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在区间[﹣,]上任取一个数x,则函数f(x)=3sin(2x﹣)的值不小于0的概率为( )
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函数fx=3sin的图像为C.①图像C.关于直线x=π对称②函数fx在区间内是增函数③由y=3sin
3
2
1
0
设函数fx=ax+x>1a是从123三个数中任取的一个数b是从2345四个数中任取的一个数则fx>b
已知函数.1若ab都是从01234五个数中任取的一个数求方程fx=0的概率.2若ab都是从区间[04
设关于x的一元二次方程1若a是从—4—3—2—1四个数中任取一个数b是从123三个数中任取一个数求上
在区间[02]上任取两个实数ab则函数fx=x3+ax-b在区间[-11]上有且只有一个零点的概率是
在区间[15]上任取一个数m则函数y=x2-4x-20≤x≤m的值域为[-6-2]的概率是.
在区间[0π]上随机取一个数x则事件sinx+cosx≥发生的概率为.
已知函数fx=3sinωxω>0的周期是π将函数fx的图象沿x轴向右平移个单位得到函数y=gx的图象
g(x)=3sin(2x﹣
)
g(x)=3sin(2x﹣
)
g(x)=﹣3sin(2x+
)
g(x)=﹣3sin(2x+
)
2017年·辽南模拟5已知函数fx=Asinωx+φA>0|φ|<的图象在y轴左侧的第一个最高点为﹣
f(x)=3sin(
﹣2x)
f(x)=3sin(2x﹣
)
f(x)=3sin(
﹣2x)
f(x)=3sin(2x﹣
)
函数fx=3sin的图象为C.①图象C.关于直线x=π对称②函数fx在区间内是增函数③由y=3sin
已知函数fx=-x2+ax-b.1若ab都是从01234五个数中任取的一个数求fx有零点的概率2若a
已知函数fx=﹣x2+ax﹣b.1若ab都是从01234五个数中任取的一个数求上述函数有零点的概率.
在区间上随机取一个数x则sinx+cosx∈[1]的概率是________.
在区间[03]上任取一个数x使得不等式x2-3x+2>0成立的概率为________.
设关于x的一元二次方程+2ax+b=01若a是从0123四个数中任取的一个数b是从012三个数中任取
已知函数R.是常数.1若a是从-2-1012五个数中任取的一个数b是从012三个数中任取的一个数求函
已知函数fx=3sin2x-.1求函数fx的最小正周期最小值2求函数fx图象的对称中心3求函数fx的
设函数fx=log2[x2-2a-1x+b2]的定义域为D.1若a是从1234四个数中任取的一个数b
已知函数fx=x2-2ax+b2ab∈R.1若a从集合{0123}中任取一个元素b从集合{012}中
设有关于x的一元二次方程x2+2ax+b2=0.1若a是从0123四个数中任取的一个数b是从012三
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InChinawecanseeeverywherethatsomepedestrianstendtoruntheredlightingroupswhencrossingthestreet.ThisphenomenonhasattractedwidespreadconcerninChina.RecentlyBeijinggovernmentannouncedthatpeoplewhodonotwaitforthegreenlighttocrosstheroadwillreceiveafineof10yuan.What'smoreusingthediagonaltocrosstheroadisalsoagainsttherules.WalkersshouldwalkinanLshape. BesidesBeijingmanyplaceshavealsotakenstepstostopChinesestyleroadcrossing.ProvincessuchasSichuanShanxiandZhejianghavealreadystartedtofinejaywalkers5to50yuansincelastyear.Thispunishmentcancallonpeopletorealizetheimportanceoftrafficsafety.Howevermanypeoplecomplainthattheredlightslasttoolong.EveryoneshouldfollowtherulesorthecountrywillloseitsordersaidPeopleDaily. Somecitieshavealsopaidattentiontotheproblem.ForexampleBeijinggovernmentsaiditshouldnotonlypunishthesejaywalkersbutalsoimproveroadsafetyfacilitiessuchasproperlyfixingtrafficlightsandbuildingoverpasses. Anyhowsafetymustcomefirst. 【写作内容】 1.以约30个词概括上文的主要内容; 2.以约120个词发表你对中国式过马路的看法内容包括: 1指出由此造成的影响; 2分析出现这种现象的原因; 3针对这个现象提出建议. 【写作要求】 1.作文中可以使用亲身经历或虚构的故事也可以参照阅读材料的内容但不得直接引用原文中的句子. 2.作文中不能出现真实姓名和学校名称. 【评分标准】 概括准确语言规范内容合适语篇连贯. .
