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水是一种重要的资源． （1）自来水厂净水常用到活性炭，其作用是 ． （2）海水淡化可缓解淡水资源匮乏的问题．如图是采用膜分离技术的反渗透法海水淡化装置，对海水加压后只有水分子可以通过淡化膜，...
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如图是自来水厂净水过程示意图请根据图示回答下列问题1自来水厂生产自来水未使用的净水方法有______
人类的生活和工农业生产都离不开水下图是自来水厂净水过程示意图请回答下列问题1自来水厂生产自来水时使用
水是一种重要的资源．自来水厂净水过程中用到活性炭其作用是．
如图是自来水厂净水过程示意图请根据图示回答下列问题1自来水厂生产自来水未使用的净水方法有______
1自来水厂净水过程中常用活性炭活性炭的主要作用是2生活中可以用鉴别自来水是不是硬水
自来水厂净水流程为天然水→沉降→过滤→吸附→自来水其中常用作除去臭味的试剂是
漂白粉
活性炭
氯气
明矾
自来水厂净水流程为天然水――沉降――过滤――吸附――自来水常用除臭味的试剂是
漂白粉
活性炭
氯气
明矾
水是一种重要的资源1指出右图电解水实验的目的是_________2该反应的方程式为3自来水厂净水过程
自来水厂净水流程为天然水→沉降→过滤→吸附→自来水其中常用作除去臭味的试剂是
漂白粉
明矾
氯气
活性炭
下图是自来水厂净水过程示意图1自来水厂采用哪些净水方法2加入絮凝剂明矾的作用是什么3活性炭吸附池的作
水是一种重要的资源．自来水厂净水过程中用到活性炭其作用是．
自来水厂净水流程为天然水→沉降→过滤→吸附→自来水其中常用作除去臭味的试剂是
漂白粉
活性炭
氯气
明矾
水是一种重要的资源1自来水厂净水过程中用到活性炭其主要作用是2生活中常用来区分硬水和软水3电解水实验
自来水厂净水过程中用到活性炭其作用是________高铁酸钾K2FeO4是一种集消毒吸附絮凝于一体的
自来水厂会使用到活性炭的净水环节是
过滤
吸附
沉降
消毒
自来水厂净水流程为天然水→混凝池加入消毒剂和凝聚剂→沉淀池→砂滤池→自来水混凝池中加入的凝聚剂是
氯气
活性炭
漂白粉
明矾
自来水厂净水流程为天然水→沉降→过滤→吸附→自来水其中常用作除去臭味的试剂是
漂白粉
活性炭
氯气
明矾
水是一种重要的资源⑴电解水实验揭示了水的组成右图实验中得到氧气的试管是__________填1或2⑵
水是一种重要的资源.1电解水实验揭示了水的组成.如图中试管2得到的气体是.2自来水厂净水过程中用到活
某自来水厂用源水处理成自来水的流程如下1加入活性炭的作用是在乡村没有活性炭常加入来净水2实验室中静置
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分别写有数字﹣10π的五张大小和质地均相同的卡片从中任意抽取一张抽到无理数的概率是．
函数y＝中自变量x的取值范围是
分式方程的解为x＝．
如图双曲线y＝经过点P21且与直线y＝kx﹣4k＜0有两个不同的交点． 1求m的值． 2求k的取值范围．
假定你是李华你的朋友Peter想了解你校于五月举办的中国传统文化艺术节.请你给Peter写封回信内容包括 1.举办艺术节的目的 2.介绍你最喜欢的一个艺术节活动 3.邀请Peter参加并告之艺术节活动的时间. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
因式分解ax﹣ay＝．
我国古代的数学名著九章算术中有下列问题“今有女子善织日自倍五日织五尺．问日织几何”其意思为今有一女子很会织布每日加倍增长5日共织布5尺．问每日各织多少布根据此问题中的已知条件可求得该女子第一天织布尺．
假定你是李华你的朋友Tony刚刚升入高三因为暑期短他没休息好所以现在状态很差.面临高考压力Tony不知所措.请你给他写一封信表示安慰要点如下 1表示难过和理解 2就如何调整状态提出建议 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
计算﹣10﹣2sin30°+﹣1+﹣12019
WHO'SWHOINTHEZOO? IsitamazingthattheWHO'SWHOINTHEZOOmakesitfunforyoungchildrentosave?WiththehelpofStandardBank'sKidzAPPandtheBigFiveanimalfriendsteachingyourchildrenaboutmanagingtheircashhasneverbeenmorefun.LettheWHO'SWHOINTHEZOOshowyourlittleoneswhatitmeanstoearnandsavemoneyaswellasshareintheenjoymentofspendingtheirwell﹣earnedcash. Elephant Asyourchildrenusethemobileapptocompletevariousactions﹣achievingsavingsgoalscompletingmissionsandachievingwishes﹣herevariousmedalswillberewarded. Earnedmedalsaredisplayedintheelephanthabitataswellaslockedmedalsstilltobeachieved. Leopard Rewardyourkidswithpocketmoneyforcompleting‘missions'householdchoresachievementsetc. Youcancreateamissionforyourchildoryourchildcanrequestanewmission.Oncecreateditmustbeaccepted.Themissionneedstobecompletedbyyourchildandapprovedbyyoubeforeyoucanpayhimorher. Lion