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EPR橡胶（）广泛应用于汽车部件、建筑用防水材料、电线电缆护套、耐热胶管、汽车密封件、润滑油添加剂及其它制品． PC塑料（ ）的透光性良好，可制作车、船、飞机的挡风玻璃以及眼镜等．它们的合成路...
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高三下学期化学《》真题及答案
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电力电缆是传输和分配电能的一种特殊电线广泛应用于中
电气竖井
电力系统
工矿企．
大型建筑
对于有清洁要求的工业与民用建筑应采用电缆
普通聚氯乙烯电线电缆
特种聚氯乙烯电线电缆
橡胶电线电缆
交联聚氯乙烯电线电缆
APP改性沥青防水卷材广泛应用于工业与民用建筑屋面防水及地下室工程适合我国南方高温地区使用也用于桥梁
普通电线电缆分为
普通聚氯乙烯电线电缆
交联聚氯乙烯电线电缆
橡胶电线电缆
塑胶电缆
阻燃电线电缆
已被广泛应用于民用建筑暗配管的是
半硬塑料管
硬塑料管
电线管
焊接钢管
在我国建筑防水材料的应用中处于主导地位广泛用于屋面地下和特殊构筑物防水的是
防水卷材
防水涂料
刚性防水材料
密封材料
橡胶有绝缘绝热耐寒耐酸碱等因而广泛应用于等场所
密封、防水
减振、减压
减振、密封
在橡胶电线电缆行业进行橡胶材料切割时通常采用切胶机
沥青被广泛应用于防水防腐道路工程和水工建筑中
建筑防水材料中目前应用较多的防水材料是防水材料
沥青基
橡胶基
高聚物改性沥青
树脂基
橡胶在汽车部件中使用越来越广泛
现拟对某工业建筑的消防报警及重要监测回路铺设电缆应采用
交联聚氯乙烯电线电缆
阻燃电线电缆
橡胶电线电缆
耐火电线电缆
不适用于地下客运设施.地下商业区.高层建筑和重要公共设施等 人员密集场所
橡皮电线电缆
特种聚氯乙烯电线电缆
交联聚氯乙烯电线电缆
普通聚氯乙烯电线电缆
合金结构钢广泛应用于
一般建筑材料
制造重要机械零件和工程结构
制造各种加工工具
制造通信电缆
现拟对某工业建筑的火灾自动报警及消防联动控制线路铺设电缆应采用
交联聚氯乙烯电线电缆
阻燃电线电缆
橡胶电线电缆
耐火电线电缆
根据建筑设计防火规范电线电缆可燃气体和甲乙丙类液体的管道不宜穿过建筑内的变形缝当必须穿过时应在穿过处
不燃材料
塑料
防水材料
根据建筑设计防火规范电线电缆可燃气体和甲乙丙类液体的管道不宜穿过建筑内的变形缝当必须穿过时应在穿过
不燃材料
塑料
防水材料
对于下列金属铝铜锌钛铁钙①可用来冶炼高熔点得金属是________②可用于制干电池的是_______
水平高差大和垂直敷设的场所应采用
普通聚氯乙烯电线电缆
特种聚氯乙烯电线电缆
橡胶电线电缆
交联聚氯乙烯电线电缆
棉麻塑料橡胶等广泛应用于工业生产中它们当中属于合成材料的是
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圆x2+y2＝1与直线y＝kx﹣3有公共点的充分不必要条件是
Peopledohavedifferentideasaboutwhat1wear.Whileyoungpeopletendtoconsidermoreaboutfashionpersonalityandhowtheylookwhen2chooseclotheselderlypeoplepay3greatattentiontowhethertheyappearrighttheyfeelcomfortableaswellaswhetherthematerialisworth4price.Howpeoplegetdressedalsochangesovertime.TakeChina5anexample.Inthe1960'sand1970'stherewerepracticallyonlytwoorthreecolorspeoplewore﹣bluegreenandgray.Thestylesoftheclothes6bealsoverydull.Inthe1980'syoungpeoplewouldonlywear7wasinfashion.8recentwehavecometounderstandthatthewayyoudress9youisareflectionofyouroccupationyourbackgroundandyourpersonality.Soweseedifferentpeopleweardifferentclothesaccordingtooccasionstheirlikesand10feel.