A.IAmaPencil SamSwope'sjobwasteachingwritingtothird﹣gradersinNewYorkCity.Hisstudentswerefrom21countriesspeaking11languageswithdifferentbackgrounds.Buttherewereafewthingstheyhadincommon.Familytroubles.Moneystruggles.Andpoetry.Everysinglestudentwiththehelpofthiscreativeteachercameforthwithawesomewriting. B.BetweenaRockandaHardPlace AronRalston28wenthikinginaremoteUtahcanyonwithouttellinganyone. Anunexpectedcatastrophestruck.WithoutenoughsuppliesRalstonknewhissituationwasfullofdanger.Afterfivedayshewasinafightagainstdeath.Thatwaswhenhecarriedoutacourageousplan.Hisamazingsurvivalstoryrestsataplaceamongtheclassicsofthegenre. C.OurBrother'sKeeper AuthorJedwinSmithspent30yearstryingtoholdbackallmemoriesofhisbrotherJeffwhowaskilledinVietnam.ButinOurBrother'sKeeperhetellswhathappenswhentheInternetbringshimintocontactwithseveralhisbrother'soldMarinefriendsincludingtheguywhoheldJeffinhisarmsashedied.Firstviae﹣mailandtheninpersonSmithgetstoknowthesemen. D.TheAllAmericans WithhisgraduationfromWestPointHenryRomaneksailedtowardOmahaBeachontheeveofD﹣day.ItwasJune1944andhewasabouttofacethebloodiestbattleofhislife.JustyesterdayitseemedhewasastandoutsoldierontheArmyteam.Nowhewasaleaderofyoungstersinbattlefightingforhiscountryandthefutureofthefreeworld. E.CopiesinSeconds Withthepushofabuttonanyonecanmakecopiesofalmostanything.InCopiesinSecondsDavidOwenshowedhowashyengineernamedChesterCarlsonperfectedhisxerographymachineandshoppeditarounduntilfinallyhookingupwiththeHaloidCorporation.ThatpartnershipledtotheXeroxcopierandchangedthefaceofworkforever. F.StateofGrace Backinthelate1950sandearly1960stheLynvetswasjustafoot﹣ballteaminasandyNewYorkCityneighborhood.Buttomostofitsmemberstheteamwastheironlyexperienceofahappyfamilytheironlychancetoriseabovebadeverydaycircumstancestheironlyshotatbeingheroes.Thefriendshipsthesemenformedsustainedthemthroughouttheirlives. 请阅读以下求书者的信息然后匹配他们所要寻找的书籍: 1.Kateisdoingresearchintohistory.RecentlyshebecomesinterestedinthehistoryaboutWorldWarII.Shenowwantstofindabookaboutthestoriesofthesoldiersatthattime. 2.Tomisateacherandinterestedinhikingandclimbingverymuch.Nowheislookingforabookaboutthehikingstoriestohelphiminhisfollowingoutdooractivities. 3.Jackisresearchingintoeducationinacollege.Heisespeciallyinterestedintheteachingmethods.Hewantstofindabookwhichcantellhimsomethingabouthowtoteachstudentsfromdifferentbackgrounds. 4.Johnisanexpertonmilitaryaffairs.HewantstofindsomematerialsaboutthesoldiersinVietnamWartocarryonhisnewresearch. 5.Markisstudyingscience.Nowadayshewantstoresearchintothehistoryoftechnologicaldevelopment.Hefirsthopestofindabookaboutthedevelopmentofthecopierswhichhavechangedourworldgreatly.