Helpyourchildrencreateandfulfilwishes.Wishcardsandtheirsavingsprogresscanbetrackedfromyourbankingapp. Oncetheirsavingsgoalisreachedlionwillinformyouoftheirachievement. Buffalo Kidzcanrequesttowithdrawcashorpurchaseairtimeanddatausingtheirsavings. Rhino Rhinoshowsyourchild'slatestaccountbalanceandtransactions. DownloadtheStandardBank'sKidzAPPfromAppleAppStoreonthephone.UsethecommentsectiontointeractwithotherStandardBankcustomersandbankconsultants. 1WhatistheWHO'SWHOINTHEZOOdesignedfor? A.Playersofboardgames. B.Kidsforself﹣servicebanking. C.Parentsforonlinebanking. D.Travelersinthezoo. 2Rewardswillbepaidif. A.thekidsfulfilyourcreatedmissions B.yourkidsgetenoughlockedmedals C.youkeeptheaccountbalanced D.youapprovetherequestviaKidzAPP 3Whichofthefollowinganimalsisrelatedtospending? A.Rhino. B.Leopard. C.Lion. D.Buffalo.
Theboysatonhischairwithhishandabovethekeyboard.Hethoughtaboutwhattowrite. Herecalledthatthecompetitiondeadlinewasmerelyaweekaway.Buthestillhadnotevenstartedonhispiece.Helookedatthebrochureagain.uWRITINGCOMPETITION!thetitleread.Hismomhadencouragedhimtoenterthewritingcompetitionandnowhewastakingitonashispersonaltaskfortheholidays. Astheboyreflectedonhispreviouswritingeffortsherealizedhowhopelesshistaskofwinningwas.Everystoryheeverwrotewasbasedonotherstories.Hehadlittleimaginationandunfortunatelyimaginationwasthekeytowriting. Suddenlyhehadabrainwave.Thistimehecameupwithanoriginalandimaginativestory. Thewordsshottowardshimlikeastormofleaves.Wordswerecomingeasilyflowingthroughhimfasterthanhecouldtype.Hetypedfasterthanheeverhadbefore.Hecontinuedtotypeamazedathoweasywritingthisstorywas.Theboycouldnotstopwriting.Helookedatthewordcountandsawthenumberu248^staringrightbackathim.Hewasnotevenhalfwayyet. Thenheheardthecallofhismothersayingtimeforbed.Hecontinuedwritingthepieceignoringher.Hehadtomakeupforthetimehehadlostthinkingaboutatopictowrite. Finallyhefinished.Thewordcountnowread498. Perfecthethoughtjustunderthewordlimit.Heknewthiswasthestorythatwouldwin. HewentontoGoogleandsearchedforthecompetition.HefoundthepagebuttherewasnoEnterbutton. 1Whatcausedtheboytotakepartinthewritingcompetition? A.Anewcomputer. B.Theprizemoney. C.Hisowninterest. D.Hismom'sadvice. 2Howdidtheboyfinishhisearlierwriting? A.Hismomhelpedhim. B.Hecopiedothers'ideas. C.Hisfriendsassistedhim. D.Heusedhisimagination. 3Whydidtheboydelayhiswriting? A.Becausehewasterriblylazy. B.Becausehedidn'tknowwhattowrite. C.Becausehewasn'tconfident. D.Becausehereadtoomanystories. 4Whichmightbethemaximumwordlimitforeachentry? A.100. B.250. C.500. D.1000.
