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设A,B,C,D是半径为2的球面上的四点,且满足AB⊥AC,AD⊥AC,AB⊥AD,则三个三角形的面积之和S△ABC+S△ABD+S△ACD的最大值是( )
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高三下学期数学《》真题及答案
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半径为4的球面上有
B.C.D.四个点,且满足
,
,则
的最大值为 A. 64
32
16
8
球面上三点A.B.C.AB=18BC=24AC=30球心到平面ABC的距离为球半径的一半则球半径为_
已知半径为4的球面上有两点AB球心为O若球面上的动点C满足二面角C﹣AB﹣O的大小为60o则四面体
若地球半径为R.地面上两点A.B.的纬度均为北纬45°又A.B.两点的球面距离为则A.B.两点的经度
连接球面上两点的线段称为球的弦半径为4的球的两条弦ABCD的长度分别等于点MN分别为ABCD的中点每
1
2
3
4
在半径为4的球面上有不同的四点ABCD若AB=AC=AD=4则平面BCD被球所截得图形的面积为.
已知A.B.C.三点在球心为O.半径为R.的球面上AC⊥BC且AB=R那么A.B.两点间的球面距离为
宇宙深处有一颗美丽的行星这个行星是一个半径为rr>0的球人们在行星表面建立了与地球表面同样的经纬度系
已知在半径为2的球面上有
,
,
,
四点,若AB=CD=2,则四面体ABCD的体积的取值范围是( )
过球面上三点
B.C.的截面和球心的距离是球半径的一半,且AB=6,BC=8, AC=10,则球的表面积是 ( ) A.
如图O.是半径为1的球的球心点A.B.C.在球面上OAOBOC两两垂直EF.分别为大圆弧AB与AC的
已知球O.的半径为1A.B.C.三点都在球面上且每两点间的球面距离均为则球心O.到平面ABC的距离为
已知过球面上三点A.B.C.的截面到球心的距离等于球半径的一半且AC=BC=6AB=4则球的半径等于
已知△ABC的三个顶点在同一球面上若∠BAC=90°AB=AC=2球心O.到平面ABC的距离为1则该
已知ABC是球O的球面上三点且为该球面上的动点球心O到平面ABC的距离为球半径的一半则三棱锥体积的最
设ABCD是球面上的四点线段ABACAD两两互相垂直且AB=5AC=4AD=则该球的表面积为
36π
64π
100π
144π
已知过球面上三点ABC的截面到球心距离等于球半径的一半且AC=BC=6AB=4则球面面积为
@B.C的截面到球心距离等于球半径的一半,且AC=BC=6,AB=4,则球面面积为( )
A.42π B.48π
54π
60π
设ABCD是球面上的四个点且在同一平面内AB=BC=CD=DA=3球心到该平面的距离是球半径的一半
@B.
D是球面上的四个点,且在同一平面内,AB=BC=CD=DA=3,球心到该平面的距离是球半径的一半,则球的体积是( )
A.
B.
C.
已知球面面积为16πA.B.C.为球面上三点且AB=2BC=1AC=则球心到平面ABC的距离为___
如图O.是半径为l的球心点
B.C.在球面上,OA.O
OC两两垂直,E.F.分别是大圆弧AB与AC的中点,则点E.F.在该球面上的球面距离是
A.
B.
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某研究小组切取某种植物胚芽鞘的顶端分成甲乙两组按下图所示的方法用琼脂块收集生长素再将含有生长素的琼脂块置于去顶胚芽鞘切段的一侧一段时间后测量胚芽鞘切段的弯曲程度α角测得数据如下表据此回答问题. 1生长素在胚芽鞘中的运输属于极性运输这种运输的方向是. 2上图中α角形成的原因是. 3据表可知乙组中左右两侧的琼脂块所引起的α角基本相同但小于甲琼脂块所引起的α角原因是.
