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为区別N2、H2、CO2、CH4四种气体,小丽进行了下面实验: ①点燃四种气体,将气体分为可燃性气体和不可燃性气体; ②在可燃性气体火焰上方,分別罩一内壁附有澄清石灰水的烧杯,烧杯内壁出现白色浑...
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H2、CO2、C2H6、CH4、CO
H2、CO、C2H6、CH4、CO2
H2、CO2、CH4、C2H6、CO
H2、CO2、CH4、CO
高炉冶炼过程的还原剂有
CO2、CH4、H2
CO、CH4、H2
CO、CO2、H2
CO、H2
判断变压器内部故障有价值的气体如下写出它们的名称H2COCO2CH4C2H2C2H4C2H6
燃料中的挥发物质随温度不断升高而挥发出来这些气体大部分是可燃的如 COH2CH4H2S等只有少部分是
由上到下煤层瓦斯沿垂向所分的四个带是
“N2”、“N2-CO2”、“N2-CH4”、“CH4”;
“CH4”、“N2-CH4”、“N2-CO2”、“N2”;
“N2-CO2”、“N2”、“N2-CH4”、“CH4”;
“CH4”、“N2-CH4”、“N2”、“N2-CO2”。
高炉煤气中可燃气体有
CO、H2、CH4;
CO、H2、N2;
CO、CO2、N2;
CO2、H2、N2。
加热焦炉用的焦炉煤气的中含有H2COCH4CO2N2O2等
净煤气是
煤气净化的主要产品,含有 H2、CH4、CO、CmHm。等可燃气体
其组成由炼焦温度和煤料性质决定,含有 N2、CO2、O2等的非可燃气体的混合物
经回收化学产品及脱除杂质处理的粗煤气
干煤气、水蒸气及一系列化学产品和少量杂质组成的复杂混合物
当前环境问题是一个全球重视的问题引起环境问题的气体常见的有温室气体CO2污染性气体NOxSOx等如果
干熄焦循环气体的主要成分为N2其他成分还有H2CH4CO等气体其中属于不可燃组分是
N2
H2
CH4
CO
乙炔用以下气体稀释后爆炸能力会降低如N211时CH4甲烷CO2COH2O水蒸气等效果最好是
N2
CO2
H2O
计算1pH=13的氢氧化钠与pH=10的氢氧化钡溶液按体积比11100混合后pH=_________
原铝中的气体杂质主要有H2CO2CON2其中以__________为主
特征气体组分CH4/H2=0.8时CH4/H2比值编码为
1
2
-1
特征气体组分CH4/H2≥3时CH4/H2比值编码为
1
2
3
瓦斯是由多种成分组成的混合气体包括甲烷CH4氮N2二氧化碳CO2硫化氢H2S一氧化碳CO等
一定条件下用甲烷可以消除氮氧化物NOx的污染已知①CH4g+4NO2g=4NOg+CO2g+2H2O
CH4 (g)+2NO2 (g)= N2 (g)+CO2 (g)+2H2O (l) △H.=-867 kJ·mol-1
若0.2 mol CH4还原NO2至N2,在上述条件下放出的热量为173.4 kJ
1molCH4催化还原NOx为N2的过程中,若x=1.6,则转移的电子为3.2 mol
若用4.48L CH4还原NO2至N2,整个过程中转移的电子为3.2 mol
按在甲醇中溶解度从小到大排列CH4COSCO2N2HCNCONH3H2SH2
在同温同压下等质量的CO2H2HClCH4所占体积最大的是HCl
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解不等式组
计算20190+﹣1=.
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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
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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
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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.
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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