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实验室配制稀硫酸并用其与氧化铜反应，部分操作如图所示，其中正确的是（ ）
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已知氧化铜是一种黑色固体可溶于稀硫酸【提出问题】是稀硫酸中的哪种粒子使氧化铜溶解了呢【猜想与假设】1
向铁粉和氧化铜的混合物中加入一定量的稀硫酸微热充分反应后过滤向滤液中插入铁片有气泡产生则滤渣中一定含
向铁粉和氧化铜的混合物中加入一定量的稀硫酸微热充分反应后过滤向滤液中插入铁片有气泡产生则滤渣中一定含
实验室能够产生二氧化碳的途径有多种如碳的燃烧木炭还原氧化铜一氧化碳还原氧化铜高温分解石灰石含碳化合物
小奇同学在实验室开放日做了氧化铜和稀硫酸反应的实验后发现实验桌上有一瓶标签残缺如左下图所示的NaOH
小奇同学在实验室开放日做了氧化铜和稀硫酸反应的实验后发现实验桌上有一瓶标签残缺如左下图所示的NaOH
实验室配制一定质量分数的稀硫酸并用其除铁锈部分操作如图所示其中正确的是
可生成二氧化碳的反应很多例如①酒精的燃烧②木炭在空气中燃烧③碳与氧化铜反应④高温煅烧石灰石⑤石灰石与
①②③
③④⑤
⑥
全部
如图1是实验室制备氢气的装置图.该装置的特点是打开弹簧夹锌粒和硫酸接触发生反应.关闭弹簧夹后硫酸被反
将淀粉水解并用新制的氢氧化铜检验其水解产物的实验中要进行的主要操作是①加热②滴加稀硫酸③加入新制的氢
①→②→③→④→①
②→①→④→③→①
②→④→①→③→①
③→④→①→②→①
小明在实验室用如图所示的流程图还原氧化铜获取铜单质.求1图中A.气体为.填化学式2若实验室共有40g
下列过程中ΔH.小于零的是
氯酸钾分解制氧气
氯化铵受热分解
氢气还原氧化铜
实验室用锌和稀硫酸反应制氢气
在实验室用盐酸与氢氧化钠溶液作用研究中和反应时看不到明显的实验现象有如下做法①放弃对此问题的研究②挪
①③
③④
①④
②④
下列实验操作正确的是
锌粒放入试管
配制氯化钠溶液
氧化铜和稀硫酸反应
二氧化碳验满
实验室配制一定质量分数的稀硫酸并用其除铁锈部分操作如图所示其中正确的是
量取浓硫酸
稀释浓硫酸
装生锈铁钉
倾倒稀硫酸
某同学做氧化铜与稀硫酸反应的实验操作示意图如下其中有错误的是
加入氧化铜
倾倒稀硫酸
加热反应物
洗涤试管
将蔗糖水解并用新制的氢氧化铜悬浊液检验其水解产物的实验中要进行的主要操作是①加热②滴入稀硫酸③加入新
①→②→③→④→①
②→①→④→③→①
②→④→①→③→①
③→④→①→②→①
向铁粉和氧化铜的混合物中加入一定量的稀硫酸微热充分反应后过滤向滤液中插入铁片有气泡产生则滤渣中一定含
实验室配制一定质量分数的稀硫酸并用其除铁锈部分操作如图所示其中正确的是
实验室有如图所示的实验装置1写出图中有标号仪器的名称b2实验室制取气体时均应先检查装置的3实验室用石
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Universityeducatorslargelythinkhighlyofthewondersofteachingthroughtechnology.Howevercritics41whethersomethingislostwhenprofessorsandlecturesrelytooheavilyonelectronicmediaorwhen42withstudentstakesplaceremotely﹣﹣incyberspace网格空间43therealspaceoftheclassroom. HansUlrichGumbrechttheProfessorofLiteratureatStanfordUniversilyisonesuchcritic.Ithinkthisenthusiasticandsometimeschildishand44pushingtowardthemoretechnologythebetterthemorewebsitesthebetterteacherisverydangerous﹣isindeed45heindicates. HoweverGumbrechtwarnsthattherearefewstudieseithersupportingorrejectingthehypothesis假设thattraditionalwaysofteachingare46toteachingviatheInternet.Hesaysthathecouldpointonlytohisfeelingtliatrealclassroompresenceshouldbe47andemphasizestheneedforeducatorstoexaminecriticallywheretechnology48ausefulteachingfunctionandwhereitdoesnot. YetGumbrechtallowsthatforcoursesinwhichknowledgetransmissionistheonlypurposeelectronicmediaprobablycandothejobwellenough.Indeedasaresultofthe20thcentury'sknowledge49andtheincreasingcostsofhighereducationusingtechnologyforthetransmissionofinformationisprobably50headmits.Howeverknowledgetransmissionshouldnotbethemostimportantfunctionoftheuniversityhemaintains51thatuniversitiesshouldbeplaceswherepeoplefaceopenquestionsplacesforintellectualcomplexityandriskfulthinking. Wearenotaboutfindingortransmittingsolutionswearenotaboutrecipeswearenotaboutmakingintellectuallifeeasy.Challengingcomplexityiswhat52yourmind.Itissomethinglikeintellectualgymnaistics.Andthisiswhatmakesyouasuitablememberofthesociety.Moreoverdiscussionsinthephysicalpresenceofotherscanleadtotheintellectual53.There'saan54changeandyoudon'tknowhowithappens.Discussionsinthephysicalpresencehavethecapacityofbeingthe催化別forsuchintellectualbreakthroughs.Thepossibilityofin﹣classroomteaching﹣﹣﹣oflettingsomethinghappenwhichcannothappenifyouteachbythetransmissionof'infonnationisits55 41.A.deny Bquestion Cobject Dcomment 42.A.combination Bcooperation Cpresentation Dinteraction 43.A.morethan Blessthan Cratherthan Dotherthan 44.A.blind Btough Cpassive Drough 45.A.impersonal Bdisastrous Cillogical Dimmoral 46.A.superior Brelated Copposed Dequal 47.A.approved Breformed Cmaintained Dremoved 48.A.serves Bconveys Cdelivers Didentifies 49.A.evaluation Bevolution Cemission Dexplosion 50.A.affordable Bflexible Cinevitable Dpredictable 51.A.confirming Burging Ccomplaining Dnoting 52.A.expands Blimits Ccomforts Dawakes 53.A.decline Binnovation Cconsequence Dformation 54.A.qualitative Birregular Cprotective Dminor 55.A.criticism Bstrength Cdemonstration Dinvolvement
如图所示并联电路中R0不变Rx增大时电路的总电阻R会选填“增大”“减小”或“不变”． 现有如下器材符合实验要求的电源已调零的电流表和电压表各一个开关一个阻值已知且不同的四个定值电阻R1R2R3和R4导线若干．请设计一个实验来验证上述结论．要求 1画出实验的电路图 2写出实验的步骤以及记录数据的表格．
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小乐利用光具座研究凸透镜成像的规律．当三个元件移动到图示位置时光屏中心出现了清晰的像．回答下列问题 1该凸透镜的焦距为cm． 2若在图示情况下小乐把蜡烛移到35cm刻度处凸透镜位置不变移动光屏后观察到的清晰像的性质应是写出像的正倒大小和虚实． 3若在图示情况下把蜡烛移到40cm刻度处凸透镜位置不变撤去光屏小乐直接用眼睛在原来放光屏处观察她能不能观察到清晰像为什么．
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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. 修改在错的词下画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. Euan'sGuideisadisabledaccessreviewwebsitewheredisabledpeoplecansharehisexperiencesinvariousplacesandratetheiraccessibility.AsawheelchairuserIamazedwhenIcameacrossEuan'sGuide.Ifoundthereviewssohelpfullywhendecidingwheretogoincludedmuseumshotelsandmore.IstartedaddingtomyownaccessreviewsonEuan'sGuide.Anditdoesn'ttakelongtowriteafirstreview.Thiskindofwritingcanbedoneeasywhileonthegoorathome.Eachreviewcoversparkingtoiletsstaffandanythingelseyouwanttoadd.Youcanalsoaddsomeofyourphoto.Everyonehasdifferentaccessrequirementsbutit'sgoodtogetreviewsfromdifferentangles.