半径为R的两个较大的金属球放在绝缘桌面上若两球都带等量同种电荷Q时它们之间的静电力为F1两球带等量异种电荷Q与﹣Q时静电力为F2则
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用体外实验的方法可合成多肽链.已知苯丙氨酸的密码子是UUU若要在体外合成同位素标记的多肽链所需的材料组合是 ①同位素标记的tRNA ②蛋白质合成所需的酶 ③同位素标记的苯丙氨酸 ④人工合成的多聚尿嘧啶核苷酸 ⑤除去了DNA和mRNA的细胞裂解液
在探究影响电荷间相互作用力的因素时有图示实验系在丝线上的带正电的小球A恰与带正电的物体B等高而处于静止状态丝线与竖直方向的夹角为θ.则 A.若仅减小A的电量θ将保持不变 B.若仅减小B的电量θ将保持不变 C.改变B的电量上下移动B的位置使θ不变则A受到的库仑力不变 D.改变B的电量左右移动B的位置使θ不变则A受到的库仑力不变
用NA表示阿伏加德罗常数下列说法正确的是
LastSundaymytrainwasdelayedfortwohours.Ihadplentyoftimeto1.AfterbuyingsomenewspaperstoreadonthejourneyImademywaytothe2officetocollectmyheavysuitcaseIhadlefttherethreedaysbefore.Therewereonlyafewpeople3andItookoutmywallettofindthereceiptformycase.Thereceiptdidn'tseemtobewhereIhadleftit.I4thecontentsandrailwayticketsmoneyscrapsofpaperandphotosfelloutofit.ButnomatterhowhardIsearchedthe5wasnowheretobefound. WhenmyturncameIexplainedthesituation6totheassistant.Themanlookedatmeupanddownasiftosaythathehadheardthiskindofsadstorymanytimesandaskedmeto7thecase.Itoldhimthatitwasanoldbrownlooking8nodifferentfromthemanycasesIcouldseeontheshelves.Theassistantthengavemean9andtoldmetomakealistofthechiefcontentsofthecase.Iftheywere10hesaidIcouldtakethecaseaway.ItriedtorememberallthearticlesIhad11packedintothecaseinashorttimeandwrotethemdownastheycametome. AfterIhaddonethisIwentto12amongtheshelves.Therewerehundredsofcasesthere.Foronedreadfulmomentit13tomethatifsomeonehadpickedthereceiptuphecouldhaveeasilyclaimedthecasealready.Thishadn'thappened14forafteratimeIfoundthecaselyinginacorner.Afterexaminingthearticlesinsidetheassistantwas15andtoldmeIcouldtakethecaseaway. 1.A.waste B.spare C.arrange D.make 2.A.tourist B.luggage C.ticket D.head 3.A.standing B.crowding C.talking D.waiting 4.A.threw B.gathered C.checked D.emptied 5.A.newspaper B.receipt C.case D.shelf 6.A.easily B.excitedly C.gladly D.sorrowfully 7.A.describe B.draw C.examine D.show 8.A.object B.bag C.pocket D.wallet 9.A.address B.envelope C.message D.form 10.A.good B.wrong C.correct D.ready 11.A.carelessly B.suddenly C.hurriedly D.immediately 12.A.look B.watch C.find D.see 13.A.happened B.occurred C.appeared D.seemed 14.A.fortunately B.unluckily C.hopefully D.presently 15.A.disappointed B.surprised C.satisfied D.worried
下列关于细胞中能量代谢的叙述错误的是
在真空中两个点电荷带有相等的电荷量要求它们之间相距1m时的相互作用力等于1N若静电力常量k=9×109Nm2/C2则每个电荷的电荷量是多少等于电子电荷量的多少倍
