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下列四个几何体中，是三棱柱的为（ ）
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下面四个几何体中主视图左视图俯视图是全等图形的几何图形是
圆柱
圆锥
三棱柱
正方体
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的________填入所有可能的几何体前
一个几何体的表面展开图如图所示则这个几何体是
四棱锥
四棱柱
三棱锥
三棱柱
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的______填入所有可能的几何体前的编
下列四个几何体中主视图左视图与俯视图是全等图形的几何体是
球
圆柱
三棱柱
圆锥
下列四个几何体中是三棱柱的为
如图⑴⑵⑶⑷为四个几何体的三视图根据三视图可以判断这四个几何体依次分别为
三棱台、三棱柱、圆锥、圆台
三棱台、三棱锥、圆锥、圆台
三棱柱、正四棱锥、圆锥、圆台
三棱柱、三棱台、圆锥、圆台
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的__________填入所有可能的几
如图⑴⑵⑶⑷为四个几何体的三视图根据三视图可以判断这四个几何体依次分别为
三棱台、三棱柱、圆锥、圆台
三棱台、三棱锥、圆锥、圆台
三棱柱、正四棱锥、圆锥、圆台
三棱柱、三棱台、圆锥、圆台
下列各组几何体中是多面体的一组是
三棱柱 四棱台 球 圆锥
三棱柱 四棱台 正方体 圆台
三棱柱 四棱台 正方体 六棱锥
圆锥 圆台 球 半球
下列四个几何体中主视图左视图与俯视图是全等形的几何体是
球
圆柱
三棱柱
圆锥
一个几何体的正视图为一个三角形则这个几何体可能是下列几何体中的____________填入所有可能
如图网格纸的各小格都是正方形粗线画出的是一个几何体的三视图则这个几何体是
三棱锥
三棱柱
四棱锥
四棱柱
下列四个几何体中主视图左视图与俯视图是全等图形的几何体是
球
圆柱
三棱柱
圆锥
下列四个几何体中主视图左视图俯视图完全相同的是
圆锥
球
圆柱
三棱柱
如图1234为四个几何体的三视图根据三视图可以判断这四个几何体依次分别为.
三棱台、三棱柱、圆锥、圆台
三棱台、三棱锥、圆锥、圆台
三棱柱、四棱锥、圆锥、圆台
三棱柱、三棱台、圆锥、圆台
一个几何体的展开图如图所示这个几何本是
三棱柱
三棱锥
四棱柱
四棱锥
一个几何体的表面展开图如图所示则这个几何体是
四棱锥
四棱柱
三棱锥
三棱柱
如图四个几何体分别为长方体圆柱体球体和三棱柱这四个几何体中有三个的某一种视图都是同一种几何图形则另一
长方体
圆柱体
球体
三棱柱
如图四个几何体分别为球体圆柱体长方体和三棱柱这四个几何体中有三个的某一种视图都是同一种几何图形则另一
球体
圆柱体
长方体
三棱体
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2018年联合国把世界水日的主题定为“废水”关注重点是寻找各种方式来减少和再利用废水．下列有关水资源的说法错误的是
Generallyspeakingpeoplelikethosewhohaveagoodsenseofhumor.Sometimesatouchofhumormightwellenableustowin.Considerthecaseofayoungfriendofminewhohitatrafficjamonhiswaytoworkshortlyafterreceivinganultimatum最后通牒aboutbeinglateonthejob.AlthoughtherewasagoodreasonforBrian'sbeinglate﹣seriousillnessathome﹣hedecidedthatthisby﹣now﹣familiarexcusewouldn'tworkanylonger.Hisbosswasprobablyalreadypacingupanddownpreparingadismissalspeech.YesthebosswasasBrianenteredtheofficeat935.Theplacewasasquietasalockerroom更衣室everyonewashardatwork.Brian'sbosscameuptohim.SuddenlyBrianforcedasmileandstretchedouthishand.'Howdoyoudo!'hesaid.'I'mBrian.I'mapplyingforajobwhichIunderstandbecameavailablejust35minutesago.Doesn'ttheearlybirdgettheworm?'Theroomexplodedinlaughter.Thebossclampedoffasmileandwalkedbacktohisoffice.Brianhadsavedhisjobwiththeonlytoolthatcouldwin﹣alaugh.Humorisamosteffectiveyetfrequentlyneglectedmeansofhandlingthedifficultsituationsinourlives.Itcanbeusedforpatchingupdifferencesapologizingsaying'no'criticizinggettingtheotherfellowtodowhatyouwantwithouthislosingface.Forsomejobsit'stheonlytoolthatcansucceed.Itisawaytodiscusssubjectssosensitivethatseriousdialogmaystartaquarrel.Forexamplemanybelievethatcomediansontelevisionaredoingmoretodayforracialandreligioustolerance忍受力thanpeopleinanyotherforum.1Brianwaslateforhisjobbecause.A.hegotuplateB