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用水平力F1拉动如图所示装置，使木板A在粗糙水平面上向右匀速运动，物块B在木板A上表面相对地面静止，连接B与竖直墙壁之间的水平绳的拉力大小为F2．不计滑轮重和绳重，滑轮轴光滑．则F1与F2的大小关系...
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如图所示
B两相同长方体木块放在水平面上，它们的高度相等，长木板C放在它们上面.用水平力F拉木块A，使A.
C一起沿水平面向右匀速运动，则( ) A.A对C的摩擦力向左 B.C对A的摩擦力向左
B对C的摩擦力向右
C对B的摩擦力向左
图a表示用水平恒力F拉动水平面上的物体使其做匀加速运动.当改变拉力的大小时相对应的匀加速运动的加速度
在水平面上用水平力F.拉物体从静止开始做匀加速直线运动当速度达到v时撤掉F.物体在水平面上滑行直到停
如图所示一质量M.=2.0kg的长木板静止放在光滑水平面上在木板的右端放一质量m=1.0kg可看作质
如图所示
B.两物块叠放在一起，在粗糙的水平面上保持相对静止地向右做匀减速直线运动，运动过程中
受到的摩擦力 （ ） A.方向向左，大小不变B.方向向左，逐渐减小
方向向右，大小不变
方向向右，逐渐减小
如图所示一质量M.=2.0kg的长木板静止放在光滑水平面上在木板的右端放一质量m=1.0kg可看作质
如图所示质量为m1=2kg的木板A放在水平面上木板与水平面间的动摩擦因数为μ1=0.1木板在F=7N
如图所示
B.两长方体木块放在水平面上，它们的高度相等，长木板C.放在它们上面.用水平力F.拉木块A.，使A.
C.一起沿水平面向右匀速运动，则( ).【4】
(A.)A.对
的摩擦力向右(B.)C.对A.的摩擦力向右(C.)B.对C.的摩擦力向右(
)C.对B.的摩擦力向右
在水平面上用水平力F拉物体从静止开始做匀加速直线运动当速度达到v时撤掉F物体在水平面上滑行直到停止物
如图所示AB两物体叠放在一起在粗糙水平面上向左做匀减速运动运动过程中B.受到的摩擦力
方向向左，保持不变
方向向右，保持不变
方向向左，逐渐减小
方向向右，逐渐减小；
用力F.拉一物体使其以加速度a在水平面上做匀加速直线运动力F.的水平分量为F1如图所示若以与F1大小
当水平面光滑时，a’
当水平面光滑时，a’＝a
当水平面粗糙时，a’
当水平面粗糙时，a’>a
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动，再向右运动
物块向右运动，速度逐渐增大，直到做匀速运动
木板向右运动，速度逐渐变大，直到做匀速运动
木板和物块的速度都逐渐变小，直到为零
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动，再向右运动
物块向右运动，速度逐渐增大，直到做匀速运动
木板向右运动，速度逐渐变小，直到做匀速运动
木板和物块的速度都逐渐变小，直到为零
如图所示木块B.放在粗糙的水平面上木块
放在
的上面,A的右端通过一不可伸长的轻绳固定在竖直墙上,用水平恒力F.向左拉动B.,使其以速度v做匀速运动,此时绳水平且拉力大小为T.,下面说法正确的是 A.绳子拉力T.与水平恒力F.大小相等 B.木块A.受到的是静摩擦力,大小等于T.
木板B.受到一个静摩擦力,一个滑动摩擦力,合力大小等于F.
若木板B.以2v匀速运动,则拉力仍为F.
如图所示用水平力F.拉
物体在光滑的水平面上沿直线移动s，做功W
1
；用同样的力F.拉
物体在粗糙的水平面上沿直线也移动s，做功W
2
.则（ ） A.W
1
＞W
2
B.W
1
=W
2
W
1
＜W
2
无法比较
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动，再向右运动
物块向右运动，速度逐渐增大，直到做匀速运动
木板向右运动，速度逐渐变小，直到做匀速运动
木板和物块的速度都逐渐变小，直到为零
如图所示木板B.放在粗糙水平面上木块
放在
的上面，A.的右端通过一不可伸长的轻绳固定在竖直墙上。现用水平恒力F.向左拉动B.，使其以速度v做匀速运动，此时绳水平且拉力大小为T.，下面说法正确的是( ) A.绳上拉力T.与水平恒力F.大小相等 B.木板B.受到一个静摩擦力，一个滑动摩擦力，合力大小等于F.