Thehemlock铁杉treesalongtheWappingerCreekNewYorklookhealthy.HoweverscientistGaryLovettsaysthewhiteballswhichprovideprotectionforthebugsarecreatedbyatinyinsect.It'shardtobelievethetinybugcouldkillatree.Howevertreescanendupwithmillionsandmillionsofthepests.Whentherearethatmanyitendsupkillingthetree. ThebugfromEastAsiaisslowlykillingtreesacrosstheUSA.Thetrouble﹣makingbugisjustoneofmanyinvasive入侵的peststhathaveslippedintotheUnitedStates.Theycanhurtotherlivingthingsintheirnewhome. Manyinvasivepestsarriveonwoodenpalletspiledinsideshippingcontainers.Theysupportandseparategoodsandkeepthemfromslidingaround.Invasivepestsoftentunnelintothepallets.Howcanwestoppestsfromridingonpallets?Lovettsaysnewrulesareneeded.Thecompaniesthatmakepalletsdon'twantmorerules.Congresshasaddedanamendment修正案inthe2018FarmBilltotryandpreventthisproblem.HoweverLovettisnothopefulitwillmakemuchofadifference.Palletsarecheckedbyinspectors.Manyaresprayedwithbug﹣killingpesticide.IbelieveinthesystemsaidBrentMcClendonpresidentofTheNationalWoodenPalletandContainerAssociation.Healsosaidshippingcontainersarecheckedverycarefully. Stilleachyear13millioncontainersareshippedtotheU.S.Eachisfullofwoodenpallets.LovettsaysInspectorscan'tpossiblycheckeverything.Allittakesareafewbadpalletsweshouldgetridofwoodenpallets.Hebelievespalletsshouldbemadeofplasticoreco﹣compositewood.Eco﹣compositewoodisamixofwoodfiberandplastic.Insectscannothideintoit.Oneproblemisthatthesechoicescostmore.Theymaybeworththeextramoneythough.InvasivepestscosttheU.S.﹩5billionayear.Treesdon'tjustdieinforests.Theyalsodieincitiesandouryards.Thentheyneedtobereplaced.Thatcostsmoneytoo. 1AllthestatementsareTRUEexceptthat. A.pesticidehasbeenappliedtobug﹣killing B.invasivepestsarenativetoWappingerCreek C.invasivepestshideinpalletsusedinshipping D.thecompaniesmakingpalletsdon'twantmorerules 2Whatcanweinferfromthepassage? A.Bugscanbeeasilyspottedbyeyes. B.Bugsruintheshippinggoodsslowly. C.Bugswon'tbotherthetreeifjustinfewnumbers. D.Bugscovertreeswithwhitesoftballsforprotection. 3WhydoesGaryLovettwanttogetridofwoodenpallets? A.Becauseinsectsmostlydieinthem. B.Becauseplasticpalletsareeco﹣friendly. C.Becausetheyarenotworthextramoney. D.Becausetheyarethemajorpestcarriers. 4Whatdoesthepassagemainlytalkabout? A.InvasivepestsareharmingplantsintheUSA. B.Effectivemeasureshavestoppedthepestinvasion. C.Congresscontributesalottodealingwithinvasivepests. D.EcosystemintheUSAispoorlydamagedbyinvasivewoods.
