首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
艾滋病是21世纪人类健康的瘟疫，了解艾滋病及预防知识是公民应具备的生物学常识．如图是HIV侵染宿主细胞及在宿主细胞内增殖的过程．回答问题： （1）艾滋病的主要传播途径是： ． （2）从免疫学...
查看本题答案
包含此试题的试卷
高三下学期生物《》真题及答案
点击查看
你可能感兴趣的试题
艾滋病被称为20世纪的瘟疫艾滋病病毒把人体内的作为攻击目标
红细胞
血红蛋白
淋巴细胞
神经系统
艾滋病被称为20世纪的瘟疫艾滋病病毒主要攻击目标是人体的
红细胞
血红蛋白
淋巴细胞
神经系统
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
艾滋病成为二十一世纪对人类健康威胁最大的传染病之一因此了解艾滋病的相关知识以及如何与艾滋病患者相处是
自1981首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病病
自1981年首例艾滋病在美国发现以来全球已有200多个国家和地区受到艾滋病的严重威胁2002年我国艾
自1981年首例艾滋病在美国发现以来全球已有200多个国家和地区受到艾滋病的严重威胁2002年我国艾
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁.目前我国艾滋
为了预防控制艾滋病的发生与流行保障人体健康和公共卫生2006年1月国务院颁布艾滋病防治条例加大政府对
①②③
②③④
①③④
①②④
21世纪人类三大威胁不包括
艾滋病
癌症
缺水
缺粮
被称为21世纪的政治瘟疫的是
xié jiāo 的活动
__主义
毒品贩卖走私
艾滋病的蔓延
艾滋病被称为20世纪的瘟疫艾滋病病毒将人体内的作为攻击目标
红细胞
血红蛋白
淋巴细胞
神经系统
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
自1981年首例艾滋病在美国被发现以来全球已有200多个国家和地区受到艾滋病的严重威胁目前我国艾滋病
要预防艾滋病应该做到的是
了解艾滋病的知识
远离可能感染艾滋病的人
理解和接纳艾滋病感染者
拒绝毒品和滥交
自1981年首例艾滋病AIDS在美国被发现以来全球都受到艾滋病的严重威胁估计到2010年我国艾滋病病
①②③④⑤
①②④⑤
③④⑤⑥
①③⑤⑥
热门试题
更多
goodadvicetheteachergaveme! A.How B.What C.Whata D.Howa
一年四季风采各异．下列现象中表明分子在永不停息地运动的是
一人站在电梯上随电梯一起匀速上升如图所示画出人的受力示意图．
BeforeweleftLiYanpingexplainedtomethattheforceofgravitywouldchangethreetimesonourjourneyand1thefirstchangewouldbethemostpowerful.Thenwewereoff.Astherocketroseintotheairwe2pullbackintoourseatsbecauseweweretryingtoescapethepulloftheearth'sgravity.Itwasso3strengththatwecouldnotsayanythingtoeachother.GraduallytheweightlessenedandIwasabletotalkto4he.Whyisthespaceshipnotfallingbacktotheearth?OntheearthifIfallfrom5treeIwillfalltotheground.Iasked.Wearetoofar6theearthnowtofeelitspullhe7explainsowefeelasifnogravityatall.Whenweget8closetothemoonlittlebylittleweshallfeelitsgravitypullingusbutitwillnotbeaspowerfulapullastheearth's.Icheeredupimmediatelyandfloated9weightlessaroundinourspaceshipcabin10watchtheearthbecomesmallerandthemoonlarger.