某种植物的羽裂叶和全缘叶是一对相对性状.某同学用全缘叶植株植株甲进行了下列四个实验. ①让植株甲进行自花传粉子代出现性状分离 ②用植株甲给另一全缘叶植株授粉子代均为全缘叶 ③用植株甲给羽裂叶植株授粉子代中全缘叶与羽裂叶的比例为11 ④用植株甲给另一全缘叶植株授粉子代中全缘叶与羽裂叶的比例为31 其中能够判定植株甲为杂合子的实验是
Nooneknowsexactlyhowtheearthbegan.AccordingtoawidelyacceptedtheorytheearthwasjustacloudofdustaftertheBigBang.Thenthedustsettledintoasolidglobewhichexplodedviolentlywithfireandrockandproducedwatervaporandmanygasesmakingtheearth'satmosphere.1Whatisevenmoreimportantisthatastheearthcooleddownwaterappearedandstayedonthesurface.Itwasthe2presencepresentofwaterthatallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.Thisproducedachainreaction3whichmadeitpossibleforlifetodevelop.Firsttheappearanceofsmallplantsencouragedthedevelopmentofearlyshellfishandallsortsoffish.Nextgreenplantsbegantogrowonland.They4werefollowedfollowbylandanimals.Somewereinsects.Otherscalledamphibians5werebeabletoliveonlandaswellasinthewater.Soreptilesappearedforthefirsttime.Theyproducedyounggenerallyby6layinglayeggs.Laterdinosaursdeveloped.7Unluckilylucktheysuddenlydisappeared.Afterthatmammalscameintobeingandexistedontheearth.Theseanimalsweredifferentfromalllifeformsinthepastbecausetheygavebirth8toyoungbabyanimalsandproducedmilktofeedthem.Finallyhumansbecomethemostimportantanimalsontheplanet.However9theyareputtingtoomuchcarbondioxideintotheatmospherewhichpreventsheat10escapingescapefromtheearthintospacemakingtheearthtoohottoliveon.Asaresultofthiswhetherlifewillcontinueontheearthwilldependonwhetherthisproblemcanbesolved.
Thedamagethatagingdoestoabodyextendsallthewaydowntothecellularlevel.Butthedamageincreasedbycellsinoldermusclesisespeciallyseverebecausethecellsdonotreproduceeasilyandtheybecomeweakerastheirmitochondria线粒体whichproduceenergyreduceinenergyandnumber.Astudyhoweversuggeststhatcertainsortsofexercisemayremovesomeofwhattimecandotoourmitochondria. Exerciseisgoodforpeopleaseveryoneknows.Butscientistshavesurprisinglylittleunderstandingofitscellularimpactsandhowthosemightvarybyactivityandtheageoftheexerciser.Soresearchersrecentlyconductedanexperimentonthecellsof72healthybutsedentary久坐的menandwomenwhowere30oryoungerorolderthan64.Afterbaselinemeasureswereestablishedfortheiraerobic有氧的fitnesstheirblood﹣sugarlevelsandthegeneactivityandmitochondrialhealthintheirmusclecellsthevolunteerswererandomlyassignedtoaparticularexerciseprogram. Someofthemdidintense强烈的weighttrainingseveraltimesaweeksomedidbriefintervaltrainingthreetimesaweekonexercisebicyclessomerodeexercisebikesatanappropriatepacefor30minutesafewtimesaweekandliftedweightslightlyonotherdays.Afourthgroupthecontrol对照组didnotexercise.After12weeksthelabtestswererepeated.Ingeneraleveryoneexperiencedimprovementsinfitnessandanabilitytoregulatebloodsugar. Butmoreunexpectedresultswerefoundinthebiopsied活组织检查musclecells.Amongtheyoungersubjectswhowentthroughintervaltrainingtheactivitylevelshadchangedin274genescomparedwith170genesforthosewhoexercisedmoreappropriatelyand74fortheweightlifters.Amongtheoldergroupalmost400geneswereworkingdifferentlynowcomparedwith33fortheweightliftersandonly19fortheappropriateexercisers. Manyoftheseaffectedgenesespeciallyinthecellsoftheintervaltrainersarebelievedtoinfluencetheabilityofmitochondriatoproduceenergyformusclecellsthesubjectswhodidtheintervalexerciseshowedanincreaseinthenumberandhealthoftheirmitochondria﹣animpactthatwasparticularlypronouncedamongtheoldercyclists.ItseemsexercisecouldhelpcontainthedeclineinthecellularhealthofmusclesassociatedwithagingespeciallyifitwasintensesaysDr.SreekumaranNairthestudy'sseniorauthor.Infactolderpeople'scellsrespondedinsomewaysmorestronglytointenseexercisethanthecellsoftheyoungdid﹣suggestinghesaysthatitisnevertoolatetobenefitfromexercise. 