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下列实验现象的描述正确的是（ ）
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观察和实验是学习化学的重要方式下列实验现象描述正确的是
下列对实验现象描述不正确的是
描述下列实验现象其中正确的是
化学是一门以实验产基础的学科化学实验时要注意观察实验现象下列实验现象描述不正确的是
观察和实验是学习化学的重要方式．下列对有关实验现象的描述中正确的是
正确描述实验现象是进行化学实验的一项基本技能．下列实验现象描述正确的是
铜绿受热分解，变成红色固体
木炭在氧气中燃烧，发出白光，放出二氧化碳
细铁丝在氧气中剧烈燃烧，火星四射，生成黑色固体
电解水时，收集到的氢气和氧气的气体质量比为1：2
下列对有关实验现象的描述正确的是
下列化学实验现象描述正确的是
下列有关实验现象的描述正确的是
红磷燃烧产生白雾
硝酸铵溶于水温度升高
碘与淀粉作用呈蓝色
铁与稀硫酸反应溶液为棕黄色
实验是化学研究的基础对下列实验的现象描述不正确的是
实验①溶液不褪色
实验②溶液褪色
装置③用于石油的分馏
实验④饱和碳酸钠溶液上方出现油状液体
下列对实验现象的描述正确的是
实验是化学研究的基础下列有关实验装置或现象描述正确的是
图2溶液褪色，加热后不恢复
图3烧瓶中形成喷泉
图4制取少量氨气
图5石油分馏
下列关于实验现象的描述不正确的是
科学实验是人类获取科学知识验证科学理论的重要手段其中对实验现象的正确描述很重要以下实验现象描述正确的
红磷在空气中燃烧，产生大量白雾
细铁丝在氧气中燃烧，火星四射，生成白色固体
氢氧化钠溶液与硫酸铜溶液混合产生蓝色沉淀
硫在空气中燃烧发出蓝紫色的火焰
下列对有关实验现象的描述正确的是
下列有关实验现象的描述不正确的是
正确观察描述实验现象是同学们必备的实验技能右图所示的两个实验现象都有错误请加以改正实验⑴将燃着蜡烛迅
下列实验现象描述正确的是
下列实验现象描述正确的是
下列关于实验现象的描述中正确的是
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试判断下列各种情况中小灯泡L1和L2的连接情况．开关断开时灯L1发光L2不发光
8分Wellington:Huaweihasstartedarugby﹣themedmediacampaigninabidtowinoverNewZealand'spublicafterthecountry'ssecurityagencyblockedtheChinesetechnologygiant'sequipmentfrombeingusedinanationwideInternetnetwork. 5GwithoutHuaweiislikerugbywithoutNewZealandadsinNewZealand'stwolargestnewspapersreadalongsideaphotoofplayerscompetinginaball.Largepostersalsoappealtothecountry'sloveofthesport.InNovemberNewZealand'sGovernmentCommunicationsSecurityDepartmentGCSDtoldSparkitcouldn'tuseequipmentfromHuawei﹣theworldslargesttelecommunicationequipmentcompany﹣inthebuildingofits5Gnetworkbecauseanunspecificsignificantnetworksecurityriskwasidentified.SparkisnowintheprocessofseeingifitcanmakechangestopreventthoserisksalthoughGCSDhasdeclinedtopubliclysayhowthatwouldhappen. Huawei'snewspaperadgoesontoarguethedecisionwouldmeanlessadvancedtechnologyandhigherpricesforNewZealandcustomers.TheadscomeafterthecompanylastmonthpubliclyofferedtoonlyuseNewZealandratherthanChinesestafftobuildthenetwork﹣inabidtoeasefears﹣andcalledforanurgentmeetingwiththegovernmentdenying否认therehadbeenanywrongdoing. WesternspyagencieshaveincreasinglyraisedsecurityconcernsaboutHuawei﹣China'slargesttelecommunicationscompany﹣overwhattheysayarepossiblelinkstotheChinesegovernmentwiththeUnitedStatesreportedlypressingFiveEyesintelligencenetworkallies同盟国toavoidthecompany.AustraliaandCanadawerethefirstcountriestobanHuaweifromabuildingof5Gnetworks. Thecompanyhasrepeatedlydeniedaccusations. NewZealand'stoppoliticianshaverepeatedlydeniedtheGCSDdecisionwasinfluencedbyotherWesternpowersandsayit'sabouttheparticulartechnologybeingsuggestednotChina.TheyhavealsodeniedsuggestionsNewZealand'sdiplomatictieswithChinahavebeentenseoverthedecisionwiththeofficialpromotionofamajorChina﹣NewZealandtourismprojectnowpostponed. 1WhydidHuaweimakethead A.ToaskNewZealandersforadvice. B.TotellNewZealandershowpowerfulitis. C.TogetsupportfromthepublicinNewZealand. D.ToarguewiththegovernmentofNewZealand. 2WhatwillhappenifNewZealandersforceHuaweiout A.TheywillbeblamedbyChinese. B.TheywillbetrickedbyAmericans. C.Theywillloseachanceofbeingstronger. D.Theywillmissadvancedtechnologyandpaymore. 3WhydoesGCSDrefusetostatetherisksclearly A.Theyaresecret. B.Theyareimaginary. C.Theyaredifficulttodecide. D.Theyarebeyonddescription. 4WhichcountryplaysthekeyroleinthecampaignagainstHuawei A.Australia. B.USA. C.NewZealand. D.Canada.
