【未来能源研究所】克服重型卡车和港口氢气使用的需求障碍-2026.1_第1页
【未来能源研究所】克服重型卡车和港口氢气使用的需求障碍-2026.1_第2页
【未来能源研究所】克服重型卡车和港口氢气使用的需求障碍-2026.1_第3页
【未来能源研究所】克服重型卡车和港口氢气使用的需求障碍-2026.1_第4页
【未来能源研究所】克服重型卡车和港口氢气使用的需求障碍-2026.1_第5页
已阅读5页,还剩67页未读 继续免费阅读

下载本文档

版权说明: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

文档简介

OvercomingDemandBarrierstoHydrogenUseinHeavy-

DutyTrucksandPorts

AaronBergman,AlanKrupnick,KatarinaNehrkorn,andYuqiZhu

WorkingPaper26-03January2026

AbouttheAuthors

AaronBergmanisafellowatResourcesfortheFuture(RFF).PriortojoiningRFF,

hewastheLeadforMacroeconomicsandEmissionsattheEnergyInformation

Administration(EIA),managingEIA’smodelinginthoseareas.BeforeworkingatEIA,

BergmanspentalmostadecadeinthepolicyoficeattheDepartmentofEnergy,

workingonabroadarrayofclimateandenvironmentalpolicies.Bergmanhasworked

intheWhiteHouseattheOficeofScienceandTechnologyPolicy,managingthe

QuadrennialEnergyReviewandhandlingthemethanemeasurementportfolio,andattheCouncilonEnvironmentalQuality,workingoncarbonregulation.Bergmanentered

thefederalgovernmentin2009asaScienceandTechnologyPolicyFellowwiththe

AmericanAssociationfortheAdvancementofScience,afterworkinginhighenergy

physics.

AlanKrupnickisanRFFseniorfellowanddirectoroftheIndustryandFuelsProgram.

Krupnickisanexpertontheoilandgassector,reducinggreenhousegasemissions

fromthisandtheindustrialsectors,andcost-benefitanalysis.Inparticular,Krupnick’s

recentresearchfocusesongreenpublicprocurement,decarbonizedhydrogenand

taxcredits,anddevelopingmarketsforgreennaturalgas.Hisportfolioalsoincludes

guidingthevalueofinformationagendacoveredbyourVALUABLESinitiativewith

NASA,thevaluationofreducingasthmarisks,estimatingthevalueofstatisticallife,

andissuesofregulatoryreform.

KatarinaNehrkornisaresearchassociateatRFFwhoseresearchspansacross

internationalclimatepolicyandindustrialdecarbonization.NehrkornearnedherBA

ineconomicsfromtheUniversityofMichigan,afterwardsworkingatDeloitte’sRisk

andFinancialAdvisorydivisionfortwoyears.In2023,shecompletedherMScin

EnvironmentalEconomicsandClimateChangeattheLondonSchoolofEconomics.

YuqiZhuisapolicyanalystexperiencedineconomicsandpublicpolicy,withafocusonenergymodeling,financialanalysis,andindustrialdecarbonization.Hewasasenior

researchassociateatRFF.PriortoRFF,heworkedinthefinancialservicesindustry,

includingrolesincorporatedevelopmentandstrategy.Heholdsbachelor’sdegreesincomputerscienceandeconomicsfromtheUniversityofPennsylvaniaandamaster’s

degreeinpublicpolicyfromtheHarvardKennedySchoolofGovernment.

ResourcesfortheFuturei

OvercomingDemandBarrierstoHydrogenUseinHeavy-DutyTrucksandPortsii

AboutRFF

ResourcesfortheFuture(RFF)isanindependent,nonprofitresearchinstitutionin

Washington,DC.Itsmissionistoimproveenvironmental,energy,andnaturalresourcedecisionsthroughimpartialeconomicresearchandpolicyengagement.RFFis

committedtobeingthemostwidelytrustedsourceofresearchinsightsandpolicysolutionsleadingtoahealthyenvironmentandathrivingeconomy.