1Whichofthefollowingisthebesttitleforthepassage? A.ExerciseMightBenefitAgingMuscles B.ExerciseMightIncreaseAgingMuscles C.ExerciseMightDoHarmtoMitochondria D.AgingMainlyOccursintheCellularLevel 2WhatcanweknowabouttheexperimentmentionedinParagraph2? A.Volunteerscannotbegoodatexercising. B.Allvolunteersmusthavethesamebaseline. C.Itwascarriedoutamongtheyouthofdifferentsexes. D.Volunteersreceivedarandomparticularexerciseprogram. 3HowdoestheauthordevelopParagraph3? A.Byanalyzingeverygroup'sdifferentdata. B.Bycomparingeverygroup'strainingtime. C.Bylistingeverygroup'sdifferenttraining. D.Bydescribingeverygroup'strainingresults. 4ItcanbeinferredfromParagraph4that. A.theexperimentdidnotgetexpectedresults B.ridingexercisebikeshasnoinfluenceonthevolunteers C.weightliftingisthemostusefultrainingamongtheseexercises D.intervaltrainingbringsstrongerinfluencetotheelderthantotheyouth 5Theunderlinedwordcontaincanbereplacedby. A.change B.stop C.record D.cause
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Ifyouwanttoleadahappylifeyou'dbetterlearntoacceptlifeitis. A.as B.that C.which D.where
2017年我县高考创历史之最其中600分以上共103人一本上线共938人.假定你是李华想邀请好友Peter一起参加学校举办的优秀学生高考经验交流会exchangeconference.请给他写封邮件内容包括1.交流时间地点2.交流内容. 注意1.词数100左右2.可以适当增加细节以使行文连贯. DearPeter Yours LiHua
在真核细胞的内质网和细胞核中能够合成的物质分别是
下列不利于人体散热的是
Asurveyhasshownthatwhatyoudoonaplanecanbedeterminedbywhichnationalityislistedonyourpassport. AccordingtotheresultsofaninternationalpassengersurveyAustraliansarethebiggestdrinkersonboardwith36percentchoosingtodownthehatchcomparedto35percentofAmericansand33percentofBrits. TheAirlinePassengerExperienceAssociationAPEXspoketoaround1500peopleaged18andolderwhohavetraveledbyplaneatleastonceduringthelastthreemonthsandwerelivingintheUnitedStatesUnitedKingdomGermanyJapanChinaSingaporeAustraliaorBrazil. TheresultsfoundChinesetravelersaremostlikelytonodoffoncetheseat﹣beltsignswitchesoff.Theyarealsothefirsttoreachfortheircreditcardforsomein﹣flightshoppingandthebiggestfansofgaming.Americansontheotherhandliketousetheirtimeintheairmoreproductively﹣﹣﹣whennotdrinking﹣﹣﹣choosingtoworkwhileflyingat35000feet. MeanwhileBritsandGermansarethebestatmakingchatwithrandomstrangers﹣﹣﹣spending50percentmoretimethananyothernationality.ComparativelyBraziliansconducttheirconversationsonlineviaemailmessagingappsorsocialmedia. Despiteplanefoodhavingabadreputationsevenoutoftenintervieweessaidtheywerehappytoeatupontheselectionofin﹣flightsnacksandmeals.In﹣flightmagazineswerealsopopularwithfouroutoffivepassengersclaimingtoreadthem. Theinternationalflyersdidhoweverexpresstheirdesireforbetterin﹣flightentertainment.TheindustryhasgreatlyimprovedthecomfortentertainmentandonboardserviceandpassengersareacceptingthoseimprovementssaidRussellLemieux.APEXexecutivedirector.Atthesametimepassengersaredemandingmorefromtheirairtravelexperienceswhichwilldrivemoreimprovementstouchingallaspectsofthejourneyheadded. 1WhatcanyouprobablyseeintheflightaccordingtothepassageB A.Brazilianschoosetodrink. B.Germanschattokilltheirtime. C.Americansdoin﹣flightshopping. D.TheChineseswitchofftheseat﹣beltsign. 2WhenonboardtheplaneA. A.mostpassengersliketoreadin﹣flightmagazines B.passengersfromonenationhavelittleincommon C.morethanhalfofthepassengersdon'tenjoyplanefood D.mostpeopletendtousein﹣flighttimetohaveagoodsleep 3WhatcanwelearnfromthelastparagraphD A.Flyerscarelittleaboutentertainment. B.Flyersareexpectingbetterflightexperiences. C.Flyersarenotsatisfiedwiththeimprovement. D.Flyershavemoreandmoredemandsfromairlines. 4What'sthepurposeofthepassageD A.Toentertainreaderswithinterestingstories. B.Toencouragepeopletobehavewellinpublic. C.Tocriticizeimpolitebehaviorsontheplane. D.Toinformreadersoftheresultsofasurvey.
