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某化学课外活动小组进行了一系列的实验探究，请按要求作答： （1）实验室可用Zn粒和稀硫酸制H2，甲同学按图（1）所示配制实验所需的稀硫酸，你认为他的操作是否正确？ ．（若正确，请填“正确”，若...
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D.
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某化学课外活动小组的同学利用某碱厂的碱渣含有熟石灰制取少量烧碱的化学方程式为．实验操作．
某化学课外活动小组进行了一系列的实验探究请按要求回答⑴写出图中标有①②的仪器名称①_②⑵小强想用高锰
某课外活动小组去一家废旧金属回收公司辨别生铁和废钢他们运用所学的生铁和钢的性能用途等有关知识进行辨别
某化学课外活动小组进行了一系列的实验探究请按要求作答1实验室可用锌粒和稀硫酸制甲同学按图1所示配制实
课外活动组织形式不包括下面的哪一项
全体学生参加的课外活动
少数学生参加的课外生物兴趣小组活动
个人独立进行的课外活动
教师作为主体地位的课外活动
某实验室的废液中可能含有氯化铁硫酸硫酸钠氯化钠氢氧化钠碳酸钠和硝酸钡中的一种或多种初三化学课外活动小
某化学课外活动小组对钢铁制品锈蚀的条件进行如下探究设计了如图所示的实验据此回答下列问题1一周后观察到
某课外活动小组为探究蜡烛的有关化学性质已进行了查资料内容略部分实验设计和观察及假设了部分结论假如你是
解答下列应用题4分 前进小学六年级参加课外活动小组的人数占全年级总人数的48%后来又有4人参加课外
08四川南充5分某中学化学课外活动小组的同学在实验室测定一批生理盐水中NaCl的质量分数取该生理盐水
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某化学课外活动小组对钢铁制品锈蚀的条件进行如下探究设计了如图所示的实验据此回答下列问题1一周后观察到
某校化学课外活动小组的同学在实验室的一次探究性活动中他们将50g氢氧化钠溶液与50g硫酸铜溶液混合恰
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某学校化学课外活动小组的同学取刚降到地面的雨水的水样用pH计测pH的仪器每隔10分钟测一次pH其数据
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某化学课外活动小组进行了一系列的实验探究请按要求回答1写出图中标有①②的仪器名称①②.2小强想用高锰
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Three﹣quartersoftheworld'scoffeefannsdestroyforesthabitattogrowcoffeeinthesunandtypicallyuseharmfulpesticides[杀虫剂andchemicalsthatpoisontheenvironment.Whenforestsdisappearmigratory迁徙的songbirdsdisappeartoo.InordertodealwithseverepopulationandhabitatlossSmithsonianscientistscreatedtheBirdFriendlycertification・ BirdFriendlycoffeesareshade﹣grownmeaningthecoffeeisplantedundertreesratherthanonthelandthathasbeenclearedofallotherplants.Coffeeexpertssayshade﹣growncoffeestastebetterbecausethebeansripenslowerthancoffeegrowninthefullsunresultinginarichermorecomplexflavor.BirdFriendlycertifiedcoffeesgrowunderbio﹣diverseshadethatprovideshabitatformigratorysongbirdsandotherwildlifestorescarbonandfightsclimatechange.BirdFriendlycoffeesarealsocertifiedorganicmeaningtheyaregrownwithoutpesticideswhichisbetterforpeopleandfortheplanet. BirdFriendlyproducerscanalsoearnmorefortheircrops.Thewoodandfruittreesonshadecoffeefarmsprovidefannerswithadditionalincome.EverycupofBirdFriendlycoffeepurchasedrewardsthesefarmerswithalittlemoremoneyforbeinggoodstewardsoflheenvironmentandencouragesthemtocontinueconservingBirdFriendlyhabitat. BuyingBiniFriendlysupportstheSmithsonianMigratoryBirdCenter'sconservationresearchaimedalunderstandingandprotectingyourfeatheredfriends.YoucanpurchaseBirdFriendlycertifiedcoffeesuroundtheworldandprotectwildlifeandhabitatwitheverycup.Findastoreorcafenearyouorbetteryethaveitshippedtoyourdoorwhenyouorderonline. 1Whatisthepresentsituationofcoffeefarms? A.Onefourthofthemhavedestroyedforesthabitatforbirds. B.Pesticidesandchemicalsusedonthempoisonedmanybirds. C.Fannershavebeenawareofenvironmentprotection. D.Scientistspayattentiontothemandhavecomeupwithanidea. 2Whit'sacharacteristicofBirdFriendlycoffees? A.Theymayhaveabettertaste. B.Theyhaveastrangeflavor. C.Theytakelesstimetoripen. D.Theyaregrownonunpollutedland. 3HowcanBirdFriendlyfannersearnmoremoney? A.Bychargingconsumersmoremoney. B.Bysellingfruitsandwoodfromtrees. C.Bycuttingdowntreesandsellingwood. D.Byservingasstewardsofcoffeeconsumers. 4Whatdocsthetextsuggestcoffeeconsumersdo? A.Consumelesscoffee. B.Ordercoffeeonline. C.Purchaseshade﹣growncoffee. D.Donatetocoffeefarmers.