Imusthavelookeddeepinthoughtorasdeepinthoughtasan11﹣year﹣oldmancanwhenmygrandmotherglancedupfromherweedingtoaskYouhavesomethingonyourminddon'tyou? YesIwasthinkingthatsomedayIwanttobeanOlympicspeedskatingchampionlikemyheroEricHeidenIwanttobeadoctorlikemyparentsandIwanttohelpchildreninAfrica. IimmediatelyknewIhadconfidedintherightpersonwhenaknowingsmilebrokeacrossherface.Johannofcourse!Youcandoanythingyouwanttodo!shesaidsimply.Andwithmygrandmother'ssupportIsetouttopursuemypassions. 14yearslaterIwaswellreadytotakeholdofmyfirstdreambecominganOlympicchampion.TheOlympicsin1994wereinmyhomecountryNorway.AsIenteredtheOlympicstadiumIwasn'tthebestathleteandmanyhaddoubtsaboutmyabilitytoperformwell.ButIhadsomethingspecialworkingforme.IhadawomaninthefirstrowwhobelievedinmefollowingmypassionsjustasmuchasIdid.Forthefirsttimeevermygrandmotherwasgoingtoseemeskate. Ithappened.BreakingaworldrecordIwonthegold. AsIstoodonthepodium领奖台thatIhaddreamedaboutmyentirelifeacuriousquestionpoppedintomyhead.Whyme?WhydidIwingivenalltheotherincrediblecompetitorsoutthere?Thereasonhadtobemorethanagrandmotherwhosharedabeliefinhergrandson'sdream.ThequestionledmetoonlyoneanswerbecauseIwantedtomakeadifferenceintheworldandwithallthemediaattentiononmysuccessIcould. IimmediatelyknewwhatthatdifferencehadtobehopeinthelivesofthechildreninAfrica.SixmonthsearlierI'dbeeninvitedtoEritreaasanambassadorforOlympicAid. 1Whentheauthorspokeoutwhatwasonhismindhisgrandmother. A.laughedathim B.supportedhim C.hadnoconfidenceinhim D.feltquitesurprised 2Theauthorprobablyrealizedhisfirstdreamattheageof. A.20 B.22 C.25 D.28 3Whatwilltheauthortellusinthepartfollowingthepassage? A.HiseffortsinhelpingtheAfricanchildren. B.HishardtraininginpreparingforthenextOlympics. C.HissuccessesatotherOlympicgames. D.Hisgrandmother'sattitudetowardshim. 4Thewholepassageismainlyabout. A.ayoungboywhohadmanydreams B.theencouragementfromagrandmother C.asportsmanwhorealizedhisfirstdreamofhelpingAfricanchildren D.anOlympicherowhomadeadifferenceintheworld
﹣﹣﹣There'refourbedroomsinthehousewithitsownshower. ﹣﹣﹣That'swhatIwant.I'vegotafewkids. A.either B.neither C.each D.none
We'resurroundedbychemistryineverydaylife.Sometimesitiseasytoseelikewhenyourscienceteacherconductsabigexperimentinclass.Atothertimesitcanbeextremelyhardtoseeeverydaychemistryatworkbutnearlyeverythingyoutouchorusehassomeelementofchemistryinit. Somethingassimpleastoothpastecontainsatleastthreechemicalsifnotmore.Itisthemixtureofthemanditschemicalreactionthatkeepsyourteethclean.Otherthingsyouuseeverydayarecreatedbychemistrysuchashairproductsshampooandsoap.Addingdetergent洗涤剂towaterinvolveschemistry.Withoutchemistrywewouldneverhaverealizedthatweneedsoaptogettheoiloutofclothesorskin. Chemistrynotonlyhelpsusmakeproductsforusebutitalsohelpsusunderstandtheworldaroundus.Chemistryhelpsusunderstandwhattheozonelayer臭氧层isandhowitprotectsus.Chemistryalsogivesussunscreentoprotectusfromthesun.Thankstochemistryweknowbleach漂白剂can'tbemixedwithvinegarbecauseitcanproducepoisonousgas.Withoutchemistrywewouldn'thavehadfireworksdisplaysonimportantdaysliketheSpringFestival. Chemistryplaysabigroleinfoodpreparation.Cookingfoodcausesittogothroughachemicalchange.Thatiswhycookedfoodoftentastesdifferentfromraw生的food.Bakingisagreatexampleofchemistry.Toomuchortoolittleofanyingredientmakesadifferencetotheresultofbakingforexamplethedough面团won'triseorthecakewillbeflat. Chemistryisn'tsomethingthatjustlivesinalabit'ssomethingthatyoucomeacrosshundredsoftimeseveryday.Ifyouknowhowchemistryworksyouwillgetagreatercomprehensionofthesciencebehindsomeofthesimplestlookingthings. 1What'sthemainideaofParagraph1? A.Chemistryiseasytoseearoundus. B.Sometimeschemistryishardtoseearoundus. C.Ascienceteacheroftendoesabigexperiment. D.Fewthingsineverydaylifecontainchemistry. 2ThefollowingactionsareaboutchemistryEXCEPT. A.cleaningteethwithtoothpaste B.washinghairwithhairproducts C.usingsoaptoremovetheoilfromclothes D.washingyourfacewithwater 3TheunderlinedwordpoisonousinParagraph3means. A.harmful B.healthy C.fresh D.pleasant 4WhichoneisTRUEaccordingtoParagraph4? A.Onecan'tfindchemistrywhencookingfood. B.Chemistryplaysanimportantpartinfoodmaking. C.Thatdoughrisesisnothingtodowithchemistry. D.Aflatcakeistheresultoftoomanyingredients
Paynoattentiontothosewholaughatyou.Whatmostishowyouseeyourself. A.matters B.minds C.cares D.counts
电磁炉在使用过程中为避免因温度过高而烧坏线圈其用来加热的电磁发热体R工作时起降温作用的风扇也开始工作电磁发热体停止工作后风扇还会继续工作一段时间才停止工作下列各图中符合该电路设计要求的是
小明用煤气灶烧水时进行了如下思考正确的是
Themoreyousmiletheyouwillfeel. A.happily B.morehappily C.happy D.happier
如图是“研究物体的动能跟哪些因素有关”的实验装置．请你完成下列内容． 1该实验装置中所探究物体的动能是指物体选填“A”或“B”的动能． 2若让同一钢球A分别从斜槽不同的高度由静止滚下高度h越高钢球运动到水平面时速度越木块B被撞得越远这说明物体的动能与物体的有关． 3若让不同质量的钢球从斜槽同一高度由静止滚下速度相同时质量越的钢球将木块B撞得越远这说明物体的动能与物体的有关． 4若斜槽光滑小球从斜槽顶端由静止滚到斜槽底部的过程中其机械能选填“变大”“不变”或“变小”．
Whydowedream?It'saquestionresearchershavebeenstudyingforyears.Nownewresearchsuggeststhatsomedreamsmayresultfromthebrain'sefforttokeeplearningevenaswesleep. InastudyinBoston100volunteersweretrainedforanhouronamaze迷宫.Theytriedtofindtheirwaythroughthedifficultpuzzleasquicklyaspossible.Thenhalfofthevolunteerswereallowedtosleepfor90minutes.Theotherhalfstayedawakereadingorrelaxing.Theoneswhosleptwereaskedtodescribetheirdreamswhentheywokeup. Aftertherestthevolunteerswereaskedagaintosolvethemaze.Thosewhohadn'tsleptshowednoimprovementordidevenworseafterthebreak.Sleeperswhodidn'treportanymazerelateddreamsdidbetterbutshowedonlyalittleimprovement.Howeverfournaptakerswhoreporteddreamingaboutthemazeshowedasurprisingimprovement.Theyscored10timeshigheraftersleepinganddreamingaboutthemaze. Eventhoughthenumberofdreamerswassmalltheresearchersnotedthatthegapinlearningbetweenthedreamersandnondreamerswassowidethatthefindingwassignificant有意义的. Thedreamershadallperformedpoorlyonthetestbeforedreamingaboutit.Thatsuggeststhatstrugglingwithataskmightbethetriggerthatleadsthesleepingbraintofocusonitandworkonhowtodealwithit. It'salmostasifyourbrainisgoingthrougheverythingthathappenedtodayDrStickgoldascientistatHarvardMedicalSchoolsaid.Thethingsyou'reobsessed迷住witharetheonesthatyourbrainforcesyoutocontinuetodowith. 1Whatwerethevolunteersaskedtodoaftertherest? A.Toworkonanewmaze. B.Tocontinuetodothemaze. C.Totalkwitheachotherabouttheirdreams. D.Totellwhattheythoughtaboutthemaze. 2Accordingtothestudywhichgroupshowedthegreatestimprovement? A.Thosewhodidn'tsleep. B.Thosewhosleptbutdidn'tdream. C.Thosewhodreamedaboutthemazewhilesleeping. D.Thosewhothoughtaboutthemazebeforefallingasleep. 3TheunderlinedwordtriggerinParagraph5probablymeans. A.chance B.cause C.way D.idea 4What'sthebesttitleforthispassage? A.LearningWhileYouDream B.WhatDreamsStandfor C.DreamaGoodDream D.DreamsandHealth
生活中蕴含着很多物理知识 1简易调光台灯可用电位器连续调节亮度电位器是通过改变接入电路中电阻线的来实现的 2为防止伤害电影道具中的“石块”用泡沫塑料制成这是因为泡沫塑料密度 3没有金刚钻不揽瓷器活说明金刚钻的大 4如图所示当手机扫描二维码时摄像头相当于透镜当光照射到二维码的白色部分时光被填“反射”或“吸收”再经过摄像头折射而成像填“虚”或“实”手机再通过解码就可以获取相关信息．
﹣ExcusemeJohnbutwhichisforme? ﹣Youcantakehalf.Theyareexactlythesame. A.either B.both C.any D.neither
为了安全用电在家庭电路设计安装中使用漏电保护器．漏电保护器是在用电器发生漏电或人体触电时实施保护的装置．家庭电路漏电时通过火线和零线的电流不相等如图中虚线框内AB两点电流不相等漏电保护器中有一特殊装置在图中虚线框内未画出检测到该差异后会自动切断电源起保护作用．下图是模拟漏电的试验电路由一只开关S和电阻R组成闭合开关S能模拟漏电情形的连接电路是
假如你叫李华你和你的家人去笔友David所在的城市新加坡Singapore旅游受到David的热情款待回来后你想对他表达自己的感谢之情.请根据以下要点给David写一封信. 1.感谢他的热情款待 2.在新加坡玩得很开心 3.新加坡的风景和美食令人印象深刻 4.邀请他来遵义旅游. 注意1.词数100词左右2.可适当增加细节以使行文连贯. DearDavid Yours LiHua
Myfamilyoftenhadaget﹣togetherwithfriendsinmychildhood.AsIwassmarttherewasalwayssomeonewhowouldcomeuptomentionmyhigh1andaskWhatareyougoingtodowhenyou2? Wellitstartedoutbeingateacherorahero.3itwasafiremananartist…AsIgrewoldermydreamsofthefuture4.WhenIwasgoingtocollegeIwasaskedWhatwillyoumajorin?anotherquestion5tofindoutwhatIwouldbewhenIgrewup. BythenImadeupmymindtobecomea6programmer.SoIwasstudyingsoftwareformuchofmylife.Iam7thatIcouldrealizemydream.Therealizationofmylifepurposeencouragesmetohelpotherstosucceedintheirown8. Howeverformanythereisa9whichgoesaroundstealingourdreamsandrobbingusofthe10mentalstatetoachieveour11.Sometimesthethiefwillcomeasaparentarelativeorafriend12thegreatestthiefisjustourselves. Usuallywhenweareaboutto13theaimasmallvoiceinsidewillsayYouwillnever14.Veryfewhaveeverdonethissuccessfully.Andonandonthesmallvoicemakesus15heartandfail. Failure16helpsourdreamstocometrue.Itisoneofthemostimportant17wehavebecauseitteachesus18lessons.Andwhenwelearntheselessonswellweare19forsuccess. Therearenoovernightsuccessesbutwithperseverance毅力theywillcome.Sojustdon't20.Letdreamsstayinyourlife. 