Last'weekataconstructionsitenearAustinTexasworkersheardthecriesofapuppy小狗.Theywentaroundtheconstructionsitetryingtofigureoutwherethesecrieswerecomingfrom.Theyfiguredthepuppywastrappedsomewhere.Thentheyrealizeditwasactuallycomingfromthesky.Highabovetheirheadsapuppywasflyingthroughtheair﹣intheclawsofahawk鹰.Atthatverymomentthebirdsuddenlyletgoandthetinyscreamingpuppy﹣noolderthan6weeksold﹣felltothem. Asidefromafewminor.woundsonhisheadthepuppywassurprisinglyunhurt.TheworkersquicklybroughthimtoamedicalclinicandfromtherethepuppyfoundhiswayintothecareoftheAustinAnimalCenter.Wedon'tknowwherehecamefrom﹣whetherhewasbornasastray流浪狗orwhetherhewasinahomeandgotoutOlohancommunicationsdirectorfortheAustinAnimalCenterexplains. TheparatroopergotanewnamethatcamenaturallyHewouldbecalledTonyHawk.Consideringhistininess﹣notmuchbiggerthanamouse﹣TonyHawkprobablyseemedlikeagoodideatoahungryhawk.TonyHawk'sfearscalmeddownsoonafterhefoundhimselfonthegroundmostlybecausehefoundafosterhometoeasehimintohisnewlife.Inamonthorsohewillbelookingforaforeverhome. Olohanthinkshewon'twaitlong.We'vehadplentyofinteresttonsofapplicationsforhimshesays.He'scertainlynotgoingtohaveaproblemfindingahome.Soatinypuppywithoutapastfoundhimselffreefromtheclaws﹣thankstothewarmcaringhandsthatwillhelphimshapeabrandnewfuture. 1Whathappened.tothelittlepuppy? A.Hefellfromabuilding. B.Hewascaughtbyahawk. C.Hewastrappedsomewhere. D.Hewasseriouslywounded. 2Whatdidtheconstructionworkersdotohelpthepuppy? A.Theytookhimtomedicalcare. B.Theyfoundafosterhomeforhim. C.Theyprotectedhimfrombirdattack. D.Theygotsomeinformationabouthispast. 3Whatdidtheparatrooperinparagraph3? A.Astray. B.Amouse. C.Thehawk. D.Thepuppy. 4WhatcanweinferaboutTonyHawk? A.Heisveryfierce. B.Hewillbeadoptedsoon. C.Hehasadaptedtonewlife. D.Hefacesalotofproblems.
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HairLossAlopecia Informationaboutmalepatternbaldness秃顶causestriggersandtreatmentintheUK Incontrarylopopularbeliefhairloss﹣oralopecia﹣canstartatanyage.Whilstitisassociatedwithmaturemalesandstatisticsshowitdoesmainlyaffectmenabout40therealityisyoucannoticesymptomsinyour30soreven20sandteenyears.TheNHSstatisticsstatethat25%ofmenstartlosingtheirhairbythetimetheyreach30.Themostcommonformofhairlossismalepatternbaldness﹣alsoknownasandrogenicalopecia﹣thataffectsmorethanhalfofmenaroundtheworld. Oneoptionmanymenseekistreatmenttoavoidfurtherhairlossespeciallyearlyonintheprocess.WithtreatmentssuchasPropeciathatspecificallytargetmalepatternbaldnessitispossibletostophairlosscompletelyandevenencouragefreshnewhairgrowth. Whatisalopecia Alopeciaisthemedicaltermforhairloss.Mostcommonlyaffectingmaleshairlossinmeniscausedbyanincreasedsensitivitytothemalesexhormonesandrogens.Thetypeofalopeciayouhaveaswellashereditaryandexternalfactorscaninfluencelevelsofhairloss.Themostcommontypeofhairlossalopeciaismaleandfemalepatternbaldness.Othertypesinclude •Alopeciaareatapatchesofbaldnessusuallyonthescalp •Scarringalopeciahairlossdirectlyaffectingthehairfollicles •Telogeneffluviumhairthinningoveralargerareaonthetopoftheheadratherthanbaldpatches •Anageneffluviummostcommonlycausedbycancertreatmentssuchaschemotherapyandradiotherapy 60.WhichofthefollowingstatementsisFALSEaboutPropecia A.Itcanstophairlossalmostinallcases. B.Peoplecanbuyitonlinewithoutdoctorvisit. C.Itencouragesnewhairgrowthinrareeases. D.Itisespeciallyeffectiveonmalepatternbaldness. 61.Wecanlearnfromthepassagethatalopeciais. A.aninevitablepartofagingprocess B.morecommonamongmaturemales C.unnoticeablebefore40yearsold D.mostlyinfluencedbyexternalfactors 62.Thenextpartofthewebpageismostlikelytobeabout. A.hairlosscauses B.hairlosssymptoms C.preventinghairloss D.treatinghairloss.
