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关于x的方程＝+1无解，则m的值是（ ）
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若关于x的方程﹣=1无解则m的值是______.
若关于x的分式方程无解则m的值为.
若关于x的分式方程无解则m的值为
0
2
0或2
±2
若关于x的方程无解则m的值是.
关于x的分式方程无解则m的值是
若关于x的方程无解则m的值为
m＝1
m＝-1
m＝2
m＝-2
若关于x的分式方程无解则m的值为
4
3
2
1
若关于x的方程＋1无解则a的值是__________.
已知关于x的方程2a+bx﹣1=0无解那么ab的值是
负数
正数
非负数
非正数
根据函数y＝|2x－1|的图象判断当实数m为何值时方程|2x－1|＝m无解有一解有两解
若关于x的方程ax2+2x﹣1=0无解则a的值可以是
1
0
﹣1
﹣2
若关于x的方程无解则a的值为_______.
已知关于x的方程2a＋bx－1＝0无解那么ab的值是
负数
正数
非负数
非正数
若关于x的分式方程无解求m的值
关于x的方程无解则m的值是
﹣1
0
1
2
当m=时关于x的方程无解.
关于x的方程无解求m的值．
关于x的方程无解则m的值为
﹣5
﹣8
﹣2
5
关于x的方程无解则m的值是
﹣1
0
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2
若关于x的分式方程无解则m的值为
4
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1
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6分Questioningtheexistenceofaliensissomethingthatscientistshavedonefordecades.Infactmostpeopledobelievethataliensexistinsomefashion.Themainnecessitiesforlifearewaterandsomeformofenergysource.Notsurprisinglytherearesomeplanetsexoplanetsandmoonsthatfitthebill.Hereareseveralbestchancesatfindinglifeintheuniverse. ◆TRAPPIST﹣1 TRAPPIST﹣1isaplanetarysystemafewdozenlight﹣yearsawaywhosediscoverywasannouncedinearly2017.ThissystemconsistsofsevenEarth﹣likeexoplanetsorbitinganultra﹣coolstaranditisoneofourshotsatfindingpossiblelifebeyondourownsolarsystem. ◆Titan TitanisthelargestmoonofSaturnthesixthplanetfromourSun.Thismooncouldpotentiallyharborlifebutpossiblynotinthesensethatwethink.Titandoesnotexactlyfitthedescriptionofbeinginatypicalhabitablezone. Titanhaswaterandithasliquid.Itjustdoesn'thaveliquidwater.Thewateronthismooniscompletelysolidbecauseoftheextremelycoldtemperature. ◆Europa EuropaisoneofJupiter'smoonshereinourownsolarsystem.Itisanothercandidateduetoitspotentialtoholdliquidwater.Europaisthoughttohaveallthenecessitiesforlifeincludingwaterenergysourcesandtherightchemicalbuild﹣up. ◆Mars TheRedPlanetthefourthfromtheSunisprobablyoneofthemosttalked﹣aboutpotentialcandidatesforextraterrestrial地球外的lifeandevenforhumancolonization.DespitesomedifferentvoicesfindingextraterrestriallifeonMarsreallyisaseriouspossibility. Weknowbynowthatwewon'tfindlittlegreenmenoranyintelligentformoflifethatweunderstand.Howeverthereisevidencethattherewasandmaystillbemicroscopiclifeonthesmallredplanet. 1Thecommonpointofthesecelestialbodiesisthat. A.solidwaterexistsonthemrespectively B.lifemightexistoneachofthem C.theyallcontainliquidwater D.eachofthemhaslivingthingsonit 2Whichcelestialbodycouldhavelifedifferentfromhumanimagination A.TRAPPIST﹣1. B.Titan. C.Europa. D.Mars. 3WhichofthefollowingstatementsisTRUE A.Europaisthemosttalked﹣aboutpotentialcandidateforextraterrestriallife. B.TRAPPIST﹣1istheonlybodythatcontainslifebeyondthesolarsystem. C.Allthescientistsdobelievethataliensexistinsomemanner. D.ThereisproofthatlifeexistedonthecelestialbodyMars.