Workingpapersareresearchmaterialscirculatedbytheirauthorsforpurposesof

informationanddiscussion.Theyhavenotnecessarilyundergoneformalpeerreview.TheviewsexpressedherearethoseoftheindividualauthorsandmaydiferfromthoseofotherRFFexperts,itsoficers,oritsdirectors.

SharingOurWork

OurworkisavailableforsharingandadaptationunderanAttribution-

NonCommercial-NoDerivatives4.0International(CCBY-NC-ND4.0)license.Youcancopyandredistributeourmaterialinanymediumorformat;youmustgive

appropriatecredit,providealinktothelicense,andindicateifchangesweremade,andyoumaynotapplyadditionalrestrictions.Youmaydosoinanyreasonable

manner,butnotinanywaythatsuggeststhelicensorendorsesyouoryouruse.

Youmaynotusethematerialforcommercialpurposes.Ifyouremix,transform,orbuilduponthematerial,youmaynotdistributethemodifiedmaterial.Formoreinformation,visit

/licenses/by-nc-nd/4.0/

.

ResourcesfortheFutureiii

Abstract

Hydrogenhasthepotentialtoserveasazero-carbonenergycarrierasanelement

ofazero-carboneconomy.Butthehighcostofcleanhydrogenandinfrastructure

needsforscaling,plusthedismantlingofpoliciestopromoteitsproductionand

use,havehampereditsspread.Focusingontheheavy-dutytruckingandports

sectors,wereviewthepolicylandscapehereandabroadandtheobstaclesfacedbycleanhydrogeninthesesectors.Wepresentpotentialpoliciesforovercomingthe

demand-sideobstaclesinthesetwosectors,withsomefocusonthenascentBidenadministration’sJointOftakeProducerAuctionanditscontrastwithotherpolicy

ideas,suchascontractsfordiferences.Thediscussionisorganizedaroundthe

obstaclesofhighcost,uptakeoffuelcellvehiclesandtheconstructionofarefuelingnetworkforheavy-dutytrucking.Amongseveralsuggestions,wefindthathydrogenuseinheavy-dutytruckingrequiresmorecoordinatedinvestmentduetotheneedforextensiverefuelinginfrastructurealongtransportationcorridors.

OvercomingDemandBarrierstoHydrogenUseinHeavy-DutyTrucksandPortsiv

Contents

1.Introduction1

2.Background2

2.1.Trucking2

2.1.1.Long-HaulTrucking3

2.1.2.CurrentUseofHydrogeninTrucking3

2.1.3.ChallengestoHydrogenUseinTrucking4

2.2.Ports5

2.2.1.GovernanceofUSPorts6

2.2.2.PotentialUsesofHydrogeninPorts6

2.2.3.PortEquipment6

2.2.4.TruckingandDrayage8

2.3.ChallengestoUseofHydrogeninPorts8

3.CurrentPolicyLandscapeforHydrogen9

3.1.GeneralHydrogenPolicy9

3.1.1.BroadFederalPolicies9

3.2.HydrogenTruckingPolicy10

3.2.1.FederalPolicy10

3.2.2.StatePolicy11

3.3.Ports12

3.4.InternationalHydrogenPolicy13

3.4.1.Trucks13

3.4.2.Ports14

4.Demand-SideSupport14

4.1.Subsidies15

4.2.PublicProcurement15

4.3.AMCs15

4.4.MilestonePayments16

4.5.Regulation17

4.6.CfDs18

ResourcesfortheFuturev

5.ApplicationofDemand-SideSupportstoHydrogeninPortsandTrucking18

5.1.HydrogenCost19

5.1.1.GeneralConsiderations19

5.1.2.OftakersinPortsandHeavy-DutyTrucks20

5.1.3.StructuresforOftakerInvolvement20

5.1.4.AuctionDesign20

5.1.5.Demand-SidePoliciestoAddressHydrogenCost21

5.2.FuelCellVehicleCosts24

5.2.1.DirectSubsidy24

5.2.2.CfDs24

5.2.3.AMCsandGovernmentProcurement25

5.2.4.OtherDemandIncentives25

5.3.BuildingRefuelingInfrastructure25

5.3.1.CorridorDesignations25

5.3.2.SubsidiesandCfDs26

6.Conclusion27

References29

OvercomingDemandBarrierstoHydrogenUseinHeavy-DutyTrucksandPorts1

1.Introduction

Toaddresstherealityofclimatechangecausedbygreenhousegas(GHG)andits

threatstoourhealth,economyandenvironment,decarbonizingourenergyuseis

essential.Someusesaremoreeasilyandcheaplydecarbonizedthanothers,althougheventhesefacemanychallenges.

