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小代学完电学后惊奇地发现，如图所示的电路图更换不同的元件就可以进行不同的探究实验． （1）在元件处若接上未知定值电阻可以测定未知定值电阻的阻值，其实验原理是： ； （2）在元件处若接上小灯...
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如图所示为某同学在做电学实验时的电路图的一部分根据此电路图你可判断该同学在做的实验
肯定是测定小灯泡的电功率
肯定是测定小灯泡的电阻
肯定是研究串联或并联小灯泡的电流和电压的关系
以上三个均有可能
小英同学在物理实验操作考查中做测量小灯泡的额定功率的实验.图1是该实验是电路图.1请依据图1所示的电
2.00分小丽用伏安法测量标有2.5V0.5A的小灯泡L的电功率她正确连接如图所示实物电路后闭合开
某同学测小灯泡电阻的电路如图5所示其中电源电压为4.5V他按电路图正确连接好实验电路并检查各元件完好
小代学完电学后惊奇地发现如图所示的电路图更换不同的元件就可以进行不同的探究实验． 1在元件处若接
小红同学在做测量小灯泡的额定功率实验时连接的实物电路图如图甲所示.其中小灯泡的额定电压为2.0V额定
某班在进行测定小灯泡阻值的实验中⑴某小组根据已有器材连接了实物电路如图所示请根据实物连接图在框内画出
如图所示是某实验小组选用的测定小灯泡电功率所需要的电路元件.小灯泡的额定电压为3.8V估计小灯泡的阻
RLC三个元件串联的电路图如图所示
小森家有两盏墙壁灯由一个开关控制其元件符号如图所示试将其连接成电路图
小红同学在做测量小灯泡的额定功率实验时连接的实物电路图如图所示其中小灯泡的额定电压为3.0V额定功率
小丽用伏安法测量标有2.5V0.5A的小灯泡L.的电功率她正确连接如图所示实物电路后闭合开关S.发现
在电学实验中物理实验小组的同学们按照甲图所示电路图连接好电路想同时完成电学的多个实验已知电源电压为6
某班在进行测定小灯泡阻值的实验中⑴某小组根据已有器材连接了实物电路如图所示请根据实物连接图在框内画出
小希在测额定电压为2.5V的小灯泡电阻时设计了如图甲所示的电路图.1实验时小希按电路图连接了电路闭合
如图所示是某实验小组选用的测定小灯泡电功率所需要的电路元件.小灯泡的额定电压为3.8V估计小灯泡的阻
如图所示请把图中的电学元件连接成电路图要求S1只控制L1S2控制干路
有一电学元件检测仪内部电路由电源电阻和连接导线组成M.N.是它在检测元件时所用的两个接线头如图所示.
某同学测小灯泡电阻的电路如图所示其中电源电压为4.5V他按电路图正确连接好实验电路并检查各元件完好然
小丽用伏安法测量标有2.5V0.5A的小灯泡L的电功率她正确连接如图所示实物电路后闭合开关S发现小
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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. Highschoolisatimewhichwemaymeetmanygoodteachers.WhenIwasinSeniorOneImetmychemistryteachercallingJohnwhodevotedhimselfinteaching.Hetriedhisbesttomakeherclasseslively.Heusuallymadegoodpreparationsforthelessonsandwasstrictwithustoo.Wheneverwemademistakesinourhomeworkhewouldaskustocorrectingthem.Iwasusedtobepoorinchemistry.Heoftenhelpsmewithmystudiesverypatient.BecauseofhishelpImaderapidprogressesandcaughtupwiththeclass.Hewasalwaysverykindtoeverystudent.Asexperiencedteacherhewasrespectedandlovedbyallthestudents.
人体内环境稳态是机体进行正常生命活动的必要条件．神经﹣体液﹣免疫调节网络是机体维持稳态的主要调节机制．下列相关的叙述中正确的有几项 ①细胞内液血浆组织液和淋巴共同构成了机体内细胞生活的直接环境 ②神经调节的基本活动方式是反射完成反射的结构基础是神经元兴奋一般是从一个神经元的轴突传至另一神经元的树突或胞体 ③激素是通过体液的传输作用于靶细胞或靶器官的信息分子 ④血糖的平衡调节是通过体液调节完成的 ⑤恒温动物维持体温的恒定是通过神经调节完成了体内产热量和散热量平衡的过程 ⑥体液免疫过程中有吞噬细胞参与的阶段有两次．
从abc中任取两个字母排成一列则不同的排列种数为
假如你是高二学生李华你的英国好友John邀请你这个暑假去伦敦旅游但你暑假有学习计划不能前往请你写一封信.要点如下 1.表达遗憾 2.说明理由 3.希望有机会再去. 注意1.可以适当补充细节以使行文连贯 2.词数80左右.