10分ThreeinfivepeopleintheUKholdalibrarycard.Forsomethey'reashelterfromthestressesofday﹣to﹣daylife.1Ifyou'reconsideringjoiningyourlocallibrarynowisthetimetodoso.Andifyouneedanymoreencouragementhereareseveralreasonswhyyoushould. MostlibrariesintheUKallowmembersofthegeneralpublictocomeandgoastheylike. 2Youcanalsotakeoutalibrarycardandborrowbooksforfreealthoughyouwillinevitablyfaceafineforlatereturns. 3ImaginejusthowmanybooksyouhaveatyourfingertipswithalibrarycardTherearelotsofmodernonesaswellasoriginalsandyoucancontinuetoexpandyourlearningandvocabularyallthetime.It'sapricelessexperienceespeciallyforkidsandalsoagreatwaytoleveltheeducationalplayingfield. Librariesdevelopwithtimes.Theyhavechangedgreatlysincedecadesago.4Somelibrarieshaveappssoyoucanseewhenyourbooksareduebackandevenreservebooksinsomecases.Therearealsolibrarieswhichletyouaccessbooksindigitalformatsonyourmobiledevice﹣prettycool. Librariesareoneofveryfewspacesleftintownsandcitieswheremembersofthepubliccancometogetherandactuallybeandfeellikeacommunity.Theyhavenoticeboardstoofferserviceslikeexerciseclassesorlearningcenters.5 A.Librarieshelppeoplelearn. B.Librarieshelpeducatethekids. C.Theycreateagreatsenseofcommunity. D.Youcangoinsettledownandreadabookwithoutbeingchargedapenny. E.MostlibrariesnowhavecomputersandallowpeopletoborrowCDsandDVDs. F.Librarieshelpussavemoneyaswe'reborrowingbooksratherthanbuyingthem. G.Forothersparticularlythehomelessandpeopleinpovertyalifelinetotheworld.
“吃得营养吃得安全吃出健康”是人们普遍的饮食追求．下列做法正确的是
8分TreessomeofthetallestintheworldtoweredaboveHannahGriffithsandhercolleagueseachmorningastheywalkeddeepintotherainforestintheMaliauBasininBorneowheretheyhadsetupasetofexperimentstolookattheecologicaleffectsofsmallcreatures:termites白蚁. Termitesgetabumrap.TheymakeheadlinesforchewingupbillionsofdollarsofpropertyeachyearintheU.S.Andtheyareresponsibleforsomethingliketwopercentofglobalcarbonemissionssimplyasaresultoftheirhugepopulationsandpreferenceforchewingthroughcarbonrichmaterials.Awholeindustryisaimingatkillingthem. Buttheyplayakeyroleinmanynaturalecosystems.Scientistshaveknownforyearsthatintropical热带的foreststermiteschewupfallenleavesanddeadwoodkeepingthefallenmaterialundercontrolandlettingnutrientsfromthedeadmaterialbackintothesystemtobeusedbyotherplantsinsectsandanimals.Buttheydidn'tknowexactlyhowimportanttheinsectswereinkeepingtheforesthealthyandfunctionalsotheyremovedtermitesfromaparticularspotintheforestandsawhowitresponded. AsluckwouldhaveitHannahGriffithsandhercolleaguesstartedtheirexperimentwhentheforestwashitbyanextremedrought干旱.Duringthenon﹣droughtyearstheysawtherewasn'tmuchdifferencebetweenthenormalplotsandtheoneswherethey'dremovedthetermites.Butduringthedroughttheeffectsweremarked.Whattheyfoundwasunexpected:inthetermite﹣richareasthesoilstayedslightlywetmoretreeseedlingssprouted抽芽andthesystemwasfullofactivitydespitethelongharddryclimate. ForGriffithsitwasonlybecausetheyhappenedtostudythedroughtthattheycouldpickouttherealimportanceoftermitestothesystemshepointsout.Andthatringsalarmbellsinmyheadshesaysbecauseitmakesmethinkwellwhatelsedon'tweknowIfwestartdamagingbiologicalcommunitieswedon'tknowwhatthatwilldo. 1WhichofthefollowingbestexplainsabumrapunderlinedinParagraph2 A.Unfairblame. B.Widepopularity. C.Publicattention. D.Specialpreference. 2Whathavescientistslearnedabouttermites A.Theydoseriousharmtotropicalrainforests. B.Theycontributealottotheecosystemtheylivein. C.Theyactasfoodforotherplantsinsectsandanimals. D.Theyspeedupthelossofnutritionintherainforest. 3WhatcanweinferfromthefindingofGriffithsexperiment A.Termiteshelpforestssurviveclimatechange. B.Termitespreferdroughtyearstonon﹣droughtones. C.Termitesbenefitmorefromtheforestduringthedrought. D.Termitesenjoyeatingtreeseedlingsduringthedrought. 4WhatdoesGriffithstellusinthelastparagraph A.Termitesarenowindangerofextinction. B.Termitesdamagebiologicalcommunities. C.Weshouldthinktwicebeforedamagingaspecies. D.Weshouldstudythedroughttoimprovethesystem.