已知a＞0b＞0且ABC三点在同一条直线上则的最小值为．
已知函数fx是奇函数且fx≠0gx＝若g1＝﹣1则g﹣1等于
已知||＝2||＝1与的夹角为60°则+2﹣3的值等于
WhenIwasyoungmyfatherhadoneofthefirsttelephonesmourneighborhood.Iremembertheshinyboxonthewall.ButIwastoolittletoreachit.Icouldonlylistentomymothertalkonit.Idiscoveredthatinsidethe﹣wonderfulboxlivedanamazingpersonwhosenamewasInformationPlease.Therewasnothingshedidnotknow.Onedaymymotherwentout.IaccidentallyhurtmyfingerwhenIwasplayingwithahammer.Iwalkedaroundthehousesuckingmyfingerfinallyseeingthetelephone.QuicklyIdraggedachairoverandclimbedup.'InformationPlease'Ispokeintothereceiver.Aclickortwoandasmallclearvoicespokeintomyear.'Information.''Ihurtmyfinger'Icriedintothephone.'Isn'tyourmotherhome?'camethequestion.'Nobody'shomebutme.'Isobbed.'Areyoubleeding?'thevoiceasked.'No'Ireplied'Ihitmyfingerwiththehammerandithurts.''Canyouopenyouricebox?'sheasked.IsaidIcould.'Thentakealittlepieceoficeandholdittoyourfinger.'saidthevoice.AfterthatIcalled'InformationPlease'foreverything.IaskedherforhelpwithmygeographyandshetoldmewherePhiladelphiawas.Shehelpedmewithmymath.ShetoldmehernamewasSally.Thentherewasthetimemypetcanary金丝雀died.Icalled'InformationPlease'andtoldSallythesadstory.'Whyisitthatbirdssingsobeautifullyandbringjoytoallfamiliesonlytoendupasapileoffeathers?'Shelistenedthensaidquietly'Paulalwaysrememberthatthereareotherworldstosingin.'SomehowIfeltbetter.OnedaywhenIcalled'InformationPlease'againadifferentvoiceanswered'Information.'IaskedforSally.'Areyouafriend?'shesaid.'Yes'Ianswered.'I'msorrytohavetotellyouthis'shesaid.'Shediedfivedaysago.'BeforeIcouldhangupshesaid'Waitaminute.DidyousayyournamewasPaul?''Yes.''WellSallyleftamessageforyou.Thenotesaid‘TellhimIstillsaythereareotherworldstosingin.He'llknowwhatImean.''Ithankedherandhungup.IknewwhatSallymeant.1.Whentheauthorhurthisfingerherangbecause.A.hebelievedthatthetelephonekneweverythingB.thetelephonecouldtellhimadoctor'snumberC.hismotherwasontheotherendofthetelephoneD.hewasoncetoldtoaskforhelpinthisway2.ThroughthehelpfromSallyitcanbeinferredthat.A.SallywasageographyteacherB.Sallywastheauthor'sfriendC.SallywasaconsideratepersonD.Sallywasanimaginaryperson3.WhatdidSallyreallymeanbyhermessage?A.Shewassurethatshecouldsinginotherworlds.B.Shedidn'twantPaultobesadaboutherdeath.C.SinginghelpedPaultofacedeathmoreeasily.D.TherewasnoneedforPaultocallheranymore.4.Whatisthebesttitleforthispassage?A.MyPet'sDeathB.AnAmazingWomanC.AHealingMessageD.MyMagicBox
若函数在区间12上单调递减则实数a的取值范围为
设函数fx＝|2x+1|﹣|x﹣2|． 1求不等式fx＞2的解集 2若恒成立求实数t的取值范围．
设△ABC的三个内角ABC所对的边长分别为abc．平面向量＝cosAcosC＝ca＝2b0且•﹣＝0 1求角A的大小 2当|x|≤A时求函数fx＝sinxcosx+sinxsinx﹣的值域．