AlabamaPriester'sPecans DessertintheSouthbasicallystartsandendswithanooey﹣gooeypecan核桃pie.EspeciallyinAlabamawherethepecanistheofficialstatenut.WhilethereareplentyoffarmsthatpickandpackagepecansperhapsthemostfamousisPriester'safamily﹣runbusinessthat'sbeensupplyingAlabamawithitsfavoritenutsforoversevendecades. AlaskaSalmonjerky Forgetbeefjerky肉干﹣inAlaskait'sallaboutthesalmonjerky.Hometofivedifferentspeciesoftheflavorfulfishkingredpinksilverandchumthenorthernmoststateproducesnearlyone﹣thirdofthewildsalmonconsumedaroundtheworld.BonusSalmonisoneofthesevenhealthiestfishyoucaneat. ArizonaSaguarocactus Thelargestcactus仙人掌intheUnitedStatesthesaguarocactusisfoundonlyinArizona'sSonoranDesert.Livingtobeupto200yearsoldthecactiwhoseflowerisalsothestate'sfloweraregenerallyaround30feettallandcangrowunlimitedarms.Wanttoseeforyourself?Visitoneofthese10outstandingdesertescapesinAmerica. CaliforniaWineGuide Itisn'tcalledWineCountryfornoreason.NorthernCaliforniaspecificallyNapaValleyandSonomaValleyproduceover60000registeredwinelabelsmakingvino酒类产品thestate'smostvaluableagriculturalproduct.Ifyou'relookingforthemostpopularvarietals优质酿酒葡萄汁thetoptwofrequentlyplantedgrapesarechardonnayandcabernetsauvignon. 1HowlonghasthePriester'sfarmlasted? A.About7years. B.About30years. C.About70years. D.About200years. 2Whichstateisfamousforsalmon? A.Alaska. B.Arizona. C.Alabama. D.California. 3Wheredoesthetextprobablycomefrom? A.Alibraryguide. B.Anewsreport. C.Aprojecthandbook. D.Atravelguide.
Onenight1winterabearcameintothecityinVancouverCanada.Itwalkedthroughthecitystreetspasthousesshopsandoffices.Thenit2findsomefoodinbinsoutsidearestaurantandstartedeating.Inthemorning.someonesawthebearandcalledthepolice.Thepolicecamewithavet兽医fromthecityzoo.Theyputthebearinalorryandtookittothemountainsoutsidethecity3luckythebearwassafe.But4happensinothercountrieswhenbiganimalscomeintocities?InVancouveritisunusual5seeabearbutinsomecitiesyoucanseebiganimalsonthecitystreetseveryday.Biganimalsusuallycomeintocitiestofindfood.InCapeTowninSouthAfricababoons狒狒comeintothecitywhentheyare6hunger.Humanfoodisverybadforthebaboons7toothbecauseithasalotofsugar.NowthereareBaboonMonitorsworkinginCapeTown.8theyjobistofindbaboonsinthecityandreturnthemtothecountryside.InBerlininGermanypigssometimescomeintothecityforfood.Theyeatflowersandplantsinparksandgardens.Sometimestheyeatvegetablesfromgardens9theywalkinthestreetcausingaccidents.Somepeoplelikethepigsandtheygivethemfoodandwatertodrink.Otherpeopledonotlikethepigsandtheywantthegovernmentandthepolicetostopthem10enterthecity.