亚氯酸钠NaClO2是一种高效的氧化剂漂白剂该物质中Cl的化合价为
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15分HowmanyhoursdidyouspendreadinglastweekThisquestion1arriveinthousandsofAmericanhomeseveryotheryearsince1992aspartoftheUniversityofMichigan'sHealthandRetirementStudy.In2016researchersfoundthatpeoplewhoidentifiedthemselvesasregularbookreaderswere23percent2littlelikelytodiebetween2001and2012than3whoreadonlynewspapersormagazines. Youmayalreadybefamiliarwithrecentfindthatsuggestchildrenwhoreadbookswiththeirparentsseveraltimesaweekscorehigher5intelligentteststhannonreaders.Butrecentresearcharguesthatreadingmaybejustasimportantinadulthood.When6practiseoveralifetimereadingandlanguage﹣acquisitionskillscansupport7healthbrainfunctionsinbigways. Whatisitaboutreadingbooksthatboostsourbrainpowerwhereasreadingnewspapersdoesn't Foronereadingabookofanygenreforcesyourbraintothink8criticalandmakeconnectionsfromonechaptertoanotherandtotheoutsideworld9mayprovideagreaterdefenseagainsttheworsteffectsorcognitivedecay.Secondlyreadingbooksespeciallyfictionhasbeenshowntoincreaseempathyandemotionalintelligencebothofwhichareproven10helpyoulivelonger.
丁二酮C4H6O2可用作糖果增香剂．下列关于丁二酮的说法中正确的是
下列属于化学变化的是
除去下列物质中的杂质括号内为杂质所用试剂或方法不正确的是
25分假如你是校英文报编辑李华.你校原定于本星期五下午在302室举办的英文经典片段配音比赛EnglishDubbingContest因故需更改时间和地点.请你写一封电子邮件通知评委中的外教Mrs.Jenkins内容包括: 1.比赛更改原因; 2.更改后的安排; 3.表达歉意. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯.
