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如图,a∥b,若∠1=110°,则∠2的度数是( )
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如图1梯子的各条横档互相平行若∠1=70o则∠2的度数是
80
o
110
o
120
o
140
o
如图直线a∥b一块含60°角的直角三角板ABC∠
=60°)按如图所示放置.若∠1=55°,则∠2的度数为( )
A.105°
110°
115°
120°
如图直线a∥b一块含60°角的直角三角板ABC∠
=60°)按如图所示放置.若∠1=55°,则∠2的度数为( )
A.105°
110°
115°
120°
如图∠BAC=110°若MP和NQ分别垂直平分AB和AC则∠PAQ的度数是__________.
如图△ABE.△ADC和△ABC分别是关于ABAC边所在直线的轴对称图形若∠1∠2∠3=721则∠α
90°
108°
110°
126°
如图直线m∥n△ABC的顶点B.C.分别在nm上且∠C.=90°若∠1=40°则∠2的度数为
130°
120°
110°
100°
如图AB∥CD射线AE交CD于点F.若∠2=110°则∠1的度数是
80°
70°
60°
50°
如图梯子的各条横档互相平行若∠1=80°则∠2的度数是.
80°
100°
110°
120°
如图10梯子的各条横档互相平行若∠1=70o则∠2的度数是
80
o
110
o
120
o
140
o
如图直线l1∥l2且分别与△ABC的两边AB.AC相交若∠
=45°, ∠1=65°,则∠2的度数为 A.45°
65°
70°
110°
如图直线m∥n△ABC的顶点B.C.分别在直线nm上且∠ACB=90°若∠1=40°则∠2的度数为
140°
130°
120°
110°
如图直线m∥n△ABC的顶点B.C.分别在直线nm上且∠ACB=90°若∠1=40°则∠2的度数为
140°
130°
120°
110°
如图直线a∥b一块含60°角的直角三角板ABC∠A=60°按如图所示放置.若∠1=55°则∠2的度数
105°
110°
115°
120°
如图已知a∥b小华把三角板的直角顶点放在直线b上.若∠1=40°则∠2的度数为
100°
110°
120°
130°
如图∠1+∠2=180°∠3=110°则∠4度数
等于∠1
110°
70°
不能确定
如图四边形ABCD内接于⊙O.E.为CD延长线上一点若∠ADE=110°则∠AOC的度数是
70°
110°
140°
160°
如图△ABE.△ADC和△ABC分别是关于ABAC边所在直线的轴对称图形若∠1∠2∠3=721则∠α
90°
108°
110°
126°
如图直线a∥b若∠1=47°∠2=53°则∠3的度数为
80º
90º
100º
110º
如图点D.在BC上AB=AD∠C.=∠E.∠BAD=∠CAE若∠1+∠2=110°则∠ABC的度数是
将一把直尺与一块三角板如图所示放置若∠1=40°则∠2的度数为
50°
110°
130°
150°
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氧化白藜芦醇W具有抗病毒等作用.下面是利用Heck反应合成W的一种方法 回答下列问题 1A的化学名称为. 2中的官能团名称是. 3反应③的类型为W的分子式为. 4不同条件对反应④产率的影响如下表 上述实验探究了和对反应产率的影响.此外还可以进一步探究等对反应产率的影响. 5X为D的同分异构体写出满足如下条件的X的结构简式. ①含有苯环②有三种不同化学环境的氢个数比为621③1mol的X与足量金属Na反应可生成2gH2. 6利用Heck反应由苯和溴乙烷为原料制备写出合成路线.无机试剂任选
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Asmartphone'slowbatterywarningistheonlywarningthatmostpeopletakeseriously.Trythefollowingstepsandyouwillimproveyourbatterylife. Lettherebelesslight Forlargersmartphonesthelongerthescreenisonandthebrighteritisthefasteryourbatterygoes.Trymakingthescreenasdarkasyoucanbearitandstillreadatext.DarkeningthescreeniscommonamongteenagersbutitmaybehardforMomandDadtoseewhat'sshowingontheirphone. Turnoffthesignals Yoursmartphonedoesalotofcommunicatinginthebackground.They'recheckingforthingslikenewemailstextmessagesWi﹣FisignalsBluetoothsignalsyourlocationandmore.Theseactivitiesdodrainyourbatterylifesoyoushouldturnoffwhateveryouaren'tusing.LocationServicesisalsoanotherfeaturethatburnsupyourbatterysoyoucanuseGPSandWi﹣FitofindoutwhichappshaveaccesstoLocationServicesandturnthemoff. Turnoffnotifications通告 AnotherwaytoimprovebatterylifeistostoptheconstantflowofnotificationsandupdatesfromFacebookemailgamesandsites.Yourphonewillautomaticallypickupthesenotificationswhenit'sconnectedtotheInternetandtheycanhaveanoticeableimpactonbatterylife. Usebatterysavingmode模式 ForaquickwaytoimproveyourbatterysimplyputyoursmartphoneinAirplaneMode.IfAirplaneModeistoolimitingsomephoneshaveaspecificbatterysavermode.ThisshutsdownunimportantfunctionsandappslikeWi﹣Fisomeupdatesandmore. Ifusedproperlythesetipsabovewillimproveyourbatterylifeupto30percent. 