如图△ABC内接于⊙OAC＝BCCD是⊙O的直径与AB相交于点C过点D作EF∥AB分别交CACB的延长线于点EF连接BD． 1求证EF是⊙O的切线 2求证BD2＝AC•BF．
LettersasawayofcommunicationhavelonggivenwaytophonecallsandWeChatmessages.ButaTVshowLettersAliveishelpingbringthisoldwaytokeepintouchback1thepresent. LettersAlivetook2itideafromaUKprogramLettersLivereleasedin2013.Both3showfeaturefamousactorsandactressesbutthere4benoeye﹣catchingvisualeffectsoranyregularshowbiz娱乐圈activities.Insteadit'sjustaliveevent5remarkablelettersselectedfromawidetimespanandadiverserangeofsubjectsareread.ThereisforexampleapassionateletterfromHuangYongyutoplaywrightCaoYu30yearsagotocriticizehislackof6create. Everyletterislikeasmallpieceofhistory.Byhearingthem7readit'sasifwearebeingsentbackintimetoexperienceamomentthatwewouldotherwiseneverhavehadthechanceto. Comparedto8publishtextslettersalso9naturalcomewithapersonaltouch.AswellascelebratingthepainjoywisdomandhumorLettersAlive10committopromotingChineseliteraturesincefirstrun.
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如图一次函数y＝kx+b的图象与反比例函数y＝的图象在第一象限交于点A32与y轴的负半轴交于点B且OB＝4． 1求函数y＝和y＝kx+b的解析式 2结合图象直接写出不等式组0＜＜kx+b的解集．
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计算+2sin30°﹣3.14﹣π0
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﹣2019的绝对值是
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操作体验如图在矩形ABCD中点EF分别在边ADBC上将矩形ABCD沿直线EF折叠使点D恰好与点B重合点C落在点C′处．点P为直线EF上一动点不与EF重合过点P分别作直线BEBF的垂线垂足分别为点M和N以PMPN为邻边构造平行四边形PMQN． 1如图1求证BE＝BF 2特例感知如图2若DE＝5CF＝2当点P在线段EF上运动时求平行四边形PMQN的周长 3类比探究若DE＝aCF＝b． ①如图3当点P在线段EF的延长线上运动时试用含ab的式子表示QM与QN之间的数量关系并证明 ②如图4当点P在线段FE的延长线上运动时请直接用含ab的式子表示QM与QN之间的数量关系．不要求写证明过程
It1debateforyearsAreeggsgoodorbadforyou?Peoplewhoeatanaddedthreeorfoureggsaweekor300milligramsofdietarycholesterol胆固醇perdayhaveahigherriskofbothheartdiseaseandearlydeathcomparedwiththosewhoeat2feweggsnewresearchfinds. Eggs3specialtheyolkareamajorsourceofdietarycholesterolwroteVictorZhong.In4studypublishedFridayinthemedicaljournalJAMA5therearemanyunexpectedreportsheandhiscolleaguesnotedthatasinglelargeeggcontainsabout186milligramsofcholesterol.Overthefollow﹣upperiodatotalof5400cardiovascular心血管的6eventoccurredincluding1302fatalandnonfatalstrokes1897incidentsoffatalandnonfatalheart7failand113otherheartdiseasedeaths.Anadditional6132participantsdiedofothercauses.8consumeanadditional300milligramsofdietarycholesterolperdaywasassociated9a3.2%higherriskofheartdiseaseanda4.4%higherriskofearlydeathZhong'sanalysisofthedatashowed. Eggsareanutritiousfood.Whilethisstudyfocusesontheamountwe'reeatingit'sjustasimportant10payattentiontohowtheeggsarecookedandtothetrimmingsthatcomewiththemsaidTaylorwhowasnotinvolvedintheresearch.