ManyofusremembercloneddinosaursrunningwildinthefilmJurassicPark.Andtheideaofusingtechnologytoreviveextinctspecieshaslongfascinatedwritersdirectorsandscientists.AccordingtoTheTelegraphwoollymammoths长毛猛玛象maywalktheearthoncemorenowthatscientistshavetakenanothersteptowardrealizingalong﹣helddream﹣recreatingtheirDNA.Mammothsbecameextinctaround10000yearsago.HoweversincethediscoveryofnearperfectpreservedremainsinArcticpermafrost北极冻土带inMay2013avarietyofresearchstudieshavebeencarriedoutsince.GeneticistsanalyzedDNAfromtheremainslookingforgeneswhichseparatedmammothsfromelephantssuchashairinessandearsize.Theythenusedtheresultstoreproduceexactcopiesof14mammothgenes.'Itisthefirsttimethatmammothgeneshavebeenalive﹣althoughsofarithasonlybeendoneinthelab'GorgeChurchleadresearcheroftheprojecttoldtheSaturdayTimes.ChurchthenusedanewtechniquewhichallowsscientiststoeditDNAcarefullyreplacingsectionsofelephantDNAwiththemammothgenes.So'wenowhavefunctioningelephantcellswithmammothDNAinthem'hesaid.HoweverChurchruledoutthepossibilityofbringingthemammothsbacktolifeviacloningfromfrozenremains.Hesaidhe'preferredtofocusonrebuildingthefullmammothgenomebyanalyzingDNAfrompreservedremainsandputtingitintothecellsofitsclosestlivingrelative﹣theAsianelephant'reportedTheTelegraph.Churcharguedthatthereturnofthewoollymammoths﹣orratherthereturnofsomethingverysimilar﹣couldhelpbringbackfragile脆弱的ecosystems.Howeversomescientistsbelievethatbringingbackthemammothwouldbeunethical.'What'sthemess?Wecanbeasirresponsiblewiththeenvironmentaswewantthenwe'lljustclonethingsback?'AlexGreenwoodanexpertonancientDNAtoldtheSundayTimes'Moneywouldbebetterspentfocusingonconservingwhatwedohavethanspendingitonananimalthathasbeenextinctforthousandsofyears.'1.Whatcanweinferfromthepassage?A.Scientificstudiesonrevivingextinctspeciesdidn'tbeginuntilMay2013.B.Thetechnologytoreviveextinctspeciesisalreadymature.C.ChurchandhiscolleaguestriedtoreproducemammothDNA.D.Churchmanagedtolistallthegenesseparatingmammothsfromelephants.2.AccordingtothetextwecouldconcludethatChurch.A.hadseriousdoubtsaboutdiscoveringthefullmammothgenome.B.aimedtoclonetheextinctmammothfromfrozenremainsonhisown.C.couldhelpsavefragileecosystemifbingingbacksomethingsimilartothemammoth.D.believetheirsuccessfulexperimentcouldchangetheAsianelephantintomammoths.3.AlexGreenwoodbelievesthat.A.itisunnecessarytoworryabouttheextinctionofAsianelephantsatpresent.B.it'snecessarytobringbackspeciesbeneficialtohumansfromextinction.C.thereturnofthewoollymammothwouldhelptobalanceecosystems.D.it'smoreimportanttoprotectpresentspeciesthantobringbackextinctones.4.What'sthebesttitleofthepassage?A.Mammothscouldreturn?B.Mammoths'returnhelpsecosystems.C.Mammothshavebeenextinctforages.D.Mammoths'clonefromfrozenremains.