Thetransportationsector,whichincludeslight-,medium-,andheavy-dutyvehicles,

bothonroadandof(aswellasaircraft,pipelines,shipsandboats),isnowthebiggestUSsourceofanthropogenicGHGemissions,andthemedium-andheavy-duty

subsector(whichmakesroughly23percentof

thissector’semissions

)isparticularlychallengingtodecarbonizebecausegasolineanddieselfuelarecheapandubiquitousandcanberapidlyusedtorefuelvehicles(EPA2024b).

Giventhesechallenges,particularlyforheavy-dutytrucking,planstodecarbonizehaveturnedtohydrogen,preciselybecauseofitshighenergydensity,zerodirectemissionsandabilitytorapidlyrefuel.TheDepartmentofEnergy’s(DOE)roadmapsand

pathwaystodecarbonizationreports1indicatethatinheavy-dutytrucking,hydrogencancompetewithfossilfuelsatthehighesthydrogenpriceofanyothersector,makingitoneofthe“low-hangingfruit”sectorsforcleanhydrogenapplications.

Thesereportshavealsoidentifiedportsasanopportunityforhydrogenbecauseof

theirmotorizedequipmentandcentralization.Forklifts,inparticular,areripeforcleanhydrogenuse,andmorethan95,000forkliftsalreadyusehydrogen.Portopportunitiesalsoincludetruckingandcargo-movingmachinery(suchascranes,reachstackers,

andstraddlecarriers).

Forallofcleanhydrogen’spromise(and,inCalifornia,use)inthesesubsectors,

realizingitsdecarbonizingbenefitsrequiresproducingitwithlow-orzero-carbon

techniques.Asof2019,theUnitedStatesproducedabout10millionmetrictonnesperyearofhydrogen,primarilyintherefinerysectorandforammoniaandfertilizer.Almostallofthisisgrayhydrogen,2meaningithasCO2emissionsasaby-product.

DuringtheBidenadministration,aseriesofincentiveprogramswereenactedto

subsidizecleanhydrogenproductionprojects,asthecurrentcostistoohightoobtainprivatefinancingandrealizetheeconomiesofscaleandlearningbydoingneededtobringproductioncostsdown.Theseincentivesincludedthehydrogenhubsprogram

1TheDOELiftofreportsarenolongeravailableontheDOEwebsite.Copiesofthehy-drogenreportarestillavailableonotherwebsites,suchas

/content/

does-pathways-commercial-liftof-clean-hydrogen

.

2Thelistofhydrogencolorshasseeminglygrownwithoutbound.Wewillrestrictour-selvestograyhydrogen(fromsteammethanereformingwithoutcarboncapture),bluehydrogen(fromreforming,steammethaneandotherwise,withcarboncapture),and

greenhydrogen(fromelectrolysis,usuallywithsomepurchaseofa

cleanelectricity

attribute

coveringtheelectricityused).

ResourcesfortheFuture2

intheInfrastructureInvestmentandJobsAct,whichwasintendedtohelpcentralizecleanhydrogen’sproductionanduse(mitigatingdistributionconcerns)andsubsidizeproduction.

Itbecameclearthatsubsidizingthesupplyofhydrogenwasnotsuficienttodriveitsdeployment;demand-sideincentiveswerealsoneeded.Hence,DOEusedatleast$500millionofahubprogram’s$8billioninfundingtobegindevelopingademand-side

supportmechanism.DOEawardedacontracttoacoalitionofgroups(H2DI)tosetitup.However,thismovementcametoahaltwiththesecondTrumpadministration.

EvenasmanyoftheprogramsenactedduringtheBidenadministrationarebeingundone,3itislikelythatanyfuturehydrogendeploymentwillrequiredemand-

sidesupport.Although,aswewilldescribe,theH2DIinitiativesettledononesuchmechanism,awidearrayofotheroptionsexist,whichwewillreview.Wefocusonthetwopromisingsectors,portsandheavy-dutytrucking,todescribeandevaluatedemand-sidesupportoptionsthatwouldapply.