Travelingbysubwaycansometimesbequiteanadventureespeciallyduringrushhour.Therearethetimeswhenyouhavetoavoidcupsofcoffeethatcouldspill溅onyou.Thesmellsofsomepassengers'foodareverystrongtoo.AccordingtotheBeijingsubwaypassengerregulationswhichwentintoeffectonMay15thpassengersexceptbabiesandthesickarenolongerallowedtoeatordrinkonthesubway.Violators违反者whodonotstopafterbeingaskedtowillbeaskedtogetoff.Theviolationwillalsoberecordedintheviolators'creditrecord Somesupporttherule.Thereasonisthatthesmelloffoodanddrinkcanannoyotherpassengers.ThesmelloffoodfillsthecarriagecausingpeoplediscomfortespeciallyinthehotsummerBesideseatingonthesubwayproducesrubbish.AndonsubwaytrainspeopleoftenspilltheirdrinkssaidZhengYiou17astudentfromHefei. Howeverothersquestionthisrule.Somecitizenslivesofarfromtheirworkplacesthattheyhavelimitedtimetohavebreakfastbeforetheygotowork.EatingwhiletheytravelsavesthemtimeanddecreasesthechancethattheywillbelateforworkHeSonglina17﹣year﹣oldstudentfromChengdusaidAndsomepeoplelikethosewithlow﹣bloodsugarlevelsgetsickiftheycan'teatwhentheymust. OtherChinesecitieslikeNanjingandChengduhavesimilarregulations.Someforeigncitiesalsobaneatinganddrinkingonthesubway.ForexampleeatinganddrinkinghavelongbeenbannedonthesubwayinWashingtonDC.Singaporefinespeoplewhoeatordrinkonthesubwayupto500SingaporedollarswhichisRMB2417yuan. ChenYanyanaprofessorfromBeijingUniversityofTechnologybelievedweshouldconsidertheneedofsomepeopletoeatordrinkonthesubway.Commuters上班族andtravelersaresometimestoobusytoeat.MaybewecouldlearnfromTokyowheretherearemanysubwaystationsequippedwithservicesallowingpassengerstoeatanddrinkshesaid. 1InwhichcitywassubwaypassengerregulationscarriedoutonMay15th? A.Chengdu. B.Nanjing. C.WashingtonDC. D.Beijing. 2What'sthepunishmentforthepassengerswhobreaktherulesinSingapore? A.Eatingonthesubway. B.Drinkingonthesubway. C.Beingfinedupto2417yuan. D.Beingaskedtogetoffthetrain. 3WhatisChenYanyan'sattitudetoeatingordrinkingonthesubway? A.Worried. B.Sympathetic. C.Doubtful. D.Uninterested 4Whatwouldbethebesttitleforthetext? A.FoodandDrinkBannedonSubway. B.TheAdventureofSubwayTraveling C.WaystoEatandDrinkonSubway. D.TheServicesonSubwayStations
12345中任取2个不同的数事件A＝“取到的2个数之和为偶数”事件B＝“取到的2个数均为偶数”则PB|A等于．
SheriStrailyneverknewhowfarlife'shighwaycouldtakeheruntilherdreamforherchildrenhelpedherfindoutGrowingupSheri1thoughtforamomentthatshe'd2ittocollege.3shetookajobdrivingatractortrailer.4yearspassedSherifellinlovemarriedandhadthreechildren.Becauseshewantedtobeclosetohomeshe5toadeskjobatthetruckingcompany.ButonedayafterworkwhileSheriwas6herkidsplayingshebegantothink'IwantthemtoachievesomuchbuthowcanIaffordtogivethemthe7they'llneedlikecollege?'Thenitcametohershewastheonewhoneeded8first.'9forit'herhusbandencouragedher.SoSherienrolledattheUniversityofDenver'sWomen'sCollege10lethertakeallofherclassesonweekendssoshe11stillwork.ThoughSherilovedher12shemissedhome.Sheriwouldstayathomeonweekends.13makethetwo﹣hourtriptoschool.'IwishIwerehomewithSteveandthe14'she'dthink.ButEriceightRyansevenandKristinfive15theirmomalltheway.'16doyourbest'theysaid.SherididgettingstraightA'sassheentereda17inbusinessadministration.Nowsheis18theUniversityofDenverLawSchoolonameritscholarship.'Ithasn'tbeen19'wroteSheri'butit's20formeandmyfamily.'1A.ever B.just C.never D.even2A.hit B.make C.admit D.have3A.Then