首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
单晶硅是信息产业中重要的基础材料．通常用炭在高温下还原二氧化硅制得粗硅（含铁、铝、硼、磷等杂质），粗硅与氯气反应生成四氯化硅（反应温度450～500℃），四氯化硅经提纯后用氢气还原可得高纯硅．以下是...
查看本题答案
包含此试题的试卷
高三下学期化学《》真题及答案
点击查看
你可能感兴趣的试题
单晶硅是制作电子集成电路的基础材料工业上通过一下反应将自然界的二氧化硅SiO2转化为硅SiO2+2C
二氧化硅发生了还原反应
碳发生了还原反应
该反应属于分解反应
该反应属于化合反应
目前实行大规模产业化的晶体硅光伏电池包括单晶硅光伏电池
关于硅材料的下列说法正确的是
二氧化硅广泛应用丁光纤通讯
上艺师利用盐酸刻蚀石英制作艺术品
水晶项链和餐桌上的瓷盘都是硅酸盐制品
粗硅制备单晶硅不涉及氧化还原反应
单晶硅生长常用和两种生长方式生长后的单晶硅被称为
下列说法正确的是
二氧化硅广泛应用于光导纤维通讯
工艺师利用盐酸刻蚀石英制作艺术品
石英和餐桌上的瓷盘都是硅酸盐制品
粗硅制备单晶硅不涉及氧化还原反应
在生产过程中必须使用来完成浅沟槽隔离STI
单晶硅刻蚀
多晶硅刻蚀
二氧化硅刻蚀
氮化硅刻蚀
单晶硅是信息产业中的重要基础材料下列硅及其化合物的说法正确的是①硅是构成一些岩石和矿物的基本元素②水
①③⑤
①②④
③④⑤
①④⑤
硅是重要的半导体材料构成了现代电子工业的基础回答下列问题⑴获取知识和信息是现代人不可缺少的素质信息产
可采用二氧化硅和碳作为原材料在大型电弧炉中进行冶炼获得的硅材料是
单晶硅
多晶硅
冶金级硅
非晶硅
1制造普通玻璃的主要化学反应有2盛放碱液的试剂瓶不能用玻璃塞是为了防止发生反应以NaOH为例用化学方
下列说法正确的是
二氧化硅广泛用于光纤通讯
工艺师利用盐酸刻蚀石英制作艺术品
水晶项链和餐桌上的瓷盘都是硅酸盐制品
粗硅制备单晶硅不涉及氧化还原反应
硅及其化合物的应用范围很广下列说法正确的是
粗硅制备单晶硅不涉及氧化还原反应
反应：Si＋2NaOH＋H
2
O===Na
2
SiO
3
＋2H
2
↑中，Si为还原剂，NaOH和H
2
O为氧化剂
硅是人类将太阳能转换为电能的常用材料
硅能与氢氟酸反应，则硅可以与盐酸反应
高纯度的单质硅是信息产业的核心材料没有硅就没有你喜欢的计算机如图是高纯度的单晶硅地壳中含有大量的硅元
晶体硅Si是一种重要的半导体材料冶炼硅时常用碳在高温下还原二氧化硅制得粗硅反应的化学方程式是SiO2
简述单晶硅与多晶硅的材料对比
高纯的单晶硅是重要的半导体材料制备高纯硅的化学方程式为SiCl4+2H2高温Si+4HCl请计算要获
下列关于硅和硅的化合物叙述不正确的是①硅晶体的结构和金刚石相似②硅是地壳中含量最多的元素③单晶硅是良
①②③
①⑤⑥
③④⑤
②⑤⑥
是将熔融后的多晶硅与单晶硅的结晶进行接触边缓慢旋转提拉使结晶生长最后得到长棒形状的单晶硅
直拉法
铸锭法
西门子法
三氯氢硅还原法
常用的EJA压力变送器就属于单晶硅谐振式压力变送器.
