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简便计算(要求写出简算过程) 2017÷
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几百种对人体有害的物质其中一种是尼古丁其化学式为C10H14N2为了你的健康请不要吸烟.1尼古丁分子
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利用因式分解简便计算要求写出完整计算过程1.992+1.99×0.01
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关于家庭电路下列说法正确的是
在荒岛上.鲁滨逊用甘蔗酿出了美味的甘蔗酒.如果从甘蔗酒中提炼酒精需要经历的物态变化有.
请用笔画线表示导线将如图中的电灯开关和插座插座准备接大功率用电器接入家庭电路中.
LosingTouchwithNatureMayMakeYouSick Forsomethingthat'snotactuallyarecognizedmedicalcondition.Nature﹣DeficitDisorderNDDhasgottenalotofattentionsinceitwasfirstcoinedin2005.WriterRichardLouvcameupwiththeterminhisbookLastChildintheWoodsSavingOurchildrenfromNature﹣DeficitDisorder.1Louvexplainedthatchildrenwhoplayoutsideoftenarelesslikelytobecomeillstressedoraggressivecomparedtothosewhowatchalotoftelevisionandspendmostoftheirfreetimeindoor.Indeedstudiesappeartobackupthatclaimbynotingthatchildrenwhospendasignificantamountoftimeoutdoorstendtohavebettermentalandphysicalhealth.2NeverthelesstheymaybeworsenedbystayinginsidewatchingTVplayingvideogamesorbeinggluedtoasmartphone.What'smoreresearchalsosuggeststhatgettinganaturefixcanhelpboosttheimmunesystem. AccordingtoLouvtheeffectsofNDDcanbelessenedorevenreversedbymakingsureparentsencouragetheirkidstoenjoyplayingoutdoorsasmuchastheycan.3RathertheyshouldleadbyexamplespendingtimewiththemintheparkatthebeachcampinganddoingotheractivitiesLouvsaid.Headdedthatchildrenlearnmanyimportantandpracticalskillswhileinteractingwithnaturelikerisk﹣takingindependenceanddecision﹣making4.
建筑工地上起重机吊臂上的滑轮组如图所示在匀速起吊重4.2×103N的物体时物体5s内上升了6m此过程中有用功为J钢丝绳移动的速度为m/s若滑轮组的机械效率为70%则额外功为J拉力F为N其功率为W.
关于温度热量和内能下列说法正确的是
在干燥的天气里用塑料梳子梳头发现越梳头发越蓬松同时梳子还能吸引碎纸屑.前者是因为头发带选填“同”或“异”种电荷而相互后者是因为带电体有的性质.
用如图所示的装置做“探究凸透镜成像规律”实验.图甲中一束平行光射向凸透镜光屏上得到一个最小最亮的光斑未画出. 1图乙中烛焰在光屏上恰好成一清晰的像未画出则该像是倒立的实像. 2若在图乙中将凸透镜移到55cm刻度线处则将光屏移动到cm刻度线处可以再次看到清晰的像. 3若在图乙中烛焰和凸透镜之间放一近视眼镜的镜片则将光屏向选填“左”或“右”下同移动才能再次看到清晰的像. 4若在图乙中用塑料吸管对准A点沿垂直于纸面方向持续用力吹气发现光屏上“烛焰尖部”变模糊则将光屏向移动“烛焰尖部”又会变清晰.
用带电体去吸引轻小纸屑有的纸屑接触带电体后又很快弹开这是因为.如图所示是闪电电流通过避雷针的示意图此时避雷针中的电流方向是选填“大地流向云层”“云层流向大地”或“无法确定”.
