




kok电子竞技权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
kok电子竞技:文档简介
3/26/2024
科碧恩-普拉克(中国)涂浩明
2015-12上海HaomingTu环境及食安危机下中国聚乳酸工业的
第二期发展及挑战
3/26/20242Challengetotraditionpolymerindustry
-传统橡塑行业面临的挑战PlasticPollution¬sustainable(consumepetrochemicalresource)
白色污染且非可持续发展(消耗石化资源)3/26/20243PlasticPollution-白色污染3/26/20244Challengetotraditionpolymerindustry
-传统橡塑行业面临的挑战Debateonfoodcontactsafetyandbodycontactsafety
争议-食品接触安全及人体接触安全ConcernsaboutStyrene(关于苯乙烯类塑料制品食品接触安全的忧虑)3/26/20245“Lastmonth,76scientistswroteajointlettertoCongress
notingthattheWorldHealthOrganizationalsolistedformaldehydeasaknowncarcinogen,andstyreneasapossiblecarcinogen.TheydefendedtheReportonCarcinogensas“consistentwithinternationalscientificconsensus.”**ExtractfromthelettertoCongress:“StyreneisregulatedasaHazardousAirPollutantbyEPA,andconsideredpossiblycarcinogenictohumansbytheWorldHealthOrganization.The12thROClistingofstyreneas“reasonablyanticipatedtobeahumancarcinogen”isconsistentwithinternationalscientificconsensusregardingstyrene’stoxicity.“TheCancerLobbyBy
NICHOLASD.KRISTOFPublished:October6,20123/26/20246ConcernsaroundStyrene
ECHA/RAC:Damagingtheunbornchild
苯乙烯单体对胎儿的:uropeanChemicalAgency(ECHA)NewsAlert:By
CommitteeforRiskAssessment(RAC)
Helsinki,07December2012
“RACagreedtoclassifystyreneascausingdamagetothehearingorgansthroughprolongedorrepeatedexposureviainhalationandasasubstancesuspectedofdamagingtheunbornchild““ForbotheffectstheRACopiniondeviatedfromtheproposalfromDenmarkwhohadoriginallyproposedtoclassifystyreneascausingdamagetothenervoussystemthroughprolongedorrepeatedexposureviainhalationandasasubstancewhichmaydamagetheunbornchild.“http://echa.europa.eu/view-article/-/journal_content/c89bdb13-09e9-497c-8e73-ddae13a842c83/26/20247MOPS:MovingoutofPolyStyrene(&ABS)
(Globalmarket>10milliontons)
脱离苯乙烯类塑料运动:千万吨市场规模
MajorPSusersconsider“movingoutofPS”duetothefood/healthsafetyconcerns,styrene/PSprice,sustainability,etc.PLA(rigid)andPP(soft/flexible)aretheircandidatestoreplacePS,ABS,etc.Styreneproducersstopexpansionorshutdownoldplantsduetosafetyconcernsonstyreneasapotentialcarcinogenicchemical.Pricegoesupto1.6USD/kg.PS:Pricegoesto~1.90Euro/kg(~2.4USD/kg)inEuropeduetoshortageandtherisingpriceofstyrene.PSpriceinAsiaisstilllownow.November7,2012
[Source:ICISnews]:EuropeanstyrenepricesareexpectedtosoarfollowingShellChemicals'declaration
offorcemajeureonstyreneatitsMoerdijksite.3/26/20248Concernsaboutmelaminetableware…….
关于密胺(三聚氰胺-甲醛树脂)餐具食品接触安全的忧虑新闻图片:遭查封的密胺餐具在更换产品标签后再次流入市。绦(京华时报2009年)新闻图片:(密胺)“置物盘”勿当餐具使用(网易新闻2012年)2015年8月起,“台北市政府各机关、学校之办公厅舍及校区推动禁用一次性及美耐皿餐具”。::(1)2009年台湾市售美耐皿餐具100%均检出三聚氰胺析出。
(2)2011年高雄医学大学职业安全卫生研究所指出美耐皿餐具是岛内三成人
三聚氰胺暴露的主要来源.
