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下列变化中，只涉及物理变化的是（ ）
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Cu2O广泛应用于太阳能电池领域．以CuSO4NaOH和抗坏血酸为原料可制备Cu2O． 1Cu2+基态核外电子排布式为． 2SO42﹣的空间构型为用文字描述Cu2+与OH﹣反应能生成[CuOH4]2﹣[CuOH4]2﹣中的配位原子为填元素符号． 3抗坏血酸的分子结构如图1所示分子中碳原子的轨道杂化类型为推测抗坏血酸在水中的溶解性填“难溶于水”或“易溶于水”． 4一个Cu2O晶胞如图2中Cu原子的数目为．
AmongallthetouristattractionsinSydneythemagnificentOperaHouseistheshiningstar.OntheedgeofBennelongPointatongueoflandstickingoutintoSydneyHarborthisUNESCOWorldHeritageSiteconsistsofacomplexofroofsshapedlikehugeshellsorbillowingsailsthatmixbeautifullywithitswaterfrontlocation.Todayvisitorscanadmirethegreatbeautyofthebuilding.Muchmorethananoperahousethestructureencompasses包含theatersstudiosaconcerthallrehearsalandreceptionroomsrestaurantsandaspectacularopen﹣airforecourtoverlookingtheharborandcity.AmericanarchitectLouisKahnoncesaid'Thesundidnotknowhowbeautifulitslightwasuntilitwasreflectedoffthisbuilding.'TipsandTacticsBookseatsforproductionswellinadvance.Performancescommencepromptlysovisitorsshouldallowenoughtimetoaccessthebuildingcollectticketsandstowcloakslargebagsandjackets.Considerenjoyingamealinoneoftherestaurantstoenjoythestunningharborviews.OneofthebestsitestophotographtheOperaHouseisMrs.Macquarie'sChairintheRoyalBotanicGardensorfromthewateraboardaharborcruise.GettingtotheSydneyOperaHouseVisitorscancatchaSydneyBustravelbyCityRailorhopaboardaSydneyFerrytoCircularQuaywhichisa5to7minutewalkfromtheSydneyOperaHouse.Afreeshuttlebusforelderlyandmobility﹣challengedpatrons顾客runsbetweenCircularQuaynearStandEundertheCahillExpresswayandtheVehicleConcourse.BikeparkingisavailableundertheSydneyOperaHouseMonumentalSteps.Wilson'sSydneyOperaHouseCarParkislocatedat2MacquarieStwithvehicleaccessnexttotheSydneyOperaHouseForecourt.AdmissionTicketpricesvaryfromattractiontoattraction.LocationBennelongPointSydney.1WhichofthecharacteristicsofSydneyOperaHousemightattractvisitorsmost?A.Itshistoricalcontext.B.Itsuniquearchitecture.C.Itswaterfrontlocation.D.Itssuperbharborviews.2IfyouareavisitortoSydneyOperaHouseyoucan.A.takeaferrydirectlytoSydneyOperaHouseB.rideafreeshuttlebuswithoutanyrestrictionsC.takeanequallygoodphotofromanyangleD.driveacarto2MacquarieStandparkthere
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如图所示质量为3m的重物与一质量为m的线框用一根绝缘细线连接起来挂在两个高度相同的定滑轮上已知线框的横边边长为L水平方向匀强磁场的磁感应强度为B磁场上下边界的距离线框竖直边长均为h．初始时刻磁场的下边缘和线框上边缘的高度差为2h将重物从静止开始释放线框上边缘刚进磁场时恰好做匀速直线运动滑轮质量摩擦阻力均不计．则下列说法中正确的是
TheurgetoshareourlivesonsocialmediaPeoplehavelongusedmediatoseereflectionsofthemselves.Longbeforemobilephonesorevenphotographydiarieswerekeptasawaytounderstandoneselfandtheworldinwhichonelives.Inthe18thand19thcenturiesasdiariesbecamemorepopularmiddle﹣classNewEnglandersparticularlywhitewomenwroteabouttheireverydaylivesandtheworldaroundthem.Thesediarieswerenotaplaceintowhichtheypouredtheirinnermostthoughtsanddesiresbutratheraplacetochronicle记录thesocialworldaroundthem.Thediariescapturedtheeverydayroutinesofmid﹣19th﹣centurylifeandwomendiaristsinparticularfocusednotonthemselvesbutontheirfamiliesandtheircommunities.Diariestodayareforthemostpartprivate.ButthingsweredifferentfortheseNewEnglanddiaries.Youngwomenwhoweremarriedwouldsendtheirdiarieshometotheirparentsasawayofmaintainingkin血缘relations.Whenfamilyorfriendscametovisititwasnotuncommontositdownandgothroughone'sjournaltogether.Diariesarenottheonlymediathatpeoplehaveusedtodocumentlivesandsharethemwithothers.Wehavelongusedmedialikephotoalbumsbabybooksandevenslideshowsasameansofcreatingtraces痕迹ofourlives.Wedothistounderstandourselvesandtoseetrendsinourbehaviour.Wecreatetracesaspartofouridentityandpartofourmemory.Sharingeverydaylifeeventscanstrengthensocialconnectionandintimacy亲密感.Forexampleyoutakeapictureofyourchild'sfirstbirthday.Itisnotonlyadevelopmentalmilestonethephotoalsostrengthentheidentityofthefamilyunititself.Theactoftakingthephotoandproudlysharingitfurtherreaffirms再次证实oneasagoodandattentiveparent.notherwordsthemediatracesofothersfigureinourownidentities.Today'ssocialmediaplatformsarebyandlargefreetouseunlikehistoricaldiarieswhichpeoplehadtobuy.Todayadvertisingsubsidizes补贴ouruseofnetworkedplatforms.Thereforetheseplatformsencourageuseoftheirnetworkstobuildlargeraudiencesandtobettertargetthem.Ourpicturesourpostsandourlikesarecommodified﹣﹣thatistheyareusedtocreatevaluethroughincreasinglytargetedadvertising.Insteadofsocialmediamerelyconnectingusithasbecomeacraze狂热forinformationcontinuallytryingtodrawusinwiththepromiseofsocialconnectivity﹣﹣it'ssomeone'sbirthdaysomeonelikedyourpictureetc.There'samultibillion﹣dollarindustrypullingusintooursmartphonesrelyingonalongstandinghumanneedforcommunication.Theurgetobepresentonsocialmediaismuchmorecomplexthansimplynarcissism自恋.Socialmedidofallkindsnotonlyenablepeopletoseetheirreflectionsbuttofeeltheirconnectionaswell.
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在恒压NO和O2的起始浓度一定的条件下催化反应相同时间测得不同温度下NO转化为NO2的转化率如图中实线所示图中虚线表示相同条件下NO的平衡转化率随温度的变化．下列说法正确的是
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