1Theunderlinedworddrainmeans. A.lightup B.useup C.pickup D.makeup 2Ifyouwanttoimproveyourbatterylifeyouareadvisedtousea. A.smallscreen B.largescreen C.brightscreen D.roundscreen 3Wecaninferthatagedpeopletendto. A.emailfamilymembers B.useLocationServices C.darkenthescreen D.brightenthescreen 4WecanlearnthatAirplaneModecan. A.improvesignals B.wasteenergy C.affecthealth D.savepower
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连二亚硫酸钠Na2S2O4•2H2O俗称保险粉易溶于水常用于印染纸张漂白等.回答下列问题 1Na2S2O4中S的化合价为. 2向锌粉的悬浮液中通入SO2制备ZnS2O4生成1molZnS2O4反应中转移的电子数为mol向ZnS2O4溶液中加入适量Na2CO3生成Na2S2O4并有沉淀产生该反应的化学方程式为 3Li﹣SO2电池具有高输出功率的优点.其正极为可吸附SO2的多孔碳电极负极为金属锂电解液为溶解有LiBr的碳酸丙烯酯﹣乙腈溶液.电池放电时正极上发生的电极反应为2SO2+2e﹣═S2O42﹣电池总反应式为.该电池不可用水替代混合有机溶剂其原因是.
Thereisnodoubtthatlosingweightismuchharderthangainingit.Sohowdoesonegoaboutthedifficulttaskofsheddingthoseextrapounds1Thetipsandideaspresentedtoyouherearemeanttobetheextrainformationyouneedtohelpyoutogetstartedoffontherightfoot. 2Ifyoureallylikepastatherearehealthyoptionsavailabletoyou.Youcanreplaceregularpastanoodleswithnoodlesthataremadewithwholewheat.Usingwholewheatpastatendstobemorefillingthanregularpasta. 3Studiesshowthatthosewhoexercisenotonlyloseweightbutkeepitoffmoresuccessfullythanthosewhodon'texercise.Exercisewillhelpraiseyourmetabolic新陈代谢rateandcreateacaloriedeficitwhichhelpstheweightcomeoffquicker.Keepmovingtokeeptheweightoff. Cutyourjuicewithhalfwaterorclubsoda.4Ifyoucancuttheminhalfwithsomethingelseyouwilleliminatealargenumberofemptycaloriesandsugarfromyourdiet.Thiscanhelpyoutoloseafewpounds. Youmaythinkthatyouaregoingtobenefitbyskippingamealhereandtherebutinallhonestyyouwillnot.5Itwillmakeitmuchharderforyoutoburnoffthecaloriesfromthefoodthatwasinyourbodyfromthepreviousmeal. A.Exercisewillhelpyouloseweight. B.Gettobedveryearlyforafullweek. C.Formostitcanbehardtofindastartingpoint. D.Whenyouaretryingtoloseweightpastacanbeabadthing. E.Tryeatingacherrytomatooutofyourpartner'snaveltonight! F.Manyjuicesarefilledwithsugarandcaloriesthatyoudon'tneed. G.Skippingmealswillcauseyourbodytogointoamodeforfat﹣storing.
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近年来随着聚酯工业的快速发展氯气的需求量和氯化氢的产出量也随之迅速增长.因此将氯化氢转化为氯气的技术成为科学研究的热点.回答下列问题 1Deacon发明的直接氧化法为4HClg+O2g═2Cl2g+2H2Og.如图为刚性容器中进料浓度比cHClcO2分别等于114171时HCl平衡转化率随温度变化的关系 可知反应平衡常数K300℃K400℃填“大于”或“小于”.设HCl初始浓度为c0根据进料浓度比cHClcO2=11的数据计算K400℃=列出计算式.按化学计量比进料可以保持反应物高转化率同时降低产物分离的能耗.进料浓度比cHClcO2过低过高的不利影响分别是. 2Deacon直接氧化法可按下列催化过程进行 CuCl2s═CuCls+Cl2g△H1=83kJ•mol﹣1 CuCls+O2g═CuOs+Cl2g△H2=﹣20kJ•mol﹣1 CuOs+2HClg═CuCl2s+H2Og△H3=﹣121kJ•mol﹣1 则4HClg+O2g═2Cl2g+2H2Og的△H=kJ•mol﹣1. 3在一定温度的条件下进一步提高HCl的转化率的方法是.写出2种 4在传统的电解氯化氢回收氯气技术的基础上科学家最近采用碳基电极材料设计了一种新的工艺方案主要包括电化学过程和化学过程如图所示 负极区发生的反应有写反应方程式.电路中转移1mol电子需消耗氧气L标准状况.