(3)台湾卫生与福利部认为,虽然美耐皿餐具三聚氰胺析出岛内标准为2.5ppm,
但在使用过程中,三聚氰胺析出会在人体中不断积累,三聚氰胺析出也将
随着餐具老化而增加甚至超标,实际上2.5ppm的标准难以执行!MelaminetablewareisforbiddenbyTaipeiGovernment3/26/20249台北市长柯文哲出席
“友善台北好餐具标章”活动内容来源:http:///cn/newspapers/20150723000491-260102http:///tw/tw-mswx/news/2009/06-01/1715325.shtml/xw/twxw/2011/10/2621363.htmlhttp:///s?wd=paperuri%3A%284a9ef55e63fa35e15ba0d816001181bc%29&filter=sc_long_sign&sc_ks_para=q%3D%E7%BE%8E%E8%80%90%E7%9A%BF%E9%A4%90%E5%85%B7%E6%BA%B6%E5%87%BA%E9%AB%98%E6%BF%83%E5%BA%A6%E4%B8%89%E8%81%9A%E6%B0%B0%E8%83%BA%E4%B9%8B%E7%9B%B8%E9%97%9C%E7%A0%94%E7%A9%B6&tn=SE_baiduxueshu_c1gjeupa&ie=utf-8http:///cn/realtimenews/20150723002957-260407CorbionPuracPLAcradletocradlelifecycle3/26/202410Bio-based生物质来源
Bio-degradable生物可降解
3/26/202411Whatisbioplastic?什么是生物高分子Bio-basedOil-based(fossilfuel)BiodegradableNotBiodegradablePLAPHA(PHB,PHBV…)PPC(~30%biocontent)bio-PETbio-PPBio-PEStarchblends
(PP/starch,PE/starch,~20-30%biocontent)PBATPBS,PBSAPTTPCL
PETPPPEPSABSPVCBioplasticproperty&pricematrix3/26/202412Bioplasticneat
resinRemarkMarket
priceHeatperformanceTensilestrengthElongationatbreakPLLA(highopticalpurity
PLA)Bio-based,100%biocontent,Biodegradable,~18-20
rmb/kg~100-110C(HDT-B)*crystalline~50Mpa~3%PLA(mediumorlowopticalpurity)Bio-based,100%biocontent,Biodegradable,~16-18rmb/kg~50-60C(HDT-B)*amorphous~50Mpa~3%PHA(PHB,PHBV…)Bio-based,100%biocontent,Biodegradable,~35rmb/kg
<85C(VicatVST)~15-30Mpa~10-700%PBAT(PBS,PBSA…)Oil-based,0%biocontent,Biodegradable~25-30rmb/kg
<90
C(VicatVST)~35
MPa~500-700%PPCPartialbio-based,~30%biocontent,Biodegradable~25rmb/kg~45-50C(VicatVST)
>10MPa>30%PP/StarchPE/StarchPartialbio-based,~20-30%biocontent,Notbiodegradable~10-15rmb/kg~85-110C(VicatVST)~15-30MPa>20%3/26/202413GlobalPLAsales:Doubledevery3-4yearsNatureWorks70KTline150KT140KTPLASalesvolume=10KT×2(calendaryear-2003)/3PLAvolumedoubledevery3-4years!CorbionisPuracBiochem+CaravanIngredients+(former)CSMHolding
公司总部位于荷兰阿姆斯特丹GlobalMarketLeaderinLacticAcid全球乳酸行业领先者Naturalpreservation&fortificationforFood
(食品)BiobasedingredientsforChemical&Pharma(化学医药中间体)MonomersforBioplastics(生物塑料)>80yearsofexperience80多年发展历程
IntroducingCorbion–科碧恩简介