Fromsmoothconferencecallsina1crowdtrainstationtolivebroadcastsoftownhallmeetingsandlightning﹣quickdownloadsofhigh﹣resolution高清晰的2movieShanghai'ssuperfast5Gnetworkisturningtechnologicaldreamsintoreality. Inthelatest3develop.thecity'sHongqiaoRailwayStationoneofAsia's4bigtrafficcentershaslauncheda5Gnetwork.Itwillallowpassengerstoexperiencedataspeedsupto100timesfasterthan5isavailablenow.Therailwaystation's5GnetworktheresultofteamingupwithtelecommunicationequipmentmakerHuaweiTechnologies6seeasamilestoneinShanghai'scommercial5Garrangementtobecomeadual﹣gigabandcitywithgigabit千兆宽带networkspeedsonmobileaswellasfixednetworks. Asthe5Gera7approachoneofthekeyconcernsfortelecomoperatorswillbehowtheycanuse5Gnetworkstomeettheneedsofhigh﹣densityareaswiththousandsofpeoplesimultaneously同时using8networktomakephonecallsaccesstheinternetandmakemobilepayments. ChinaMobile'sShanghaibranchtappedHuawei's5GDigitalIndoorSystem9iscurrentlytheindustry'sonly10commercialavailablesystemfor5Gindoorcoverage.TheproductdevelopedinShanghaiisnowreadyformassdelivery.
用图1所示的实验装置研究小车速度随时间变化的规律． 主要实步骤如下 a．安装好实验器材接通电源后让拖着纸带的小车沿长木板运动重复几次． b．选出一条点迹清晰的纸带接一个合适的点当作计时起点Ot＝0然后每隔相同的时间间隔T选取一个计数点如图2中ABCDEF……所示． c．通过测量计算可以得到在打ABCDE……点时小车的速度分别记作v1v2v3v4v5…… d．以速度v为纵轴时间t为横轴建立直角坐标系在坐标纸上描点如图3所示． 结合上述实验步骤请你完成下列任务 1在下列仪器和器材中还需要使用的有和填选项前的字母 A．电压合适的50Hz交流电源 B．电压可调的直流电源 C．刻度尺 D．秒表 E．天平含砝码 2在图3中已标出计数点ABDE对应的坐标点请在该图中标出计数点C对应的坐标点并画出v﹣t图象． 3观察v﹣t图象可以判断小车做匀变速直线运动其依据是．v﹣t图象斜率的物理意义是． 4描绘v﹣t图象前还不知道小车是否做匀变速直线运动．用平均速度表示各计数点的瞬时速度从理论上讲对△t的要求是选填“越小越好”或“与大小无关”从实验的角度看选取的△x大小与速度测量的误差选填“有关”或“无关”． 5早在16世纪末伽利略就猜想落体运动的速度应该是均匀变化的．当时只能靠滴水计时为此他设计了如图4所示的“斜面实验”反复做了上百次验证了他的猜想．请你结合匀变速直线运动的知识分析说明如何利用伽利略“斜面实验”检验小球的速度是随时间均匀变化的．
如图所示材料相同的物体mlm2由轻绳连接在恒定拉力F的作用下沿斜面向上加速运动．轻绳拉力的大小
Haveyoueverhadasummerjob?Thosewhohavethetimetocapitaliseonthefunsummerhastooffermaynothavethefundstodoso.Thesolution?Asummerjob. Theconceptofcash﹣strapped缺钱的studentsoverthesummerperiodisnotanewone.1Vacancies空缺canrangefromrolesasordinaryasfrycooktoseasonalworkatathemeparkoracushyjobwithcomfortableconditions.Inmanycasesthejobsonlypayminimumwagewhichmayonlytideyouover.2 Summerjobsprepareyoungpeopleforsuccessfulcareersinlaterlifeteachingvital'softskills'.saysUKWorkandPensionssecretaryEsterMcVeyintheDailyMail.IndeedwhentalkingabouttheirexperiencesofsummerjobspeopleaskedforaBBCNewsarticlesaidtheygotinvaluabletrainingandlearntskillssuchaspunctualitytoleranceandtheimportanceofhardwork.3TheUKgovernmenthasplaced20000summerjobvacanciesonitsFindaJobWebsite. 4Thepercentageofyoungpeopleworkingwhilestudyinghasmorethanhalvedsince1997fallingfrom42%to18%in2014.EsterMcVeybelievesthisisbecauseyoungpeoplearechoosingtofocusmoreoneducationratherthanearningextramoney.5.Itisn'talwayseasytogetajobas20﹣year﹣oldLibertyO'HaganastudentfromWorthingfound.Nottomentionbyworkingallsummeryoumayfeelyouhavemissedoutontheexperiencesandopportunitiesyourfriendshavehad﹣travellingandhavingfun. A.Butthatisn'ttheonlyproblem. B.Asummerjobmaynotbeadreamjob. C.Thismovecomesatatimeofapparentneed. D.Theseopportunitiesarethoughttobeveryimportant. E.Butthemoneyisnottheonlythingthat'sgained. F.Andthereareopportunitiesoutthereforthosewhowanttoearn. G.summerisaheadyperiodwhereeducationstopsandfunbegins.