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Hegetsupatsixo'clockrunsforhalfanhourandthenhasamealthatishismorning. A.route B.routine C.behavior D.tendency
已知椭圆C+=1a>0b>0的长轴长为4离心率为. Ⅰ求椭圆C的方程 Ⅱ当a>b时设Mm0m∈R过M作直线l交椭圆C于PQ两点记椭圆C的左顶点为A直线APAQ的斜率分别为k1k2且k1k2=-求实数m的值.
SurfingFamousBeachesFamousWaves NorthShoreOahuHawaiiFamousforbeingthebirthplaceofsurfing Widesandybeachesstretchnearly20milesalongthePacificOcean.BetweenDecemberandFebruarythissurfingdestinationissuitableonlyforexperiencedsurfersasitsbigwavescanreach30feet.Insummertheoceancanbealmostcompletelyflatmakingitperfectforswimming. HuntingtonBeachCaliforniaFamousfortheUSOpenofSurfingcompetition Thisbusy8.5﹣mile﹣longbeachattracts8millionvisitorsayearforbodysurfingboogieboarding趴板冲浪andboardsurfingateverylevelbeginnertoexpert.Atnightthebeach'sfirepits深坑drawfamiliesasmuchasthewavesdoduringtheday.Thebesttimeforsurfersiswinterwhentheswellscanhit15feet. JeffreysBaySouthAfricaFamousforbeingthesettingoftheclassicmovieTheEndlessSummer Thisareaoftheoceanmaycontainthemostconsistentwavesontheplanetwithsomeupto10feet.ThebestwavesarebetweenlateMayandlateAugust.Thebeachsometimesclosesbecauseofsharksbutatothertimessurfersareluckyenoughtosurfalongsidedolphins. TamarindoCostaRicaFamousforbeingfeaturedinthemovieTheEndlessSummerII Thisbeachhaswavesupto12feethighwhicharegoodforlong﹣boardersorshort﹣boardersbeginnersorexpertswiththebestwavesfromApriltoJuly.Bodysurfingisnotrecommendedbecauseofoffshorerocks.Thelaid﹣backatmosphereandnearlyperfectyear﹣roundweathermakeitfeelliketheCaliforniabeachesofthe1950s. 1Thebeachwiththebiggestwavesis. A.Oahu'sNorthShore B.HuntingtonBeach C.JeffreysBay D.Tamarindo 2JeffreysBayandTamarindoarebothknownfor. A.offshorerocks B.competitions C.movies D.dolphins 3HowareNorthShoreandHuntingtonBeachsimilar? A.Bothbeachesarethesamelength. B.Botharesuitableforallsurfinglevels. C.Thewavesarebothperfectforbodysurfing. D.Winteristhebesttimetosurfatbothbeaches. 4Whatdoestheunderlinedwordlaid﹣backmeaninEnglish? A.Worried. B.Relaxed. C.Excited. D.Depressed. 5TheHuntingtonBeachinformationdiffersfromtheothersinthatitincludes. A.theheightofthewave B.theweatherconditions C.thebesttimetovisit D.thenumberofvisitorseachyear
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ExceptfortheIndianstheearliestbackpackersinAmericawerefrontiersmen边民whotraveledthewildernesslookingeitherfornecessitiessuchasfoodandwaterorforsourcesofwealthsuchasfurandgoldForthembackpackingwasawayofsurvivalorameansofachievingwhatonedaywouldbecalledtheAmericanDream.Todayhowevermanypeopleenjoybackpackingasanentertainingactivity.Shoulderingapackandleavingbehindtheworldoftelephonetelevisionandtrafficpromiseanexcitingexperience.Testingone'sstamina耐力andskillsischallengingandregainingasenseofone'splaceinthenaturalworldcanberewarding. Moreoverbackpackingisanactivitythatcanlastanylengthoftimeandcanbeenjoyedaloneorwithfriends.Thentooabackpackingtripmaybeorganizedwithinadayortwo. Thebackpackerandhisfriendshaveonlytodecideontheirdestinationandthenorganizetheall﹣importantequipmentwhosecontentstheymustdependonthetrip.Amapacompassaflashlightalongwithfoodandextraclothingcanbefoundwithoutmuchdifficulty.Oncethebackpackershaveleftwordaboutwheretheygoinanoteontherefrigeratordoororinamessageonanansweringmachinetheycanlookforwardtoanadventurethatwillliftthespiritandpromotethesoul.TheiroutingwillenablethemtoreturninashorttimetotheageoftechnologywiththecourageandindependenceofNattyBumppowhodidindeedbelongtotheageofthefrontier. 1EarlybackpackerswereinterestedinfindingB. A.activitiesinlife B.dailynecessitiesandwealth C.senseoftheirplaceintheworld D.meansofhecomingfamous 2OneoftheadvantagesofbackpackingisthatC. A.itisnotsochallengingasotheractivities B.itdoesnotrequirepeopletodecideonadestination C.itcanhelppeopleconnectwithnature D.itmustbedoneingroupsandcancureone'sloneliness 3ThetextmainlydiscussesD. A.theearlybackpackers B.howtobeabackpacker C.thefutureofbackpacking D.thereasonforpeople'sinterestinbackpacking
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. Iliveinasmallvillageinthecountry.MywifeandIranthevillageshop.Wehaveaverypeacefullifeboredsomeonemightsay.Butweloveit.Weknowallthepeopleinvillageandhaveplentyoftimetostopandchat.Ihaveplentyoftimeformyhobbytoogardeningfishingwalkinginthecountryside.Ilovetheoutdoor'slife.Ididn'talwayslikethisthough.Iusedtohaveaverystressjobworkingtilllateintheofficeeveryeveningandneverbringworkhomeattheweekend.Mywifecomplainedthatheneversawme.AndIhadnotimetofamilylife.Thismademerealizehowwasreallyimportanttome.NowI'mafraidoflookingbacksincethepastlifeseemedahorribledream.
It's3008.Youhaveajobafamilyandyou'reabout40yearsold!Welcometoyourfuturelife. Gettingreadyforworkyoupauseinfrontofthemirror.Turnredyousay.Yourshirtchangesfromskybluetodeepred.Tinypreprogrammedelectronsarerearrangedinyourshirttochangeitscolor.Lookingintothemirroryoufindithardtobelievethatyouare40.Youlookmuchyounger.Withamazingadvancesinmedicinepeopleinyourgenerationmaylivetobe150yearsold.Youarenotevenmiddle﹣aged. AsyougointothekitchenandpreparetopouryourbreakfastcerealintoabowlyouhearToloseweightyoushouldn'teatthatfromyourshoes.Theyreadthetinyelectroniccodeonthecerealboxtofindoutthenutritiondetails.Youdecidetolistentoyourshoes.KitchenwhatcanIhaveforbreakfastAlistofpossiblefoodsappearonthecounteraskitchenchecksitsfoodsupplies. Readyforyourtriptospace.Youaskyoursonanddaughter.In2017onlyspeciallytrainedastronautswentintospace﹣andveryfewofthem.Todayanyonecangotospacefordaytriporlongervacation.Yourbestfriendevenworksinspace.HandingyourchildrenthreestrawberrieseachyouaddThedoctorsaidyouneedtheseforspacetravel.Thankstomedicaladvicevaccinationshotsareathingofthepast.Ordinaryfoodscontainspecificvaccines疫苗.Withtheberriesintheirmouthsthekidsheadforthefrontdoor. It'stimeforyoutogotowork.Yourcarchecksyourfingerprintsandunlocksthedoors.Myofficeautopilot.Youcommand.Yourcardrivesitselfdowntheroadandmovesmoothlyintotrafficonthehighway.Yousitbackandunrollyoure﹣newspaper.Thelatestnewsdownloadsandfillstheviewer.Lookingthroughthepagesyouwatchthenewsasvideofilmsratherthanreadit. 