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我国科学家侯德榜在氨碱法的基础上创立了更为先进的联合制碱法（候氏制碱法），其生产流程简明如下： 请读识流程图并回答下面问题： （1）写出沉淀池中发生反应的化学方程式 ； （2）上述流程中...
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发明了联合制碱法而被誉为我国制碱工业先驱的科学家是
候德榜
张青莲
拉瓦锡
门捷列夫
以下关于氨碱法与联合制碱法的认识不正确的是
氨碱法生产纯碱的原料便宜易得，步骤简单，是最早的制碱工艺
联合制碱法又称侯氏制碱法，是侯德榜在氨碱法的基础上改造形成的
在联合制碱法中，氯化钠的利用率比氨碱法中的高
联合制碱法避免了氨碱法中对氯化钙的处理
发明了联合制碱法的科学家是
侯德榜
拉瓦锡
门捷列夫
张青莲
研制出世界先进的制碱工艺打破西方国家对碱业的垄断为我国制碱工业做出贡献的科学家是
侯德榜
张謇
詹天佑
茅以升
下面是我国几位著名的化学家其中打破国外技术封锁潜心研究制碱技术发明联合制碱法的科学家是
侯德榜
张青莲
孙师白
张允湘
发明联合制碱法为抗战时期民族工业发展做出重大贡献的科学家是A.侯德榜B.詹天佑C.茅以升D.陈嘉庚
发明了联合制碱法而被誉为我国制碱工业先驱的科学家是
候德榜
张青莲
拉瓦锡
门捷列夫
发明了联合制碱法而被誉为我国制碱工业先驱的科学家是
候德榜
张青莲
拉瓦锡
门捷列夫
发明了联合制碱法的科学家是
张青莲
拉瓦锡
道尔顿
侯德榜
打破西方国家对碱业的垄断为我国的制碱工业做出贡献的科学家是
侯德榜
严复
林觉民
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发明联合制碱法为纯碱和氮肥工业技术的发展作出了杰出贡献的科学家是
张青莲
侯德榜
门捷列夫
拉瓦锡
著名化学家侯德榜发明了联合制碱法为我国化学工业的发展作出了杰出贡献．联合制碱法中的碱属于填酸碱或盐它
许多科学家为人类进步作出了巨大贡献．发明联合制碱法的科学家是
张青莲
侯德榜
拉瓦锡
道尔顿
下图照片中的人物是中国近代著名科学家侯德榜他的主要成就是
研制“两弹一星”
发明“联合制碱法”
主持修建京张铁路
译述《天演论》
下面是我国几位著名的化学家．其中打破国外技术封锁潜心研究制碱技术发明联合制碱法的科学家是
侯德榜
张青莲
孙师白
张允湘
发明了联合制碱法被誉为制碱工业先驱的科学家是
门捷列夫
侯德榜
阿伏加德罗
拉瓦锡
发明了联合制碱法的科学家是【】
侯德榜
拉瓦锡
门捷列夫
张青莲
下面是我国几位著名的化学家其中打破国外技术封锁潜心研究制碱技术发明联合制碱法的科学家是-------
侯德榜
张青莲
戴安邦
鲁嘉锡
发明联合制碱法堪称我国我国化学工业的奠基人的是
侯德榜
康有为
魏源
张謇
我国著名化学家侯德榜发明的联合制碱法中的碱是指可用于改良酸性土壤的碱.