JoinAAAStounlockaccesstothelatestsciencenewsandresearch﹣andtosupportthepeoplemakingithappen. WhenyoujoinAAASthepublisherofScienceyou'renotjustgettingthelatestnewsandresearchfromacrosstheglobe.Youalsobecomepartoftheworld'slargestgeneralscientificsociety﹣arealcommunityofscientistsandsciencesupporters. Yourmembershiphelpsusmaintainsupportforscienceeducationadvocateforresponsiblepublicpoliciesandadvancescienceforthebenefitofa11. Allmembershipsinclude50issuesofSciencewithyourchoiceofprintordistaldelivery.You'llalsogetunlimitedaccesstoallouronlinearticlesatsciencemag.Org﹣fromanydeviceandanywhere﹣andlotsofotherexclusiveAAASbenefits. Becomeamembertodayforaslittleas﹩50andwe'11a1sosendyoualimited﹣editionT﹣shirt﹣butonlywhilesupplieslast.Hurryandjoinnow! PleasechooseyourAAASmembershipandSciencedeliverytype. AllmembershipsincludeweeklyissuesofScienceunlimitedaccesstoScienceNewsonlineandotherexclusiveAAASbenefits. 1WhatextrabenefitwillyougetifyoubecomeamemberofAAASrightnow? A.﹩50asareward. B.50issuesofScience. C.Alimited﹣editionT﹣shirt. D.Unlimitedaccesstoonlinearticles. 2Whichmembershiptypechargesthemostfordigitaldelivery? A.Regular. B.PostDoc. C.Retired. D.ScienceAdvocate. 3What'sthepurposeofthetext? A.Tointroduceamagazine. B.ToinvitepeopletojoinAAAS. C.Toadvertiseawebsite. D.ToshowAAASmemberbenefits.
About6yearsagoIwasonaplanenexttoawoman・Iwastiredandwantedtotakeanap.ButbeforeIcouldgointoignorepatternshetappedmeontheshouldertointroduceherself. HimynameisHelga! WegottotalkingandeventuallyitcameupthatIhadstartedanorganizationinhighschoolcalledR.A.K.E.RandomActsofKindnessEtc..AsIdescribedwhatwedidHelgagotveryseriousandtoldmethatsheadmiredmeforthat.Shetoldmeastoryaboutthelasttimeshehadflown.ShewasonthewaytoArizonabecauseshehadgottensuddennewsthatherdad'shealthwasonthedecline.Laterherfather'sphysiciancalledtoinformherthatherdadhadrathersuddenlypassedaway.Forthe3﹣hourplanerideshesatinsilencearoundstrangers. WhenshearrivedattheairportinArizonashewalkedtothenearestwallsatdownandcriedAndhereisthepartI'llneverforgeaboutHelga'sstoiy.For2hoursshesatandweptwhilethousandswalkedtoandfrointheairport.HelgnlookedatmeandsaidHoustonnolasinglepersonstoppedandaskedifIwasokaythatduy.ItwasthatdaythatIrealizedhownnichwe!iccdeachother.ItwasthatdayIrealizedthatkindnessisn'tnormal. Kindnessisn'tnornnal.Thathasstuckwithmealltheseyearsespeciallynow.Iworkinschiwlsnationwidespeakingaboutsympathykindnessempathy同理心andlove.I'mremindedallthetimethatformanyofkindnessisnolusuallyourdefaultsetting.Wespendsomuchtimeworryingaboutourproblemsourlivesourinsecuritiesgettingtoourflightsowewalkbyorignorepeopleinneedofhelp.SoI'vemadeitmymissiontodomypartinsharingstorieswithstudentsteachersandparentsaboutourneedforcharacterantisympathy・I'malwaysbeonthelookoutforthelittleopportunitiesthatsurroundmeeverydaytodosomethingnice・ 1WhatimpressedtheauthormostaboutHelgastory? A.Helga'sanxietyoverherfather'ssuddenillness. B.HelgahadnoonetotalktoonherflighttoArizona. C.Helgawasignoredbypeoplearoundherwhenshecried. D.Helgacouldn'tgetoverhersadnessoverherfather'sdeath. 