Myheadwassofullofdigitalnoise1itfeltlikemybrainwasabouttoexplode.Ihadnogreaterpowerofconcentrationthanagoldfishandthelifelessstareofagoldfishaswell.AsawriterIwasashamedtoadmitthatmyloveofbookshadbeenweakenedbyabrainthatsimplycouldnotsitstill. SoatthestartofthisyearIcommittedtorestoringbookstotheplacethattheyheldinmylifebeforetheInternetbrokemybrain. Mygoalwas52booksItseemedlikeanimpossibletask.A400﹣pagebookwilltaketheaveragepersonaroundeighthourstoread.Findingthetimetoreadwasachallengebuthere'showIdidit.FirstlyIdecidedtotreatmymindlikeachild2behavebadlyandlaydownsomegroundrules.ThenIdecidedthatI3readforanhourortwoatatime4distractioneachday.ItwassomethingIhadn'tdoneinyearsanditwasscary5difficultitwas. InhisbookTheDistractedMindLarryRosensaysthatthemorewepracticespendingtimeawayfromourelectronicdevicesthe6calmandmorefocusedwebecome.AndthisiswhatIfound.AgainandagainIwouldgentlybringmyselfbacktothepageresistingtheurge7reachforthatscreen.ItookinspirationfromNikkiGemmellwhodescribesinOnQuiethowinvestinginasafetolockawayherfamily'sdevicesforlongperiodshadopenedupaspacefordeepreflection. Formefindingthatquiettimemeantfindingtimeinmydayjusttoread.Itwasadatebetweenmeandmybook.Anditmeantactivelychoosingtoreadattimes8Iordinarilywouldreachformyphone. Ireadonthetramattheparkinredatnightandonlunchbreaks. 9renewmyloveaffairwithbooksIcreatedasacredspacewhereIpressedpauseandfoundinspirationknowledgeandreflection.Inourmodernworldreadingforthesakeofreadingisnotselfish.Itisapowerfulandbeneficialwaytoslowdownandbe10.
永动机不可能制作成功最根本的原因是违背了.热量总是自发地从高温物体传到低温物体而不可能自发地从低温物体传到高温物体说明能量的转化或转移具有.
在“观察分子间的相互作用力”实验中把一块表面很干净的玻璃板挂在弹簧测力计下面使玻璃板刚好和水面接触如图所示再慢慢地提起弹簧测力计当玻璃板恰好离开水面时弹簧测力计的示数选填“大于”“小于”或“等于”玻璃板的重力该实验说明.
如图所示是一款新型节能装置﹣空气能热水器它的制热能效比制热量和压缩机所耗电能之比为41用手机通过波可以远程遥控.某同学洗一次澡用水30L则所用水的质量为kg这些水温度由12℃升高到42℃吸收的热量为J若这些热量分别由空气能热水器和电热水器效率为90%提供则空气能热水器压缩机所耗电能与电热水器所耗电能相比可节约电能J.[c水=4.2×103J/kg•℃]
图甲为探究冰熔化特点的实验装置图乙为观察“碘锤”中的物态变化实验装置.已知标准大气压下冰和碘的熔点分别是0℃和113.5℃.对比两实验有以下判断1冰和碘都经历了固态变为液态的过程2冰和碘在物态变化过程中都需要吸收热量.这两个判断
用图甲所示的实验装置做“观察水的沸腾”实验. 1按规范要求调节铁圈2的高度时选填“需要”或“不需要”点燃酒精灯. 2当水温升到92℃时每隔0.5min记录一次温度计的示数部分数据记录如下表.分析数据可知水的沸点是℃. 3在其他条件不变的情况下仅将水的质量减少重复2的实验步骤在图乙中大致画出“温度一时间”的关系图象.
家庭电路触电多为低压触电如图所示只要低压带电体就不会发生低压触电事故发生触电事故的第一时间应采取的措施是.