以等两层材料所组合而成的导电层便称为Polycide
单晶硅
多晶硅
硅化金属
二氧化硅
氮化硅
热门试题
更多
设fx为定义在R上的奇函数当x≥0时fx＝2x+2x+bb为常数则f﹣1＝
Howtohelpawheelchairuserintoachair Ifyou'relookingaftersomeonewhousesawheelchairknowingthecorrectwaytoassisthiminDtoandoutofhischaircanbequiteimportant．1Soit'snecessarytounderstandhowtolendahandsafelybeforeyouattempttodoso． 1．Preparethechair． It'scrucialtoensurethatthechairisreadyforthepersontositinbeforeyoubegintomovehim．Nevertrytoadjustthechairwhenyou'realreadybearingaperson'sweight．Insteadensurethatthechairisintherightpositionbeforeyoustart．2 2．Liftsafely． Beforeyoucanhelpawheelchairuserintoachairyouneedtobeawareofseveralfactorsaswellasthecorrectwaytoliftthechairuser．Makesureyouknowhowheavyyourfriendorfamilymemberisandthatyou'restrongenoughtolifthimtositsafelyinthechair．3Yourclothingandfootwearisalsoimportant．Ensurethereisnothingyou'rewearingthatcouldcatchandthatyourshoesallowcompletestability． 3．4 Loweryourfriendorfamilymemberintothewheelchairslowlyandsteadilymakingsuretheyarefullyseatedinthechair．Iftheyareabletostandandlowerthemselvesintothechairstandbehinditandholdontothehandlestomakesureitdoesn'tmove．5Beforemovingthewheelchairaskthemtoplacetheirhandsintheirlapormoreimportantlyawayfromthewheelssothattheycanfeelcomfortable． Aboveallcheckthatthepersonyouareassistingiscalmandrelaxedandhappytoreceivehelp． A．Makethemcomfortable． B．Rememberloleavethewheelchairbehind． C．Youshouldheinanareawithnoobstaclesintheway． D．Makesureyoucanhaveafreetalkwiththewheelchairuser． E．Notknowingtherighttechniquescanresultininjurytothewheelchairuser． F．Oncetheyareseatedswingthefootrestsbackintoplacemindingtheirlegs． G．Mostimportantlymakesurethewheelchairbrakesareonandthatthechairistotallystable．
在三棱柱ABC﹣A1B1C1中AC＝BC＝2∠ACB＝120°D为A1B1的中点． 1证明A1C∥平面BC1D 2若A1A＝A1C点A1在平面ABC的射影在AC上且BC与平面BC1D所成角的正弦值为求三棱柱ABC﹣A1B1C1的高．
在数列{an}中a2＝5a5＝2且2an+1﹣an+2＝ann∈N*则|a1|+|a2|+……+|a10|的值是
已知函数fx＝则flog25＝
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．错误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．ItwasattheGreenStorethatIfindabrokenrockingchairandputitinbackofmytruck．Theseatwassplitintotwofromfronttoback．Otherthanthatitwasinexcellentlycondition．IthoughtIshouldrepairitsothatbythefollowingdayitwouldbesogoodasanewone．BySundayafternoonthegluehadsetandaftertwocoatofbrightwhitepaintthechairwasofperfect．IwasexcitingbecauseIwasgoingtosurprisemywife．Wewerenewparenttoabeautifulbabyboy．Ournewbabylovedtoberockedbutwedidn5thaveaproperrockingchair．Thischairwasbeautifulandhiswifewasveryhappywithit．
设全集U＝R集合A＝{x|log2x≤1}B＝{x|x2+x﹣2≥0}则A∩∁UB＝
若xy满足则z＝y﹣2x的最大值为
下列函数中值域是0+∞的是