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WhenIwassevenyearsoldmyfamilygrewourfirstsquarewatermelon.Noone1seeasquarewatermelonbeforesoitbecamefamousinstantly.Peoplevisitedourgardentosee2unusualfruit.What'ssogreataboutsquarewatermelons?Wellbesidestheir3usualshapethemelonspilenicelyfitintherefrigeratorandwon'trolloffthetable. Wheneverpeopleask4theycangrowtheirownsquarewatermelonsmydadtellsthemtousesquareseeds.Truthfullythoughmydaddiscoveredthekey5squarefruitbyaccident. Wehaveasmallvegetablegarden6weplantwatermelonseverysummer.Theyoungmelonswereplacedoncinderblocks空心砖tokeepthemfromrottingonthewetground.In1996wewenttoLondonforvacation.Whenwereturnedweekslaterweweresurprised7findayoungmelonstuckinthecentreofacinderblock.Thewatermelonhadgrowninsidetheblockuntil8wassqueezedtootightlytoremove. Wedidn'twanttokillitsowejustleftittheremyfatherremembers.9surprisewhenwebrokethecinderblockatharvesttimewefoundaperfectlyhealthymelon﹣butitwasalsoperfectlysquare.Sincethatsummermyfamilyhasbeengrowingsquarewatermelonsonpurposebecausetheyarealwayswell10receive.
Asingle10﹣secondkisscantransferasmanyas80millionbacteriaaccordingtoDutchscientists. Theymonitoredthekissingbehaviorof21couplesandfoundthosewhokissedninetimesadayweremostlikelytosharesalivarybugs唾液细菌. Studiessuggestthemouthishometomorethan700differenttypesofbacteria﹣butthereportrevealssomeareexchangedmoreeasilythanothers. TheresearchispublishedinthejournalMicrobiome微生物组.AteamfromtheNetherlandsOrganizationforAppliedScientificResearchTNOaskedthecouplesaseriesofquestionstoassesstheirkissinghabitsincludinghowfrequentlytheyhadkissedinthelastyearandwhentheylastlockedlips. Scientiststookbacterialsamplesfromthevolunteers'tonguesandsalivabeforeandafterastrictlytimed10﹣secondkiss.Onememberofthecouplesthendrankaprobiotic益生菌drinkcontaininganeasilyidentifiablemixtureofbugs.Onthecouple'ssecondkissscientistswereabletodetectthevolumeofbacteriatransferredtotheotherpartner﹣onaverage80millionbacteriainasingle10﹣secondkiss.Butwhilebacteriainthesalivaseemedtochangequicklyinresponsetoakissbugpopulationsonthetongueremainedmorestable. ProfRemcoKortwholedtheresearchsaidFrenchkissingisagreatexampleofexposuretoagigantic巨大的numberofbacteriainashorttime. Thesetypesofinvestigationsmayhelpusdesignfuturebacterialtherapiesandhelppeoplewithtroublesomebacterialproblems. Agrowingnumberorresearchersarelookingatthemicrobiome﹣anecosystemofsome100trillionmicro﹣organismsthatliveinandonourbodies.Scientistssaythesepopulationsmaybeessentialforhealthandthepreventionofdisease. 1Accordingtothepassagebacteiacanbeexchangedduringakissthrough. A.saliva B.tongues C.lips D.breath 2Whydidthescientistshaveoneofthecouplesdrinkaprobioticdrink? A.Becausetheywanttoobservetheresponseoftheirbodies. B.Becausetheyintendtoprotectthebacteriainthecouples'mouths C.Becausetheywanttodetectthevolumeofthetransferredbacteria. D.Becausetheywanttokeepabalancedenvironmentinthecouples'bodies. 3What'sthepurposeoftheresearch? A.Toguidehealthykiss. B.Tolimitthetimesofkissing. C.Toavoidkissingdifferentpeople. D.Tohelpdesignfuturebacteriatherapies. 4Wecanlearnfromthepassagethat. A.Frenchkissingshouldbeadvocated B.weneedtolocklipswhenkissingifweloveher/him C.theexchangedbacteriathroughkissingdogreatharmtotheother D.someofthemicrobiomemaybeessentialforhealththoughexchangedduringakiss
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如图 1按21的比画出三角形变化后的图形. 2按13的比画出圆变化后的图形并与原来的圆组成轴对称图形. 3按21的比画出平行四边形变化后的图形
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由γ﹣羟基丁酸生成γ﹣丁内酯的反应如下 在298K下γ﹣羟基丁酸水溶液的初始浓度为0.180mol•L﹣1测得γ﹣丁内酯的浓度随时间变化的数据如表所示.回答下列问题 1该反应在50~80min内的平均反应速率为mol•L﹣1•min﹣1. 2120min时γ﹣羟基丁酸的转化率为. 3298K时该反应的平衡常数K=. 4为提高γ﹣羟基丁酸的平衡转化率除适当控制反应温度外还可采取的措施是
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