Plantscan'tcommunicatebymovingormakingsoundsasmostanimalsdo.Insteadplantsproducevolatilecompoundschemicalsthateasilychassefromaliquidtoagas.Aflower'ssweetsmellforexamplecomesfromvolatilecompoundsthattheplantproducestoattractinsectssuchasbugsandbees. PlantscanalsodetectvolatilecompoundsproducedbyotherplantsAtreeunderattackbyhungryinsectsforinstancemaygiveoffvolatilecompoundsthatletothertreesknowabouttheattack.Inresponsetheothertreesmaysendoffchemicalstokeepthebugsaway﹣﹣﹣orevenchemicalsthatattractthebugs'naturalenemies. Nowscientistshavecreatedaquickwaytounderstandwhatplantsaresaying:achemicalsensor传感器calledanelectronicnose.Thee﹣nosecantellcompoundsthatcropplantsmakewhenthey'reattacked.Scientistssaythee﹣nosecouldhelpquicklydetectwhetherplantsarebeingeatenbyinsects.Buttodaytheonlywaytodetectsuchinsectsistovisuallyinspectindividualplants.Thisisachallengingtaskformanagersofgreenhousesenclosedgardensthatcanhousethousandsofplants. Theresearchteamworkedwithane﹣nosethatrecognizesvolatilecompounds.Insidethedevice13sensorschemicallyreactwithvolatilecompounds.Basedontheseinteractionsthee﹣nosegivesoffelectronicsignalsthatthescientistsanalyzeusingcomputersoftware. Totestthenosetheteampresenteditwithhealthyleavesfromcucumberpepperandtomatoplantsallcommongreenhousecrops.Thenthescientistscollectedsamplesofairarounddamagedleavesfromeachtypeofcrop.Theseplantshadbeenchangedbyinsectsorbyscientistswhomadeholesintheleaveswithaholepunch打孔器. Thee﹣noseitturnsoutcouldidentifyhealthycucumberpepperandtomatoplantsbasedonthevolatilecompoundstheyproduce.Itcouldalsoidentifytomatoleavesthathadbeendamaged.Butevenmoreimpressivethedevicecouldtellwhichtypeofdamage﹣byinsectsorwithaholepunch﹣hadbeendonetothetomatoleaves. Withsomefine﹣tuningadevicelikethee﹣nosecouldonedaybeusedingreenhousestoquicklyspotharmfulbugstheresearcherssay.AdevicelikethiscouldalsobeusedtoidentifyfruitsthatareperfectlyripeandreadytopickandeatsaysNataliaDudareveabiochemistatPurdueUniversityinWestlafayetteInd.whostudiessmellsofflowersandplants.Hopefullyscientistsbelievethedevicecouldbringlargebenefitstogreenhousemanagersinthenearfuture. 1.Welearnfromthetextthatplantscommunicatewitheachotherby. A.makingsomesounds B.wavingtheirleaves C.producingsomechemicals D.sendingoutelectronicsignals 2.Whatdidthescientistsdotofindoutifthee﹣noseworked? A.Theypresenteditwithallcommoncrops. B.Theyfixed13sensorsinsidethedevice. C.Theycollecteddifferentdamagedleaves. D.Theymadetestsondamagedandhealthyleaves. 3.Accordingtothewriterthemostamazingthingaboutthee﹣noseisthatitcan. A.pickoutripefruits B.spottheinsectsquickly C.distinguishdifferentdamagestotheleaves D.recognizeunhealthytomatoleaves 4.Wecaninferfromthelastparagraphthatthee﹣nose. A.isunabletotellthesmellofflowers B.isnotyetusedingreenhouses C.isdesignedbyscientistsatPurdue D.ishelpfulinkillingharmfulinsects 5.Whichsectionofnewspaperdoesthepassageprobablybelongto? A.Sport B.Life C.Discovery D.Entertainment