PizzaisaprettycommontreatbutwherediditstartHerearethreethingsyouprobablydon'tknowaboutpizza． 1Pizza'sOriginsAreHalf﹣Baked． TheNeapolitansinItalyareproudofsayingtheyinventedpizzabutit'sprobablymoreaccuratetosaytheyperfectedit．Theideaofputtingtoppingsonaflatbreadandbakingitstartedinthe6thcenturyB．C．ButthepeopleofNapleswerethefirsttoputthetomatoonaflatbreadinthe16thcentury．Fromitsstartpizzawasthefoodforthepoorasitwascheapfillingandeasytoeatontherun．InItalianthewordpizzareferstoanythingthatismadeandthenpressedflat． 2PizzaMargheritaIsNotExactlyaSymbolofItaly． Itissaidthatonedayin1889alocalbakernamedRaffaeleEspositocreatedthreepizzasforQueenMargheritawhenshewasonatourofItaly．ThequeenlovedtheversionthathadthetomatobasilandmozzarellacheeseanditjusthappenedtomatchthecolorsoftheItalianflag．SoEspositonamedthepizzaafterher． ButScottWienerpointsoutthatItalywasunifiedinnameonlyin1889soitwasunlikelyanyNeapolitanbakerwouldwanttocelebratetheNorthernconquerorFurthertheletterofgratitudeforthepizzafromtheroyalhouseholdthatPizzeriaBrandidisplaysappearstobeafakeandmayjusthavebeenamarketingstrategy． 3HawaiianPizzaInventedbyaCanadian． SamPanopoulosfromGreeceoriginallymovedtoCanadaattheageof20．In1962hedecidedtoputsomehamandpineappleonapizzaatoneofhisrestaurantsinOntario． WejustdiditforfuntoseehowitwasgoingtotastehetoldtheBBCin2017．PanopoulosnamedittheHawaiianpizzaafterthebrandofthecannedpineappleheused．Themixtureofsweetandsavorytoppingsbecamepopularwithacertainpartofthepizza﹣lovingpublic．Theinventordiedin2017． 1Whowaspizzafirstmadefor A．Peoplewhowereverybusy． B．Peoplewhowererunningaway． C．Thepoorpeoplewhocouldaffordit． D．Soldiers． 2WhatisPizzeriaBrandi'spurposeofdisplayingtheletter A．ToshowhonorforQueenMargherita． B．Tohatchamarketingplot． C．Toprovethepizza'srelationwiththeroyalfamily． D．TotelltheworldPizzaMargheritaisexactlyasymbolofItaly． 3ThenameoftheHawaiianpizzacamefrom． A．anotherbrandoffood B．aCanadianrestaurant C．thefounder'sowninterest D．itsuniqueHawaiianflavor
数列{an}的前n项和为Sn且Sn＝3n﹣1n∈N*． 1求数列{an}的通项an 2求数列{2n﹣1an}的前n项和Tn
若抛物线x2＝2pyp＞0在点12处的切线也与圆x2+y2﹣2x+2y+2﹣a＝0相切则实数a的值为．
已知向量若则＝．
在三棱锥P﹣ABC中PA⊥平面ABC∠BAC＝120°AP＝M是线段BC上一动点线段PM长度最小值为则三棱锥P﹣ABC的外接球的表面积是
设fx是﹣∞+∞上的奇函数且fx+2＝﹣fx下面关于fx的判定其中正确命题的个数为 ①f4＝0 ②fx是以4为周期的函数 ③fx的图象关于x＝1对称 ④fx的图象关于x＝2对称．
双曲线的一个焦点为F过点F作双曲线C的渐近线的垂线垂足为A且交y轴于B若A为BF的中点则双曲线的离心率为
已知不等式x+y≥4对任意正实数xy恒成立则正实数a的最小值为．
设复数z满足iz＝1+2i则复数z的共轭复数为．
如图在四棱锥P﹣ABCD中底面ABCD为直角梯形AB∥CDAB⊥AD△PAB与△PAD均为等边三角形点E为CD的中点． 1证明平面PAE⊥平面ABCD 2若点F在线段PC上且CF＝2PF求三棱锥F﹣BEC的体积．
已知函数． 1求函数fx的单调区间 2是否存在实数a使得函数fx的极值大于0若存在求a的取值范围若不存在说明理由．
已知fxgx都是定义在R上的函数gx≠0f′xgx＞fxg′x且fx＝ax•gxa＞0且a≠1若数列的前n项和大于62则n的最小值为
在△ABC中角ABC所对的边分别为abc且． 1证明acb成等比数列 2若c＝3且sin2C＝2cos2C+1求△ABC的周长
WhenIwasfiveyearsoldmymothersufferedfromdepression﹣andotherhealthissuesleavingmetocareforher．This1reversedourrolesaschildandcaretaker． WhileIknewmymotherwassickI2thateverythingwouldbeokay．3in1997everythingwenthorribly4andmylifechangedforever． Adoptionisan5wordtoafive﹣year﹣oldbutwhenI6thatmymotherhadsignedmeovertostrangersIfeltitwastheultimatebetrayal．Isufferedfromshock7andconfusionasIattemptedto8mynewfamily．IdidlearntolovemynewparentsthoughIcouldn'tforgivemymotherfor9me．