.hewasseriouslyillC.hewascaughtinatrafficjamD.hewasbusyapplyingforanewjob2Whatcanweinferabouthumor?A.Itistheearlybird.B.Itisimportantinourlives.C.Brianoftensavedhisjobwithhumor.D.Itcansolveracialdiscriminations.3Whatdoestheunderlinedphrase'clampedoff'inParagraph3referto?A.chargeB.triedtosetC.gaveupD.triedtoholdback4Whatcanwelearnfromthetext?A.Manypeoplelackinasenseofhumor.B.Brianwassupposedtoarriveathisofficeat830.C.Itwasn'tthefirsttimethatBriancamelateforwork.D.Humoristhemostinterestingwayofsolvingproblems.
Takingcareofyourselfisnotbeingselfish.Bycaringenoughto1yourbodywellyouwillbein2shapetotakecareofthosearoundyou.Noonecantakecareofyourhealth3yourself.Believeinyourselfandyour4.Havea'can﹣do'attitude.Makealistof5changesthatyouhavemadeinthepast.Itiseasierto6agoalwhenyouare7.Usehumorandlaughoffoccasionallapses过失.Haveconfidencethatyoucangetbackontrackwithyourhealthy8.Seekoutafriendorco﹣workerwhowillmakeyoufeelcomfortable.Youwillfindout9friendsisahappythingintheworld.Regularphonecallsemailsorvisitovercoffeecouldhelpyoukeepagoodcontactwiththem.10yourcheerleadercouldbecomeyourexercisebuddy密友.11yourselfasyoumakesimplechangesthatintheendwill12inachievingyouroverallgoal.Celebrationispartofsuccessfulchange.Createalistofincentives动机thatwill13youmotivated.Adopteatingandphysicalactivityhabitsthatcanbecomepartofyour14.Haveabackupplan15thosedayswhenyourplanstoeatwellandbeactivearechallenged.Ifyoucan'twalk16theweatherhaveanexercisevideotouse.Ifyouhavenotimetopacka17lunchchooseasmallfastfoodsandwichandsidesalad.Goona18.Workandfamilyaretwomostimportantthingsinpeople'slives.Peopletrytotacklethetwothingsatonce19mostofthemfail.JustasanoldsayinggoesPeoplewhoknowhowtorest20howtowork.Gooutwithyourfamilyandhaveagoodtime.1A.see B.take C.use D.treat2A.better B.worse C.bigger D.smaller3A.besides B.except C.beside D.beyond4A.body B.attitude C.ability D.eyes5A.successful B.little C.strange D.few6A.check B.discover C.achieve D.declare7A.optional B.particular C.dynamic D.optimistic8A.work B.routine C.face D.sight9A.taking B.making C.sharing D.playing10A.Surely B.Quickly C.Perhaps D.Slowly11A.Reward B.Pick C.Pass D.Instruct12A.introduce B.gain C.find D.result13A.found B.pass C.build D.keep14A.family B.friendship C.object D.lifestyle15A.to B.on C.for D.outside16A.outof B.dueto C.awayfrom D.onto17A.healthy B.rich C.interesting D.passive18A.trip B.talk C.story D.meeting19A.and B.but C.because D.though20A.study B.accept C.know D.discuss
下列物质中只含有离子键的是
Thecouplewasinitiallylookingforwardtohavinganoverseasweddingbuthadtodroptheideaafterfacingfromparents. A.recognition B.toleration C.opposition D.proportion
﹣Whatwouldyouliketodothisweekend? ﹣.It'suptoyou. A.Whatever. B.Definitely. C.Goahead. D.Goodidea.