1A.intelligence B.power C.quality D.character 2A.getup B.pickup C.growup D.setup 3A.Later B.Before C.Recently D.Meanwhile 4A.kept B.changed C.formed D.continued 5A.imagined B.designed C.supposed D.answered 6A.car B.radio C.computer D.satellite 7A.surprised B.happy C.interested D.worried 8A.studies B.work C.lives D.experience 9A.thief B.parent C.friend D.relative 10A.same B.only C.necessary D.exact 11A.results B.advantages C.power D.goals 12A.so B.because C.and D.but 13A.reach B.select C.leave D.remove 14A.fail B.succeed C.arrive D.forget 15A.break B.lose C.give D.take 16A.though B.instead C.besides D.otherwise 17A.purposes B.tools C.messages D.medicines 18A.logical B.hopeless C.thankful D.valuable 19A.responsible B.sorry C.angry D.ready 20A.takeapart B.giveup C.bringback D.setoff
在木棒的一端缠绕一些铜丝制成两个完全相同的简易密度计现将它们分别放入盛有不同液体的两个烧杯中如图所示当它们竖直静止在液体中时液面高度相同．从观察到的现象可以判断两个简易密度计所受浮力F甲F乙两杯液体的密度ρ甲ρ乙两个烧杯底部所受液体的压强p甲p乙选填”大于”“小于”或”等于“
能源问题是现代社会发展的三大基本问题之一．能源家族中①煤炭②地热能③石油④天燃气⑤水能⑥风能等属于不可再生的是不是直接或间接来自于太阳的是填序号．电能可以使电灯发光同时产生内能散失在空气中但这些内能却无法自动转化为电能该现象说明能量转化具有性．
小浩同学用天平量筒和水等器材测量小石块密度的实验中 1图甲是小浩在调节天平时的情景小丽指出了他在操作上的错误你认为错误之处是． 2小浩纠正了错误后调节好天平将石块放入左盘天平平衡时测出石块的质量如图乙所示小石块质量是g． 3如图丙所示量筒测出小石块的体积是cm3则小石块的密度是g/cm3． 4小丽同学做这个实验时没有用天平也测出了该石块的密度．她先按照小浩的方法测出石块的体积然后用体积为48cm3质量为12g的小泡沫块不吸水与小石块用细线捆在一起再次放入量筒中石块和泡沫块漂浮在水面上且有1/3的泡沫露出水面．石块和泡沫块放入量筒之前水面初始位置是28ml则石块和泡沫块放入量筒后水面应该在ml刻度处．小丽测出的石块密度应为g/cm3．
下列与物态变化有关的现象说法正确的是
学校走廊贴有“轻声慢步”的提示语这里的“轻声”指的是声音特征中的
FourHabitstoHelpYouSucceed Weallwanttosucceed.Forthosewhohavetriedandfailedsuccessseemsdifficulttounderstand.1. •Knowyourvalues. Findingyourvaluesisinlinewithcreatingmotivation.2Pickahandfulofthingsandwritethemdown.Remindyourselfofyourvalueseverydayandreflectonwhetheryouarehonoringthosevaluesthroughyourwork. •Pickagoalandfocusonit. Chooseonegoaltostartsomethinglargeenoughthatwillgiveyouasenseofachievementwhileadjustingwelltoyourvalues.Focusiskeyhere.3Ifyouperformmanytasksatatimeyoumightneverfinishyourprojectsbecausetheywilltakefartoolong. •Setatimeforsuccess. Setadateforsuccess.Knowwhenyouhopetorealizeyourgoal.4Bysettingatimelimityouaremakingtheprocessrealistic. •5. Failurecan'tbeavoidedwhenyoutakerisks.Byitsverydefinitionthedesiretosucceedmeansyouareriskingfailure.Manypeopletendtogiveupfartooearly.Don'tfallintothistrap!Usefailure.Treatitasagoodthingandgoon. A.Themorefocusedyouareononegoalthehigherchanceyouhaveofsuccess. B.Maketherightdecision. C.Ihavemadealistoffourhabitstohelpyousetgoalsandrealizethem. D.Don'tgiveupbecauseoffailure. E.Keepitrealisticwhilenotgivingyoutoomuchtime. F.Sitandreflectonwhatyouvaluemost. G.Pushyourselftobecourageousandtakethatnextstep.