B.Therefore C.Instead D.Natuarally4A.Since B.With C.While D.As5A.switched B.returned C.asked D.sought6A.finding B.noticing C.seeing D.watching7A.career B.money C.jobs D.opportunities8A.school B.college C.help D.assistance9A.Go B.Search C.Get D.Come10A.that B.where C.which D.as11A.need B.must C.should D.could12A.teachers B.classmates C.studies D.job13A.Ratherthan B.Otherthan C.Aswellas D.Lessthan14A.husband B.relatives C.parents D.kids15A.opposed B.backed C.agreed D.liked16A.Rarely B.Just C.Still D.Never17A.degree B.work C.job D.interview18A.learning B.attending C.enjoying D.joining19A.difficult B.unusual C.easy D.ordinary20A.rewarding B.interesting C.moving D.demanding
甲乙两人参加一次英语口语考试已知在备选的10道试题中．甲能答对其中的6道乙能答对其中的8道規定每次考试都从备选题中随机抽出3道题进行测试至少答对2道题才算合格则甲乙两人至少有一人考试合格的概率为
研究发现细胞中活化的蛋白质Bak可通过改变线粒体外膜的通透性使线粒体内外膜之面的细胞色素C等小分子物质释放进而激活细胞凋亡信号促使细胞凋亡同时发现在血液肿瘤细胞中通过使用抗癌药物蛋白质Bak活化率可以高达80%．下列描述错误的是
在5件产品中有3件一等品和2件二等品从中任取2件那么以为概率的事件是
已知随机变量X+Y＝8若X～B100.6则EYDY分别是
图甲表示小球藻的某生理过程科学家向小球藻培养液中通入放射性14CO2．在不同条件下连续测量小球藻细胞中14C标记的图甲中三种化合物的相对量其变化曲线如图乙所示．请据图回答下列问题． 1图甲所示生理过程发生在中若要使该过程持续稳定地进行必须由光反应持续提供和． 2图乙曲线abc分别表示图甲中化合物和相对量的变化． 3参照图甲分析出现图乙a曲线的原因是条件下小球藻吸收培养液中14CO2并逐渐合成使其上升突然停止该条件的处理光合作用的反应减弱不能继续被还原14CO2继续被固定使其再次上升．
Travelingwithkidsregardlessoftheageisaterriblethingfornewparents.Responsibilityishighandtravelexpensesmightbeunexpectedatanypointofthetrip.Ifyouareplanningyourfirstroadtriporvacationwithchildrenthereareseveralimportantthingstoconsider.Getachildlocator.1andmanyparentssometimeslosetheirkidsPopulartouristdestinationsareovercrowdedtoo.Soifyouareafraidoflosingyourchildrengetachildlocatortobeawareofwhereyourkidsaregoingwhentheyaccidentallygetlost.2Youdonotneedtopacktonsoftoyssweetsandatabletfullofgamesinordertokeepyourlittleonesentrained.Youcanencouragethemtocreateatraveljournalorsmashbookreadtelleachotherstoriesorgivethemacameratocapturethemostpreciousmomentsduringyourtrip.34Thisisamustevenduringtheshortestroadtrip.Youcanhandleaheadachebutyourchildcan't.Ifyoudonotknowwhattoputinyourfirstaidkit急救箱.consultyourchildren'sdoctorbecauseallchildrenaredifferentandthemedicineseither.Apartfromtheabovemoneypassportavoidingheavyluggagepickafamily﹣friendlydestinationandfamilyfriendlyaccommodationarealsoneeded.Travelingwithkidsisexcitingandinteresting.Yourfirsttripmightnotbesoexcitingbutwithacarefulpreparationyourfamilytripwillbethemostmemorableone.5A.KeepthemcarefulB.KeepthementertainedC.Packasmallkid﹣friendlyfirstaidkit.D.BoardgamesmightbeagodchoicetooE.Airportsandtrainstationsareusuallyovercrowded.F.Avoidingyourlittleonesinthepanningofthetripisagoodidea.G.Involveyourlittleonesintheplanningofthetripwhichwillhelpyou
PM2.5是指悬浮在空气中的空气动力学当量直径小于或等于2.5微米的颗粒物也称为可入肺颗粒物根据现行国家标准GB3095﹣2012PM2.5日均值在35微克/立方米以下空气质量为一级在35微克/立方米～75毫克/立方米之间空气质量为二级在75微克/立方米以上空气质量为超标．从某自然保护区2012年全年每天的PM2.5监测值数据中随机地抽取10天的数据作为样本监测值频数如表所示 1从这10天的PM2.5日均值监测数据中随机抽取3天求恰有1天空气质量达到一级的概率 2从这10天的数据中任取3天数据记ξ表示抽到PM2.5监测数据超标的天数求ξ的分布列 3以这10天的PM2.5日均值来估计一年的空气质量状况则一年按366天算中平均有多少天的空气质量达到一级或二级．精确到整数