研究有机化合物的组成结构分类有利于全面认识其性质． ①下列有机化合物属于芳香烃的是填字母． ②下列有机化合物不能与NaOH溶液反应的是填字母． a．乙醇b．苯酚c．甘氨酸 ③下列有机化合物既能发生酯化反应又能发生银镜反应的是填字母． a．HCOOCH2CH3b．CH3CH2Brc．
均衡营养是保证人体健康的重要保证 俗话说“冬吃萝卜夏吃姜不用先生开药方”萝卜富含蛋白质糖类酶维生素C维生素B木质素钙铁锌钠． ①萝卜中可为人体提供能量的是和属于微量元素的和． ②萝卜含丰富的维生素C有助于增强机体的免疫功能．维生素C又称． ③萝卜中的酶能分解食物中的淀粉脂肪有助于食物消化吸收．淀粉在人体内水解的化学方程式 ．
下列反应属于加成反应的是
衣康酸是一种重要的有机化学中间体可通过下列方法合成 ①B→C的反应类型． ②有机物A可能的结构简式为． ③D发生加聚反应所得有机物的结构简式为． ④写出同时满足下列条件的C的一种同分异构体E的结构简式． Ⅰ．能与盐酸反应 Ⅱ．E为五元环状化合物分子中有4种不同化学环境的氢．
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. Whenholidaysdrawnearlypeopleusuallygreetedeachotherinavarietyofways.Somepeopleoftengoonthelineandsende﹣mailsorelectroniccardstotheirfriendsrelativesandteachersthatothersprefertomakephonecallsorsendshortmessagesbymobilephone.Inawordpeoplechoosedifferentlytoexchangetheirbestwishduringourholidays. AstomeI'dlikesende﹣mailsorelectroniccards.Firstitcostslittleandnomoney.What'smorealotofpaperissavingwhichisenvironmentallyfriendly.
DotherightThingInlifepeoplefeelmostsatisfiedwhentheychooseoptionsthatsidewiththeirmostdeeplyvalues.Here'showtostaytruetoyours.Ifyouhopetohaveyourlifeshapedaccordingtoyouridealsyouhavetoknowwhatthoseidealsare.Perhapsbeginsessionsbyidentifyingtheconceptsthataremostimportantfromalisthonestystructurefamilyandsoon.Thosequalitiesareinfluencedbyyourparents.yourcultureandsocietyasawholebutyouhavetotakeownershipofyourowndecisions.Almostallofthesequalitiesarethingsmostofusdesiretoholddear.Todeterminewhichprinciplesaremorethanjustdesiresreflectonsituationsthatresonatetngwithyourself.Identifyingyourvalueswillguideyouintherightdirectionbutafewstrategiescanhelpyoufollowthrough.Beforeyoumakeabigdecisiondosomethingthatwillputyouinhighspiritsexercisesocializewithfriendsvolunteer.Researcherstheorizethatsuchactivitiesimproveourmoodwhichpromotesdopaminelevelsincertainareasofthebrainimprovingourcognitiveabilitiesandhelpingusweighdifferentoptions.Troubleisthetoughestdecisionsoftenarriveatthemostinconvenienttimes.whenyou'reunderforce.askafamilymember.afriendor.incertaincasesaprofessionalforadvice.Theycanprovideadvicethat'snotslightlyinfluencedbytheworkdeadlineorleakyroofgraduallyweakeningyourmentalenergy.Ofcourse.peoplemakedecisionsthatcontradicttheiridealsallthetime.TherearelotsofvaluesweholddearandtheyfrequentlycomeintoconflictwithoneanotherIt'snotsomuchthatpeopledon'tknowwhattheywantit'sthattherearemanythingswedesireandwedon'talwaysknowhow.Whileasingledecisioncanseemlikeatug﹣of﹣warbetweencompetingdesiresbroaderlifechoicesdon'tneedtobeadefinitiveeither/orquestion.Onewholikestravelingworldwidemighttemporarilyputoffagrandtriptoexplorelocationsclosertohomeorcommittosettingasidetimeforvacationwiththeirfamilyeverysummernomatterwhatelsecomesup.Surroundyourselfwithpeoplewhobesidessharingyourpassioncanalsopreventyoufromhesitating.AgroupcanremindyouHeyweredoingthisbecauseweloveit.'Ifyou'restillstruggling.evenafterseekingoutcommunitysupportthere'snoshameinrevisingyourcorevalues.Ifyou'redeterminedtotakepartinacharityprogrambutspendtheeveningwithfriendsinsteaditmaybetimetoacceptthatfriendshipismoreimportanttoyouthanvolunteerism.Betteryetfindopportunitiestocontinuethecharityprogramwithyourfriends.Youmaylearnthatwhatyoubelievedwasacorepriorityactuallyhasmuchmoretodowithlivinguptowhatyourparentsco﹣workersorothersexpect.Ifyourvaluesagreewithwhoyoureallyarenoiewillhavetoaskyoutomakethosechoices.