扬州市进行中考化学实验考查给出以下三个考题①粗盐提纯②二氧化碳的制取和收集③氧气的制取和收集．考查规定由学生抽签确定考题甲同学抽签后被监考老师引导至准备了下列仪器和药品的实验台前 Ⅰ．1图中仪器A的名称是甲同学抽到的考题是填序号实验前甲同学发现其中缺少了一种药品该药品是写出该实验反应的化学方程式． 2如图是甲同学实验时的主要步骤这些步骤的正确顺序是填字母标号 其中装置有误的是填字母标号改正的方法是． 3若另选药品也能完成另一个考题的气体制备反应的化学方程式为． Ⅱ．乙同学抽签并完成实验后监考老师要他回答如下问题请你帮他回答． 4在过滤操作中玻璃棒的作用是． 5将10克NaOH固体完全溶解在40毫升水中水的密度为1g/cm3所配溶液中溶质的质量分数为．某同学在配制过程中量取水时仰视读数其它操作均正确其所配氢氧化钠溶液中溶质的质量分数将填“偏大”或“偏小”．
8分Plantsareboring.Theyjustsittherephotosynthesizing光合作用whileanimalshaveallthefun.RightNotsomuch.Anewstudyhasfoundthatthereisalonghistoryofinteractionsbetweenantsandplants.Theantandplantco﹣evolution协同进化startedwithantsfeedingonplantsandplantsevolvingant﹣friendlyfeatures. Plantsmakeanumberofdifferentstructuresthatarespecificforantuse.Someplantshaveevolvedfeaturesthatpersuadeantsintodefendingthemfromattackfromotherinsectsandevenmammals.Theseincludehollowthornsthatantswillliveinsideorextranectar琼浆onleavesorstemsfortheantstoeat.Someantswilljustcheatandtakethenectarandrunbutsomewillstickaroundandattackanythingthattriestohurttheplant.Otherplantsgetantstohelpthemmovetheirseedsaroundbyprovidingthemwithrichfoodpacketsattachedtotheseeds.Theantwillpickuptheseedandcarryitawayeatthefoodpacketandleavetheseed﹣ofteninanutrient﹣richareawhereit'llgrowbetterandsinceit'sfartherawayfromitsparenttheywon'thavetocompeteforresources. Butscientistsweren'tsurehowtheevolutionaryrelationshipbetweenantsandplantsgotstarted.Ifevolutionisanarmsracebetweenspeciesdevelopingwaystomakeuseoftheirneighborsthenscientistswantedtoknowwhetherplantsorantsfiredthefirstshot.Itwasachicken﹣and﹣eggquestionwhetherthingsstartedwithantsdevelopingbehaviorstotakeadvantageofplantsorplantsevolvingstructurestotakeadvantageofants. Thehistoryofantsandplantsevolvingtogethergoesbacktothetimeofthedinosaursandit'snoteasytotellfromfossilswhofiredthefirstshot.Howeveritisaquestionoflittlesignificance.Scientistssaytheirstudymattersbecauseitprovidesalookathowthesewidespreadandcomplexinteractionsevolved. 1Someplantsattachfoodpacketstotheirseedsinorderto. A.rewardtheants B.makeafoolofants C.providenutritionfortheseeds D.gettheseedsmovedaround 2WhatdoesParagraph2mainlytellus A.Howplantsandantsinteract. B.Whatantsdotoprotectplants. C.Howplantsandantssurviveattacks. D.Whyplantsandantsneedco﹣evolution. 3Whichistrueabouttheevolutionaryrelationshipbetweenantsandplants A.Antsdependedmoreuponplants. B.Itcausedaraceforbetterevolution. C.Howitgotstartedwasuncertain. D.Itwasoflittlevalueforfuturestudies. 4What'stheauthor'spurposeofwritingthepassage A.Tointroduceascienceresearchmethod. B.Toinformreadersofalatestresearchfinding. C.Toarousereaders'interestinscienceresearch. D.Tocriticizepeople'straditionalviewsaboutplants.
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15分Researchershavediscoveredthepeoplewiththe1healthyheartsintheworld.TheTsimanepeopleliveintheAmazonregionofBoliviaandhavealmostnoriskofseriousheartdiseasebecause2theirplant﹣baseddietandhighlevelsofphysicalactivity.Besides3haveahealthyhearttheTsimanealsohavelowbloodpressureandlowbloodsugar.This4meantheyarefreeofmanyofthediseasesandconditions5killhundredsofmillionsaroundtheworld.Astudyshowedthatan80﹣year﹣oldTsimanepersonhas6samecardiovascular心血管的ageasanAmericanintheirmid﹣50s. ThestudyontheTsimanewaspublishedinthemedicaljournalTheLancet.Studyco﹣authorDr.GregoryS.Thomasstated:Thisstudysuggeststhatsomediseasescould7avoidifpeopleadoptedsomeelementsoftheTsimanelifestylesuchaskeepingtheirbloodpressureandbloodsugarverylownotsmokingandbeing8physicalactive.Headded:Itmaynotbepossibleforpeopleintheindustrializedworld9copytheTsimanecommunity'swayoflifebuttherearecertainly10aspectoftheirdietandlifestylethatwecanbetterbringintoourlivestohelpreduceourriskofheartdisease.