OnMarch252010KateandDavidOggheardthewordseveryparentdreadsTheirnewbornwasn'tgoingtomakeit.Theirtwins﹣﹣agirlandaboy﹣﹣wereborn14weeksprematureweighingjustovertwopoundseach.Doctorshadtriedtosavetheboyfor20minutesbutsawnoimprovement.Hisheartbeatwasnearlygoneandhe'dstoppedbreathing.Thebabyhadjustmomentstolive. IsawhimgaspbutthedoctorsaiditwasnouseKatesaid.Iknowitsoundsstupidbutifhewasstillgaspingthatwasasignoflife.Iwasn'tgoingtogiveupeasily. Stillthecoupleknewthiswaslikelygoodbye.InanefforttocherishherlastminuteswiththetinyboyKateaskedtoholdhim. IwantedtomeethimandforhimtoknowusKatesaid.We'dresignedourselvestothefactthatweweregoingtolosehimandwewerejusttryingtomakethemostofthoselastpreciousmoments. KateunwrappedtheboywhomthecouplehadalreadynamedJamiefromhishospitalblanketandorderedDavidtotakehisshirtoffandjointheminbed.Thefirst﹣timeparentswantedtheirsontobeaswarmaspossibleandhopedtheskin﹣to﹣skincontactwouldimprovehiscondition.Theyalsotalkedtohim. WeweretryingtohavehimKatesaid.Weexplainedhisnameandthathehadatwinandhowhardwehadtriedtohavehim. Thensomethingmiraculoushappened.Jamiegaspedagain﹣﹣andthenhestartedbreathing.Finallyhereachedforhisfather'sfinger.Thecouple'slostboyhadmadeit. EightyearslaterJamieandhissisterEmilyarehappyandhealthy. 1FromwhatcanwetellthatJamiewasstillalive? A.Hisheartbeat. B.Hispulse. C.Hisgasp. D.Hisunderweight. 2Whydidtheparentsliewiththebabyboyinonebed? A.Thefamilywantedtostaytogetherandkeepwarm. B.Thefamilywantedtohavetheirprivatespace. C.Theparentsweresotiredandwantedtorest. D.TheparentswantedtospendthelastminuteswithJamie. 3Whatcanbethebesttitleforthepassage? A.PrematureTwins B.Life﹣givingTouch C.First﹣timeParents D.LastPreciousMoments
从5名男生和4名女生中选出3名学生参加一项活动要求至少一名女生参加不同的选法种数是
DuringmymiddleschoolyearsIwasveryallergictoEnglishgrammar.1thetwoincidentsI2laterchangedmyviewaboutlearningEnglish.3IthinkitisreallyfuntolearnEnglishgrammar.ItoccurredwhileIwas4inthemysteriousworldofiPhone.MyEnglishteacherwrotetwosentencesonthe51Thekingwouldwearnoclotheswhichmakehimappeardifferentlyfromothers.2Thekingwouldwearnoclotheswhichmakehimappeardifferentlyfromothers.Glancingatthetwo6Ithoughttheteachermusthavemadeamistake7thesetwosentenceswerethesame.Suddenlytheclassburstintoaloudlaughter.OnlythendidI8thataddingacommacouldshowabigdifferencein9.Afterwardsomething10happenedtome11.AtthebeginningofmyEnglishclassonedaytheteacher12ourhomeworkassignment.Tomy13myteacherhad14out﹣lyinthesentence‘IstudiedEnglishhardly'.'Isn't‘hardly'anadverb?'Iaskedmyself.LaterofcourseI15whatwaswrong.Iwasassumingeveryadjectiveaddedwith﹣lystill16themeaningofthatadjective.NottillthendidIfindoutthat‘hardly'17meant‘almostnot'sowhatIhad18madeaworldofdifferencefromwhatIwantedtosay.InconclusionwhatIexperiencedenablesmeto19Englishistrulyamysteriousworldofart.What20itistolearnEnglishgrammar!1A.However B.Besides C.Therefore D.Instead2A.witnessed B.heard C.experienced D.described3A.Then B.Soon C.Now D.Later4A.shocked B.absorbed C.rooted D.trapped5A.phone B.door C.window D.blackboard6A.sentences B.words C.phrases D.questions7A.whether B.because C.when D.if8A.ask B.wish C.realize D.hope9A.life B.form C.time D.meaning10A.interesting B.exciting C.strange D.awkward11A.before B.together C.yet D.again12A.checked B.returned C.found D.finished13A.disappointment B.joy C.surprise D.relief14A.handed B.worked C.carried D.crossed15A.figuredout B.gaveaway C.searchedfor D.talkedabout16A.creates B.hides C.explains D.keeps17A.finally B.gradually C.actually D.frequently18A.written B.known C.said D.seen19A.expect B.understand C.respond D.introduce20A.trouble B.fun C.difference D.magic
已知5x﹣n． Ⅰ当n＝6时求 ①展开式中的中间一项 ②展开式中常数项的值． Ⅱ若展开式中各项系数之和比各二项式系数之和大于240求展开式中含x项的系数．