Biobasedproducts,poweredbynature,designedbyscience,&deliveredthroughourdedication3/26/2024141983PuracintroducesPLAforthebiomedicalmarket
PURAC医用级PLA投入市场20085kTpaLactideMonomersplantinBarcelona,Spain
西班牙5kt丙交酯工厂投产201275kTpaLactideMonomersplantinRayong,Thailand
泰国75kt丙交酯工厂投产
Globalpresence–科碧恩公司全球分布3/26/202415CorbionPurac’sroleinthePLAvaluechain–科碧恩聚乳酸市场战略
3/26/202416TechnologyPushDevelopPLApolymerizationWorkwithpartnersonPLAApp’sSupportconversionofPLASugarfeedstockLA&LactideproductionPLApolymerproductionCompoundproductionConversiontoproductsBrandownerRetailerConsumerPartnershipsDevelopmentofPLAsupplychainDevelopmentofmarketsandapplicationsCorefocus-Scale&capacity,costleadership-Best-in-classprocessingtechnology-ApplicationsupportNEWCorbionworkswithandsupportsallplayersinthePLAvaluechainTechnologyPushDevelopPLApolymerizationWorkwithpartnersonPLAApp’sSupportconversionofPLAMarketPullPLApromotion&communicationCreatesustainabilityawarenessWorkwithleadingCorps&(N)GOsHigh-quality,Low-costlactide
高性价比丙交酯原料单体Madefromnon-GMOrawmaterials非转基因原料单体来源FastPLLAcrystallizationrate高光纯PLLA具有较高结晶速率HighheatperformancePLLA高光纯PLLA具有更好耐热性能PLLApotentialforgooddurability高光纯PLLA具有开发耐久应用的潜力UniquePDLAnucleatingtechnology独特的高光纯PDLA成核剂技术Advantagesofhighopticalpurity(>99.8%)L&DLactide
高光纯L型及D型丙交酯–高光纯聚乳酸原料单体3/26/202417协助推广开发聚乳酸产品市场PLAPolymerization:Hisun,Hengtian-Yangtze,Jiuding,SUPLA…聚乳酸合成:海正,恒天长江,九鼎,允友成….PLAcompounding&applicationdevelopment:PolyAlloy,XinDa,RongSolar,Nanyi….
聚乳酸共混改性研发:台湾盛聚,哈尔滨鑫达,江苏荣晟,浙江南益….PLAtechnology&innovation:CAS-Beijing,CAS-Ningbo,SichuanUNIV,JiangnanUNIV
聚乳酸技术创新:中科院北京化学所,中科院宁波材料所,四川大学,江南大学OtherPartners:EsunBrightChina,XinFu
………
其他合作伙伴:易生光华伟业,鑫富,荣盛…..Corbion-Purac’sPLAapplicationdevelopmentpartnerinChina
科碧恩-普拉克在中国的聚乳酸应用开发合作伙伴3/26/202418期待更多合作伙伴!19ConfidentialChinaBioPlasticProjects:Phase1(2014)
PLA:2-10
KT
PHBV
group:1-10KT
PBS/ATgroup:2-20KT
PPC/PBC:1-10KTStarch-blending:>10KT鑫富PBS/AT天安PHBV远东PBAT金发PBSA/T和兴PBS意可曼P3/4HB天冠PPC中科金龙PPC中海油PPC国韵P3/4HB九鼎PLA海正PLA蒙西PPC汉丰Starch比奥格Starch长江化纤PLA华丽Starch宏力Starch
三房巷PBC台州邦丰PPC华盛PBS/AT金辉PBS/AT屯河PBS/AT同杰良PLA汇盈PBS/ATLimitedPLAproducers:MainlyNatureworks(import),Hisun5KTsmallplants.