WebegininSection2byreviewingbothsectors,theirpotentialforuseofhydrogen,

andthebarrierstoitsusage.InSection3,wereviewthecurrentpolicylandscape

supportingcleanhydrogenuseinthesesectors,withafocusonpoliciesintheUnitedStatesandalsotouchingoninternationalpolicies.InSection4,wereviewdemand-sidepolicies.Finally,inSection5,welookatapplicationsofspecificdemand-sidepoliciestoaddressparticularbarrierstotheuseofhydrogeninportsandheavy-dutytrucking.WeconcludeinSection6.

2.Background

Webeginbyreviewingthetruckingandportssectors,focusingontheopportunitiesforandbarrierstohydrogenuse.

2.1.Trucking

Heavy-dutytruckingisahighlyfragmentedindustry,withmultiplebusinessmodelsandsubsectors,makingitdificulttoregulateandnecessitatingtailoredsolutionsfordecarbonization.

Truckingasanindustrycanbebroadlysplitintoshort-andlong-haulsegments,usingdiferentvehicles,unloadingatdiferentfrequencies,andcoveringdiferentdistances.Short-haultrucksgenerallytravelwithina200-mileradius,operatingwithincitiesorregions,andarelighter-dutyvehiclescarryinglighterpayloadsthanlong-haultrucks

3TheOneBigBeautifulBillAct(OBBBA)sunsetsthekeycleanhydrogenproductionincentive(Section45VoftheInternalRevenueCode),andthehubprogramisunderreview,withsupportwithdrawnfromtwohubsasofthiswriting.Thestatusofthede-mand-sidesupportmechanismisalsounclear.

OvercomingDemandBarrierstoHydrogenUseinHeavy-DutyTrucksandPorts3

(FHWA2000).Long-haultrucksoftendrivemorethan200milesandtravelbetweencitiesorstates.Whenconsideringdecarbonizationsolutions,thesediferencesafectwhetherbattery-electricorhydrogenfuelcelltrucksaremoresuitable.Traditionally,battery-electrictruckshavebeenconsideredbettersuitedforshort-haul,lighter-dutyvehicles,withhydrogenapotentiallybetteroptionforlongerroutesbecauseofits

greaterenergydensityandfasterrefuelingtimes.Wefocusonlong-haultrucking,asthisiswherehydrogencanplaythebiggestrole.4

2.1.1.Long-HaulTrucking

Heavy-dutytruckingmakesupasignificantportionofoveralltruckingemploymentandmileage.AccordingtotheUSCensus,in2022over1.1millionpeoplewere

employedinthegeneralfreighttruckingindustry(NAICS5code4841),with901,044ingenerallong-distancetrucking(48412)(NCSESetal.2025).

Thesectorcanbefurtherdividedbybusinessmodelintothreebroadcategoriesof

logisticsoperations:for-hirecarriers,owner-operators(alsotechnicallyconsidered

for-hire),andin-house/privatecarriers.For-hirecarriersarecompanies,suchasUPS,

FedEx,andJBHunt,thattransportgoodsforothercompanies.Owner-operatorsare

self-employedindividualswiththeirowntruckingbusiness(undertheirownauthorityorcontractedouttoothercompanies).Finally,privatecarriersincludebusinesses,suchasAmazon,thatoperatetheirownlogisticsandowntheirtrucks.

In2022,ofthe623,108businessesregisteredasNAICS48412(GeneralFreight

Trucking,LongDistance),91percent(565,000)werecategorizedas“nonemployer”

firms,representingthelargestshareofowner-operatorsinthelong-distancetruckingindustry(NCSESetal.2025).Largercompanies,whetherfor-hireorprivate,makeuparelativelysmallshare.Thetop50largestcompaniesgeneratelessthan30percentofoverallmarketrevenue(AEO2024).