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. 增加把缺词处加个漏字符号∧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. Todaythenumberofthenetizens网民inourcountryhaveincreasedrapidlyyetmanyofthemdonotpayenoughattentiontothefamily.ItisnodoubtthatwebenefitmuchfromtheInternet.Foranexampleit'sconvenientforustogettheinformationsweneedandcommunicatewithourfriendsandrelatives.Meanwhileitcouldhelpuslearnthatishappeningbothathomeandabroad.ThereforenomatterhowattractivetheInternetisweshouldn'tseparatedfromourlovedones.WeshouldstopsurftheInternetandspendtimewithourfamiliesenjoyingthetimewhenyouaretogether.
如图是用动滑轮提升货物A的示意图．在竖直向上的拉力F的作用下使重400N的货物A在50s的时间里匀速竖直上升了10m．在这个过程中拉力F为250N不计绳重及摩擦．求 1动滑轮重G动2动滑轮的机械效率η3拉力F的功率P．
TomarrivedatthebusstationquiteearlyfortheLondonbus.ThebusforLondonwouldnotleaveuntilfivetotwelve.Hesawalotofpeoplewaitinginthestation.Somewerestandinginlinesandotherswerewalkingabout.Therewasagroupofschoolgirls.Theirteacherwascryingtokeeptheminorder.Tomlookedaroundbuttherewasnowhereforhimtosit. Hewalkedintothestationcafé.Helookedupattheclockthere.Itwasonlytwentytotwelve.Hefoundaseatandsatdownfacingalargemirroronthewall.JustthenJohnoneofTom'sfriendscameinandsatwithTom. Whattimeisyourbus?askedJohn. OhthereisplentyoftimeyetansweredTom. OhI'llgetyousomemoreteathensaidJohn. Theytalkedwhiledrinking.ThenTomlookedattheclockagain. Goodheavens!It'sgoingback﹣ward!hecried.Afewminutesagoitwastwentytotwelveandnowit'shalfpasteleven. YouarelookingattheclockinthemirrorsaidJohn. Tomwantedtokickhimselfforbeingsofoolish.Thenextbuswasnottoleaveforanotherhour.Hehasneverlikemirrorsincethen. 1TheLondonbusleft. A.at1155 B.at512 C.before1155 D.after1155 2Tomwentintothestationcafébecause. A.Johnaskedhimtohaveacupoftea B.hewantedadrinkthere C.hewouldmeetafriendofhis D.itwasearlyyetandhewantedtofindaplacetosit 3Whattimewasitinfactwhenhelookedattheclockinthemirror? A.Halfpasttwelve. B.Halfpasteleven. C.Twentytotwelve. D.Halfpastone. 4Whichofthefollowingistrue? A.Tommissedhisbus B.Hehaslikemirrorsincethen. C.Thenextbuswouldleavesoon. D.TomarrivedLondonontime.
小明在老师的指导下用小球和弹簧等器材进行了如下实验与探究不考虑空气阻力让小球从某高度处由静止开始下落到竖直放置的轻弹簧上如图甲在刚接触轻弹簧的瞬间如图乙小球速度为5.0m/s．从小球接触弹簧到将弹簧压缩至最短如图丙的整个过程中得到小球的速度v和弹簧缩短的长度△x之间的关系如图丁所示其中A为曲线的最高点已知该轻弹簧每受到0.1N的压力就缩短0.5cm并且轻弹簧在全过程中始终发生弹性形变． 1从小球接触弹簧到将弹簧压缩至最短的过程中小球速度的变化情况是 2当小球的速度为5.0m/s时弹簧产生的弹力F与小球的重力G的关系为FG大于/小于/等于当弹簧的压缩量最大时小球处于平衡/非平衡态． 3实验中所用小球的质量为kg全过程中弹簧中弹力的最大值为N．
如图是珠海航空展飞行表演时的情景以为参照物飞机是运动的飞机向后喷气却能向前飞行这是因为歼20战机飞行速度最大可达850m/s则30min内歼20最大飞行距离可达km．
如图所示是某家用电器的内部电路图其中R1和R2为加热电阻1234分别为四个接线柱．若要让两电阻串联接入电路则将接线柱与接线柱3连接此电路中不能将接线柱与接线柱3相连否则造成短路．电功率最大的连接方法是将接线柱1和3连接同时将接线柱连接起来．
热门题库
更多
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
国际法
教案备课库
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号