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如图所示当开关闭合其他开关断开时L1L2串联当开关闭合其他开关断开时L1L2并联
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Ithinkifyoupracticerunningyoucan thefirstprize奖
Jimexplains解释everythingso thatallherstudentscanunderstandhim
10分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. IwasusedtobeahealthygirlbutmorethantwoyearsagoIgetintothehabitofeatingalotofjunkfoodandsnacks.InadditionIspentalotoftimelayonthesofawatchingTVanddoinglittleexercise.AsaresultIputonsuchmuchweightthatIfounddifficulttoclimbthestairs.SoIdecidedtochangemyunhealthylifestyle.Ibegantohaveabalancingandhealthydiet.Ialsotookpartinvarioussportsactivitysuchasswimmingskatingrunningorplayingbasketball.OneyearlateIbecameasfitasbefore.
10分AccordingtodatafromtheU.S.DepartmentofHealthandHumanServicesapproximately70percentofyouthreportwitnessingbullyingatschool.Thisisaseriousconcerngiventheimpactofbullying.1Forexamplechildrenwhoengageinbullyingandthosewhoarealsovictimsofbullyingtendtoreporthigherlevelsofdepressionandanxiety.Therearepreventionprogramsandschool﹣basedinterventions调停todealwithbullyingbehaviorsandtheemotionalconsequences.2Herearesomesuggestionsforthemtohelpchildrenwhoengageinbullyingandthosewhoarevictimsofit.Stopbullyingbeforeitstarts.3It'simportanttoidentifywhatbehaviorscanbeinvolved.Alsoremindyourchildthatbullyingcouldleadtoothernegativeconsequenceslikebeingkickedoutofschool.Makeyourhomeabully﹣freezone.Don'tallowbullyingtohappeninyourhome.Childrenlearnacceptablebehaviorfromtheirparents.It'simportanttomodelgoodexamplesofnegotiatingsocialrelationships.4Watchforsignsthatyourchildisbeingbullied.Somekidsmaynotreportbullyingtoparentsorotheradults.Potentialsignsofbullyingmayincludehesitationaboutgoingtoschoolorsadness.Ifyourecognizesignsofbullyingletthemknowyou'retheretosupportthem.5Discusswaystocopewithbullyingsinceadultsandteachersarenotalwayspresenttopreventchildrenfrombeingbullied.Athometeachthemhowtobemoreconfident.It'salsoimportanttohelpyourchildidentifyteachersandfriendswhocanhelpthem.A.Talkwithyourchildrenaboutbullying.B.Teachyourchildhowtohandlebeingbullied.C.Howeverparentscanplayanimportantroleinbullyingprevention.D.Decadesofresearchhaveidentifiedthepsychologicaleffectsofbullyingonchildren.E.ResearchershaveexaminedtheemotionalconsequencesofbullyingamongAfrican﹣Americanchildren.F.Asaparentyoumayhaveanunderstandingofbullyingeitherdirectlyorindirectlyfromyourchildhood.G.Exposingchildrentooverlystricthomeenvironmentsmayputthematahigherriskofengaginginbullying.
