简介:摘要在学习H2S与Na2S溶液性质时,不少学习者对于H2S和Na2S溶液与其它物质所进行的化学反应,往往只看到其共同点即S2-离子的强还原性,而忽略了H2S与Na2S溶液本身的酸碱性对反应的影响,从而很容易得出H2S与Na2S溶液分别与同一氧化性物质反应呈现同样实验现象的错误结论。本文以SO2和FeCl3溶液与两者的反应为例对这一问题进行了一些初浅的讨论。
简介:目的探讨小儿Amyand’s疝(Amyand’shernia,AH)的临床特点及治疗方法,提高诊治水平。方法回顾性分析2004年1月至2010年12月作者收治的18例AH患儿的临床资料。结果18例患儿中,男性17例,女性1例,中位年龄1.2岁(23d至5岁3个月)。临床特点:腹股沟区肿块18例,呕吐11例,发热10例;9例白细胞增高;5例腹部X线检查显示肠梗阻;3例彩超可见阑尾“双边”影,2例见条索状低回声。治疗方法:10例因合并阑尾炎,行疝囊高位结扎术时一并切除阑尾;8例仅行疝囊高位结扎术。18例均痊愈出院。术后病理检查提示单纯性阑尾炎5例,化脓性阑尾炎3例,坏疽性阑尾炎2例。结论小儿AH临床少见,I型AH处理上跟一般嵌顿疝相同,将阑尾直接还纳入腹腔;Ⅱ、Ⅲ型AH则需行阑尾切除。根据术中情况正确处理不同类型的AH,一般均可取得较好的疗效。
简介:TheEU,theUnitedStatesandothereconomies,withtheintentiontoimplementunilateraltrademeasuresBorderCarbonAdjustments,imposeemissionreductionpressureondevelopingcountries.Onceimplemented,themeasureswillhavegreatimpactonChina'sforeigntrade.Usingtheinput-outputtablein2007,thispaperhadanalyzedtheinfluencesonChina'sforeigntradeasawholeandsub-sectorsinthreetaxratesscenarios.TheresultsshowedthatthetarifflevelofChina'sexportswillincreaseby3.6%-6.3%ifthetaxwasleviedonexportsembodiedemissions,andby1.0%-1.7%ifleviedonexportdirectemissions.In2007,theformertotalamountofcarbontaxwasaboutUS$42.6-73.0billion,4timesthatofthelatter.Basedonexportembodiedemissions,sectorslargelyinfluencedwerenon-traditionalenergyintensiveones,suchastextile,etal.Thesesectorsshouldbeencour-agedtocarryoutindustrialupgrading,raisingthevalue-addedofexportgoods,andreducingtheirembodiedemissionsbyreductionofenergyintensity.Takingintoaccountofthecomplexityofdatacollection,thetaxleviedonproductsdirectemissionismoreoperational.Theresultsshowedthatthefivetopsectorsmostaffectedwereotherchemicalmaterials,processingofpetroleumandnuclearfuel,coking,smeltingandrollingofferrousmetalandtextile.Mostofthemwereenergyintensivesectors.Therefore,adjustingexportproductsstructure,andcontrollingtoofastdevelopmentofenergyintensiveindustriesarealsoimportantstrategiesinChina.