若双曲线的实轴长是10则此双曲线的渐近线方程为．
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.作文中共有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.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. RecentlywehavehadadiscussionaboutthatChinashouldmakeeveryefforttodevelopingcarindustry.Opinionsdividedonthequestion. 60%ofthestudentsholdthebeliefthatChinashouldfulldevelopcarindustry.Itwillnotonlypromoteeconomicdevelopmentbutprovidesmorejobstoworkersaswell.Besidecarscanhelptosavetimeandimprovepeople'slifequality.Ontheotherhand40%thinkChinashouldlimittheircarindustrydevelopment.Otherwisethecitytrafficwillbemuchmoreheavierandmoretrafficaccidentwilloccur.Asaresultnewroadswillbebuiltbutoccupymorefarmland.
为买一双运动鞋而通宵排队有意义吗?point.
假如你是李华下周有个美国学生代表团来访学校安排你接待并带领他们参加学校内的活动体验中国剪纸艺术.请根据以下要点向他们作一个简短的介绍. 1活动的主题:福和喜二字; 2福和喜的寓意用途 3分组活动 注意:1词数100左右 2可以适当增加细节.以使行文连贯 3口头语已为你写好 Dearfriendswe'rehonoredtowelcomeyoutoourschool.Today
抛物线y2＝4x的焦点坐标是
Whetherit'sjoiningaschoolclubgoingtoafriend'sbirthdaypartyortravellingbytrainwecanmeetnewpeopleanywhereandanytimeinourlives.Howevermanyofusfeelawkwardwhenmeetingpeopleforthefirsttimeespeciallywhenwearen'tquitesurewhattosay.Thesituationfeelscoldevenicy.'Breakingtheice'isatermwidelyusedintheEnglish﹣speakingcountriestodescribeasmalltalktechniquethatcanhelprescueaconversationfromcertainfailure.Sowheredoyouevenbegin?Wellagoodstartistoacceptthatitisperfectlynormaltofeelalittlenervouswhentalkingtosomeoneforthefirsttime.Theymightlookgrumpyorscarybuttheycouldturnouttobethenicestpersonyou'veevermet.Youmightthinkthatbreakingtheiceisdifficult.Butsometimesjustasimple'hello'followedbyathree﹣secondsmilecanmakeallthedifference.Complimentingsomeoneontheirgarmentoraccessories饰品isalsoagreateasywaytobreaktheice.Youmightsay:'Iloveyourjacket.Wheredidyoubuyitfrom?'Beinginanuncomfortableorunpleasantsituationwithsomeonenewmightfeelterriblebutitcanactuallybeoneofthebesticebreakers.Byfocusingonthesituationyoucometogethertofightthecommonenemy:thelongbathroomqueueforexampleortheovercrowdedbus.Youcanmakeobservationstoo.'Whatkindofdrinkisthat?''That'salovelyname.Whatdoesitmean?''Doyoustudyheretoo?'Thereareopportunitiesallaroundyoutoaskquestionsthatdon'tseemweirdaslongasyouhavesomefollow﹣upquestionsinmind.Ifyou'refeelingextraboldmakeajoke.Jokescanbedifficulttomasterbutifyougetthemrighttheyshowthelikeablewittysideofyourcharacter.'What'syourname?''WellpeopleusuallycallmeMikebutyoucancallmetonight.'1.Whichisthebesttitleforthepassage?A.HowtodevelopfriendshipwithastrangerB.AdviceonbreakingtheicewhenwecommunicatewithastrangerC.HowtobecomeasuccessfulpublicspeakerD.Howtostartaconversationwithaperson2.Theunderlinedword'grumpy'canbereplacedby.A.easilyannoyedB.gentleC.low﹣spiritedD.cheerful3.Whatcanwelearnfromthepassage?A.'Breakingtheice'isasmalltalktechniquewidelyusedinourdailycommunicationallovertheworld.B.Aslongasyoucansmileatothersyouwillmakesomefriends.C.Realizingthatit'snormaltofeelnervousinfrontofastrangerisagoodstarttobreaktheice.D.Beinginanuncomfortablesituationwithsomestrangerscanbethebesticebreakers.4.Accordingtothepassagemakingajoke.A.canbedonewithease.B.leadstomanynewfriends.C.canshowyourwisdomandlovelycharacter.D.makesyouenjoyyourlifehappily.