10分Nowadayspeoplewanttoknowyourwebsite.1Yourwebsiteisanelectronicmeetingplaceforyourfamilyfriendsandpotentiallymillionsofpeoplearoundtheworld.Bestofallyoumaynothavetospendacent.Thewebisfilledwithallkindsoffreeservicesandallittakesissometimeandcreativity.Thinkofyourhomepageasthestartingpointofyourwebsite.2Yoursitecanhaveoneormorepagesdependingonhowyoudesignit.Whilewebpagesvarygreatlyintheirdesignandcontentmostuseatraditionalmagazinelayout.Atthetopofthepageisabanner横幅.Nextcomesagreetingandshortdescriptionofthesite.Picturestextsandlinkstootherwebsitesfollow.Beforeyoustartbuildingyoursitedosomeplanning.3Nextgatherupthematerialsthatyouwanttoputonthesite.Whiletherearenorulesyouhavetofollowthereareafewthingstokeepinmind.4Ifyouwanttoomuchatthebeginningyoumaynevergetthesiteofftheground.Youcanalwaysaddtoyoursite.Lessisbetter.Mostpeopledon'tliketoreadalotoflongtextsonline.Breakitintosmallpieces.Sinceitcantakealongtimetodownloadlargefiles.Havetheright.Don'tputanymaterialonyoursiteunlessyouaresureyoucandoitlegally.5.A.Startsimply.B.Makeitcolorful.C.Drawaroughlayoutonasheetofpaper.D.Thinkaboutwhomthesiteisforandwhatyouwanttosay.E.Alwaysremembertogetthepermissionfromthewriterfirst.F.Havingawebaddressisalmostasimportantasowingastreetaddress.G.Likethetableofcontentsofabookormagazinethehomepageisthefrontdoor.
8分Theregularworldpresentedtousbyourfivesenses﹣youcouldcallitreality1.0﹣isnotalwaysthemostuser﹣friendlyofplaces.Wegetlostinunfamiliarcities;wemeetpeoplewhoselanguagewedon'tunderstand.Sowhynottrytheimprovedversion:augmentedrealityARorreality2.0ARtechnologyaddscomputer﹣producedimages图象ontherealworldviaamobilephonecameraorspecialvideoglasses. EarlyformsofARarealreadyhere.WiththerightdownloadssmartphonescandeliverinformationaboutnearbyATMsandrestaurantsandotherpointsofinterest.Butthat'sjustthebeginning.Afewyearsfromnowthequantityofinformationavailablewillhaveincreasedhugely.Youwillnotonlyseethatthere'saChineserestaurantonthenextblockbutyouwillbeabletoseethemenuandreadreviewsofit. Thisiswherethenextrevolutionincomputingwilltakeplace:intheinterface界面betweentherealworldandtheinformationbroughttousviatheInternet.Imaginebubblesfloatingbeforeyoureyesfilledwithcoolinformationaboutanythingandeverythingthatyouseeinfrontofyou. Let'sjumpaheadtotenyearsfromnow.Apersontryingtofixtheircarwon'tbereadingabookwithpictures;theywillbewearingadevicethatprojectsanimated3﹣Dcomputergraphicsontotheequipmentunderrepairlabellingpartsandgivingstep﹣by﹣stepguidance. ThewindowontotheARworldcanbeasmartphoneorspecialvideoglasses.Butintenyears'timethesewillhavebeenreplacedbycontactlenses隐形眼镜withtinyLEDswhichpresentsomethingatareadabledistanceinfrontoftheeye.Soadeafpersonwearingtheselenseswillbeabletoseewhatpeoplearesaying. Thequestioniswhileweareallabsorbedinournewaugmentedrealityworldshowwillwebecommunicatingwitheachother 1Whatdoesthetextmainlytalkabout A.Thenextinformationtechnologyrevolution. B.Earlyformsofaugmentedrealitytechnology. C.Thedifferencesbetweenreality1.0andreality2.0. D.Therelationshipbetweenpeoplelivinginreality2.0. 2WhatdoestheunderlinedworditrefertoinParagraph2 A.Themenu. B.Theblock. C.Therevolution. D.Therestaurant. 3WhataretinyLEDsusedtodo A.Protectpeople'seyes. B.Showtextandimages. C.Warnusersofdangers. D.Replacevideoglasses. 4What'stheauthor'sattitudetowardsARtechnology A.Doubtful. B.Disapproving. C.Favourable. D.Ambiguous.
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