2Whichcanbestexplaintheunderlinedpartdefaultsettinginparagraph5? A.Usualwayofdoingthings B.Unexpectedwaytodothings C.Ignorancetopeoplearound D.Biggestsurprisetoothers 3Whatcanweknowabouttheauthor? A.Hestartedmanyclubsinhighschool. B.Heusedtobeaschoolteacher. C.Heteacheskidshowtobehavewell. D.Heisapromoterofagoodcause. 4Whatcanbeasuitabletitleforthetext? A.ComfortingPeopleinNeed B.MakingKindnessNormal C.IgnoringUnnecessaryTroubles D.PractisingKindnessonthePlane
下列五幅图分别对应五种说法其中正确的是
假定你是学校英语报的兼职编辑李华.最近该报开设了YourFeelings专栏column.请用英语写一篇短文介绍开设该专栏的目的交流情感专栏内容有关心理健康的文章及解答心理问题并号召同学们投稿. 注意 1.词数100左右 2.可适当增加细节以使行文连贯.
关于近代物理知识下列说法正确的是
一列简谐横波沿x轴正方向传播在t＝0和t＝0.20s时的波形分别如图中实线和虚线所示．已知该波的周期T＞0.20s．下列说法正确的是
Imagineafuturewhereallfarmingisdonebymachineandhumansneversetfootinthefields.InShropshireintheUKengineersintheHandsFreeHectareprojectaredevelopingautomatedtractorsanddronestogrowandharvestcrops.Andtheirexperimentisnotaloneagriculturalroboticsisaboomingsector行业. Onereasonwhythesectorisontheupisthatglobaldemandforfoodisrapidlyincreasing.TheWorldBankestimateswewillneedtoproduce50%morefoodby2050iftheplanet'spopulationcontinuestogrowatitscurrentspeed.Addtothistotheforecastthatyields产量willdecreasebyoveraquarterduetoclimatechangeandthesituationlooksserious.Couldfuturisticfarmingprovidetheanswer? OnecompanyinJapanbelievesso.ThefirmSpreadhasdispensedwithfarmingonlandaltogetherandinsteadgrowsvegetablesonstacksoftraysindoorsinanautomatedfactory.IncountrieslikeJapanwherelandisactuallyaveryscarceresourceitmakesmoresensetostackyourproductionjustlikeaskyscrapersaysJJPriceSpread'sglobalmarketmanager.Mr.PricetoldtheBBCthatthismethodofvertical垂直的farmingnotonlyreducescostsby50%butitisalsogreener.LEDlightscutenergybillsbyathirdand98%ofwatercanberecycled.Bygrowingcropsclosetowherepeopleconsumethemtransportcostsandemissionsarealsominimisedhesays. Andwherewillwebuythisfuturisticfood?Perhapsinshopswithnostaff?AmazonhasrecentlylauncheditsfirstAmazonGostoreintheUSwhichhasnocheckouts.Customerssimplypicktheiritemsfromtheshelvesandtechnologydoestherest. Allthisbegsthequestionifeverythingisautomatedwhatjobswillpeopledo?Themechanisationoffarmingmeansfewerandfewerpeopleworktheland.From1950to2010agriculturallabourershavedecreasedfrom81%to48.2%oftheworkforceindevelopingcountriesandfrom35%to4.2%indevelopedcountries.It'satrendthatlookssettocontinue. 1Whydopeopledevelopagriculturalrobotics? A.Tochangetheclimate. B.Toliberatetheworkforce. C.Tocontrolthepopulationgrowth. D.Tomeettheincreasingdemandforfood. 2Whichofthefollowingisclosestinmeaningtotheunderlinedwordsinparagraph3? A.changed B.developed C.doneawaywith D.takenup 3WhydoesMr.PricethinkverticalfarmingmakesparticularsenseinJapan? A.Workforceistoolimited. B.Transportcostmaydecrease. C.Thereissolittlelandavailableforfarming. D.Thetechnologyhasreachedahighlevel. 4Whatcanbethebesttitleforthetext? A.Farmingtechnology B.Thefutureoffoodproduction C.Employmenttrend D.Futureshopswithnostaff