Hearingpeopletellmethatshediditinmybestinterest﹣thatsheactually10me﹣mademebitter．Iinsistedthat11shehadtrullylovedmsshewouldhavemadeitworkforourlittlefamily． HowevertheolderIgotthemoreIbegantounderstandhow12oursituationhadbeen．Wehadbeen13boxesofnoodlesandweevenlivedinourcar．Ihavestartedtounderstandthe14sheputmeupforadoptionandthatshereallydidsaveme． OnlyrecentlyhaveIbegunto15howamothercouldgiveherchildtostrangersandIrealizenowwhatasacrificeitmusthavebeenforhertoletmego．Shewas16buteveninherstatesheunderstoodthatshewaspullingmedownwithher．Shelovedme17anythingsoshewantedmetohaveachanceinlifeonesherealisedshecouldnolonger18me．WhenIlookbacknowIam19toher．EventhoughIresented怨恨herforalongtimeInowknowmylifehasbeenaspecilagiftonlybecauseshewas20enoughtogivemeup． 1A．trend B．direction C．situation D．operation 2Arecognized B．believed Cadmitted D．explained 3A．However B．Therefore C．Otherwise D．Besides 4A．well B．wrong C．mad D．common 5A．exact B．right C．warm D．foreign 6A．regretted B．wondered C．realized D．expected 7A．cold B．hunger C．tiredness D．anger 8A．giveup B．worryabout C．adjustto D．searchfor 9A．rejecting B．raising C．criticizing D．accompanying 10A．blamed B．loved Cfeared D．forgot 11A．although B．if C．since D．unless 12A．familiar B．simple C．desperate D．stable 13A．throwingaway B．chargingfor C．dreamingof D．survivingon 14A．reasons B．risks C．rules D．results 15A．remember B．understand C．ignore D．describe 16A．upset B．sick C．polite D．calm 17A．otherthan B．ratherthan C．morethan D．lessthan 18A．lend B．control C．teach D．offer 19A．grateful B．similar C．equal D．rude 20A．curious B．patient C．selfless D．careful
已知函数fx＝|x﹣3|． 1若ft+f2t＜9求t的取值范围 2若存在x∈[24]使得f2x+|x+a|≤3成立求a的取值范围．
ThereisarestaurantinmyMainetownthathasdonelittletoupdateitselfoverthepast80years．Thisispartofitscharmasisthewoodenphonebooththatsitsneglectedintheageofthecellphone．Ahthephonebooth．Weneeditnowmorethanever． Formeitsymbolizesthatphonecallswereonceprivateaffairseveniftheinformationbeingsharedwasnotsensitiveinanyway．Itwassimplyassumedthataphonecenversationwasmeantfortwopeopleandtwopeopleonly． Growingupinthe1960swehadonlyphoneinthehouse．AsakidIdidn'tgetormakemanycallsbecauseallmyfriendsfivewithinearshotandIcouldjustyelloutthewindowifIwantedtheirattention．IdohoweverrememberansweringthephoneaskingfortheidentityofthecallerandthenhandingthephonetomymomShe'dtakeitsayHelloMrs…onemomentpleaseandthenassheplacedherhandoverthereceiversheturnedtomeanddirectedThisisforme．Whydon'tyougooutsideandplay Flashforwardtowhatcellphoneshavedonetoourlife．Withinthespaceofafewyearsoverhearingprivateconversationsseemstobenormal．NotlongagoIwassittinginBoston'sSouthStationnearamanwhowasonhiscellphonewaitingformytrain． ThefollowingiswhatthemanhadtosayYesthat'sright．Theredandyellowroses．Thenhecontinuedtorecitehiscardnumberaridexpirationdate有效期．Istaredatthefellow．