设向量＝﹣12＝m1若向量与2平行则m＝
已知复数为纯虚数其中i是虚数单位a为实数则a的值为
Advancesinhealtheducationanddiseasepreventionandtreatmentsaremakinghumanlifelonger.Butwhatyoumaynotknowisthatsomeseeminglyunimportantthingscanalsoinfluencehowlongandhowwellyou'lllive.Hereisthelatestresearchonlongevitysigns.Sign1:YourMomHadYouYoungIfshewasunderage25you'retwiceaslikelytoliveto100assomeoneborntoanoldermom.Theythinkthatyoungermomsproducehealthierbabies.Sign2:You'reaTeaLoverBothgreenteaandblackteacontaincatechins儿茶酚somethingthathelpsbloodvessels血管relaxandprotectsyourheart.Sign3:You'dRatherWalk'Fit'people﹣definedasthosewhowalkforabout30minutesaday﹣aremorelikelytolivelongerthanthosewhowalkless.Sotakeawalkduringyourlunchhourdoexercisearoundthefieldwhileyourkidisatsoccerpractice﹣trybyhookorbycrooktomovealittlemoreeveryday.Sign4:YouHaveStrongLegsLower﹣bodystrengthtranslatesintogoodbalanceflexibilityandpowerwhichasyougetolderplayanimportantpartinreducingyourriskoffallsandinjuriesleadingtobetterhealth.Nowyouseeitisnecessarytostrengthenyourlower﹣body.Butthequestionis:how?1.WhichofthefollowingisTRUE?A.Greenteacontainsmorecatechinsthanblacktea.B.Generallytheyoungerthemomsthehealthierthebabies.C.Themoreyouwalkthelongeryoulive.D.Low﹣bodystrengthisthemostimportantfactorforlongevity.2.Theunderlinedphraseisclosestinmeaningto''.A.tryanypossiblemeansB.usesometoolsC.choosecarefullyD.Workoutnewways3.Accordingtothetextyourlongevityisaffectedbythingssuchas.a.lower﹣bodystrengthb.diseasetreatmentsc.yourmom'saged.livinghabitsA.abcB.acdC.abdD.bcd4.Whatisthepassagemainlyabout?A.Howadvancedsciencehelpspeoplelivelonger.B.Howwomengivebirthtohealthybabies.C.Signsthattellyouyourhealthcondition.D.Thenewdiscoveriesoflongevitysigns.
设函数fx＝﹣a2lnx+x2﹣axa∈R． 1试讨论函数fx的单调性 2如果a＞0且关于x的方程fx＝m有两解x1x2x1＜x2证明x1+x2＞2a．
已知点M的坐标xy满足不等式组N为直线y＝﹣2x+3上任一点则|MN|的最小值是
It'sthetimeofyearwhengraduatesarelookingforwardtoputtingconstantexamsbehindandmovingontoamoreexcitingstageoftheirlives.Butinthedigitalagenoteverythingissoeasilyleftbehindbecausetheyhavecreatedadigitalfootprintthat'softennoteasytocoverup.Howevertherearevariousactionstheycantaketomakethatonlinepresence网络形象moreappreciating.1CleanupyourFacebookaccountCleanupyourFacebookpageandgetridofanythingthatcouldbeconsideredoffensive冒犯的无礼的orheldagainstyou.Rememberthetestisnolonger'Wouldyouwantgrandmatoseeit?'but'2'Useaprofessionallookingphoto3somakesurethatfirstimpressionisagoodone.Againwhatworkedatschoolisunlikelytoimpresstheemployers.Alsobeconsistent一致的andusethesamephotoonallyouronlineplatforms.4Whileit'simportanttomakethetransition过渡fromschooltotheworkplaceyoudon'twanttoleaveeverythingbehind.Makeapointofkeepingintouchwithyourschoolfriendsteachersprofessorssportscoachesoranyonewhocouldbehelpfultoyouasyouestablishacareer.BeyourselfNobodycanbemorelikeyouthanyou.5Turnyoursocialnetworkingpagesintoyourownpersonalwebsiteandstartmarketingyourownindividualbrand!A.GrowyournetworkB.SearchyourmemoryC.ApictureisworthathousandwordsD.Whomwouldyouwanttoseeit?E.Wouldyouwantafutureemployertoseeit?F.Makesureyouronlinepresenceisrepresentativeofwhoyoureallyare.G.Hereareafewsuggestionsthatyoumightwanttopasson.