Thesedistinctionsareimportantfordecarbonizationpolicybecausesmall,owner-

operatorfleetshavelimitedabilitiestoobtaincapitalinvestmentandperformlong-

termplanning.Privatecarriersmayalsoactmorelikesatisficers,seekingtoearnanacceptableamountofprofit,asopposedtobeingprofitmaximizers.Largecompanies,ontheotherhand,oftenhavesophisticatedlong-termcostmodelingandgreater

abilitytomakelargecapitalinvestments.

2.1.2.CurrentUseofHydrogeninTrucking

Althoughhydrogenhasbeenidentifiedasapotentialdecarbonizationsolutionfor

long-haultrucking,itscurrentuseintheUnitedStateislimited.Totalcostofownership(TCO)modelingcomparinghydrogentruckstopotentialalternativeshasfoundthat

4SeeNehrkornetal.(2024)foranoverviewoftheissuesassociatedwithhydrogen-fueledheavy-dutytruckingandcomparisonstousingbatteriesforpower.

5NAICSreferstotheNorthAmericanIndustrialClassificationSystem.

ResourcesfortheFuture4

theTCOoffuelcellelectricvehicles(FCEVs)ismuchhigherthandiesel,butparity

couldbereachedovertime.WiththeInflationReductionAct(IRA)incentivesandcostprojections,FCEVscouldhavereachedparityasearlyas2034(Lednaetal.2024).

However,otherestimatesputthatat2050(Burnhametal.2021)orbeyond.When

comparedtoelectricoptions,studiesfindconflictinganswersastowhichapplicationswillhavealowerTCO(Hunteretal.2021;Lednaetal.2024;Burnhametal.2021).

Hydrogenfuelcelltrucksarestillinthedemonstrationandearlycommercialization

phases,andtheiravailabilityisverylimited.Severalstart-upmanufacturers,such

asNikolaandHyzon,havefocusedspecificallyonbuildingthem;however,bothof

thesefirmshaverecentlygonebankrupt.Legacymanufacturerscontinuetoinvest

inhydrogenvehicles,withDaimler,Volvo,PACCAR,Toyota,Honda,andHyundai

allinvolvedinmanufacturingFCEVstosomeextent.Thisincludesa

jointventure

betweenPACCARandToyota

whereToyotasuppliesthefuelcellmodulesto

PACCAR,whichinsertsthemandrelatedequipmentintoKenworthandPeterbilttruckbodieswithnon-hydrogen-relatedequipment.Accordingtointerviews,Toyotahas

thecapacitytoproduce30,000fuelcellstacksperyear,whichcombineindividualfuelcellstoformtheheartofthe

fuelcellpowersystem

,andhascompletedsuccessfulpilotsatthePortofLA.

Theotherfundamentalrequirementforwidespread,scaledhydrogenuseis

infrastructureavailability.IntheUnitedStates,hydrogeninfrastructureislimitedand

almostexclusivelyinCalifornia.AccordingtoDOE’sAlternativeFuelingStationLocator,72publicorprivateUSrefuelingstationsareavailable(55inCalifornia),withfive

accessibletoheavy-dutyvehiclesandonlytwoopentothepublic(DOE2025).Bothoftheavailablepublicheavy-dutyrefuelingstationsareinCalifornia.

2.1.3.ChallengestoHydrogenUseinTrucking

Tobetterunderstandthebarrierstohydrogenadoptioninheavy-dutytrucking,

weinterviewedstakeholdersacrossthevaluechain,includingasupplieroffuelcellsystems,adieseloriginalequipmentmanufacturerpilotingFCEVs,andacompanydevelopingfuelcellsforportequipmentandstationary/mobilepower.Acrosstheseconversations,threeconsistentbarriersemerged:lackoffuelinginfrastructure,highhydrogencosts,andthehighupfrontcostofhydrogentrucks.

