyexperimentedonseaweedspecies. C.Theygottheirproductofficiallyrecognized. D.TheyconsultedtheUnitedNations. 3Whatisthethirdparagraphmainlyabout? A.Howtheybenefitedfromtheirweaknesses. B.Howtheygotothersinterestedinseaweed. C.Howtheymadethemselvesmorecompetitive. D.Howtheyapproachedpotentialcustomers. 4Whatisthefollowingcanbebestdescribethethreewomen? A.Naiveandsimple﹣minded. B.Ambitiousandself﹣centered. C.Adventurousandpersistent. D.Stubbornandcourageous.
某同学根据一组xy的样本数据求出线性回归方程=x+和相关系数r下列说法正确的是
在矩形ABCD中对角线AC分别与ABAD所成的角为αβ则sin2α+sin2β=1在长方体ABCD﹣A1B1C1D1中对角线AC1与棱ABADAA1所成的角分别为α1α2α3与平面AC平面AB1平面AD1所成的角分别为β1β2β3则下列说法正确的是 ①sin2α1+sin2α2+sin2α3=1 ②sin2α1+sin2α2+sin2α3=2 ③cos2α1+cos2α2+cos2α3=1 ④sin2β1+sin2β2+sin2β3=1
Whatmakesagoodapology?Whatistherightwaytosaywe'resorrythatdoesn'tmerelyrelieveourguiltorgetusoutofhotwaterbutbestservesthepersonwehurt?Thereismoretosayingsorrythanjustsayingsorry.1Theyincludeexpressingregretexplainingwhatwentwrongacknowledgingresponsibilityofferingtorepairthesituationandrequestingforgiveness. Thatmayseemlikealottorememberbutacknowledgementofresponsibilityturnedouttobethemostimportantpiece.Ofcoursenotalltheruinedsituationsarecreatedequal.2Hereareafewkeytips. Haveperfecttiming.Didyoutotallyruinthesituation?Alittlecool﹣offtimecouldhelp.3.Butiftheotherpartyisangryatyourwrongdoingitmaybemoreeffectivetowaitbecausetheirangermaypreventthemfrombeingreceptivetoanapology.Waitingcanhelpyoutoo.Thebesttimetoapologizeiswhenonefeelsreadytosincerelyapologize. 4Expertsagreethatface﹣to﹣faceapologiesbeatphoned﹣ine﹣mailedorhandwrittenones.Facialexpressionsgesturesandthetoneofvoicehaveallbeenshowntobeimportantchannelsthatconveysincerity.AnyonecantypeIfeelreallyashamedbutifyousayitliveit'sobviouswhetherornotyoumeanit. Explaindon'texcuse.Becauseadmittingtobeingwrongispainfulandcanmakepeopleworriedthatthey'reabadpersontheyoftenwaterdowntheirapologywithexcuses.ExamplesincludeIcertainlyapologizeifIoffendedanyoneandI'msorrybutyoustartedit.Thatsortofapologyhasanameanon﹣apology.Itusestheformofanapologybutfollowsitupbyshifting﹣responsibilitytotheoffendedpersonImplyingheorsheistoosensitive.5Evenifyoudidsomethingcomparablylessimportantlikebeinglateallthetimeit'salwayskeytorememberthatwhileyou'retheoneapologizingit'snotaboutyouit'saboutthepersonyouhurtandwhattheyneednow. A.Letyourbodydothetalking. B.Thereareseveraltypesofapologies. C.Getreadytochangeyourfacialexpressions. D.SometimesanImmediateapologyiscalledfor. E.Don'timplythattheotherpersoniswrongtofeelupsetorangry. F.Infactastudyfoundthateffectiveapologieshavefivecomponents. G.Soyoumightneedtofine﹣tuneyourapologydependingonthecircumstances.
恩格尔系数Engel'sCoefficient是食品支出总额占个人消费支出总额的比重恩格尔系数越小消费结构越完整生活水平越高某学校社会调查小组得到如下数据 若y与x之间有线性相关关系某人年个人消费支出总额为2.6万元据此估计其恩格尔系数为. 参考数据=4=22.5 参考公式对于一组数据x1y1x2y2x3y3…xnyn其回归直线=x+的斜率和截距的最小二乘估计分别为==﹣
某校有ABCD四个社团其中学生甲乙丙丁四人在不同的四个社团中在被问及在哪个社团时甲说“我没有参加A和B社团”.乙说“我没有参加A和D社团”.丙说“我也没有参加A和D社团”.丁说“如果乙不参加B社团我就不参加A社团”.则参加B社团的人是
ManychildrendreamofbecomingmanagerswhentheygrowupbutveryfewstartasearlyasJoseAdolfoQuisocalaCondoriaPeruvian秘鲁boywhostartedachildren'ssavingsbankwhenhewasonly7yearsold.Todayhisbankhasbeen1toserveover2000clients客户. Sixyearsagohe2thatmanyofhisfriendswerespendingtheirmoneyonsweetsandtoys3savingitformoremeaningfulpurchases.Despitehisyoungagehe4thatsavingmoneyandaccessingthe5systemweretwowaysthatadultssolvedmanyoftheirmoneyproblemssohedecidedtomakethem6tokidsaswell.Hethenstarted7waysthatchildrencouldmakemoneywithoutthehelpoftheirparentsandrecyclingseemedlikethe8answer.Butwhenhecameupwithhisideaforachildren'sbanktohisteachershewastoldthata7﹣year﹣oldcouldn'tdealwithsuchan9.Butfinallyhe10themallwrong. AtthebeginningmyteachersthoughtIwascrazyJoserecalls.LuckilyIhadthe11oftheschoolheadmasterwithwhosehelphe12abankwherechildrencouldbecomeclientsbyturninginatleast5kilogramsof13wasteandwererequiredtosaveatleastoneotherkilogramofwasteeverymonth.Theywouldthensetasavings14andcouldonlygetmoneyfromtheir15whentheyreachedit. Between2012and2013hisbank16onetonofwasteandserved200childrenattheschool.Itwasareal17drawingalotofattentionandhe18co﹣workedwithalargebanktomakethiskindof19accessibletomorechildren. Forhisachievementshehasreceivedseveralhonoraryawardsforhelpingkidswiththeir20ofmoney. 1A.expanded B.founded C.predicted D.recommended 2A.admitted B.noticed C.doubted D.supposed 3A.asfor B.dueto C.insteadof D.incaseof 4A.suspected B.insisted C.decided D.understood 5A.social B.educational C.emotional D.financial 6A.available B.attractive C.amazing D.important 7A.puttingup B.thinkingof C.turningdown D.callingfor 8A.practical B.merciful C.fluent D.curious 9A.attitude B.honor C.story D.project 10A.felt B.demanded C.imagined D.proved 11A.attack B.injury C.support D.refusal 12A.setup B.calledup C.broughtup D.tookup 13A.recyclable B.useless C.precious D.harmful 14A.trade B.goal C.course D.limit 15A.school B.parents C.accounts D.materials 16A.selected B.removed C.explored D.collected 17A.matter B.hit C.burst D.campaign 18A.again B.just C.even D.still 19A.wastes B.plans C.services D.rules 20A.appointment B.management C.argument D.judgment
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