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解不等式组
计算20190+﹣1＝．
某校为了开展“阳光体育运动”计划购买篮球足球共60个已知每个篮球的价格为70元每个足球的价格为80元． 1若购买这两类球的总金额为4600元求篮球足球各买了多少个 2若购买篮球的总金额不超过购买足球的总金额求最多可购买多少个篮球
1分﹣Whydoyoulikeworkinginthiscompany ﹣ThefriendlyatmosphereisIlike. A.which B.that C.how D.what
小韦和小黄进行射击比赛各射击6次根据成绩绘制的两幅折线统计图如下以下判断正确的是
一个多边形的内角和是1080°这个多边形的边数是．
阅读理解 已知两点Mx1y1Nx2y2则线段MN的中点Kxy的坐标公式为x＝y＝． 如图已知点O为坐标原点点A﹣30⊙O经过点A点B为弦PA的中点．若点Pab则有ab满足等式a2+b2＝9． 设Bmn则mn满足的等式是
1分﹣Madamwhenisthenexttrain ﹣Itat5thisevening. A.wasleaving B.left C.leaves D.hasleft
如图已知a∥b∠1＝58°则∠2的大小是
10分短文改错 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.每处错误仅涉及二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. Smartphoneshadbecomepartofourdailylife.Nomatterwhowearewecanseepeoplebusyplaywiththeirsmartphones.Smartphonesarebenefittous.Theyhelpusescapethepressuresoflifeorgetinformation.Thereforeifwespendtoomuchtimeonthemwewon'thavetimecontactfacetofaceourfriendsandfamily.Andourlifestudyandworkwillbehurt.Inmyviewweshouldlimittoourusingsmartphonesexceptforapurposeoflearning.Meanwhileit'sabsolutenecessaryforustotakepartinmoreoutdooractivities.
方程＝1的解是
如图菱形ABCD中作BE⊥ADCF⊥AB分别交ADAB的延长线于点EF． 1求证AE＝BF 2若点E恰好是AD的中点AB＝2求BD的值．
观察一列数﹣3036912…按此规律这一列数的第21个数是．
一周时间有604800秒604800用科学记数法表示为
四边形具有不稳定性．如图矩形ABCD按箭头方向变形成平行四边形A'B'C'D'当变形后图形面积是原图形面积的一半时则∠A'＝．
如图某校教学楼AC与实验楼BD的水平间距CD＝15米在实验楼顶部B点测得教学楼顶部A点的仰角是30°底部C点的俯角是45°则教学楼AC的高度是米结果保留根号．
1分Thetotalnumberofsharedbikesareeasytorentthroughsmartphoneappsisincreasingrapidly. A.which B.why C.that D.who
不等式组的解集是
1分Chinanowhasaverygoodplatformforoverseasreturneestheirdreams. A.achieve B.achieved C.havingachieved D.toachieve
如图在△ABC中点D是AB边上的一点． 1请用尺规作图法在△ABC内求作∠ADE使∠ADE＝∠BDE交AC于E不要求写作法保留作图痕迹 2在1的条件下若＝2求的值．
一艘轮船在相距90千米的甲乙两地之间匀速航行从甲地到乙地顺流航行用6小时逆流航行比顺流航行多用4小时． 1求该轮船在静水中的速度和水流速度 2若在甲乙两地之间建立丙码头使该轮船从甲地到丙地和从乙地到丙地所用的航行时间相同问甲丙两地相距多少干米
8分Itdoesn'tmatterifbooksaredeliveredinprintorbysmartphoneandthemainthingistogetlostinreadingthem. WhyshouldwebotherreadingabookAllchildrensaythisoccasionally.Manyadultswithreadingdifficultiesrepeatittothemselvesdaily.Inaworldofacceleratingtechnologyincreasingtimepovertyanddecreasingattentionlengthsshouldtheydevoteprecioustimesinkingintoagoodbook Thediscoveryisthatanextraordinarybookhasatransformativeeffectonthewayweviewtheworld.Thistransformationonlytakesplacewhenweloseourselvesinabookabandoningtheemotionalandmentalchatoftherealworld.That'swhystudieshavefounddeepreadingmakesusmoreattentivetotheinnerlivesofothers. Weknowreadingisthefoundationstoneofalleducationandanessentialstrengthoftheknowledgeeconomy.Butperhapsevenmoresignificantisitsemotionalroleasthestartingpointforindividualdevelopmentandpleasure.Bookscanopenupemotionalimaginativeandhistoricalviewsthatequalandextendthecorridors通道oftheweb. Ifreadingweretodeclinesignificantlyitwouldchangetheverynatureofourspecies.Ifweinthefuturearenolongerwiredforourownreflectionandcreativethoughtwewillbeweaker.Howevertechnologythrowsupsolutionsasmanyaschallengesforeverydooritclosesanotheropens.Sotheabilityofferedbyequipmentslikee﹣readerssmartphonesandtabletstocarryanentirelibraryinyourhandisanamazingopportunity.Weshouldconcentrateonthemessagenotworriedaboutthemedium. Wemustalsogetbetteratcontrollingtheabilityoftheinternettoinformreadersandpotentialreadersaboutallthenewbooksthatarepublishedeveryyearandtorenewtheiracquaintancewiththebestofrichliterarytradition.Ifwestopreadingwewillbedifferentpeoplelesscomplexlessinteresting.Therecanhardlybeabetterreasonforfightingtoprotectthefutureofthebook. 32.Whydoesdeepreadingmakeusmoreattentivetotheinnerlivesofothers A.Becausewehavevarietiesofresourcesofreading. B.Becauseweareinaworldofacceleratingtechnology. C.Becauseitwillweakentheverynatureofhumanbeings. D.Becauseanextraordinarybookmakesouroutlookbrighter. 33.Accordingtothetexttheauthorthinks. A.readingontheinternetismoreimportantandconvenientthanbooks B.weshouldfocusonthemeansofgaininginformationratherthanthecontent C.withthehelpoftheinternetpeoplecanaccessthebestofrichliterarytradition D.thewebisbetteratshapingemotionalimaginativeandhistoricalviewsthanbooks 34.Theunderlinedwordtabletsisclosesttoinmeaning. A﹣Pills B.pads C.forms D.desks. 35.Whatistheauthor'sattitudetowardsreading A.Critical. B.Objective. C.Indifferent. D.Approving.
已知抛物线y＝mx2和直线y＝﹣x+b都经过点M﹣24点O为坐标原点点P为抛物线上的动点直线y＝﹣x+b与x轴y轴分别交于AB两点． 1求mb的值 2当△PAM是以AM为底边的等腰三角形时求点P的坐标 3满足2的条件时求sin∠BOP的值．
1分IgavesomemoneytoJohnhousewasdestroyedintheflood. A.which B.what C.who D.whose
若式子在实数范围内有意义则x的取值范围是．
30分第一节完形填空 UsingpublictoiletsinChinacanoftenbeachallengingundertakingparticularlyforthosenotpracticedintheartofsittingdeep.41researchersinChinahavecomeupwithanew42thattheysaycanhelp43apoisonousproblembotheringChina'spublictoiletstheoverpoweringodor恶臭. Unlikechemicalsolutions44areexpensiveandcan45theenvironmentthenewbiotreatmentisbeingthoughtasacost﹣effectivewayofprotectingtheenvironmentto4675percentofthebadsmellinbathroomsaccordingtoresearchersfromtheChineseAcademyofSciences.The47behindthetreatmentliesinaspecial48oftwotypesofbacteria﹣﹣﹣lactobacilliussp乳杆菌类细菌andstreptococcusthermopiles嗜热链球菌﹣﹣﹣aswellastheelementsoforanges.Thepreparedmixturewhichcomesinliquidorpowderformfeedsonhumanwastewhenappliedthus49thegrowthofodor﹣makingbacteria.Howevernotyetavailablein50theodor﹣killingtechnologyisstillundergoing51.Manyexperimentswiththesolutionarebeing52intheHuanglongNaturePreserveandJiuzhaigouNationalPark. Wecanseethetechnologyisespeciallysuitedforuseinthenonflushing非冲水toiletsoftenfoundinthesetypesofnaturepreservessincewaterregulationsintheseareasareoftenvery53andpipesaredifficultto54.Portablebathroomswhile55arerelativelyexpensivetomaintaincomparedwiththebiosolution. Thisway56canseethatnotonlyareyour57nicebutthetoiletsandtheotherfacilitiesatthesitearepleasantaswellandthetechnologyhasother58aswellsuchasthetreatmentofrubbishsaidtheadministratorofJiuzhaigouNationalPark. If59toitseffectivenessprovetruethetechnologyislikelytobe60bytheChinesehealthauthorities. 