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两支蜡烛用木棒相连接设法在其木棒中间插入一枚缝衣针把针的两端分别放在两个玻璃杯上将两端同时点燃发现蜡烛可以绕针轴上下来回摆动如图所示．关于此装置下列说法中正确的是
探究影响电磁铁磁性强弱的因素时按图示电路进行实验．逐渐增大电路中的电流进行多次实验每次都能观察到电磁铁甲吸引大头针的数目比乙多．此现象能够说明
下列溶液中的溶质常温下为气体的是
Theyblockentrancescrowdstreetcornersandtipontotheirsidesturningaconvenientformoftransportationintoasidewalkdangerthatisparticularlydangerousfortheelderlyanddisabled. NowanewCaliforniacompanyisworkingonapossiblesolutionforstoppingthechaoscausedbyelectricscooters滑板车incitiesaroundthecountry.ThecompanyknownasSwiftmilehasunattendedchargingstationsfore﹣scootersthataredesignedtoserveasaplacewhereriderscanparkthescootersbetweenrides.Thecompany'sfounderColinRochesaidthesola﹣poweredchargingstations﹣whichcanacommodateanybrandofe﹣scooter﹣aremostsuitableforareasthatareoftencrowdedwiththescooterssuchasbusandsubwaystations. Astheweatherwarmsandridershipincreasesthatstruggleisexpectedtointensify.Onone.sideofthedebateexpertssayarecitieswhoseleaderswanttoreducetrafficandencouragealternativeenvironmentally﹣friendlypatternsoftransportationtobattleagainstclimatechangeandpromoteinnovation创新.Somelocalofficialsalsofearthatrestrictingscootercompanieswillcastcitiesinanoutdatedlightdiscouragingtechnologycompaniesfromdoingbusinessthereinthefuture.Ontheothersideofthedebatearecriticswhohavecomplainedaboute﹣scootercompaniesforblockingwalkwaysandsellingaproductwhoseusehasledtothousandsofinjuriesamongridersandpedestriansmanyofthemsevere. PatBurtaformerPaloAltomayorwhoiscurrentlyadvisingSwiftmilesaidthefutureofe﹣scooterscoulddependheavilyonwhathappensin2019.Citieshaveidentifiedthebenefitsofe﹣scootersaswellasthe.drawbackswhichcouldbecomeexistentialforthecompanies.Ifthe.safetyandotherproblemsaren'taddressedIthinkcitieswillrestrictthemevenmorehesaid.Butthere'sagoodchancescooterswillbeadopteduniversallyiftheseproblemsgetsolved. 1Whatisthemainideaofthefirstparagraph? A.Theelderlyareeasytogetinjured. B.E﹣scootersaredifficulttofind. C.Manyproblemsarecausedbye﹣scooters. D.Newinventionsprovidepeoplewithconvenience. 2Whatcane﹣scooterownersdoatthechargingstation? A.Parktheire﹣scooters. B.Gettheire﹣scootersrepaired. C.Havetheire﹣scooterscleaned. D.Chargetheire﹣scootersforfree. 3Whatbenefitscane﹣scootersbringtothecities? A.Attractingmoretourists. B.Reducingtrafficpressure. C.Makingtheroadsmuchsafer. D.Increasingthelocalcompany'sprofits. 4Whatdecidesthefutureofe﹣scootersaccordingtoPatBurt? A.Thepublic'sattitude. B.Theimprovementoftraffic. C.Thesolvingofpresentproblems. D.Thebenefitsofthenewbusinessmodel.