Cancerisfearedbyeveryone.Andthisfearisreachingepidemic流行性proportions.Notthediseaseitself﹣thereisnosuchthingasacancerepidemic.Exceptforlungcancermostlycausedbycigarettesmokingtheincidencerates发病率arelevelingoffandinthecaseofsomekindsofcanceraredecreasing.ButthefearofcanceriscatchingandthecountrystandsatriskofananxietyTheearthitselfiscomingtoseemlikeahugecarcinogen致癌物.Theordinarymoreorlessscientificstatementthatsomethingbetween80and90percentofallcancersareduetothingsintheenvironmentistakentomeanthatnoneofuswillbesafeuntilthewholeenvironmentiscleanedup.Thisisnotatallthemeaning. The80﹣percentcalculationisbasedontheunthinkabledifferencesintheincidenceofcancerinvarioussocietiesaroundtheworld﹣forexamplethehighproportionoflivercancerinAfricaandtheFarEaststomachcancerinJapanbreastcancerinWesternEuropeandNorthAmericaandtherelativelylowfiguresforbreastcancerinJapanandpartsofAfricaandforlivercancerinAmerica.Thesedataindicatetheremaybespecialandspecificenvironmentalinfluenceslargelybasedonpersonallife﹣stylethatdeterminetheincidenceofvariousformsofcancerindifferentcommunities﹣butthatisallthedatasuggest.Theoverallincidenceofcancercountingupallthecasesisprobableroughlythesameeverywhere. 1.Whichofthefollowingisclosesttomeaningtothephraselevelingoff? A.Becameverypopular B.Reacheditslowestlevelinpopularity C.Stoppedbeingpopular D.Stoppedincreasingitspopularity 2.Accordingtothepassagetheincidenceofcancerisgenerallybelieved A.tobebasedoninactivelifestyle B.tobeduetoanxiety C.toresultfromenvironmentalinfluences D.tobecausedbyheavysmoking 3.Itcanbeinferredfromthepassagethatthewriter'sopinionabouttherelationshipbetweencancerandenvironmentis. A.positive B.negative C.neutral D.approving 4.Accordingtothepassagethewriterseemstofeelthat. A.theriskofcatchingcancerisontherise B.thewholeearthiscomingtoseemlikeahugecarcinogen C.theriskofcatchingcancerisn'tsogreataspeoplethink D.cancercanbecurediftheenvironmentiscleanedup 5.Whichofthefollowingwouldbethebesttitleforthepassage? A.CancerandEnvironment B.TheFearCausedbyCancers C.DataonCancerIncidence D.CanceranditsInvestigation
下列符号中表示电容器的是
研究表明蛙未受精卵细胞的细胞质中储存有大量的mRNA.蛙卵在生理盐水中能正常合成mRNA而物质甲会抑制mRNA的合成.通过设计实验检测蛋白质合成量探究蛙受精卵早期分裂过程中20小时内蛋白质合成所需要的mRNA来源于卵细胞中原本储存的mRNA还是卵细胞受精后新合成的.下列相关叙述正确的是
人的排尿是一种反射活动.回答下列问题. 1膀胱中的感受器受到刺激后会产生兴奋.兴奋从一个神经元到另一个神经元的传递是单向的其原因是. 2排尿过程的调节属于神经调节神经调节的基本方式是反射.排尿反射的初级中枢位于.成年人可以有意识地控制排尿说明排尿反射也受高级中枢控制该高级中枢位于. 3排尿过程中尿液还会刺激尿道上的从而加强排尿中枢的活动促进排尿.
如图是不同浓度的24﹣D溶液对洋葱生根影响的实验结果分析正确的是
基因工程中可以通过PCR技术扩增目的基因.回答下列问题. 1基因工程中所用的目的基因可以人工合成也可以从基因文库中获得.基因文库包括和. 2生物体细胞内的DNA复制开始时解开DNA双链的酶是.在体外利用PCR技术扩增目的基因时使反应体系中的模板DNA解链为单链的条件是.上述两个解链过程的共同点是破坏了DNA双链分子中的. 3目前在PCR反应中使用Taq酶而不使用大肠杆菌DNA聚合酶的主要原因是.