变量xy之间的一组相关数据如表所示 若xy之间的线性回归方程为＝x+12.28则的值为
若函数为奇函数则实数a＝．
若则|z|＝
我阿姨苦读四年之后获得了文凭那一刻她欣喜万分.Themoment….
在等比数列{an}中“a4a12是方程x2+3x+1＝0的两根”是“＝1”的
ItwasthesecondtimethatIhavebeentothehospital.1itwasaweekdaytherewerestilllotsofpeopletherewhich2meatfirst.Mostofuslivehealthylivessoperhapsweneverrealizethattherearesomanypeople3painandtorment.AsIwalkedalongthehallwayIsawavarietyofpeopleandfeltmanythings4throughmymind.Iheardasmalllaughofjoyand5myheadtoseewhathadhappened.Awomanwasstandinginthehallwaysayingtoherhusbandbeside:'6isokay!Yourbabyismovingaroundlikealwaysinmybelly肚子.'Themansmiledandsaid:'Ourchildmusthavea7likemine.'Theysmiledateachotherandwalked8away.Asmallnew9makessomanypeoplesohappy.Iwas10whymyparentsalwayslookedso11whenItoldthemthatIfeltunwell.Parents12theirchildren'slivesmoredearlythantheirown.Anothernoise.Iheardanursesay:'Weare13theoperation.Don'tworry.'AnoperationissomethingthatIhavefearedeversince14.Ifearthe15ofit.Ifanoperationis16everybodyishappy.Butifnottheworldseemsto17.Afterallweknowthepeoplearounduswillleaveourworld18.Facingtheforcesoflifeanddeathweareas19asdropsofwaterinanoceanonlytheretobepushedbackandforth.Ifeltmyself20inthatexactmomentandplaceinmydeepestthoughts.1.A.As B.Because C.Although D.When2.A.frightened B.excited C.worried D.surprised3.A.goingfor B.goingthrough C.goingover D.goinginto4.A.flash B.appear C.form D.fly5.A.held B.raised C.rose D.kept6.A.Nothing B.Something C.Anything D.Everything7.A.hobby B.behavior C.character D.movement8.A.quietly B.happily C.sadly D.hurriedly9.A.life B.boy C.daughter D.person10.A.realized B.told C.recognized D.reminded11.A.down B.unhappy C.worried D.nervous12.A.see B.treat C.look D.think13.A.getting B.experiencing C.doing D.carrying14.A.childhood B.fatherhood C.adulthood D.neighborhood15.A.danger B.failure C.certainty D.uncertainty16.A.good B.successful C.quick D.easy17.A.darken B.change C.brighten D.stop18.A.early B.temporally C.permanently D.quickly19.A.abundant B.important C.necessary D.unimportant20.A.growup B.riseup C.growold D.growcrazy
函数fx＝sinωx+φω＞0|φ|＜的部分图象如图所示将y＝fx的图象向右平移个单位长度后得到函数y＝gx的图象． 1求函数y＝gx的解析式 2在△ABC中角ABC满足2sin2＝gC++1且其外接圆的半径R＝2求△ABC的面积的最大值．
圆x2+y2﹣2x﹣8y+13＝0的圆心到直线ax+y﹣1＝0的距离为1则a＝
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