在基因型为AaXBXbAaXBY的果蝇产生正常配子过程中下列叙述错误的是
ItwasaFridaynightandIwas1arestaurantwashingdishes.Aplate2throughmywetfingersandfellontothefloorin3.Myfaceflushed发红andinsideIwasscreaming'Whyme!?'asifmy4wouldmaketheplatewholeagain.Thebrokenplatewasonlyoneofthemany5fightinginsideme.Therewereadozen6smallerbuturgentconcerns.Formeitwasimpossibletogetsomemuch7restorsomestudytimebeforeacomingexam.Ihadto8withthefamilyexpenses开销.SoIgotbacktowork.Itwas12a.m.whenIfinallyfinishedmywork.Igotonthe9homeandtookoutmynotestostudy.Igotthe10looksfrompeopleoutofbarsbecauseIwasstudyingonabusinthemiddleofthenight.Their11didn'tbothermeatall.Iknewsomethinghadtochangeinmyfamilyandit12tometobeginit.FortunatelyIalsoknewIhaddesireand13inmyblood.MygrandfatherwasamongthefirstMexicanimmigrantswho14inL.A..BothofmyparentsleftMexicointheirearlyteenageyearsandbeganworkinglong15asacookandamaid.Thespiritwas16generationswhichhelpedmebothinschoolandatwork.AsIwalkedthroughthefrontdoorathomeIsawmymotherhadfallenasleep17medespiteherownlongday.Inmybedroomwatchingmybrothersbreatheslowlymademefeelmybody'stiredness.HoweveritwouldbeawhilebeforeIcould18theminsleep.Ihadanessay19earlythenextmorningandMs.DePaolodoesn't20latework.1A.inthemiddleof B.inthefrontof C.inthecornerof D.inthebackof2A.slipped B.flew C.jumped D.slowed3A.slices B.pieces C.blocks D.sheets4A.scream B.cry C.voice D.shout5A.tasks B.difficulties C.worries D.matters6A.another B.others C.other D.some7A.excited B.attracted C.delayed D.needed8A.increase B.workout C.cutdown D.helpout9A.taxi B.bus C.subway D.train10A.strange B.casual C.friendly D.formal11A.observation B.stares C.laughter D.ignorance12A.felt B.jumped C.threw D.fell13A.promise B.wish C.courage D.ability14A.settled B.moved C.lived D.worked15A.years B.days C.hours D.minutes16A.handedin B.passeddown C.passedaway D.turnedto17A.waitingfor B.watchingon C.callingup D.searchingfor18A.take B.join C.hold D.keep19A.ready B.written C.due D.finished20A.receive B.check C.accept D.assess
某种产脂肪酶菌常被用作饲料添加剂如表是从土壤中初筛该菌的培养基配方请回答下列问题 1在上述培养基中榄油能为产脂肪酶菌提供．为增大产脂肪酶菌的浓度需用该培养基进行富集培养富集培养基宜选用液体培养基的原因是． 2用涂布平板法分离产脂肪酶菌时在上述培养基的基础上还应加入和溴甲酚紫碱性条件下呈紫色在酸性条件下为黄色．在平板上产脂肪酶菌菌落的周围会出现黄色圈原理是．筛选时常选择菌落大黄色圈直径大的菌落这说明此菌落． 3菌落是指由一个细胞繁殖而来的肉眼可见的子细胞群体．在平板上有的菌落较小呈乳白色表面光滑无丝状物这些菌落可能为填“细菌”或“霉菌”．有的菌落连成一片形成原因最可能是． 4研究发现在饲料中添加产脂肪酶菌剂后动物的体重明显增加这说明．
Inmostartmuseumsthepaintingsonthewalljustlookflatbutsometimesvisitorscomeacrossanimagethatappearstobethree﹣dimensional.Theartisthascleverlyusedcolorslinesandshadingtogivethepaintingsomedepthmakingitmorerealistic.Theartistictechniqueofcreatingthree﹣dimensionalimagesofsomethingonaflatsurfaceiscalledtrompeI'oeil.TodaysomeartistsareadaptingtheideaoftrompeI'oeiltomakethingsbecomeinvisiblewhichiscalledcamouflageart. Innatureusingcamouflagenotonlyallowsinsectsandanimalstohidefromtheirnaturalenemiesbutalsoallowsthemtogetcloseenoughtosurpriseotherinsectsorsmalleranimalsthattheywanttocatchandeat.Artistsarenothidingorpreparingtoattack.Insteadtheyareusingtheideaofcamouflagetomakeurbanspaceslooknicerortomakestatementswiththeirart. Itisnotdifficulttofindthingsthatwewouldliketomakedisappearsuchasthedullwallofalargeindustrialbuildingorthepolescarryingelectricitywires.Artistscanmakethesethingsmoreinterestingandinsomecaseslessvisible.Inmanyurbanareaslargebuildingshavebeenpaintedwithamazingpicturesthattrickoureyes.Thusordinarybrickwallsaretransformedintointerestingworksofart. Someartistsincludecamouflageintheirworktosaysomethingaboutthemodernworldwelivein.ForexampleAmericanartistTrinaMerrycamouflagespeoplesothattheydisappearinthelandscapesshe