如图所示的各电场中AB两点电场强度相等的图是
干扰素能抑制病毒的复制可增强巨噬细胞和T淋巴细胞的活力从而起到免疫调节作用.下图是利用基因工程技术生产干扰素的操作过程示意图请据图回答. 1图中①代表的是过程所获得的甲是. 2在生物体外重复②③④的步骤可以获得大量的甲这是技术.其中过程③需要酶. 3与人体细胞中干扰素基因相比甲不含有非编码区和. 4在利用甲乙获得丙的过程中必须用同一种切割甲和乙使它们产生相同的再加入连接形成丙. 5科学家将甲与的启动子等调控组件重组在一起形成的基因表达载体通过方法导入到哺乳动物的中进行早期胚胎培养当胚胎发育到阶段时进行胚胎移植同时__母体对移入子宫的胚胎基本上不发生才为移入的胚胎在__母体内的成活提供了可能使其生长发育成转基因动物.该动物进入泌乳期后可以通过分泌的乳汁中获得.
如图所示负电荷仅受电场力作用沿虚线从A点运动到B点则运动过程中电场力对其做功和电势能变化情况分别是
动物受到惊吓刺激时兴奋经过反射弧中的传出神经作用于肾上腺髓质使其分泌肾上腺素兴奋还通过传出神经作用于心脏.下列相关叙述错误的是
Nooneknowsexactlyhowmanydisabledpeoplethereareintheworldbutestimatessuggestthefigureisover450million.ThenumberofdisabledpeopleinIndiaaloneisprobablymorethandoublethetotalpopulationofCanada. IntheUnitedKingdomaboutoneintenpeoplehavesomedisability.Disabilityisnotjustsomethingthathappenstootherpeople.Aswegetoldermanyofuswillbecomelessmobilehardofhearingorhavefailingeyesight. Disabilitycantakemanyformsandoccuratanytimeoflife.Somepeoplearebornwithdisabilities.Manyothersbecomedisabledastheygetolder.Therearemanyprogressivediseases.Thelongertimegoesontheworsetheybecome.Somepeoplearedisabledinaccidents.Manyothersmayhaveaperiodofdisabilityintheformofamentalillness.Allarebypeople'sattitudetowardsthem. Disabledpeoplefacemanyphysicalbarriers.Nexttimeyougoshoppingortoworkorvisitfriendsimaginehowyouwouldmanageifyoucouldnotgetupstepsorontobusesandtrains.Howwouldyoucopeifyoucouldnotseewhereyouweregoingorcouldnothearthetraffic?Butthereareotherbarriers:prejudicecanbeevenhardertobreakdownandunavoidablyrepresentsbyfarthegreatestbarrierofall.Itisalmostimpossiblefortheable﹣bodiedtofullyappreciatewhatthedisabledgothroughsoitisimportanttodrawattentiontothesebarriersandshowthatitistheindividualpersonandtheirabilitynottheirdisabilitywhichcounts. 1.Thefirstparagraphpointsoutthat. A.itispossibletogetanexactfigureoftheworld'sdisabledpeople B.therearemanydisabledpeopleintheworld C.thenumberofdisabledpeopleinIndiaisthegreatest D.IndiahasnotmuchmoredisabledpeoplethanCanada 2.ThekeywordinParagraph4is. A.barriers B.ignorance C.disability D.prejudice 3.Thelastwordofthepassagecountsmostprobablymeans. A.ismostimportant B.isincluded C.isconsidered D.isnumbered 4.WhichofthefollowingstatementsisNOTtrueaccordingtothepassage? A.eventheable﹣bodiedmaybecomedisabledinsomeway B.thedisabledprefertobeignoredbytheable﹣bodied C.prejudiceagainstthedisabledshouldberemoved D.Thedisabledmakeupabout10percentintheUK'spopulation 5.Itcanbeconcludedfromthepassagethat. A.weshouldtryourbesttopreventdisability B.wemusttakeaproperattitudetowardsthedisabled C.theable﹣bodiedpeoplewillneverfullyunderstandthedisabled D.bothphysicalandmentalbarriersarehardtobreakdown.