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下列属于“节约用水”标志的是
下列实验现象描述正确的是
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10分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. DearGeorge It'sbeenaweekafterweleftyourfamilyandwearenowbackhome.Thankyouverymuchforshowingthemaroundyourcityandprovidingusforthewonderfulmeals.AfterwesaidgoodbyetoyouwewenttoWashingtonD.C.therewestayedforthreeday.Mybrotherwassomuchfondofthemuseumstherethathebeggedmyparentstostayinganothercoupleofdays.HowevermyfatherhadtoreturntoworkonMondaysoweflybacklastSaturdayafternoon.Itwasrealaniceexperience.Ifyou'dliketomaketriptoourcitysomedayIwillbemorethanhappytobeyourguide. Yours LiHua
化学与生活密切相关． 1为了全民健康卫生部推广使用强化加铁酱油这里的“铁”指的是填“单质”“元素”或“原子”． 2下列食品中能提供丰富蛋白质的是填字母序号． 3厨房中的碗多为瓷器普通陶瓷中含有铝元素铝在地壳中的含量居所有金属元素第位其氧化物的化学式为．陶瓷和玻璃的主要成分都是硅酸盐它们同属于材料填字母． A．合成B．无机C．复合 4水处理过程中除去水中的有色物质和有臭味的物质可用填物质名称加入明矾的作用是．区分硬水和软水可用填物质名称．
硫酸亚铁晶体FeSO4•xH2O是一种重要的食品和饲料添加剂． 【查阅资料】①硫酸铜粉末为白色它吸水且与水反应变成蓝色 ②Fe2SO43+Fe═3FeSO4 ③硫酸亚铁晶体加热会先失去结晶水高温会继续分解产生一种金属氧化物和两种非金属氧化物． 【探究一】工业上利用表面含有油污且生锈的废铁屑制备硫酸亚铁晶体． 1下列能够去油污的试剂是填字母． A．水B．纯碱溶液C．明矾溶液D．稀硫酸 2步骤②常采用水浴加热方法该方法的优点是写出步骤②中属于复分解反应的化学方程式．控制“一定量稀硫酸”目的是使铁过量其原因是． 3步骤③要趁热过滤的原因是． 4步骤④的操作步骤为降温结晶过滤洗涤干燥等． 【探究二】某硫酸亚铁晶体FeSO4•xH2O热分解研究按图2装置将硫酸亚铁晶体样品高温加热使其完全分解对所得固体气体产物进行探究假设装置中各试剂均足量 5装置B中硫酸铜粉末变蓝说明产物中有装置C中高锰酸钾溶液褪色说明产物中还有．D装置中球形干燥管的作用是．实验后要继续缓慢的通入氮气目的是否则测出的x会填“偏大”“偏小”或“不变”． 6某研究所利用热分析仪对硫酸亚铁晶体FeSO4•xH2O进行热分解获得相关数据绘制成固体质量﹣﹣分解温度的关系如图3 ①633℃以上时固体呈红棕色此固体化学式为． ②计算FeSO4•xH2O中的x写出计算过程FeSO4的相对分子质量152． ③写出固体质量由4.56g变为2.40g时的化学方程式．
25分你校昨天举行了年度校园科技节Science&TechnologyDay.请你写一篇日记内容包括: 1.科技节的主要内容; 2.你所参加的活动及原因; 3.你的感想. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯.
在催化剂的作用下用O2将HCl转化为Cl2可提高效益减少污染．主要流程如图下列关于该原理说法不正确的是
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下列数据是一些食物的近似pH其中呈碱性的是
反应2NH4ClO4N2↑+Cl2↑+2O2↑+4X中X的化学式是
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