如图在正方形ABCD中点EF分别在边CDAD上且AF＝CE． 1求证△ABF≌△CBE 2若AB＝4AF＝1求四边形BEDF的面积．
下列立体图形中俯视图不是圆的是
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A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. WhenIwasinthe6thgrademyparentsboughtmeacellphone.Iwasreallyexcitingtoreceivethephone.ThenextweekendmyfamilywentoncampingintheEastLakePark.Weenjoyboatingonthelake.Iusedournewphonetoplaysomeofmyfavoritesong.Ithoughtitwouldbebrilliantideatoputmyphoneinaplasticbagtoprotectingitfromwater.AftergettingbackItookthephoneinonlytofindthebagfullofwater.Ididn'tknowwhattosavemyphoneandItriedlayingitouttodry.Unfortunatelyitstartedtorain.Whatanawfullyexperience!
Whileelephantsbornwithouttusks长牙arenotunheardoftheynormallyformjust2to6percentofthepopulation.HoweverthatisnotthecaseatMozambique'sGorongosaNationalParkwhereanastonishing33percentoffemaleelephantsbornafterthecountry^civilwarendedin1992aretuskless.WhilethatmayappeartobejustacoincidenceJoycePooleanelephantbehaviorexperthasanothertheory.Theresearcherthinkswemaybewitnessingunnaturalevolutionofthespeciesduetotheconstanthuntingofelephantsforvaluableivory. Poolesaysbeforethecountry's15﹣year﹣longcivilwarthe100000﹣acreparkwashometoover4000elephants.Howeverbythetimetheconflictendedin1992about90percentofthemhadbeenkilledforivorytohelpfinanceweapons武器andmeattofeedthesoldiers.Ofthelessthan200survivorsover50percentofadultfemaleshadnotusks.Thereforeitisnotsurprisingthatthepark'stusklesselephantpopulationhasgrowngreatly. Thisisnotthefirsttimeresearchershaveobservedagreatchangeinthepopulationofelephants.AtZambia'sSouthLuangwaNationalParkandLupandeGameManagementAreaareaswhichwereheavilyhuntedinthe1970sand1980s35%ofelephants25yearsorolderand13%ofthoseyoungerthan25arenowwithouttusks.A2008studypublishedintheAfricanJournalofEcologyfoundthatthenumteroftusklessfemalesattheRuahaNationalParkinTanzaniawentfrom10.5percentin1969toalmost40percentin1989largelyduetoillegalhuntingforivory. TherecentbanonivoryinboththeUSandChinashouldhelpgetridoforatleastreduceelephanthunting.Howeverscientistsarenotsurehowlongitwilltakeforelephantswithahigherrateoftusklessfemalestochangethetrend. 1WhatistheprobablecauseofthephenomenonmentionedinParagraph1? A.Illegalhunting. B.Constantfarming. Apurecoincidence. D.Naturalevolution. 2WhydidpeoplekillsomanyelephantsduringthecivilwarinMozambique? A.Togetfundsbysellingivory. B.Todevelopnewweapons. C.Toprovidefoodforlocalpeople. D.Tomakeivoryproducts. 3Whichofthefollowinghadtheearliestrecordontusklesselephants? A.GorongonsaNationalPark. B.SouthLuangwaNationalPark. C.TheRuahaNationalPark. D.LupandeGameManagementArea. 4Whatdoestheunderlinedphrasethetrendinthelastparagraphreferto? A.Elephantsfacinggreaterdanger. B.Elephantsgrowingmoreslowly. C.Fewerfemaleelephantsstayingalive. D.Morefemaleelephantsbeingtuskless.