HeglancedatmeandaskedWhatMyresponsewasimmediateIrecitedhiscardnumberbacktohimalongwiththeexpirationdate． Thereisnolongerasenseofpersonalbordersorlimits．Thecellphonehasbecomeamegaphone扩音器andIhavebeenprivy私下知情todetailsofpeople'slivesthatIwouldrathernotknow．Maybephoneboothscouldserveascellphoneharborstoday． 1WhatfeaturedoestherestaurantinMainetownhave A．Itisverypopular B．Itisold﹣fashioned C．Itwillclosedown D．Ithasbeenneglected 2Asakidtheauthor A．hadafewfriends B．oftencalledhisfriends C．wasnotallowedtoanswerthephone D．learnedthatphoneconversationsareprivate 3Whatistheauthor'sattitudetowardscellphone A．Critical B．Tolerate C．Optimistic D．Approving 4WhatdidtheauthordoinBoston'sSouthStation A．Hetalkedtoanoldfriend． B．Heboughtsomecolorfulroses． C．Heoverheardaman'spersonalinformation． D．Hehelpedastrangerwhowasmakingacall．
设ab均为实数则“a＞|b|”是“a3＞b3”的
设集合A＝{x∈N*|x≤6}B＝{24}则∁AB＝
已知函数fx＝xlnx﹣axa∈R． 1求函数fx的单调区间 2若fx+a≥0恒成立求a的值．
Indonesiaishometofouroftheworld'sworstpollutedriversandrankssecondwhenitcomestoplasticwaste．Sincesingle﹣usepackagingisalargecontributortotheproblemEvowareanIndonesian﹣basedcompanydecidedtohandlethatissuefirst．Andnowakindofedible可食用的packetshasbeeninvented． Afterinvestigatingvariousmaterialoptionsthecompanysettledonseaweed．Unlikecomcommonlyusedforcontainersseaweeddoesnotrequireresourceslikewaterorlargeamountsofspace．AccordingtoEvowareasmuchas40tonsofseaweedcanbegrowninanareathesizeofabaseballfield．Italsohelpsabsorbharmfulgreenhousegaseslikecarbondioxide．SinceIndonesianfarmersalreadyharvestmoreseaweedthantheycansellitiseasyforthecompanytofindthematerial． ThoughtheywillnotmakepublictheirproductionprocessEvowareannouncestheseaweedpackagingcontainsnochemicalsandissafetoconsume．Inadditiontowrappingfastfooditemsitcanalsobeusedtohousethingslikeinstantnoodleseasoning调味品andinstantcoffee． Thoughtheediblewrappersmaynothaveanytastethesamecannotbesaidaboutthesingle﹣usecupsthatthecompanyhasalsoinvented．Thesingle﹣usecupsthatcanbeusedtoservecolddrinksareavailablewiththetasteoforangeandgreentea． Whilereplacingplasticwiththeseaweedproductsmayseemlikeano﹣brainertomostofusitisahard﹣sellinIndonesia．AccordingtoChristianTheawarenessunderstandingandsenseofurgencytominimizetheuseofsingle﹣useplasticarestillverylow．Alsoafactoristhecostwhichishigherthanusingplastic． HopefullyEvowarewillsucceedinconvincingIndonesiansandpeopleworldwidethatswitchingtotheirproductswillgoalongwayinprotectingourbeautifulplanet． 1WhatisEvoware'spurposeofinventingeatablepackages A．Tomakefulluseofseaweed． B．Tomakegenerousprofits． C．Toattractmorecustomers． D．Toreduceplasticpollution． 2Whatcanwelearnaboutseaweedfromparagraph2 A．Itiseasytoget． B．Itbreaksdowneasily． C．Itishardtoharvest． D．Itcangrowinabaseballfield． 3Howaresingle﹣usecupsdifferentfromseaweedpackaging A．Theyarebeautiful． B．Theyhavedifferenttastes． C．Theyareinvariousshapes． D．Theyareenvironmentallyfriendly． 4Whatstopstheseaweedproductsbeingwidelyused A．Thehighcost． B．Theterribletaste． C．Thelackofseaweed． D．Thecomplexproductionprocess．