如图为神经系统内分泌系统与免疫系统之间相互关系的样例示意图据图回答. 1神经系统内分泌系统与免疫系统之间的信息分子存在着填“单向”或“双向”调节作用.图中神经系统内分泌系统免疫系统各自产生的信息分子分别是填序号和免疫活性物质可直接与靶细胞细胞膜表面的结合. 2焦虑紧张等应激刺激使下丘脑分泌的激素含量升高最终导致血液中肾上腺糖皮质激素的浓度使免疫功能受抑制因此肾上腺糖皮质激素可以用于以下填字母的治疗 a.系统性红斑狼疮b.艾滋病c.过敏反应d.器官移植e.先天性胸腺发育不良 3三大系统相互配合借助信息分子相互作用构成了调节网络共同维持内环境的稳态.例如成年人甲状腺激素分泌过量会使神经系统的加强.
Therearemomentsinlifewhenyoumisssomeonesomuchthatyoujustwanttopickthemfromyourdreamsandhugthemforreal!Dream1youwanttodreambecauseyouhaveonlyonelifetodoallthethingsyouwanttodo. Mayyouhaveenoughhappinesstomakeyousweetandenoughtrialstomakeyoustrong?Alwaysput2inothers'shoes.Ifyoufeelthatithurtsyouitprobablyhurtstheotherpersontoo. Thehappiestofpeopledon't3necessaryhavethebestofeverything.Theyjustmakethemostofeverything4comesalongtheirway.Happinessliesforthosewho5searchandthosewhohavetriedforonlytheycanappreciatetheimportanceofpeoplewhohavetouchedtheirlives.Lovebeginswithasmilegrowswithakissandends6atear.Thebrightestfuturewillalwaysbebasedon7forgottenpast.Youcan'tgoonwellinlife8youletgoofyourpastfailuresandheartaches. Whenyouwerebornyouwerecryingandyourfamilywerearoundyou9smile.Liveyourlifesothatwhenyoudieyou'rethe10whoissmilingandeveryonearoundyouiscrying. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
你在本地报纸上读到对健身教练Michael的采访请你用英语向班里的同学介绍这篇报道的内容. 【写作内容】 【写作要求】 1.只能使用5个句子表达全部内容; 2.作文中不能出现真实姓名和学校名称. 【评分标准】 句子结构准确信息内容完整篇章结构连贯. .
某实验室保存有野生型和一些突变型果蝇.果蝇的部分隐性突变基因及其在染色体上的位置如图所示.回答下列问题. 1同学甲用翅外展粗糙眼果蝇与野生型正常翅正常眼纯合子果蝇进行杂交F2中翅外展正常眼个体出现的概率为.图中所列基因中不能与翅外展基因进行自由组合的是. 2同学乙用焦刚毛白眼雄蝇与野生型直刚毛红眼纯合子雌蝇进行杂交正交则子代雄蝇中焦刚毛个体出现的概率为若进行反交子代中白眼个体出现的概率为. 3为了验证遗传规律同学丙让白眼黑檀体雄果蝇与野生型红眼灰体纯合子雌果蝇进行杂交得到F1F1相互交配得到F2.那么在所得实验结果中能够验证自由组合定律的F1表现型是F2表现型及其分离比是验证伴性遗传时应分析的相对性状是能够验证伴性遗传的F2表现型及其分离比是.
某实验小组用细菌甲异养生物作为材料来探究不同条件下种群增长的特点设计了三个实验组每组接种相同数量的细菌甲后进行培养培养过程中定时更新培养基三组的更新时间间隔分别为3h10h23h得到abc三条种群增长曲线如图所示.下列叙述错误的是
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