若用恒力以2F.向左拉动长木板，则木块A.给木板B.的滑动摩擦力等于T.
若木板B.以2v匀速运动，则拉力仍为F.
如图所示一足够长的木板静止在光滑水平面上一物块静止在木板上木板和物块间有摩擦现用水平力向右拉木板当物
物块先向左运动，再向右运动
物块向右运动，速度逐渐增大，直到做匀速运动
木板向右运动，速度逐渐变小，直到做匀速运动
木板和物块的速度都逐渐变小，直到为零
如图所示用水平力F.拉
物体在光滑的水平面上沿直线移动s，做功W
1
；用同样的力F.拉
物体在粗糙的水平面上沿直线也移动s，做功W
2
.则 （ ） A.W
1
＞W
2
B.W
1
=W
2
W
1
＜W
2
无法比较
如图所示
B.两相同长方体木块放在水平面上，它们的高度相等，长木板C.放在它们上面。用水平力F.拉木块A.，使A.
C.一起沿水平面向右匀速运动，则 （ ） A.A.对
的摩擦力向左 B.B.对C.的摩擦力向右 C.C.对A.的摩擦力向左
C.对B.的摩擦力向左
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30分第一节完形填空 UsingpublictoiletsinChinacanoftenbeachallengingundertakingparticularlyforthosenotpracticedintheartofsittingdeep.41researchersinChinahavecomeupwithanew42thattheysaycanhelp43apoisonousproblembotheringChina'spublictoiletstheoverpoweringodor恶臭. Unlikechemicalsolutions44areexpensiveandcan45theenvironmentthenewbiotreatmentisbeingthoughtasacost﹣effectivewayofprotectingtheenvironmentto4675percentofthebadsmellinbathroomsaccordingtoresearchersfromtheChineseAcademyofSciences.The47behindthetreatmentliesinaspecial48oftwotypesofbacteria﹣﹣﹣lactobacilliussp乳杆菌类细菌andstreptococcusthermopiles嗜热链球菌﹣﹣﹣aswellastheelementsoforanges.Thepreparedmixturewhichcomesinliquidorpowderformfeedsonhumanwastewhenappliedthus49thegrowthofodor﹣makingbacteria.Howevernotyetavailablein50theodor﹣killingtechnologyisstillundergoing51.Manyexperimentswiththesolutionarebeing52intheHuanglongNaturePreserveandJiuzhaigouNationalPark. Wecanseethetechnologyisespeciallysuitedforuseinthenonflushing非冲水toiletsoftenfoundinthesetypesofnaturepreservessincewaterregulationsintheseareasareoftenvery53andpipesaredifficultto54.Portablebathroomswhile55arerelativelyexpensivetomaintaincomparedwiththebiosolution. Thisway56canseethatnotonlyareyour57nicebutthetoiletsandtheotherfacilitiesatthesitearepleasantaswellandthetechnologyhasother58aswellsuchasthetreatmentofrubbishsaidtheadministratorofJiuzhaigouNationalPark. If59toitseffectivenessprovetruethetechnologyislikelytobe60bytheChinesehealthauthorities. 41.A.Because B.If C.But D.While 42.A.technology B.way C.machine D.psychology 43.A.confirm B.analyze C.findout D.dealwith 44.A.which B.they C.that D.those 45.A.benefit B.protect C.harm D.influence 46.A.leadto B.takein C.keepout D.makeuseof 47.A.identity B.science C.instruction D.procedure 48.A.seed B.poison C.mixture D.discovery 49.A.preventing B.keeping C.causing D.forbidding 50.A.gardens B.forests C.homes D.supermarkets 51.A.discussing B.using C.testing D.analyzing 52.A.planned B.simplified C.classified D.debated 53.A.strict B.harmonious C.drafted D.canceled 54.A.polish B.twist C.make D.fix 55.A.optional B.clean C.superb D.convenient 56.A.lawyers B.tourists C.burglars D.merchants 57.A.goods B.animals C.mountains D.guides 58.A.phenomena B.disadvantages C.applications D.characteristics 59.A.results B.guesses C.doubts D.claims 60.A.accepted B.refused C.abandoned D.banned