现有硫酸铁硫酸亚铁和硫酸混合溶液200mL现将其分成两等份往其中一份中滴加足量BaCl2溶液产生25.63g白色沉淀往另一份中投入足量铁片放出1.12L气体标准状况下．下列判断不正确的是
亚氯酸钠NaClO2是一种重要漂白剂某探究小组开展如下实验回答下列问题 实验Ⅰ制取NaClO2晶体按如图装置进行制取． 已知NaClO2饱和溶液在低于38℃时析出NaClO2•3H2O高于38℃时析出NaClO2高于60℃时NaClO2分解成NaClO3和NaCl． 1已知装置B中的产物有ClO2气体装置B中反应后的溶液中阴离子除了ClO2﹣ClO3﹣Cl﹣ClO﹣OH﹣外还可能含有的一种阴离子是检验该离子的方法是． 2请补充从装置D反应后的溶液中获得NaClO2晶体的操作步骤． ①减压55℃蒸发结晶②③用38℃～60℃热水洗涤④低于60℃干燥得到成品并转移产品．操作的四个步骤中都用到的玻璃仪器是． 3D中用冷水浴其目的是回答一点即可． 实验Ⅱ样品杂质分析与纯度测定 4测定样品中NaClO2的纯度．测定时进行如下实验 ①准确称0.4000g样品加入适量蒸馏水和过量的KI晶体和硫酸发生如下反应ClO2﹣+4I﹣+4H+═2H2O+2I2+Cl﹣ ②将所得混合液稀释成100mL待测溶液．取25.00mL待测溶液加入淀粉溶液做指示剂用0.200mol•L﹣1Na2S2O3标准液滴定至终点测得消耗标准溶液体积的平均值为15.00mL已知I2+2S2O32﹣═2I﹣+S4O62﹣． 判定滴定到终点的标准是 请计算所称取的样品中NaClO2的质量分数并写出计算过程．
AprimaryschoolprincipalinnorthChinahasbecomethelatestinternetcelebrityforbustingsomecoolmovesduringamorningexerciseroutinewithhisstudents.Everymoming40﹣year﹣oldprincipalZhangPengfeiattheXiGuanPrimarySchoolinLinyicountyShanxiprovincewouldleadabout700pupilsontheplaygroundinasynchronised'ghostshuffle'routine﹣adancethatincorporatescontemporaryjazzstepswithheeltoeandarmmovements.Theboldheadmasterthoughtthefunandenergeticexerciseroutinewouldbetterencouragestudentstogetactiveinsteadof'beinggluedtotheirmobilephones'.Theschool'snew30﹣minutedanceroutinehasreplacedthegovernment﹣imposedbroadcastcallisthenicsprogrammeashortworkoutthathasbeenarequirementateveryprimarymiddleandsecondaryschoolinChinasince1951.'Ithoughtweneededachangebecausethestudentshavebeenlosinginterestindoingthebroadcastcallisthenicsroutine'ZhangtoldSouthernMetropolisNews.Thededicatedprincipalsaidhecameacrossagroupofpeopledoingthe'ghostshuffle'routineatapublicplazalastsummeranddecidedtoleamthedancehimself.'Ithoughtthedancewouldbegreatforkids'hesaid.'Themusicisfullofenergyanditreallygetsthehappyfeelingofflowing.'InOctober.heintroducedthechoreographed编舞routinetoallofhisstudentsandshortlyaftereventeachersandstaffwerejoiningin.'Nowthestudentsaren'tconstantlyontheirphones.Isometimescatchthemwatchingdifferentdanceroutinevideosandlearningnewmoves!'theproudheadmastertoldreporters.ThevideoquicklywentaroundonChinesesocialmediawithaWeibotopicpagetitled'principalleadsstudentsinghostdanceroutine'gathering250millionviews.'Thisisperhapsthebestadaptionofsportandentertainmentforchildren.'acommentonWeiboread.1Whatcanweknowfromthepassage?A.ZhangPengfeiisaprimaryschoolprincipalinsouthChina.B.XiGuanPrimaryschool'snew30﹣minutedanceroutineisbothfunandenergetic.C.DoingthebroadcastcallisthenicsroutineisonlyrequiredatprimaryschoolsinChina.D.FewpeopleshowedinterestinZhangPengfei'sghostdanceroutinevideoonWeibo.2Whatcanweinferfromthelastparagraph?A.Pepoleholdacriticalattitudetowardstheadaptation.B.Pepoleholdanindifferentattitudetowardstheadaptation.C.Pepoleholdanegativeattitudetowardstheadaptation.D.Pepoleholdasupportiveattitudetowardstheadaptation.3Whichofthefollowingcanbethehesttitleforthepassage?A.AfamousprimaryschoolprincipalZhangPengfeiB.TraditionalcalisthenicsprogrammesinChinaC.AChineseprincipalleadsstudEntsinghostdanceroutineD.AninternetcelebrityinChina4Fromwhichpartofamagazinecanwereadthispassage?A.AgricultureB.TechnologyC.EconomyD.Education
﹣ShouldIaskthebossifhe'supsetatmycominginlateinthemornings? ﹣Ifhehasn'ttsaidanythingaboutitjust. A.letsleepingdogslie B.strikewhiletheironishot C.putyourselfinhershoes D.killtwobirdswithonestone
下列化学用语表示正确的是
Fromaninnocentchildren'scartooncharactertoatopculturaliconPeppaPigaBritishpreschoolanimatedTVserieshasundergoneanamazingjourneyinadaptingtoChinesecultureandChina'smarket.2015InJunethePeppaPigTVserieswasintroducedtotheChinesemarketbyEntertainmentOneandfirstairedontheCCTVChildren'sChannel.ShortlyafteritspublicationPeppaPigattractedbillionsofviewsonsocialmediaplatformslikeiQiyiYoukuandTudou.2016ThePeppaPigTVserieswasbroadcastontheCCTVChildren'sChannelforasecondround.ItalsogainedmoreviewersontheGoldenEagleAnimationChannelHunanTV.2017Thephrase'PeppaPigGirl'becameoneofthehottestbuzzwordsonChina'sInternet.Itreferstoagirlwhoholdsapositiveattitudetowardlifeeventhoughshetendstobelazyinherdailylife.Shemightlookabitsillyandoftenhavetastyfoodasatoppriorityonhermind.2018RumorsclaimedthatPeppaPigwasbannedfromDouyinChina'smajorvideosharingplatformsayingit'violates违反thecommunityregulationsandhasnotpassedcensorship审查制度'.InMayhoweverrepresentativesfromDouyinsaidtheappwasnotforbiddingPeppaPig.2019AccordingtoEntertainmentOnemorethan40millionPeppaPigbookshavebeensoldsinceitssecondroundbroadcastonCCTV.IntheyearofthePigmorecompaniesareaddingPeppa﹣themedelementstotheirproductsforpromotion.1Sincemorethan40millionPeppaPigbookshavebeensold.A.2015B.2016C.2017D.20182Whatdoesthepassagemainlytalkabout?A.PeppaPigsjourneytobecomeaChineseculturalimage.B.PeppaPigshigheconomicvalueinChina.C.ThecausesofthegreatpopularityofPeppaPigTVseries.D.TheIntroductionofPeppaPigtothewholeworld.3WhatcanweleanaboutPeppaPigaccordingtothepassage?A.TheTVserieswasfirstbroadcastonHunanTV.B.FoodisthefavoriteofaPeppaPigGirlwhoissilly.C.YearofthePigwillhelppromotethesalesofthePeppa﹣themedproducts.D.PeppaPigwasbannedinDouyinbecauseitbrokethelaw.