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ChinaandIndiaDominatetheGreeningofEarth OverthelasttwodecadestheEarthhasseenanincreaseinfoliage植物aroundtheplanetmeasuredinaverageleafareaperyearonplantsandtrees.DatafromNASAsatellitesshowsthatChinaandIndia﹣two1economieswiththeworld'sbiggestpopulations﹣are2theincreaseingreeningonland.Theeffectcomesmostlyfrom3tree﹣plantingprogramsinChinaandintensiveagricultureinbothcountries. ResearchersfromBostonUniversityfoundthatglobalgreenleafareahasincreasedbyfivepercentsincetheearly2000sanarea4totheentireAmazonrainforest.ThestudywasalsopublishedinthejournalNatureSustainabilityonFebruary11.Itrevealedthatatleast25percentoftheglobalfoliage5thiscenturycameinChina. ChinaandIndia6one﹣thirdofthegreeningbutcontainonlynicepercentoftheplanet'slandareacoveredinvegetationsaidleadauthorChiChenofBostonUniversity.Thatisasurprisingfindingconsideringthegeneralideaoflanddegradation退化inpopulouscountriesfrom7. China's8contributiontotheglobalgreeningtrendcameinlargepartfromprogramstoconserveandexpandforestaccountingforabout42percentofthegreeningcontribution.Theseprogramsweredevelopedinaneffortto9theeffectsofairpollutionsoilerosionandclimatechange. Another32percentofthegreeningchangeinChinaand82percentinIndiaresultedfromintensive10offoodcrops.ThelandareausedtogrowcropsinChinaandIndiahasnotchangedmuchsincetheearly2000s.Yetbothcountrieshavegreatlyincreasedannualtotalgreenleafareaandfoodproductioninorderto11largepopulations. RamaNemaniaresearchscientistatNASA'sAmesResearchCentersawan12messageinthenewfindings.Onepeoplerealizethereisaproblemtheytendtofixithesaid.Inthe1970sand80sinIndiaandChinathesituationaroundvegetationlosswasnotgood.Inthe1990speoplerealizeditandtodaythingshaveimproved.Humansare13resilient复原快的适应力强的.That'swhatweseeinthesatellitedata. 14theresearchersrangbellsaswell.Theypointedoutthatthegaininglobalgreennessdidnot15makeupforthelossofnaturalvegetationintropicalregionslikeBrazilandIndonesia. 1A.emerging B.declining C.stimulating D.intruding 2A.imposing B.contributing C.leading D.creating 3A.fertile B.extreme C.harmonious D.ambitious 4A.distant B.equivalent C.relevant D.resistant 5A.expansion B.substitution C.innovation D.correction 6A.accountfor B.takein C.standfor D.consistof 7A.over﹣reaction B.over﹣exploitation C.over﹣generation D.over﹣explanation 8A.considerate B.tremendous C.magnificent D.irregular 9A.forbid B.investigate C.boost D.reduce 10A.cultivation B.demand C.destruction D.supply 11A.cut B.employ C.feed D.treat 12A.secret B.brief C.urgent D.positive 13A.continuously B.incredibly C.initially D.obviously 14A.Moreover B.Meanwhile C.However D.Therefore 15A.necessarily B.generally C.fortunately D.thoroughly
2019年我国航天事业取得了世界瞩目的又一项成就﹣“玉兔二号”月球车成功 登陆月球背面.图示为科技馆展厅内“玉兔二号”月球车的模型质量为36kg. 1模型车静止在水平地面上时它对地面的压力为多少牛g取10N/kg 2若车轮与地面的总接触面积为400cm2则车对地面的压强为多少帕
如图所示为一拉杆旅行箱的示意图将其视为杠杆O为支点B为重心BC为竖直方向A为拉杆端点已知箱重为250NOA为120cmOC为24cm. 1图中在A点沿图示方向施加动力F箱子静止则动力F的力臂为cm大小为N. 2使拉杆箱在图示位置静止的最小动力为N. 3生活中常把箱内较重物品靠近O点摆放这样使拉杆箱在图示位置静止的最小动力将选填“变大”“变小”或“不变”.
图中物块正水平向左滑动并压缩弹簧在O点画出物块水平方向受力示意图.
下列能源中属于可再生能源的是
晓彤在检查视力时要求人与视力表间的距离是5m.现在使用一个平面镜如图所示视力表到镜子的距离是3m晓彤到镜子的距离应该是m若此时哓彤向平面镜方向移动0.5m则晓彤到平面镜中的视力表的距离是m.
42g酒精完全燃烧放出J的热量若这些热量完全被水吸收则可将kg水从20℃加热到80℃.[酒精的热值3.0×107J/kg水的比热容4.2×103J/kg•℃]
将标有“2.5V0.3A”和“3.8V0.3A”的灯泡串联在某电源上两灯泡都正常发光将两灯泡并联在某一电源上两灯泡都正常发光选填“能”或“不能”.
利用图示甲乙装置燃烧皿内燃料和烧杯内液体未画出既可以比较不同液体的比热容又可以比较不同燃料的热值.要求仅根据温度计示数的变化完成实验则两个实验都需要控制相同的
一束光从空气射入水中用箭头标出光前进的方向注明入射光线和折射光线.