1ThepassageaboveisorganizedinorderofD. A.frequency B.importance C.preference D.time 2Ctransformsthecolorofyourclothingintoanotherin3008. A.Themirror B.Thecounter C.Theclothingitself D.Themedicine 3Theshoesknowthatyoushouldn'teatthebreakfastcerealwiththehelpofA. A.checkingthenutritiondetailsofthefood B.listeningtothedoctor'sadvice C.testingthefoodsuppliesinthekitchen D.pouringthebreakfastintoabowl 4ThestrawberriesthechildreneatserveasD. A.nutrition B.breakfast C.lunch D.vaccines
—Shallweputofftheexperimenttillnextweek? —.Idon'tthinkourteacherwillbehappywithit. A.Nevermind B.Suregoahead C.Yesbetternot D.I'drathernot
某种H+﹣ATPase是一种位于膜上的载体蛋白具有ATP水解酶活性能够利用水解ATP释放的能量逆浓度梯度跨膜转运H+.①将某植物气孔的保卫细胞悬浮在一定pH的溶液中假设细胞内的pH高于细胞外置于暗中一段时间后溶液的pH不变.②再将含有保卫细胞的该溶液分成两组一组照射蓝光后溶液的pH明显降低另一组先在溶液中加入H+﹣ATPase的抑制剂抑制ATP水解再用蓝光照射溶液的pH不变.根据上述实验结果下列推测不合理的是
1WhenBrantleyHarrisonandherfamilyrescuedatinyinjuredsquirrelbackinOctober2010thenreleasedherbackintothewildtheydidn'texpecttoeverseeheragain.NineyearslaterhoweverlittleBellatheycalledthesquirrelBellastillcomestovisitthemalmosteveryday﹣aslongassnacksareprovidedofcourse. Asababytheterribleattackmadebyanowl猫头鹰leftBellaneardeathshewascarefullytakeninbytheGreenvilleCountySouthCarolinafamilyandraisedbythemalongsidethreeothersquirrelsnamedLarryCurlyandMoe.BellastayedwiththeHarrisonsuntilspring2011atwhichpointshehadhealed痊愈successfullythankstoaregulardietoffruitnutsandbabyfoodandwasreadytojumponthetreesintheforest.Thesweetsquirrelnevergoestoofarfromheradoptedhomethoughandstopsbytosayhellowhenevershecandespitehowmuchtimehaspassed. Bellasitsrightatthefrontdoorwaitingforsomeonetonoticeshehascomebyforavisit.IfnoonenoticeshershewilljumpovertothediningroomwindowtowaitforsomeonetoseeherBrantleytoldTheDodo.Thelittleladyjustisn'treadytopartwiththefamilythatsuccoredherlife.Whenevershestopsbysheasksfornothingmorethanahandfulofnuts. Whatisthemostamazingpart?AfewyearsafterBella'soriginalstayattheHarrisonhouseshefoundherwaybacktothemwithaninjuredfoot﹣andabellyfullofbabies﹣spendinganotherfewmonthsofrecovering.ItwastrulyamazingtowatchthebabyIraisedraiseherownbabiesBrantleysaid.BellanowevenhasherownInstagrampagewhereherhumanfamilydocumentsheradventureswithalmost4thousandfollowers! 1WhenwaslittleBellatakentoBrantleyHarrison'shome?nomorethan10words 2WhatdidtheHarrisonsdotoBellawhensherecovered?nomorethan10words 3Whatdoestheunderlinedwordinthethirdparagraphmean?1word 4WhathappenedwhenBellacamebacktotheHarrisonsafterafewyears?nomorethan15words 5Whatdoyouthinkaboutthisnews?Pleaseexplain.nomorethan20words
回答下列与生态系统相关的问题. 1在森林生态系统中生产者的能量来自于生产者的能量可以直接流向答出2点即可. 2通常对于一个水生生态系统来说可根据水体中含氧量的变化计算出生态系统中浮游植物的总初级生产量生产者所制造的有机物总量.若要测定某一水生生态系统中浮游植物的总初级生产量可在该水生生态系统中的某一水深处取水样将水样分成三等份一份直接测定O2含量A另两份分别装入不透光甲和透光乙的两个玻璃瓶中密闭后放回取样处若干小时后测定甲瓶中的O2含量B和乙瓶中的O2含量C.据此回答下列问题. 在甲乙瓶中生产者呼吸作用相同且瓶中只有生产者的条件下本实验中C与A的差值表示这段时间内C与B的差值表示这段时间内A与B的差值表示这段时间内.