41.A.Because B.If C.But D.While 42.A.technology B.way C.machine D.psychology 43.A.confirm B.analyze C.findout D.dealwith 44.A.which B.they C.that D.those 45.A.benefit B.protect C.harm D.influence 46.A.leadto B.takein C.keepout D.makeuseof 47.A.identity B.science C.instruction D.procedure 48.A.seed B.poison C.mixture D.discovery 49.A.preventing B.keeping C.causing D.forbidding 50.A.gardens B.forests C.homes D.supermarkets 51.A.discussing B.using C.testing D.analyzing 52.A.planned B.simplified C.classified D.debated 53.A.strict B.harmonious C.drafted D.canceled 54.A.polish B.twist C.make D.fix 55.A.optional B.clean C.superb D.convenient 56.A.lawyers B.tourists C.burglars D.merchants 57.A.goods B.animals C.mountains D.guides 58.A.phenomena B.disadvantages C.applications D.characteristics 59.A.results B.guesses C.doubts D.claims 60.A.accepted B.refused C.abandoned D.banned
6分DearGod NowthatIamnolongeryoungIhavefriendswhosemothershavepassedaway.Ihaveheardthesesonsanddaughterssaytheyneverfullyappreciatedtheirmothersuntilitwastoolatetotellthem. Iamblessedwiththedearmotherwhoisstillalive.Iappreciatehermoreeachday.MymotherdoesnotchangebutIdo.AsIgrowolderandwiserIrealizewhatanextraordinarypersonsheis.HowsadthatImunabletospeakthesewordsinherpresencebuttheyfloweasilyfrommypen. HowdoesadaughterbegintothankhermotherforlifeitselfForthelovepatienceandjusthardworkthatgointoraisingachildForrunningafteratoddlerforunderstandingamoodyteenagerfortoleratingacollegestudentwhoknowseverythingForwaitingforthedaywhenadaughterrealizeshowwisehermotherreallyis HowdoesagrownwomanthankamotherforcontinuingtobeamotherForbeingreadywithadvicewhenaskedorremainingsilentwhenitismostappreciatedFornotsayingItoldyousowhenshecouldhaveutteredthesewordsdozensoftimesForbeingessentiallyherself﹣﹣lovingthoughtfulpatientandforgiving Idon'tknowhowdearGodexcepttoblessherasrichlyasshedeservesandtohelpmeliveuptotheexampleshehasset.IpraythatIwilllookasgoodintheeyesofmychildrenasmymotherlooksinmine. 25.Theauthorpreferstoshowappreciationtohermother. A.totellhermotherfacetoface B.tomakeacall C.nevertotellhermother D.towriteitout 26.Accordingtothelastparagraphtheauthortendsto. A.followhermother'sexample B.prayforfriends'mother C.askGodmorequestions D.showlovetohermother 27.Whatistheauthor'spurposeofwritingthepassage A.Totellushowtoraiseachild. B.Tomemorizeherfriends'mothers. C.Tothankhermotherandbeagoodmother. D.Toexpectsomethingspecialfromherchildren.
如图一次函数y＝kx+b的图象与反比例函数y＝的图象相交于AB两点其中点A的坐标为﹣14点B的坐标为4n． 1根据图象直接写出满足kx+b＞的x的取值范围 2求这两个函数的表达式 3点P在线段AB上且S△AOPS△BOP＝12求点P的坐标．
如图1在平面直角坐标系中抛物线y＝x2+x﹣与x轴交于点AB点A在点B右侧点D为抛物线的顶点点C在y轴的正半轴上CD交x轴于点F△CAD绕点C顺时针旋转得到△CFE点A恰好旋转到点F连接BE． 1求点ABD的坐标 2求证四边形BFCE是平行四边形 3如图2过顶点D作DD1⊥x轴于点D1点P是抛物线上一动点过点P作PM⊥x轴点M为垂足使得△PAM与△DD1A相似不含全等． ①求出一个满足以上条件的点P的横坐标 ②直接回答这样的点P共有几个
求式子÷的值其中m＝﹣2019．
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