photographs.HerlatestseriesNewYorkCityblends融合womenandtheirenvironmenttocreateimagesthatcloselyexaminetherelationshipbetweenpeopleandwheretheylive.MyseriesshowsrespectforBigApplewomenwhofeeltheneedtoblendinwitheveryoneelseinNewYorkMerrysays.Ithinkmanywomenmoveherehopingtoliveacitylifewhentherealityisthatmostwomenhavetochangetheirfancydesignerheelsonthesubwayformorepracticalsneakers. 1Whichofthefollowingwordsbestdescribecamouflageart? A.Flat. B.Invisible. C.Dull. D.Disappointing. 2Whatisthepurposeofusingcamouflageinnature? A.Tomakeanimalslooknicer. B.Toexpresspeople'sartisticconcept. C.Tosurprisesmalleranimalsorinsects. D.Toprotectanimalsfromnaturalenemies. 3Fromthelastparagraphweknowthat. A.Merryfeeltheneedtofitinwithothersinthecity B.mostwomenwearfancydressesintheirdailylifeinthecity C.womeninNewYorkhavesucceededinbeingapartofthecity D.NewYorkcitycanpartlymirrorpeople'slifeinmodernsociety 4Thisarticleismainlyabout. A.aformofart B.theseriesofpaintings C.afamousartist D.thewomeninNewYork
Iwillneverforgetthedarknessthepainandstrongdesiretodie. NovemberarrivedgreyandbusyandgoingintoanevenmorestressfulDecemberIwasfilledwithanxiousthoughts.Avisittomyfather'sgraveisoftenagoodchancetocryandwhenIleaveIfeelalittle moreatpeace.Butthistimewasdifferent.IdrovehomeandeverynightfortherestofthatweekIcried. OnSaturdayIwatchedaTVprogramteachingbakingandthenIstartedtolearn.BytheendoftheweekendIhadatablecoveredwithsweettreats.Ipackagedthemupintinsattachedalabeltoeachofthemwithwinterloveonitanddroppedthemoffonafewofmyneighbors'porches.Itshockedmehowmuchitlightenedmymoodseeingasmallpackagelostonaporch.ThethanksIreceivedlaterfromtheneighborsmademelightup.Itfeltsogoodanditdistractedmefrommydarkthoughts. ByJanuaryIhaddevelopedaroutineonSundayI'dbakecookiesandpackagethemupandonMondayI'ddeliverthem.EveryweekIaddedafewdifferentpeopletomydeliveryroute.Thenthingsstartedshowinguponmydoorstep﹣ahomemadecupapairofsockswithcookiesandevenagiftcertificatefromthelocalbookstore.Everysingleonemeltedmyheart.ButwhatIreallyappreciatedwashowpeoplebegantosharetheirownstoriesofmentalhealthwithme.Thereisnogreaterhonorthantobetrustedwithanother'slife.Iwasoverwhelmedbytheloveandcareofmycommunity.Ithumbledmethatsomethingsosimplehadcreatedsuchincrediblekindness. Iwasshiftingintoanewseasonoflightwhilelettinggoofaseasonofdarkness.Itremindedmethatthereisbeautyinbeingkindandthatlifeistoughbutthereisaquietstrengthinknowingyouarenotalone. 1Whatcanweknowabouttheauthorfromthefirsttwoparagraphs? A.Shefeltlifewastoopainfultolive. B.Shewasinabadphysicalcondition. C.Shewasstressedduetoherfather'sdeath. D.Sherecoveredaftervisitingherfather'sgrave. 2Aftershestartedsharingcookieswithneighborstheauthor. A.gainedtrustandcarefromthem B.addedotherthingstoherdeliverylist C.feltherlifewasnolongerbusyorstressful D.foundsomeofthemhadmorementalproblemsthanher 3Whatisthemainpurposeofthispassage? A.Toexpressgratitudetocaringneighbors. B.Tosharehowbeingkindhelpedherregainhope. C.Tospeakofthebenefitsofbakingcookiesathome. D.Toshowtheimportanceofatrustedcommunity.