InCCTV'sannualconsumer﹣protectionshowearlierthismonththeinternationalsportsweargiantNikewasaccusedoffalseadvertising.Commercials21promotetheHyperdunkbasketballshoesclaimedtheproductisequippedwithhigh﹣techaircushions.TheCCTVprogramhoweverrevealedthattheproductdidn'tcomewiihthefeature.Consumerswereapparentlymisled. ThisisinfactnotthefirsttimeNike22catchcheatingChineseconsumers.Backin2011consumerscomplainedthatthatyear'sHyperdunksneakersdidn'thavethe23adveniseaircushionsinthemeither.SuchwrongdoingsmightnotmarktheendofNike24arespectableandreliablebrandamongloyalshoppersbutNikeneedstorealizethat25onedayconsumers'trustinitvanishes消失sowillitssales.Bythenitwillbeimpossibleforthebrandtorestoreitsreputation. ChinaisanimportantbaseforNike26itaccountsforabouttenpercentofthecompany'smarket.OverthepastthreedecadesnumerousNBAgreatsfromMichaelJordantoLeBronJameshavebeenshownwearingNike'sgearprovingitsquality. Placingmisleadingadvenisementsonceagainhasdampenedsomeconsumer'strustinNike.FortunatelyNikeissuedatimelyapologylastweekofferinga4500﹣yuanrefund27isthreetimesthecostoftheshoes.Thesegestures showthatthecompanyhassomewhatrealizeditsmistakeandwantstore﹣establishconsumers'trustinit. Sportswearcompaniesoftenpushthetruthoftheirproductsbyhavingfamousathleteswearingthem.IfUsainBoltisseeninacommercial28dashwithNikeitmightbeimpliedthattheshoes29enableyoutorunfaster.Howevertherearelimitsto30canbesaidtopromoteaproduct.Withlyingcomesdistrustandwithdistrustcomescollapse.That'swhyNikeandanyothercompanyneedstobemorecarefulwithadvertisinginthefuture.
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小明查阅资料了解到出于安全考虑电梯都设置超载自动报警系统其工作原理如图甲所示电路由工作电路和控制电路组成在工作电路中当电梯没有超载时触点K与触点A接触闭合开关S电动机正常工作当电梯超载时触点K与触点B接触电铃发出报警铃声闭合开关S电动机不工作．在控制电路中已知电源电压U＝6V保护电阻R1＝100Ω电阻式压力传感器压敏电阻R2的阻值随压力F大小变化如图乙所示电梯底架自重和电磁铁线圈的阻值都忽略不计． 1在控制电路中当压敏电阻R2受到的压力F增大时其阻值减小从而使电磁铁的磁性填“增强”“减弱”或“不变”． 2某次电梯正常运行时测得通过的电磁铁线圈的电流为10mA此时电梯载重为多少 3若电磁铁线圈电流达到20mA时衔铁刚好被吸住电铃发出警报声．当该电梯厢内站立总质量为1000kg的乘客时试通过计算说明电梯是否超载g取10N/kg
下列属于复合肥的是
当前人工智能AIArtificialIntelligence技术正渐渐进入人们的生活像无人机家居机器人等．都是人工智能的初级应用一些高级人工智能应用如无人驾驶系统正在研发中．下列有关人工智能AI以及科学知识的描述合理的是
环境问题已被广泛关注．你认为下列措施中不利于保护环境的是
A.Youareonlyallowedtopuxchaseafirearmifyouhavehadabackgroundcheckandmeetcertainlegalrequirements. B.TherehavebeenmanyenlighteningarticlesonguncontrolinAmerica. C.IfyouweretovisittheUnitedStatesfortwomonthstheonlygunyoumightseeisinamuseumoronapoliceofficer. D.LessthanfiftypercentofhomesintheUnitedStatesownweaponsandmanyofthosehomesareinruralareaswheregunsmayhaveagreateruse. E.Morepeoplearedecidingtolegalizetheirguntransactionsinsteadofbuyingthemontheblackmarket. F.WhatalarmspeoplethemostaboutAmericangunculturearetheillegalgunsandshootingwhichmakesomeplacesfeelunsafe. GunshaveaspecialplaceinAmericancultureandthoughnoteveryoneagreesonwhetherornottheyareagoodthingthereisnomistakingthattheywillbepartoftheculturallandscapeforsometime.Toanswerthequestionnonoteveryonehasagun.67 Americansusegunsforoneoftwouseseitherforsportwheretheycanusethemonfiringrangesorforhuntinginapprovedareasorforself﹣protection.Thelatteriswheremostpeoplebegintotakesideseitherarguingfortheremovalofgunsfromsocietyorallowingmorepeopletohavethem.Thereareorganizationsandcommunitygroupsforbothsidesandbothsideshavestrongfeelings. Legallytherearerestrictionsongunowners.68Onlycertainkindsofweaponscanbepurchasedbythepublicandthatexcludesautomaticweaponandmilitarygradeweaponry.Gunownersmusttransporttheirweaponinasafewayunloadedandinmostcasesoutofsight.Specialconcealedcarrypermitsfromthepolicestationmustbeobtainedforpeoplewhowanttowearweaponandmostpeoplearerejectedforthiskindofpermit.69Criminalsstealgunsorbuythemillegallytocommitcrimesandthenewsisfullofterriblestoriesofwhathappenednext.Occasionallyachildwillgetaholdoflegalweaponandaccidentallyhurtthemselvesorothers. ItisimportanttorememberhoweverthatthenewsstoriesthatmaketheUnitedStatesseemlikeadangerousplacearedeceivinggunsarcnoteverywhereorconstant.70AfterallAmericaisasafeplacetolive.
图甲是一个豆浆机的实物图豆浆机的中间部位是一个电动机电动机通过金属杆带动其下部的刀片旋转从而将原料粉碎打浆刀片外部是一个环状加热管电热丝用来对豆浆加热该豆浆机的部分参数如表所示．制作豆浆的过程是加热和打浆交替进行图乙是该豆浆机做好一次豆浆的P﹣t图象．求 1加热管正常工作时电阻丝的阻值是多少 2在8～11分钟的时间内设豆浆质量为1.5kg比热恒为4×103J/kg•℃加热管产生的热量全被豆浆吸收到第11分钟时豆浆温度恰好为100℃则第8分钟时豆浆温度为多少 3豆浆机在粉碎打浆时电动机的内阻为40Ω则电动机输出的机械功率是多少
TheSecrettoSurvival In2006ateenagernamedBillwhowaslateforworkdrovethroughthecitysofastthatheknockedintomycar.Afterthe1Ispentthenextmonthinhospital.The2wasabout$130000.Totopitoffdoctors3itwouldtakeanentireyearformetorestoretohealth. Itseemedasifitwasn't4thatIwasalreadydealingwithpoverty贫困andmusculardystrophy肌肉萎缩症.Solifedecidedtopileonalittle5justtoseehowmuchIcould6.Atthattimemylifeseemedtotally7. How8wouldithavebeento9desperation?Orangeragainstthe10?ButIdidn't.InsteadI11myselftosayOkaythisismylifenow.What'snext?AfterallIcouldn't12whathadhappened.TheonlythingIhadcontroloverwashowI13tothatchange.Andthefirstandmost14responsewastotalandcomplete15.Alotofpeopleviewitas16.Theythinkthatiftheyacceptwhat'shappenedtothemthey'llbe17defeat.Butit'stheopposite.It'sonlyby18realitythatyoucancreateaplantochangethatreality.Acceptanceisthefirststeptoyour19. 20Ifoundwaystocoverthemedicalexpenses.MeanwhileitonlytookmesixmonthstorecoverinsteadofayearasdoctorspredictedandIrestartedmylifeevenhealthier. 1A.accident B.meeting C.coincidence D.treatment 2A.car B.bill C.reward D.fine 3A.predicted B.promised C.argued. D.permitted 4A.fair B.ordinary C.special D.enough 5A.work B.regret C.comfort D.extra 6A.lose B.earn C.take D.pay 7A.hopeless B.lonely C.pointless D.busy 8A.lucky B.easy C.unusual D.wonderful 9A.getridof B.sinkinto C.smell D.face 10A.discrimination B.punishment C.misfortune D.abuse 11A.allowed B.forced. C.forbade D.expected 12A.change B.explain C.plan D.announce 13A.responded B.linked C.contributed D.submitted 14A.desired B.natural C.vital D.aggressive 15A.resistance B.acceptance C.agreement D.commitment 16A.virtue B.courage C.weakness D.challenge 17A.valuing B.avoiding C.foreseeing D.admitting 18A.escaping B.representing C.ignoring D.acknowledging 19A.world B.health C.victory D.independence 20A.Eventually B.Generally C.Exactly D.Normally
下列实验操作不正确的是
下列常见的生活物品所含的主要材料属于有机合成材料的是
下列有关说法正确的是
电动机是一种使用广泛地动力机械．从能量转化的角度看它主要是把电能转化为机械能还有一部分能量在线圈中以热量的形式散失掉． 1安装完毕闭合开关后发现电动机的转动方向与要求的相反他们怎样做才能达到要求 2如果某电动机线圈的电阻为R电动机工作时两端的电压为U通过电动机的电流为I请推导此电动机电能转化为机械能的效率． 3改进实验后使电动机转轴转动移动滑动滑片记下电压表和电流表的示数数据记录如下如在正常工作时转子突然被卡住此时电动机的发热功率多大
下列变化中属于物理变化的是
无论有多么不满我父母都不会在我的朋友面前使我感到难堪.Nomatter.
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