AlarmingheadlinessuggestoneinfourteenagegirlsintheUKareself﹣harmingmotivatedbysexdiscriminationandpressurestolookgoodinaselfie自拍society.ThesestoriescomefromareportbyUKcharityTheChildren'sSocietybasedonanongoingsurveyof11000childrenaged14.Amongthegirls22percentsaidtheyhadself﹣harmedwhileboys9percent.Butwhilethetermself﹣harmimprovesimagesofteenagerscuttingthemselvesthatmaythankfullybeonlythemostextremeendofabroaderrange.Inthissurveyparticipantsweremerelyaskediftheyhad'hurtthemselvesonpurposeinanyway.Somecouldhaveansweredyesforthingslikepunching击拳awallindissatisfactionordeliberatelygettingfalling﹣downdrunk.Otherscouldhavethoughtthequestionincludedmentalhurt.Suchself﹣destructivebehaviourwouldnaturallybeofconcerntoparents.butwouldn'tbethatunusualforteenagers.MaxDavieahealthpromotionofficerdoesbelievethatself﹣harmamongteensissomewhatontherise﹣﹣butthinksthequestioninthissurveywasnotspecifenoughtorevealitsrealuniversality.Thelatestheadlinesjoinanongoingaccountaboutamentalhealthcrisisintoday'syouth.SomeblamecutbacksinsocialserviceswhileotherspointtoalooseningofsexualstandardsteensatriskForthosecautiousofnewtechnologiesitissocialmediaorthelatestpopularcomputergames.Butsuchreportsalsodeservesomeskepticism.Claimsofhighratesofdepressionareusuallybasedonsurveyswithveryloosenon﹣medicalcriteria.Thankfullyclinicaldepressionisstillrareinthisagegroup.Infactadifferentandregularlyrepeatedsurveyhasfoundnochangein11﹣to﹣15﹣year﹣old'shappinesswithlifeasawholebetween1995and2016Nordidtheirsatisfactionwiththeappearancechangewhichmakesitstrangetoblametheselfieculturefortheapparentself﹣harmincrease.ThissurveycalledUnderstandingSocietyevenfoundimprovementinhappinesswithfamilyandschoolworkoverthatperiod.ThesemoreoptimisticfindingswerealsointhelatestChildren'sSocietyreportbutwereburiedatthebottomoftheirpressrelease.Daviethinkstheriseinself﹣harmmaynotbeduetoariseinunhappinessbutsimplythatthisagegroupnowseesself﹣harmasamoreculturallyacceptablewaytoexpressextremesufferings.'itmaybethatpreviouslypeopledidn'tknowthatthiswassomethingyoucoulddo.Ifpeoplearetalkingaboutsomethingandnormalizingitit'sprobablymorelikelythattheirpeerswilldoit.'Ifthatisthecaseitisallthemorereasonnottomakeself﹣harmseemmorecommonthanitreallyis.1InresponsetothesurveyreportedbyTheChildren'sSocietytheauthorbelieves.A.thesurveyisunscientificasitaskedveryspecificquestionsB.theself﹣destructivebehaviorforteensisworryingtoparentsC.thenumberofself﹣harmingteensisalarmingbecauseofselfiesD.theimagesofteens'self﹣harmarebecomingmorespecific2WhatdoesMaxDaviethinkofself﹣harmamongteenagers?A.Thesituationistooworrying.B.Theriseissomewhatbeneficial.C.Theproblemisactuallywidespread.D.Thephenomenonisnotsouniversal.3WhatcanweknowfromthesurveycalledUnderstandingSociety?A.Teenagersinthepastlivedahappierlife.B.Selfiecultureisresponsiblefortheincreaseofself﹣harm.C.Thereisnoconnectionbetweenself﹣harmandselfie.D.Withselfieteenagersaremoresatisfiedwiththeirappearance.4Thelasttwoparagraphsmainlyimplythat.A.self﹣harmresultsfromtoomuchpressureB.self﹣harmistheresultofsocialdevelopmentC.teensneedcorrectguidancefromtheoutsideD.teensshouldavoidfollowingpeersexamples