如图甲所示质量均为m＝0.5kg的相同物块P和Q可视为质点分别静止在水平地面上AC两点P在按图乙所示随时间变化的水平力F作用下由静止开始向右运动3s末撤去力F此时P运动到B点之后继续滑行并与Q发生弹性碰撞已知BC两点间的距离为L＝3.75mPQ与地面间的动摩擦因数均为μ＝0.2取g＝10m/s2求 1P到达B点时的速度大小v及其与Q碰撞前瞬间的速度大小v1 2Q运动的时间t．
Whenmyfathermarriedmymotherin1943hegavemymothera1937crowncoinandtoldhertokeepitinthebackofherpurseandnotspendit.Thiswouldmeanthatshealwaysfeltthatshewasprotectedandwouldalwayshavemoneyifshereallyneededit. WhenIwasmarriedin1970myhusbandwhohadheardthisstoryobtaineda1937crownformeandIhavealwayskeptitinmywalletandIhavealwayshadenoughformyneeds. Afriendrecentlyfellonhardtimespartlythroughexternal外部的circumstancesandpartlythroughpoorplanning.FriendsandIhaveloanedhermoneypaidherbillsevengivenherfoodandtriedtoteachherbudgettechniquesbutnoneofthemhasbeenasolution.Shehasjustslippeddeeperanddeeperintofinancialtroubleanddepression. Lastweekshelookedpaleandunwellverydepressedandhopeless.Ithenthoughtabouthowthecrownareminderofanother'scareandlovehadprotectedmesoIwenttothebankfora﹩100dollarbill.Itoldmyfriendthestoryandaskedhertokeepthe﹩100inthebackofherwallet.Itturnedoutthatshedidn'thaveawalletsosheputthemoneyinalittlepencilcasewhereshekepthercoins.Sheimmediatelyfeltbetter.Ifeelrichandthankyouforbeingagoodfriendshesaidandwewerebothabitteary. Thereasonforpassingthisonisnottopraiseanygenerosityonmypartbuttoshowthepowerofrandomactsofkindness.IwenthomeandrememberedalittlewalletIhadthatI'dneverusedandthoughtI'llgivethattomyfriend.Iopeneditandinsidefound﹩100.Theuniverseisveryjustandifyourheartisopentherewardalwayscomes. 1Whatdidthe1937crowncoinfromtheauthor'sfathermeantohermother? A.Hisconcernforher. B.Hispityandprotectionforher. C.Hiscareandloveforher. D.Hisprideandrespectforher. 2Wheredidtheauthor'sfriendkeepthe﹩100dollar﹣bill? A.Inthebackofherwallet. B.Inalittlepencilcase. C.Inthepocketofherraincoat. D.Inthelayerofhersuitcase. 3WhatcanheinferredfromthelastParagraph? A.Theauthorbecamerichallofasudden. B.Theauthor'sfriendwouldreceiveawalletasagift. C.Theauthor'sfriendwasnottouchedbyherstory. D.Theauthorfeltuncomfortablewhenreceivingthebill. 4Whatcanbethebesttitleforthetext? A.Ahardlife B.Thehelptoafriend C.Acrowncoin D.Agiftfrommyfather
质谱仪是一种测量带电粒子质量和分析同位素的重要工具它的构造原理如图离子源A产生电荷量相同而质量不同的离子束初速度可视为零从狭缝S1进入电场经电压为U的加速电场加速后再通过狭缝S2从小孔垂直MN射入圆形匀强磁场．该匀强磁场的磁感应强度为B方向垂直于纸面向外半径为R磁场边界与直线MN相切E为切点．离子离开磁场最终到达感光底片MN上设离子电荷量为q到达感光底片上的点与E点的距离为x不计重力可以判断
假如你是李华五月份去美国参加国际文化周你的美国笔友Tom来信询问你赴美相关事宜.请你写一封回信内容包括 1.活动时间地点 2.活动的内容 3.其他个人安排. 注意 1.词数100左右. 2.可适当增加细节以使行文连贯. 参考词汇InternationalCultureweek国际文化周
假如你是校学生会__李华暑期拟组织部分学生去英国进行为期一周的研学游travelstudy活动已起草了活动方案.给你的英国网友Mr.Smith写信征求他对方案的意见及建议并询问相关注意事项. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