聚乳酸树脂生产厂:NatureWorks(进口),国内海正为主,其他小厂试生产LimitedPLAfiberproducers:MainlyFENCimporting,FIT(XingNeng/XingGao),BWC,CL
聚乳酸纤维生产厂:远东纺织(进口),国内以新能新高为主,无纺布:必可成,昌隆LimitedlocalGovernmentsupport:onPLAproduction,notPLAmarket
中国政府补贴:以聚乳酸生产为主,而非市场应用
ManyPLAproducers:Hisun,Hengtian-Yangtze,Jiuding,SUPLA,Foxconn,COFCO,TJL,…多个聚乳酸厂及技术:海正,恒天长江,九鼎,允友成
,富士康,中粮,同杰良
….SOE,10Kscale,governmentregulation,supplychain,compoundingplants,non-wovenfiber
央企介入,万吨级厂,吉林江苏限塑法规,供应链建立,共混厂,无纺布/纤维…..ChinaPLAindustry:Phase1(2004-2014)entersPhase2(2015-2020)
中国聚乳酸产业:从第一期(2004-2014)进入第二期(2015-2020)3/26/202420群雄并起,进入井喷期Phase1:FocusonPLAproductiontechnologybottleneck解决聚乳酸生产技术瓶颈Phase2:NeedtofocusonPLAmarketandapplication需以聚乳酸的市场及应用为主ConfidentialChinaLA/PLA/Fiberphase2:100KTscale2016-2017:接近十万吨树脂/纤维允友成SUPLA光华伟业EsunBC杲信GaoXin中粮COFCO富士康Foxconn海正Hisun昌隆ChLn新能新高FIT/Cha前沿QianYan必可成BWC远东化纤FENC曦茂XiMao龙都LongDuYangtze恒天
长江Hengtian同杰良TJL金丹JinDan中粮格拉特B&G百盛BaiSheng豆丁BendsL玉之润YZR美亚AP武藏野MSN金玉米GoldenC九鼎Jiuding新宁XinNing3/26/202422ChinaPLA/FiberPhase2:ApplicationTechnologyTrends(聚乳酸应用技术趋势)
PLAcompounding,branching,&copolymerizationtechnologydevelopment
聚乳酸的共混改性,交联,共聚技术的开发ApplicationofPLLAcompoundforhighendsemi-durableparts&tableware
(3C/automotive/foodcontactsafety…)e.g.replacingmelaminetableware
高光纯聚乳酸改性料在高端半耐久产品,如餐具等领域应用
(3C/汽车/食品接触安全…)如取代美耐皿餐具ApplicationofPLAfilmblowing/PLAmulchfilm/BOPLAfilm/castingfilmetc…聚乳酸吹膜,农地膜,双向拉伸膜及流延膜的应用及改进ApplicationofPLAextrusionfoamingandmouldingfoaming(replacingEPS)
聚乳酸挤出发泡及模压发泡的应用(取代EPS)ApplicationofPLAfiberanddisposiblenon-wovenhygienefabrics聚乳酸纤维及无纺布一次性卫材制品的应用
PLAisafamilyof(co-)polymers–聚乳酸简介3/26/202423R-enantiomer(D)S-enantiomer(L)PDLA(103)175°C
160°CPLAcopolymer>10%RinPLAAmorphousNoTmIncreasingTmandcrystallinityStereoblockPLA(31)200°CStereocomplexPLAStereo
complexPLA
(31)230°CPLLA(103)BasedonPLAhomo-polymers均聚物PLAco-polymers共聚物ImprovedPLAperformanceopensuphighaddedvaluemarkets
不断提高的聚乳酸材料性能使其应用向高附加值领域拓展3/26/202424DisposablesSemi-durablesTimeValue&PerformanceDurablesProgressinPolymerScience37(2012)1657-1677EffectsofopticalpurityandmolecularweightonTgandMAX.crystallinityofPLA–光学纯度和分子量对Tg和最大结晶度的影响3/26/202425光纯越高,Tg相对较高当Mn>100kg/mol,Tg保持不变分子量降低&光纯提高最大结晶度及结晶速率提高RecommendationofPLAgradesfordifferentprocessingtechnologies--适用于不同加工条件下的聚乳酸分子量区间3/26/202426薄壁注塑注塑吸塑&片材挤出流动性结晶速率最大结晶度纤维Molecularweightloss&moisturetake-upspeedofPLAversustime–聚乳酸水解降解速率&吸水速率
3/26/202427ProgressinPolymerScience33(2008)820-852CorbionPLAprocessingguidelineTemperature>Tgandwithhighhumidity,FASTPLAhydrolysisdegradation温度高于Tg时,快速水解降解Moisturecontentfrom50ppmto250ppmafter15min水分含量从50ppm到250ppm仅需15minCorbionrangeofPDLAresins:PURAPOLD070nucleatingadditiveto
reducecycletimePURAPOLD130forstereocomplexPLA