物质W是一种含氮有机物会污染土壤.W在培养基中达到一定量时培养基表现为不透明.某研究小组欲从土壤中筛选出能降解W的细菌目标菌.回答下列问题. 1要从土壤中分离目标菌所用选择培养基中的氮源应该是. 2在从土壤中分离目标菌的过程中发现培养基上甲乙两种细菌都能生长并形成菌落如图所示.如果要得到目标菌应该选择菌落进一步纯化.选择的依据是. 3土壤中的某些微生物可以利用空气中的氮气作为氮源若要设计实验进一步确定甲乙菌能否利用空气中的氮气作为氮源请简要写出实验思路预期结果和结论即. 4该小组将人工合成的一段DNA转入大肠杆菌使大肠杆菌产生能降解W的酶酶E.为了比较酶E与天然酶降解W能力的差异该小组拟进行如下实验请完善相关内容. ①在含有一定浓度W的固体培养基上A处滴加含有酶E的缓冲液B处滴加含有相同浓度天然酶的缓冲液C处滴加三处滴加量相同. ②一段时间后测量透明圈的直径.若C处没有出现透明圈说明若AB处形成的透明圈直径大小相近说明.
下列有关高尔基体线粒体和叶绿体的叙述正确的是
Youcangetalotfrombeinghealthy.Everyoneneedstotaketimetoexercise.1DHerearesometipsonhowtomakebetteruseofyourfreetimewhilestayinghealthy. 2GMakesurethatyourjoints关节andbodyorgansarekeptingoodworkingorder.Exercisecanalsohelpkeepyourweightatahealthylevelandcanprotectyoufromcatchingcoughsandcolds.Otherbenefitsareanincreaseinyourenergylevelandbrainactivity.Knowingthatyou'relookingandfeelinggoodcanalsoincreaseyourself﹣confidence.Ifyou'reunder18youshouldtrytodoatotalof60minutesofphysicalactivityeveryday.Thisincludesanythingfromtakingtheliftatthegymtowalkingupstairs.3A Gettingfitisn'tallaboutgyms﹣someformsofexercisewon'tcostyouanymoneyandmostformscanbeeasilyusedinyourbusylifewithouttakingsomespecialtimeinyourday.4C 5EPlayingteamsportslikefootballorbasketballisgreatexerciseanditisoftenmoreenjoyablebecauseyou'replayingwithagroupoffriends. A.Anygrown﹣upneedsatleasthalfanhourofexerciseatleastfivedaysaweek. B.Don'tdoexerciseifyouarebusy. C.Forexampleridingabiketoschoolorworkcanimproveyourfitnesslevel. D.Therearelotsofwaystoimproveyourhealth. E.Gettingfitisn'tjustsomethingyouhavetodobyyourself. F.Oneshouldtrytosavemoneyforjoiningagym. G.Keepingphysicallyactiveisbeneficial.
Mr.Greenwasveryfamouswhenhelivedthere.Thereistobesomeoneinthisdistrictwhoremembershim. A.content B.opposed C.bound D.restricted
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