中国科学家发现了量子反常霍尔效应杨振宁称这一发现是诺贝尔奖级的成果．如图所示厚度为h宽度为d的金属导体当磁场方向与电流方向垂直时在导体上下表面会产生电势差这种现象称为霍尔效应．下列说法正确的是
质量均为m＝lkg的甲乙两个物体同时从同地沿同一方向做直线运动二者的动能随位移的变化图象如图所示．下列说法正确的是
如图所示电源电动势为E内阴为r．电路中的R1为光敏电阻其阻值光照强度增大而减小R2为定值电阻．当开关S闭合时下列说法正确的是
InastudyrecentlypublishedinthejournalNeuronresearchersfoundthatsupermemorizersdonthaveunusuallylargebrainregionsthatallowthemtorememberalotofinformation.1Hereareafewoftheirfavoritetricksthatcanhelpyoutorememberthingsinyoureverydaylife. ToRememberNewwords TechniqueChangeroutine Inastudyagroupofstudentsstudiedalistofwordsintwoseparatesessions.Somestudiedinamessyroomandsomeinaneatspace.Onegroupofstudentsspentbothsessionsinthesameroomwhiletheothersplitthesessionsbetweenthetwoenvironments.Duringatestthestudentswhostudiedinmultipleplacesrememberedmuchmore.2Thatincludesthetimeofdaythemusicinthebackgroundwhetheryousitorstandetc. ToRememberYourPIN TechniqueCountitout Youcoulduseyourbirthdayoryourphonenumberbutidentitythieveshaveawayoffiguringthosenumbersout.3Writeafour—wordsentencethencountthenumberoflettersineachword.ForinstanceThisismyPIN＝4223. ToRememberFaces TechniqueFocusonnoses Whilesomesupermemorizersspecializeinassociatingnameswithfacesthememory—palacetechniquedoesn'tworkaswelliftheimageofthefaceischangedinanyway.Ratherthanfocusingoneyesasmostpeopledofocusonthecentreortotheleftofapersonsnose.4 ToRememberFacts&figures Technique5 Tolearnandrememberstatisticsreviewingthematerialrepeatedlyoveralongertimeisfarmoreeffectivethanrepeatingitinashorterone.Ifyourexamisinaweekstudytodayandthenagaininadayortwo.Ifitsamonthawaystudytodayandthenwaitaweekbeforeyoursecondsession. A.Valueexams. B.Giveyourselftime. C.Thisallowsyoutotakeintheirwholeface. D.Theirbrainstructuresareinfactthesameastherestofours. E.InsteadtrythistipfromDominicaneight—timeWorldMemoryChampion. F.Thetheoryisthatyourbrainlinksthewordstotheenvironmentaroundyou. G.Studiesshowedthatvaryingotheraspectsofyourenvironmentcanalsohelp.
QianZhongshuwasaChinesescholarandwriterknownforhiswitanderudition博学.DespitefailinginmathematicsQian1successenteredtheDepartmentofForeignLanguagesunderTsinghuaUniversityin1929becauseofhis2excellenceperformanceinChineseandEnglishlanguages.InTsinghuahemethiswifeYangJiangwhowastobecomeasuccessfulplaywrightandtranslatorand3marryherin1935.InthesameyearQianreceivedgovernmentsponsorship4promotehisstudiesabroad.TogetherwithhiswifeQianheadedfortheUniversityofOxfordinBritain.After5spendtwoyearsatExeterCollegehereceivedabachelorofliterature.HestudiedforonemoreyearintheUniversityofParisinFranceandhedidn'treturntoChina61938. QianlivedinShanghaifrom1941to19457wasthenunderJapaneseoccupation.Atthattimehedevoted8hetowritingandmanyofhisworkswerewrittenorpublishedthen.Acollectionofshort9essayWritingintheMarginsofLifewaspublishedin1941.HismostcelebratedworkFortressBesiegedappearedin1947.OntheArtofPoetrywritten10classicalChinesewasissuedin1948.