ItwasNewYeartime.Weweretravellinginavan货车1toystothehomeless. Whenwe2thespotsomethingcaughtmyeye.Somethingorsomeonewasmovingintherubbish.SoonI3thatitwasthehomeofapoorfamily.Thereweretwo4bothaboutmyageatthetimeandaladyIsupposedtobetheirmother.Theysatthere5. AsalittlegirlmyselfIwas6interestedinthelittlegirl.How7ourliveswere.Shelivedfortheday8throughtherubbishforsomethingtofillherstomach.Iontheotherhandwaswelllookedafterandneverhadtoworryabout9Ihadagoodeducationandthusa10future.Ilookedatthelittlegirl.Theonly11shehadwastheworn﹣outdressthatshewaswearing. SeeingthislittlegirlImadethedecisionto12adollthathadbelongedtomeforawhile.Whenthevancametoa13Isteppedoutcalledthegirloverand14thedollinherhand.Atfirstshelookedatmewith15andwasn'tcertainwhattodobutthenshesmiledandIsaw16inhereyes.Iwentbackintothevehicleandwestartedto17offandthat?swhenwerealizedthelittlegirlwasrunning18Westoppedagainandopenedthedoor.Thegirlhad19withus.Shelookeddirectlyatmeandsaidtwo20wordsThankYou. 1A.showing B.recommending C.distributing D.selling 2A.left B.changed C.chose D.approached 3A.guaranteed B.realized C.decided D.accepted 4A.boys B.children C.drivers D.adults 5A.happily B.angrily C.hopefully D.helplessly 6A.still B.less C.especially D.probably 7A.similar B.different C.difficult D.ordinary 8A.searching B.getting C.running D.breaking 9A.food B.safety C.health D.transport 10A.doubtful B.distant C.promising D.foreseeable 11A.present B.decoration C.requirement D.possession 12A.giveaway B.giveback C.handout D.handin 13A.station B.stop C.street D.signal 14A.tore B.placed C.dropped D.threw 15A.anger B.pain C.surprise D.disappointment 16A.hope B.loneliness C.anxiety D.astonishment 17A.walk B.get C.lift D.drive 18A.behind B.away C.out D.in 19A.gotalong B.comealong C.caughtup D.turnedup 20A.final B.new C.key D.simple
Wearesurroundedbymessagestryingtogetourattention.Advertiserspoliticiansandothergroupsalltrytogetustoagreewiththem.1.Propagandaisnotalwaysabadthingbutitoftenhidesthetruthaboutatopic.It'sverysimilartoadvertisingwhosegoalistogetpeopletobuysomethingwhilepropagandaistochangewhatpeoplebelieve. PropagandaTechniques Tocreatepropagandaacommontechniqueisname﹣calling.Apoliticianmightcallsomeoneatraitororliarwhichmakestheotherpersonlookbad.Anotheristhetrendtechnique.Peoplewanttobeonthesideinthefavor.2.Somepropagandaisbasedonfear.Itscarespeopleintochoosingacertainsideortakingactionwhichmightnotbebad.Anti﹣smokingcampaignsareoneexample.Theymayscarepeopleintothinkingthatiftheysmoketheywillgetcancer. 3Propagandaisusedbymanygroupssuchasbusinessespoliticiansandthegovernment.Itisspreadthroughposterstelevisionandradio.TheInternetmakesiteasytosendmessagestothewholeworld. TypesofPropaganda Politicalpropagandahasbeenaroundaslongastherehavebeenpoliticians.4.Peoplehaveuseditformanyyears.WarpropagandabeganduringWorldWarImorethan100yearsago. Toseeifpropagandaissayingthetruthpeopleneedtodoextrawork.Forexampleadsmightalwayssoundlikethey'retrue.Butbeforeyoubelievethemtrytothinkaboutwhocreatedandpaidforthem.Findoutwhytheydidit.5. A.PropagandaTargets B.PropagandaMediums C.Anotherwordforthisispropaganda D.Somostpeoplewillagreewiththosepoliticians E.Thenyoucandecideifthey'rebeinghonestornot F.Howeverreligiouspropagandawasactuallythefirstofficialone G.Peoplemightjoinsomeonewhoclaimstobepopularorwinning
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