在认识透镜的学习中晓彤想知道手中的透镜是凸透镜还是凹透镜于是用手摸镜片的办法来判断晓彤的做法是的选填“合理”或“不合理”.晓彤利用太阳光测量凸透镜的焦距时凸透镜与太阳光的位置关系是.
Recyclableitemsarewastematerialsthatcanbeprocessedtomakenewproducts.Therecycledmaterialsgothroughanintenseprocessofseparatingthematerialsandconvertingintoreusableproducts.AtWasteControlweofferasuiteofon﹣siteandoff﹣siterecyclingservicestomeettheneedsofourresidentialandbusinesscustomers. ON﹣SITERECYCLINGSERVICES AttheWasteControlfacilitywehaveDrop﹣offRecyclingandBuy﹣backRecyclingCenters.Thedrop﹣offrecyclingcenterisafreeserviceandislocatednexttotheTransferStationBuildingentrance.TheBuy﹣BackRecyclingCenterislocatedonthenorthendofthefacilityandisforcustomerswishingtobereimbursed报销偿还fortheirrecyclablematerialsatcurrentmarketrates. OFF﹣SITERECYCLINGSERVICES Wealsooffermanyoff﹣siterecyclingservicestomeetyourneeds.Wemaintainfreedrop﹣offrecyclingsitesthroughoutthecommunityforcommonrecyclablematerialsandresidentialwasteoilandantifreeze.Wealsoofferoff﹣siteresidentialroadsiderecyclingandbusinessrecyclingservices. HOURS&DIRECTIONS WasteTransferStationDrop﹣offRecyclingCenter&Buy﹣backRecyclingCenter •730a.m.to530p.m.﹣﹣﹣7daysaweek BusinessOffice •800a.m.to500p.m.﹣﹣﹣MondaythroughFriday HolidayHours •TheBusinessOfficeisclosedonallmajorholidaysNewYear'sDay.July4thMemorialDayLaborDayThanksgivingandChristmas. •TheTransferStationisopenforself﹣hauledwastedrop﹣offrecyclingandbuy﹣backrecyclingforlimitedhoursduringholidays.ThefacilityisclosedChristmasDayNewYear'sDayandJuly4th﹣ifitfallsonaweekend.Thefacilityclosesat12noononMemorialDayLaborDayThanksgivingandJuly4th﹣ifitfallsonaweekday.Thefacilityisopenonallotherholidays. •WastecollectionandroadsiderecyclingservicesareuninterruptedduringholidaysexceptforChristmasDayandNewYearsDay.IfChristmasDayorNewYear'sDayfallonaweekday.therewillbenopickupontheholidayandallgarbageandrecyclingserviceswillbemovedonedayforwardfromyourregularlyscheduledpickupfortheremainderoftheweek.ForexampleifChristmasfallsonaWednesdaycustomerswithregularlyscheduledWednesdayservicewillbepickeduponThursday.CustomerswithregularlyscheduledThursdayservicewillbepickeduponFriday.CustomerswithregularlyscheduledFridayservicewillbepickeduponSaturday.MondayandTuesdayfallpriortotheholidayandwillbepickedupasregularlyscheduled. 1Ifyouwishtobepaidbackfortherecyclableitemsyoushould. A.checkthecurrentmarketratesfirst B.takethemtotheWasteControlfacility C.putthemintotheroadsiderecyclingsites D.separatethemfromwasteoilandantifreeze 2IfChristmasDayfallsonTuesdaycustomerswithregularlyscheduledTuesdayservicewillbepickedupon. A.Tuesday B.Wednesday C.Thursday D.Friday 3WhichofthefollowingstatementsisTRUE? A.Off﹣siteservicesarenotofferedtocollectbusinessrecyclablematerials. B.WasteTransferStationisopenonJuly4thmorningifitfallsonaweekend. C.Thedrop﹣offrecyclingcenterisfarawayfromthebuy﹣backrecyclingcenter. D.Thereisnoneedforresidentstopayfordroppingoffrecyclablematerials.
南京长江大桥是我市的地标性建筑现已焕然一新并顺利通车如图甲所示. 1大桥上层的公路桥全长4589填单位. 2以江面上行驶的船为参照物桥头堡是的. 3图乙中大桥上“玉兰花灯”内的钠灯全部换为LED灯后总功率减少了约180kW.与原来相比所有灯工作5h可节约电能度.
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