某英文报社正在开展环保大讨论向你约稿.请以垃圾分类为主题按照以下要点发表你的观点 1.意义 2.现状 3.建议 注意1.词数100左右 2.文章标题已拟好不计入总次数. 3.参考词汇垃圾分类garbageclassification OnGarbageClassification Yours LiHua
某省实行高考改革考生除参加语文数学英语统一考试外还需从物理化学生物政治历史地理6科中选考3科．学生甲想报考某高校的医学专业．就必须要从物理生物攻治3科中至少选1科则学生甲的选考方法种数为用数字作答
如图为人体下丘脑参与的部分调节过程示意图．回答下列问题 1人在寒冷环境中下丘脑神经分泌细胞分泌的激素A是激素B只能作用于甲状腺细胞的原因是．甲状腺激素在人体中的作用是． 2若图中“下丘脑→激素A→垂体→激素B”过程调节着人体内性腺分泌性激素某人下丘脑功能正常但性激素含量不足原因是垂体或性腺两种器官中的某一器官功能受损．临床上可通过给患者注射激素填“A”或“B”然后检测血液中性激素的含量变化进行诊断若则说明垂体功能受损．
假如你是李华你约好昨天去公交车站接你的朋友Dylan但你却迟到了10分钟令他很失望.请用英语给他写一封道歉信要点如下 1.向他表示道歉2.表达你对此事的认识3.请求他的原谅. 注意1.词数80左右 2.可以适当增加细节以使行文连贯 3.开头和结尾已为你写好不计入总词数. DearDylan Yours LiHua
In2013Tallinn爱沙尼亚首都塔林becametheworld'sfirstcapitalcitytoofferpeoplefreepublictransport.LastyearEstonia爱沙尼亚settheaimtobecomethefirstcountrywithfreepublictransportnationwide.Busesarenowfreeofchargein11ofits15counties. Tallinn'scitygovernmentcameupwiththeideaoffreetransportin2008.Eventhoughthecitypaidmorethan70%ofpublic﹣transportcoststicketpriceswerestilltoohighforpoorerpeople.Crowdednesshadalsobecomeaproblem.Since1991thenumberofpeopleowningcarshasdoubled. Opponents反对者thoughttheideaunaffordableandcritics批评者predictedthetransportsystemwouldbecomeovercrowdedandlackmoney. Surprisinglypublictransporthasimproveddespitea€12millionhittothesystem'sfinancesfromlostticketsales.Tallinn'spopulationhasgrownleadingtoanincreaseinlocaltaxintake.Additionalrevenue财政收入comesfromtouristswhostillhavetobuytickets.TheuseofpublictransportinTallinnhasgoneupby10%whilethenumberofcarsinthecityhasgonedownby10%meaninglesscongestion. NowothercountriesarelookingatEstonia'sexperience.TallinnofficialssaytheyhavehadinterestfromFranceSwedenPolandItalyandGermany.Otherplaceshavealreadyintroducedfreepublictransportforcertaingroupsoratcertaintimes.InEngland1/3ofallbustripsarefare﹣freeespeciallyforpensioners领养老金者Walesrunsfreetravelatweekendstoimprovetourism.Butsofarfullfare﹣freetravelisrare.ThecityofHasseltinBelgiumranfreepublictransportfor16yearsbeforereintroducingfaresbecauseofincreasingcosts. 1Whichofthefollowingplacesoffersfullfare﹣freepublictransport? A.Hasselt B.Estonia C.Wales D.Tallinn 2WhatideadidtheopponentsandcriticsshareaboutTallinn'sfreepublictransport? A.Thegovernmentwouldn'thaveenoughmoneytocarryitout. B.Itwouldn'thelpwiththecity'sovercrowdedness. C.Itwouldleadtotheheavylossfromticketsales. D.Yearslaterthecitywouldreintroducefaresfrompeople. 3Whatdoestheunderlinedwordinparagraph4mean? A.pollution B.population C.crowdedness D.income 4WhydoyouthinksomanycountriesshowinterestinEstonia'sexperience? A.Itoffersmorejobopportunitiesforpeople. B.Ithelpstosolvethetrafficproblemincities. C.Itencouragespeopletostopdriving. D.Itattractsmoretouriststotakebuses.
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