Infrastructurelimitationsremainakeychallengeforlarge-scaledeployment.Althoughhydrogenfuelcelltrucksoferakeyadvantageoverbattery-electricmodelswith

theirrapidrefuelingtime,therefuelingnetworkisextremelylimitedandheavily

concentratedinCalifornia.Thesestationsrequirelargecapitalinvestments,which

carrysignificantriskwithoutdedicateddemand.DOE(2021)foundthattheaverage

hydrogenstationrequires$1.9millionincapital.Thesecostsincreaseasthecapacitydoes,withtheAFLEETmodelassumingstationcostsof$1,892,967–3,448,461,

dependingonthedispensingrate(Burnham2023).Thiscanbecomparedtomodeledcostsfordieselstationsofabout$172,000.Oneintervieweeestimatedthata300–400mileroutewouldrequireatleast2–3stationstobesuitableforlong-haultrucking.Thisraisesthequestionofhowinfrastructureiscoordinated,whereitisplaced(e.g.,along

OvercomingDemandBarrierstoHydrogenUseinHeavy-DutyTrucksandPorts5

majortruckroutesconnectingtwoormoremajorcities—termedbysomea“hydrogencorridor”approach),andwhoisresponsibleforbuildingit.

Anothermajorbarriertowide-scaledeploymentisthecostofhydrogen.One

intervieweesuggestedthatthehighestpricethatcouldmakehydrogenfeasiblefor

truckingendusesis$8–9/kg.Asofthiswriting,Californiastationshaveprices

ashigh

as$36/kg

,butthiswouldcomedownwithahigherrateofcapacityuse.Becauseof

fuelcells’greatereficiencycomparedtodiesel,transportationapplicationshaveahigherwillingnesstopaythanotherendusesandcanacceptaslightlyhigherprice,butcurrentpricesarestillfarfromeconomicallyfeasible.Adiferentinterviewee

expressedthatparitywithdieselcouldbereachedataround$6–7/kgorpreferably$4–5/kg.

Beyondthecostofhydrogen,fuelcellvehiclesremainmuchcostlierthandiesel.

Existingvoucherprogramshelpsignificantlyclosethisgap,andlong-termeconomiesofscalecouldbringFCEVcostsdownsignificantly.Nonetheless,thehighpriceof

hydrogenfuelcelltrucksstillcreatesproblemsforinsurabilityandfinancing.Onpaper,ahydrogentruckcancostover$600,000atsmallproductionvolumesandaround$350,000atfullproductionlevels(comparedtoa

dieseltruckataround

$117,000

)(Nehrkornetal.2024),requiringinsurancecompaniestotakeonmore

risk.Additionally,technologicaluncertaintiesstillsurroundFCEVs,furtherincreasinginsurancerisk.Althoughinsurerscanchargemore,thiscreatesadditionalcostsforowners.

TheresalemarketisanothercriticalissueforthecostofFCEVs.Thelong-haul

truckingindustryreliesheavilyonresale,withdieseltrucksoftenlogging750,000

milesormoreandchanginghandsseveraltimesovertheirlifecycle.Theopportunitytoresellthevehicledecreasestheefectivecost,anditisoftenowner-operatorswhobuyusedvehiclesfromlargerfleets.Astheirfueleficiencydecaysovertime,long-

haultrucksareoftenshiftedtomoreregionalroutesthatcanrequireavastlydiferentrefuelingstructurethanthecorridormodel.Moretechnologicaluncertaintyarisesoverthetrucks’usefullife,addingmorerisktosecondarypurchasers.Withanunknown

resalepathway,fleetownersmaybeevenmorereluctanttocommittohydrogen.

2.2.Ports

TheUnitedStateshasmorethan300ports,managedunderamixofgovernancemodelsthatincludestates,counties,municipalities,andprivatecompanies(DOT2025).Portsemployover2.5millionworkers,withthelargestconcentrationsof

jobsandGDPcontributionsinCalifornia,Texas,Florida,Louisiana,andNewJersey(AmericanAssociationofPortAuthorities2024).

Portsaremajorsourcesofenergydemandandproduction.Theyhostfacilitiesfor

electricitygenerationandpetroleumrefining,withmultiplestationaryandmobile

sourcesofdieselconsumption.Thisincludesdiesel-poweredequipment,suchas

forklifts,yardtractors,andcargohandlers,andelectricgeneratorsrangingfrom5kWto10MW.Mobilesourcesspanocean-goingvessels,harborcraft,drayagetrucks(usedforhaulingshippingcontainersrelativelyshortdistancesfromtheport),long-h

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。

评论

0/150

提交评论