TheearthhaschangedoverandoveragainthroughoutthecourseofitshistoryInordertosurviveinchangingenvironmentsspeciesmustoftengothroughaprocessofadaptation．Adaptationreferstogeneticchangethatenablesanorganism生物体suchasananimalorplanttosurviveinitsenvironment．Iftheorganismsofaspeciescannotchangealongwiththeareainwhichtheylivetheyriskdyingout．Recenthistoryhasgivenusanimportantexampleofhoworganismsareabletosurviveoncetheirenvironmentschange． Lightgraypepperedmoths胡椒蛾anddark﹣coloredpepperedmothslivedinthecountrysidebetweenthecitiesofManchesterandLondoninEnglandManyyearsbeforethe19thcenturymoreofthelightgraypepperedmothshadbeenabletosurviveintheirenvironmentmostlybecauseoftheircolor．Birdscouldn'tseethelight﹣coloredmothsonthetreesbecausethecolorofthemothswassimilartothecolorofthetrees． Intheearly19thcenturythoughEnglandbeganthefirstyearsofitsIndustrialRevolution．Manyareasbecameoccupiedbyagrowingnumberoffactories．Manyofthesefactoriesneededcoaltoprovideenergyfortheirmachines．Whencoalbumsitgivesoffalotofdark﹣coloredsmokes．Thetreesbegantoblackenbecauseofallthesmokeintheairfromthefactories．Thismadethelightgraypepperedmothsmuchmorevulnerable．Birdscouldseethemonthetreesmoredearlyandeasilyhuntthemdown． SometimeinthenexthundredyearsscientistsbegantonoticeahugechangeinthemothpopulationlivinginandbetweenthecitiesofManchesterandLondon．Mostofthepepperedmothswereofthedark﹣coloredkind!Whatcausedthischangewasthefactthatbirdshadeatenalotofthelightgraypepperedmothsbecausethemothscouldbeseenclearlyonthedarkenedtrees．Thedark﹣coloredpepperedmothsintheareasurvivedmuchmoreeasilyandmatedwithotherdark﹣coloredpepperedmothsuntilmostofthepopulationofpepperedmothsbecamedark﹣colored． 32．Ifaspeciescan'tadapttothechangingenvironmenttheyarelikelyto． A．bedrivenoutoftheirhabitat． B．becomeextinct C．movetoanotherenvironment D．gothroughgeneticchanges 33．Whatconclusioncanbedrawnfromthechangeintwokindsofmoths A．Therewerepreviouslynodark﹣coloredpepperedmoths． B．Thelight﹣coloredpepperedmothsmovedtoanewenvironment． C．Thecolorchangehadnothingtodowiththechangeintheirenvironment． D．Darkcoloringwasbetterforthepepperedmothssurvivalinthe19thcentury． 34．Whatdoestheunderlinedwordvulnerableprobablymean A．Quicktochange B．Opentoattack C．Easilydefended D．Inastrongposition 35．Whatdoestheauthormainlydescribeinthepassage A．HowtheIndustrialRevolutionimprovedthelivesofworkers． B．Howtheearthchangedthroughoutthecourseofitshistory． C．Howhumaninfluenceorganismsthroughartificialselection． D．Hownaturalselectionchangedthepopulationofpepperedmoths．
热门题库
更多
高二下学期生物
高三下学期生物
高三下学期化学
高三上学期英语
高二下学期英语
教案备课库
高三下学期英语
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
国际法
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号