下列说法中正确的是
一列横波沿x轴正方向传播在t＝0时刻的波形曲线如图所示．已知这列波的质点P从t＝0时刻起第一次达到波峰的时间为0.6s质点PQ的坐标分别为10和70则有
Chinesehigh—speedrailwayareavery1comfortwaytotravel.Theyarecleanquietandefficient.Chinahasledotherdevelopingcountriesandevensomedevelopedonesinthisfieldsincethefirsthigh—speedtrain2comeintousein2008. Thestationsare3mainbuiltoutsidethetowncentrebutlocaltransporthasbeenlengthened4connectthehigh—speednetwork.Thefacilitiesonthetrainarenewandthestaffarewelltrained.Eventhesecondclass5chairprovideplentyofspace.Thepassengersaresowide6youcanmovewithoutdisturbinganyone.Youcanuseyourmobilephoneaccess7Internetorworkonyourlaptop.Thereisalsoarestaurantcarthoughthekindsoffood8belimited.Thetoiletsarelargecleananduser—friendlytoo.Thetrainalmostdoesntrock.Evenwhenthetrainbrakesyoucanhardlyfeelitshake. What'smorewithafastercheck—inthehigh—speedtrainsarealso9littleaffectedbyweatherthanplanes.Seldomare10delayedorcancelledforweathercondition.Thereforetheyhavebecomethefirstchoiceformanypassengers.
Knowingwhattodoatcheckoutandproperlypreparingforitcanturnapotentiallyheatedsituationintoaquickthankyouaddgoodbye.Belowwemadealistoffivethingsyoushouldrememberathotelcheckout. Don'tbelatetocheck Hotelsmayaddanextremelyhighpriceforbeingjustahalfhourlate.Ifyouknowyouwon'tmakethecutofftimeitneverhurtstocallaheadandtrytonegotiateawayapotentialcharge. Don'tforgettodoublecheektheroomandsafe Makesureyoudon'tleavethingsbehind.Ifyouhaveanearlyflightorcheckouttimepackupasmuchasyoucanthenightbeforesothatlast—minuterushisn'ttooannoying.Alsobesuretotakeoutanythingintheroomsafe. Don'tforgettotipthehousekeepers It'salwayspolitetoleavesomemoneyforthepeoplekeepingyourroomclean. Don'tignorethedetailedbill Youmaybeinarushbutgivethedetailedhillacarefullooktoseeifthehotelchargeisdifferentfromtherateyouinitiallybooked. Don'tgetangry Shootingattheassistantmanagerstandingbehindthefrontdeskprobablywon'thelp. Whendealingwithanunexpecteditemonthebill.Thinkabouthowdifficultitcanbetodealwithannoyedcustomers.Keepcalmandthingsmaybesolvedbetterandsooner. 1Thehotelwillchargeyoumoremoneyifyou. A.checkbeforecutofftime B.donotcallthehotelahead C.arelateincheckingout D.negotiatewiththeclerks 2Whichofthefollowingdoestheauthorsuggestdoing? A.Leavingsomethingbehind. B.Beingsuretokeeptheroomclean. C.Doingthepack—upasearlyaspossible. D.Tippingthehousekeeperstoshitrespect. 3Whatisthepurposeofthelastparagraphofthepassage? A.Tosuggestawaytosolveproblemsproperly B.Toprovidemoreinformationaboutthehotel. C.Toshowtheuneasinessofassistantmanagers D.Toprotectcustomersfromunnecessarydangers. 4Inwhichsectionofthemagazinecanyouprobablyfindsuchapassage? A.Fitness. B.Nature. C.Lifestyle. D.Travel.
探究力对物体做的功与物体获得的速度的关系实验装置如图俯视图关于实验主要过程说法正确的是
Itisgenerallyacknowledgedthatyoungpeoplefrompoorersocio—economicbackgroundstendtodolesswellintheeducationsystem.InanattempttohelpthechildrenofpoorfamiliesanationwideprogramcalledHeadstartwasstartedintheUSin1965.Alotofmoneywaspouredintoit.Ittookchildrenintopre—schoolinstitutionsattheageofthreeandwassupposedtohelpthemsucceedinschool.Buttheresultshavebeendisappointingbecausetheprogrambegantoolate.Manychildrenwhoentereditatthreewerealreadybehindtheirpeersinlanguageandintelligenceandtheparentswerenotinvolvedintheprocess.AttheendofeachdayHeadstartchildrenreturnedtothesamedisadvantagedhomeenvironment. ToimprovetheresultsanotherprogramwasstartedinMissourithatconcentratedonparentsasthechild'sfirstteachers.Thisprogramwasbasedonresearchshowingthatworkingwiththefamilyisthemosteffectivewayofhelpingchildrengetthebestpossiblestartinlife.Thefour—yearstudyincluded380familieswhowereabouttohavetheirfirstchildandrepresenteddifferentsocial—economicstatusageandfamilystructure.Theprograminvolvedtrainededucatorsvisitingandworkingwiththeparentorparentsandthechild.Theprogramalsogavetheparentssomeguidanceandusefulskillsonchilddevelopment. AtthreethechildreninvolvedintheMissouriprogramwereevaluatedwiththechildrenselectedfromthesamesocio—economicbackgroundandfamilysituations.Theresultswereobvious.Thechildrenintheprogramweremoreadvancedinlanguagedevelopmentproblemsolvingandotherintellectualskillsthantheirpeers.Theyperformedequallywellregardlessofsocio—economicbackgroundsorfamilystructure.Theonefactorthatwasfoundtoaffectthechild'sdevelopmentwasthepoorqualityofparent—childinteraction.Thatinteractionwasnotnecessarilybadinpoorerfamilies. TheMissouriprogramcomparesquitedistinctlywiththeHeadstartprogram.Withoutasimilarfocusonparenteducationandonthevitalimportanceofthefirstthreeyearssomeevidenceindicatesthatitwillnotbeenoughtoovercomeeducationalunfairness. 1WhatcausedthefailureoftheHeadstartprogram? A.Thelargenumberofpoorfamilies. B.Thedisapprovalfromchildren. C.Thelatestartoftheprogram. D.Thelongperiodoftime. 2WhatdoweknowabouttheMissouriprogram? A.Itfocusedonthechildren'sfirstschoolteachers. B.Ithelpedthechildrenreturntothesamehome. C.Itmadethechildrenimprovedinmanyaspects. D.Itgavetheparentsadviceontheirdevelopment. 3Accordingtothepassagewhatislikelytoinfluencechildren'sperformance? A.Thenumberoffamilymembers. B.Theparent—childcommunication. C.Theintelligenceoftheirparents. D.Theteacher—studentrelationship. 4Howdoestheauthordevelopthepassage? A.Bylistingfigures. B.Bymakingcomparisons. C.Bygivingexamples. D.Bydrawingconclusions.
质量m＝1.0kg的物块A可视为支点轻弹簧的上端连接弹簧下端固定在光滑斜面底端斜面的倾斜角θ＝30°．平衡时弹簧的压缩量为x＝0.20m此时具有的弹性势能Ep＝0.50J物块A处在O时弹簧为原长如图所示．一质量m＝1.0kg物块B可视为质点从距离物块A为d＝2.0m处从静止开始沿斜面下滑与物体A发生碰撞后立刻一起向下运动但不粘连它们到达最低点后又向上运动．g＝10m/s2求 1物块B与物体A碰撞后的速度 2物块B向上运动到达的最高点与O的距离s．
Unitthe1980sscientistsweretrainedtoignoreanimalpainaccordingtothebeliefthattheabilitytofeelpainwasassociatedonlywithhigherconsciousness.Howevertodayscientistsviewhumansasaspeciesofanimalsandlargelyacceptthatmanyspeciesarecapableofsomelevelofself﹣awareness.1 Ifyouhitanotherpersoninthefaceyoucanestimatetheirpainlevelbywhattheydoorsayinresponse.2Graduallyscientistshavedevelopedasetofindicatorsofpainresponseinnon﹣humananimals.Demonstratingaresponsetoanegativestimulationanddisplayingprotectivebehaviorofinjuredareasaretwomajorsigns. 3Someresearchersarguelobsters龙虾aretoodissimilartovertebrates脊椎动物tofeelpain.Nonethelesslobstersdosatisfyallofthestandardsforapainresponse.Lobstersguardtheirinjuriesandlearntoavoiddangeroussituations.Theyareevenbelievedtopossesssomelevelofconsciousness.Inresulttodaymostscientistsagreethatinjuringalobstercausesphysicalpain. Duetogrowingevidencethatthelobstersmayfeelpainitisnowillegaltoboillobstersaliveorkeepthemoniceinsomecountries.Eveninlocationswhereboilinglobstersremainslegalmanyrestaurantsprefermorehumanemethods.4Tosatisfypickydinersmorerestaurantsruleoutthecruelcookingmethods. CurrentlythemosthumanetoolforcookingalobsteristheCrustaStun.Thisdeviceelectrocutes电击alobster.5Thefollowingprocessofcookingissuretocausenopain.Incontrastittakesabout2minutesforalobstertodiefromboilingwaterduringwhichtimepainlasts. A.Buthugedisagreementexists. B.Thecreatureinstantlylosesconsciousnessinhalfasecond. C.Itbeatstheformermethodbysavingchefs'effortincleaningthecreature. D.It'sdifficulttoassesspaininotherspeciesbecausewecannotcommunicateaseasily. E.Peoplearecomingtorealizethatotherspeciesmightalsoenjoytheluxuryofemotion. F.Exceptformoralconsiderationmanychefsbelievestressnegativelyaffectstheflavor味道ofthemeat. G.Legalprohibitionbecomesthemajorconsiderationforrestaurantswhenchoosingacookingmethod.
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