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    山东11选5百度乐彩 www.ywneihua.com.cn,China'senvironmentministersaidhe"feltguilty"and"wantedtoreproachhimself"aswidespreadairpollutionhasharassedpeople'slives,anofficialstatementsaidSaturday.ChenJining,ministerofenvironmentalprotection,madetheremarkswhenholdingapressconferencelateonFridayinBeijing,introducingChina'seffortsonairpollutionprevention.Sincethebeginningoflastwinter,heavyairpollutionhashappenedrepeatedlyinmanyplacesinChina,coveringlargeareaandlastinglong,whichdisruptedproductionactivitiesandharassedpeople'severydaylives,Chensaid.Thepublicfeltanxiousaboutthesmogproblem,hesaid.Detailedanalysisshowedemissionsfromautomobileshavebecametheprimarysourceofurbanatmosphericfineparticlesinmajorcities,accountingfor31.3percentinBeijing,29.2percentinShanghaiand28percentinHangzhou,accordingtotheenvironmentminister.FineparticlesaredefinedbytheU.S.EnvironmentalProtectionAgencyascompoundsthathaveadiameteroflessthanorequalto2.5micrometers.Substancesthatmayformtheseparticlescomefrompowerplants,industrialfacilities,agriculturalpractices,motorvehicles,amongothers.Chensaidtheministrywasevaluating20cities'emergencyplansindealingwithheavyairpollution,hopingtoimprovetheirresponseability.ThecitiesincludeBeijing,Tianjinand18othercitiesinHebeiandsurroundingprovinces.Inspectionshadfoundsomecitiesfailingtotakeeffectivemeasuresfollowingalerts,ortheirmeasureswereimpracticable,Chensaid.Theministrywillenhancesupervisiononwhetherlocalgovernmentshavepracticeditsprecautions,accordingtotheminister.Chenvowedtotakeconcretestepsandemploymorestringentandeffectivemeasurestodealwithoutstandingenvironmentalproblemsandimproveenvironmentquality.Chinahasbeencleaningitsenvironmentandwillcontinuetoimprovetheresponseoflocalgovernmentstopollution,Chensaid.Chinahasmadeimprovementsinenvironmentdespitestrongheadwinds,suchasaneconomicstructureburdenedbyheavyindustry,anenergymixreliantonfossilfuels,andenvironmentallyunfriendlylifestyles,accordingtoChen.China'snationalobservatoryonTuesdayissuedaredalertforfoginanumberofnorthernandeasternregions,thefirstevernationalredalertforfog.Meanwhile,northChinahasbeenunderhigh-levelsmogalertssincelateDecember.TheBeijing-Tianjin-Hebeiregionandneighboringprovinces,theareahithardestbysmog,aremajorcoalconsumersandarehometoalargeshareofChina'ssteel,cokeandcementproductionfacilitiesaswellasautomobiles,accordingtoChen."Therootcauseoftheregion'ssmogproblems,fromalong-termperspective,istheuncleanindustrialandenergymix,whichrequirebigchanges,"Chensaid.HesaidthatmonitoringresultsintheBeijing-Tianjin-Hebeiregionshowthatthegovernment'seffortshavepaidoffinthepastfewyearsastheaverageconcentrationofPM2.5fellbyabout30percentin2016comparedwith2013.However,thereseemstobelittlewinterairqualityimprovement.Unfavorableweatherconditionsandinefficientwinterheatinghavealsocontributedtothelingeringsmog,Chenadded.Toaddresstheproblemsinwinter,Chinawillphaseoutuncleanandinefficientcoal-firedboilers,encourageoff-peakindustrialproductionandenhancescrutinyandpunishmentforviolationsoftherules.7日涉事学校对记者否认了“教师打肿学生下体”这一说法,并发表关于此事情况说明公布监控录像。

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2008北京奥运老山自行车场馆建声设计 发布日期:2013-01-24 14:15 点击:64

        老山自行车馆是我国唯一的木制赛道自行车室内赛场,2008北京奥运会的场地自行车比赛就在该馆内举行,赛后将作为国家队的日常训练基地和国际自行车联盟的亚洲培训基地。馆内可容纳6000名观众,其中3000个座位是永久席位,另外3000个临时坐席.馆内容积约23.5万立方米。
       作为自行车比赛的场馆,钢屋盖跨度达150m,中心点高33m,容积庞大。声学设计的主要任务是:控制室内混响时间满足扩声系统所要求的语言清晰度,同时防止出现回声、声反馈啸叫等声缺陷。

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