6分DearGod NowthatIamnolongeryoungIhavefriendswhosemothershavepassedaway.Ihaveheardthesesonsanddaughterssaytheyneverfullyappreciatedtheirmothersuntilitwastoolatetotellthem. Iamblessedwiththedearmotherwhoisstillalive.Iappreciatehermoreeachday.MymotherdoesnotchangebutIdo.AsIgrowolderandwiserIrealizewhatanextraordinarypersonsheis.HowsadthatImunabletospeakthesewordsinherpresencebuttheyfloweasilyfrommypen. HowdoesadaughterbegintothankhermotherforlifeitselfForthelovepatienceandjusthardworkthatgointoraisingachildForrunningafteratoddlerforunderstandingamoodyteenagerfortoleratingacollegestudentwhoknowseverythingForwaitingforthedaywhenadaughterrealizeshowwisehermotherreallyis HowdoesagrownwomanthankamotherforcontinuingtobeamotherForbeingreadywithadvicewhenaskedorremainingsilentwhenitismostappreciatedFornotsayingItoldyousowhenshecouldhaveutteredthesewordsdozensoftimesForbeingessentiallyherself﹣﹣lovingthoughtfulpatientandforgiving Idon'tknowhowdearGodexcepttoblessherasrichlyasshedeservesandtohelpmeliveuptotheexampleshehasset.IpraythatIwilllookasgoodintheeyesofmychildrenasmymotherlooksinmine. 25.Theauthorpreferstoshowappreciationtohermother. A.totellhermotherfacetoface B.tomakeacall C.nevertotellhermother D.towriteitout 26.Accordingtothelastparagraphtheauthortendsto. A.followhermother'sexample B.prayforfriends'mother C.askGodmorequestions D.showlovetohermother 27.Whatistheauthor'spurposeofwritingthepassage A.Totellushowtoraiseachild. B.Tomemorizeherfriends'mothers. C.Tothankhermotherandbeagoodmother. D.Toexpectsomethingspecialfromherchildren.
10分SocialPhobia It'snaturaltofeelnervousorshyinfrontofothersattimes.Mostpeoplemanagetogetthroughthesemomentswhentheyneedto.71It'sprobablymorethanshyness.Itmaybuildupintoapowerfulfear.Asaresultpeoplefeeluncomfortableparticipatingineverydaysocialactivities.Thisiscalledsocialphobiaalsocalledsocialanxiety. 72Itpreventsthemfromchattingwithfriendsinthelunchroomjoininganafter﹣schoolcluborgoingtoaparty.Sometimestheyevenfeeltoonervoustoaskaquestioninclassorgotoateacherforhelp.Socialphobianotonlypreventspeoplefromtryingnewthings.Italsopreventsthemfrommakingthenormaleverydaymistakesthathelppeopleimprovetheirskillsstillfurther. Itisreallysadisn'titButthegoodnewsisthatpeoplewithsocialphobiacanlearntomanagefeardevelopconfidenceandcommunicatingskillsandstopavoidingthingsthatmakethemnervous.Ofcourseit'snotalwayseasy.Dealingwithsocialphobiatakespatiencecouragetofacefearsandthewillingnesstopractice.73 Therapists治疗师canhelppeoplecreateaplanforfacingsocialfearsandbuildtheskillsandconfidencetoovercomeit.Andfamilyorfriendsareespeciallyimportantforthem.74Friendsandfamilycanencouragethemtopickasmallgoaltoaimforremindthemtogoforitandbetherewhentheymightfeeldiscouraged.Goodfriendsandfamilyaretheretocelebrateeachsmallsuccessalongtheway. Littlebylittlesomeonewhodecidestodealwithextremeshynesscanlearntobemorecomfortable.75Asshynessandfearsbegintomeltconfidenceandpositivefeelingsbuild.Prettysoonthepersonisthinkinglessaboutwhatmightfeeluncomfortableandmoreaboutwhatmightbefun. A.Friendscanovercometheirfears. B.Butforsometheanxietycanbeextreme. C.Theyarenotabletomakeeyecontactwithclassmates. D.Socialphobiamakespeoplelonelyordisappointedovermissedopportunities. E.Italsotakesacommitmenttogoforwardratherthanbackawaywhenfeelingshy. F.Eachsmallstepforwardhelpsbuildenoughconfidencetotakethenextsmallstep. G.Thesupportfromthosekeypeoplehelpsthemgatherthecouragetotrysomethingnew.
1分IgethomelateGrandmaalwaysleavesalightonforme. A.Wherever B.However C.Whenever D.Whatever
求式子÷的值其中m＝﹣2019．
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(A.)A.对 的摩擦力向右(B.)C.对A.的摩擦力向右(C.)B.对C.的摩擦力向右( )C.对B.的摩擦力向右
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