Manyyouthswanttoleanhowtodrivecars.ThisyearonesixthofundergraduatesinBeijinghaveregisteredatdrivingschool.Thestudentsmostlyfrommajorssuchasbusinessmanagementorimitationaltradewillfinishtheirdrivingcourseswithin20daysorso.Trainingcostshavedroppedto4500yuanforstudentsaccordingtotheHaidianDrivingSchoolinBeijing.Thepriceisnotreallylowbutstudentswillacceptitseeingitasaninvestment投资intheirfuture.FamiliaritywiththeoperationofcomputersandfluentEnglisharethebasicskillsgraduatingstudentsneedtofindajob.Butadriverspermithasbecomeanotherfactor因素.'Inthejobmarketowningadriver'spermitsometimesstrengthensagraduatingstudent'scompetitivenessforagoodposition'saysLiHuaanundergraduateattheChinaUniversityofPoliticalScienceandlaw.Carswillbecomeanecessarypartofmanypeople'slivesinthecomingyearsanditisdifficulttogetapermitoutofcampusbecauseofthepressuresonworkingpeople'stime.'Havingafull﹣timejobaftergraduationofferslimitedtimetolearntodrive.Weseniorstudentshaveplentyofsparetimeplentyofoppurtunitytolearn'saysanotherundergraduateattheuniversity.WuDonganofficialatthedrivingschoolsaidundergraduateswereveryableandseriousandcouldgraspinanhourwhatordinarypeopletookfourhourstolearn.Inthisdrivingschoolmiddle﹣agedpeopleyoungwomenandcollegestudentsarethemaincustomers.FromMarch12018togetadriver'spermitabeginnerisnowrequiredtohaveatleast86hours'practicebeforethefinalroadtest.1Whydotheundergraduateslearntodrive?A.Theyarethestudentsfromspecialsubjectorcourse.B.Theyliketodrivecarsverymuch.C.Theywantybecomefulltimedriversaftergraduation.D.Theyneedthisskilltofindagoodjobinthefuture.2WhatisWuDong'sopinionofstudentslearningtodrive?A.Itwouldmakethelifemoreinteresting.B.Youthswouldhaveanadvantageinlearningtodrive.C.Itisawasteofmoneyandtimetolearntodrive.D.Itwouldbebettertolearnitatcollegethanatwork.3Togetthepermitthestudent.A.requiressometimetopracticebeforethefinalroadtestB.mustpaymoremoneybeforethefinalroadtestC.mustpracticemoretolearntodrivewhenhavingajobD.requirestolearnsomemoreothersubjectstodrive
有人认为“脚臭盐”异味是由隐藏在岩盐矿床中极少量的丙酸丁酸等短链脂肪酸造成．丙酸分子式为C3H6O2丙酸属于
图为锌一铜原电池示意图下列说法错误的是
ImproveYourCraftWithTheseHelpfulGuidesDIYMFAITEM#T7995ByGabrielaPereiraRETAIL﹩19.99ONLINEPRICE﹩8.99.DIYMFAisthedo﹣it﹣yourselfaltemativetoaMasterofFineArtsincreativewriting.BycombiningthethreemaincomponentsofatraditionalMFA﹣writingreadingandcommunity﹣itteachesyouhowtocraftwonderfulstoriesengageyourreadersandpublishyourwork.TroubleshootingyournovelByStevenJamesITEMT9747RETAIL﹩19.99ONLINEPRICE﹩10.99Inthishands﹣oneasy﹣to﹣useguideaward﹣winningauthorStevenJamesprovideshelpfultechniquesandcheckliststimesavingtricksofthetradeandhundredsofquestionsforanalysisandrevisionoftheoriginalwork.MakeasceneByJordanRosenfeldITEN#R4981RETAIL﹩I7.99ONLINEPRICE﹩9.99*AakeaScenetakesyoustep﹣by﹣stepthroughtheelementsofstrongsceneconstructionanddemonstrateshowtheessentialaspectsofawonderfulstory﹣includingcharacterlotanddramatictension﹣functionwithintheframeworkofindividualscenes.DamnFineStoryITEM#R1990ByChuckWendiRETAIL﹩18.99ONLINEPRICE﹩12.99Greatstorytellingismakingreaderscareaboutyourcharactersthechoicestheymakeandwhathappenstothem.Andtotelladamnfinestoryyouneedtounderstandwhyandhowthatcaringhappens.UsingamixofpersonalstoriespopfictionexamplesandtraditionalstorytellingtermsNewYorkTimesbestsellingauthorChuckWendigrillhelpyouinternalizethefeelofpow.※Salespriceslistedonthelinecanbediscountedasmuchas80%withlargequantities.VisittheWDShopatwritersdigest.comformoreinformation.1Whodoesthebestincombiningtheauthorsownlifeexperiencesinwriting?A.GabrielaPereiraB.StevenJamesC.JordanrosenfeldD.ChuckWendig2Howmuchmaybesavedifastudentbuysonebookonlinetoimprovehiscompletedwork?A.﹩11.B.﹩9.C.﹩7.2D.﹩4.8
下列反应的离子方程式书写正确的是
Ts是一种人工合成的超重化学元素元素符号为Ts元素名称为下列说法正确的是
下列实验装置或操作正确的是
BeingsoathleticandcourageousHuaMulanwasn'tofmostyoungwomenofher. A.guilty B.cautious C.typical D.skeptical
Flextimeisaflexiblehoursscheduleinwhichemployeeschoosetheirownworkinghoursusuallyworkingwithinapproximatelimitssetbytheemployerorbythegovernment.1oremployeesflextimehasaclearadvantage.2Forexamplepeoplecanuseflextimetocreatescheduleswhichwillallowthemtogotoschoolhandlechildcareassistrelativesandperformothertasks.Employeesmayalsousetheirflextimetocreateaschedulewhichoptimizescreativityasinthecaseofsomeonewhowouldprefertoworkearlierinthedaytogetmoreaccomplished.3Firstittendstoincreaseemployees'satisfaction.Thismakesthecompanyabetterandmoreproductiveplacetowork.Inadditionflextimecanallowcompaniestoserveclientsforagreatportionofthedayasemployeeswillbearoundatvaryinghourstoanswerphonesattendmeetingsandsoforth.Mostflextimeschedulesincludecoretime.4EmployeesarealsousuallygivenanhourlydailyorweeklylimittoensurethattheydonotviolatelawsaboutworkinghoursOrthecompanyisonlywillingtopaywagesforsomanyhoursofworkeachweek.Aclassicexampleofaflexibletimescheduleisthatsomeonewhoworksfour10﹣hourshiftsaweekcantakethreedaysoff.Flextimecanalsobecombinedwithflexplaceinwhichtheenvironmentisbetterthanthatoftheoffice.5Employersmayalsoallowpeopletoworkinuntraditionalsettingssuchascoffeehouses.A.Employersbenefitfromflextimealot.B.It'salsoseenasafamily﹣friendlypolicy.C.Howeverflextimemaynotbeapplicabletoallfields.D.Itisaperiodofthedayinwhicheveryoneisexpectedtobeatwork.E.Manyemployersallovertheworldofferthismethodtotheiremployees.F.Forexamplehomeofficesareincreasinglypopularamongmanycompanies.G.Itallowsthemtomakechangestotheirworkschedulewhichwillsuittheirlives.
铝热法是一种利用铝的还原性获得高熔点金属单质的方法反应的化学方程式为2Al+Fe2O3Al2O3+2Fe．下列说法不正确的是
下列化学式与指定物质的主要成分对应正确的是
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