Benefits:HighstereochemicalpurityFoodcontactapprovedUsingGMOfreebiomassBiobasedPDLAhomopolymerresins–CorbionPurac--PDLA树脂3/26/202428PDLAresin–drivingperformancePSPVCABSPCPETHDPELDPEPPPLAPLLA/PDLA成核体系Increasingheatperformance立构复合体系PLLA/PDLAAmorphous CrystallineSugarfeedstockLA&LactideproductionPLApolymerproductionCompoundproductionConversiontoproductsBrandownerRetailerConsumer3/26/2024PLLAhomopolymerresin–Hisun--PLLA树脂Hisun
rangeofPLLAresins:Revode290forInjectionmoldingRevode190
forextrusion&injectionmoldingBenefits:PLLAHighstereochemicalpurityFoodcontactapprovedUsingGMOfreebiomassBiobasedCompostable(EN13432)HisunRevodeproductrange3/26/202430ClosingtheperformancegapvsPS,PP&ABS–PLLA/PDLA共混改性体系热变形温度缺口冲击强度BlendsofPLLA&PDLA
-developmentalsamplesareavailablefortesting-ProcessingHighHeatPLA:Crystallinitydevelopmentininjectionmoldedpart(1mmthick)vs.coolingtime
–PDLA成核体系实现聚乳酸耐热制品的快速结晶3/26/2024325s10s15s20s30s40sDSCoverlayofmineralfilledn-PLLAatdifferentmoldcoolingtimes,
Tmold
100°C,samplesquenchedincoldwaterHighheatPLAT-sensitivePLAmoldcoolingtimes2.5mm
thickness3/26/202433Effectofnucleatingpackageandmoldtemperatureoncrystallizationtime–PDLA成核体系
注塑模具温度与结晶时间关系Optimummoldcoolingcondition
dependsonformulationandpartgeometryPDLAnucleationallowslowermoldTforthickerpartsPDLAnucleationalways
upto2xfasterwaterimmersiontest@90oCDurabilityevaluationbywaterimmersiontest–水浴老化测试3/26/202434Retentionofmechanicalproperties>50%after72hrswaterimmersiontest@90oC水浴老化测试72小时,力学性能保留率>50%CustomertestsofkitchenproductmadewithCorbionPuracBlendB:injectionmoldingtosemi-crystallinePLA–聚乳酸注塑餐具评估实验3/26/202435SampleTest1Mold60°C2Mold20°C3Mold20°C
+
30min@100°C4Mold100°CSinkmarks缩痕NoNoNoNo1mheightfalltest(afterIM,Microwaveanddishwashertest)跌落测试OKOKOKOKStaining染色性测试RemovableRemovableRemovableRemovableMicrowavetest(H2O)
微波炉测试OKOKOKOKDishwasher50cycles洗碗机测试50个周期FairlyOKNOKNottestedOKScratchresistance耐刮擦测试BetterthanPPBetterthanPPBetterthanPPBetterthanPPCupdimensions:approx.?10cmand20cmheightBenefitsHighheatresistanceBiobased&recyclableExcellenthighglossfinishExcellentimpactresistanceHighdimensionalstabilityallowsfortighttolerancesAdditionalPartners:PLAhousingsforconsumerelectronics–聚乳酸
注塑产品在电子领域的应用3/26/202436TheworldsfirstPLAtouchscreencomputerSugarfeedstockLA&LactideproductionPLApolymerproductionCompoundproductionConversiontoproductsBrandownerRetailerConsumerCompoundsmadeforCorbionbyaGermanresearchinstituteNaturalFibers30%NFloadingMatrixmaterials:PLLAL130–PLLAhomopolymerBlendA–NucleatedPLLAblendbyPDLABlendC–Impactmodified,nucleatedPLLAbyPDLANaturalFiberfilledPLAcompounds–聚乳酸/天然纤维复合材料3/26/202437SugarfeedstockLA&LactideproductionPLApolymerproductionCompoundproductionConversiontoproductsBrandownerRetailerConsumerExcellentHeatPerformanceof30%NF-filledCorbioncompoundsbasedonsemi-crystallinePLLA–30%天然纤维填充聚乳酸复合材料耐热性能3/26/202438高耐热温度HDT-B160°C,HDT-A>80°C缺口冲击强度6.5kJ.m-2Benefits:ReducedcarbonfootprintDimensionstabilityThermalresistanceupto140°CwithfiberreinforcementShockresistancedownto-40°CAgeing,chemical&hydrolysisresistanceVerygoodcolorability,naturallookwithbio-fillersScratchresistanceImpactresistanceUVresistance3/26/202439PLAforautomotiveparts–聚乳酸/天然纤维复合材料在汽车配件领域的应用PLAParts:courtesyofR?chlingAirfilterhousingandinteriorautomotivetrimcomponentsNaturalfiberfilledPLABenefits:BiobasedHighheatresistanceRecyclableGoodprocessingeconomicsCanbeprocessedonexistingPSlinesPLAforhighheatthermoforming3/26/202440PLAcoffeecupsPartnerforlids:BenefitsHighheatresistanceBiobased&recyclableExcellentsurfacefinish,goodwear&scratchresistanceVarioussurfacestructurespossiblePLAforconsumerappliances3/26/202441HighGlossCasingBiobased&recyclableExcellentsurfacefinish,goodwear&scratchresistanceHighheatresistanceVarioussurfacestructurespossiblePartners:PLAforfurniturepaneling3/26/202442Biobased&recyclableDurableGoodimpactresistanceHighheatresistanceExcellentsurfacefinish&colorabilityPartners:PLAforchildren’stoys3/26/202443Benefits:Highheatresistance–upto140-180°C
耐热温度140-180°CTransparent
良好的透明Reducedshrinkage
150oC收缩率<2%Foodcontactapproved
食品接触安全Typicalapplications:ProtectivefilmsLabelsPackagingMaterials:PLA/PDLAmix(50/50)FullstereocomplexPLAfilmforhighheatresistance
--sc-PLA双向拉伸膜3/26/202444Surfboardcore:madefromExpandedPLAfoamBenefits:Biobased:nontoxicbuildingblocksColorfast:UVresistantIndustriallycompostableCradletoCradle?certifiedPLAforsportinggoods3/26/202445Surfboard-ExpandedPLAcoreSynbra-aPuracpartnerSynbraproducts:PLAbiofoamReplacingExpandedPSHighheatandspecialtyPLAhomopolymersReplacingPS,PPandABStyperesins46Synbra5.000T/yPLApolimerizationplant,TheNetherlandsBuiltbySulzerChemLactidetoMoltenPLAtofiber.Lowcost
丙交酯聚合后,聚乳酸熔体直纺纤维,
大幅降低成本Skin-coreBi-Componentfiber:Hotairtosealthelowopticalpurityskin
皮心纤维.热风粘结低光纯外皮2x(1-2KT)now.Building10KTlineduemid-2016Hengtian-Yangtze:directspinningfromlactidetoPLAtofiber
恒天-长江:熔体直纺纤维3/26/202447
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
kok电子竞技:最新文档
- 《派出所消防汇报》课件
- 2025年中考语文文言文总复习-学生kok电子竞技-专题02:文言文阅读之虚词意义和用法(讲义)
- 广东省清远市2022-2023学年高三上学期期末教学质量检测英语试题
- 旅行社后勤管理工作概述
- 健身行业教练技能提升总结
- 餐饮行业市场推广总结
- 服装行业设计师工作经验分享
- 皮革行业助理的工作概括
- 儿童用品行业营业员工作总结
- 证券公司前台工作总结
- “三排查三清零”回头看问题整改台账
- 大连市小升初手册
- 《自然辩证法》课后习题答案自然辩证法课后题答案
- 造价咨询结算审核服务方案
- 中国人民财产保险股份有限公司机动车综合商业保险条款
- 燃气工程监理实施细则(通用kok电子竞技)
- E车E拍行车记录仪说明书 - 图文-
- 人才梯队-继任计划-建设方案(珍贵)
- 《健身气功》(选修)教学大纲
- 王家岩隧道工程地质勘察kok电子竞技(总结)
- 《昆明的雨》优质课一等奖(课堂PPT)
评论
0/150
提交评论