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
“MineralSecurity”Policy
forElectricVehicleBatteryMinerals
SangitaGayatriKannanandMichaelToman
Report25-06March2025
AbouttheAuthors
SangitaGayatriKannanisaPhDstudentintheMineralandEnergyEconomics
programatColoradoSchoolofMines.ShealsoisaresearchassistantwiththeCriticalMaterialsInnovationHub,anEnergyInnovationHuboftheUSDepartmentofEnergy.
MichaelTomanisaseniorfellowwhoworkedatResourcesfortheFuturein1978–2003
andreturnedduring2021–2024;henowservesasaconsultant.Hiscurrentresearch
interestsincludecriticalmineralsfordecarbonization,carbondioxideremovals,
marketsforemissionreductioncredits,andclimatechangepoliciesindeveloping
countries
Acknowledgements
TheauthorsaregratefulforinformativeconversationswithAnupBandivadekar,DougBohi,EmilioCastillo,RoderickEggert,andseveralcritical-mineralindustryexpertswhoagreedtooff-the-recordinterviews;andforhelpfulcommentsonadraftofthepaperfromBeiaSpiller.TheauthorsalsoaregratefultotheHewlettFoundationforfinancially
supportingtheresearch.Responsibilityforthecontentofthepaperliesexclusively
withtheauthors.
ResourcesfortheFuturei
“MineralSecurity”PolicyforElectricVehicleBatteryMineralsii
AboutRFF
ResourcesfortheFuture(RFF)isanindependent,nonprofitresearchinstitutionin
Washington,DC.Itsmissionistoimproveenvironmental,energy,andnaturalresourcedecisionsthroughimpartialeconomicresearchandpolicyengagement.RFFis
committedtobeingthemostwidelytrustedsourceofresearchinsightsandpolicysolutionsleadingtoahealthyenvironmentandathrivingeconomy.
TheviewsexpressedherearethoseoftheindividualauthorsandmaydifferfromthoseofotherRFFexperts,itsofficers,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
Thispaperdiscussesthenatureofquantityandpricerisksfromtheexerciseofmarketpowerovercriticalminerals,withanemphasisonthemineralsusedforelectricvehicle(EV)batteries.ThefocusisespeciallyonrisksinvolvingChinasincethatcountryholdslargesharesintheprocessingandextractionofseveralbatteryminerals.Quantity
riskisthethreatofselectiveinterruptionsinthesupplyofcriticalmineralsavailabletotargetcountries.Priceriskisthethreatofhigherpricesbyrestrictingsuppliestothemarketasawhole,therebyextractingeconomicrentsfrombuyers.Keyfindingsincludethat(i)Chinaisunlikelytobeabletocontrolmarketallocationsofbattery
mineralstoimplementselectivesupplycuts,(ii)Chinatendstooverbuildmineral
processingcapacitytosafeguarddomesticsupplychains,andthat(iii)Chinahas
engagedinexportpricediscriminationforcertaincriticalminerals,butcareisneededincomparingthisrisktotheriskinvolvedwithmassiveinvestmentinnon-Chinese
mineralprocessingcapacity.
JELnumbers:Q37,Q34,F52
Keywords:criticalminerals.electricvehiclebatteries.marketpower.industrialpolicy.
“MineralSecurity”PolicyforElectricVehicleBatteryMineralsiv
Contents
1.Introduction1
2.OverviewofCriticalMineralAvailabilityRisks2
3.CriticalMineralQuantity-AvailabilityRisksforBatteryMinerals2
4.EvidenceRelevanttoUnderstandChina’sInvestmentandPricingDecisionsin
LithiumandCobaltMarkets3
4.1.Lithium:DataonCapacity,CapacityUtilization,andPrices3
4.2.Cobalt:DataonCapacity,CapacityUtilization,andPrices7
5.WhatDotheLithiumandCobaltDataSuggest?10
6.WhatElseMightBeGoingOn?12
7.China’sLeadinBatteryMineralsProcessing13
8.PolicyImplications14
9.ConcludingRemarks16
References17
“MineralSecurity”PolicyforElectricVehicleBatteryMinerals1
1.Introduction
Whiletheconceptof“mineralsecurity”forUScriticalmineralsisinterpretedin
differentways,concernsabouttheiravailabilityarisefrequently.Thisfollowsfromthedefinitionof“criticalminerals”:non-fuelmineralsthatplayanimportantroleinthe
economyornationalsecurity,arechallengingtoreplaceatleastinthenearerterm,andaresubjecttosomenotablepossibilityofdecreasedavailability(NationalResearch
Council2008).
Twotypesofconcernaboutcriticalmineralsecurityarefoundinpolicydebates.Bothinvolveactorswithlargemarketsharesintheextractionand/orprocessingofsome
criticalminerals.Oneisthethreatofselectiveinterruptionsinthequantityofcriticalmineralsavailabletoparticulartargetcountriesduetogeopoliticalconflict.Theotheristhethreatofhigherpricesfromtheexerciseofmarketpoweroversuppliesby
restrictingoutputs,therebyextractingeconomicrentsfrombuyers1Thisexerciseof
marketpoweralsocaninvolve“predatorypricing”—floodingthemarkettodrivepricesdownwhenthereisathreatofcompetitiveentry.2RapidgrowthinChineseprocessingcapacitytoahugescale,eventothepointofapparentglobalover-capacity,has
becomeasubjectofconcern(DOT2024;EuropeanCommission2023).
Thispaperdiscussesthenatureofquantityandpricerisksfromtheexerciseofmarketpowerwithafocusoncriticalmineralsusedforelectricvehicle(EV)batteries.These
includecobalt,graphite,lithium,manganese,andnickel.Thefocusisespeciallyon
risksinvolvingChinasincethatcountryholdslargesharesintheprocessingand/or
extractionofseveralbatterymineralscomparedtotherestoftheworld(ROW)(see
Spiller,Kannan,andToman2023).Theargumentsinthepaperarebasedonamixtureoflogicalreasoning,informationaboutmineralsuppliesandmarkets,informationaboutChineseindustrialpolicy,andoff-the-recordconsultationwithseveralindustryexpertsinvolvedindifferentpartsofcriticalmineralsupplychains.
1“Economicrents”isatermusedbyeconomiststodescribeprofitsgainedbytheexerciseofmarketpower,beyondthenormalreturnsoncapitalandpaymentsforotherinputs.
2Someobserverswouldaddconcernsoverpricevolatility,thecommonplaceupwardanddownwardmovementsofpricesthataredifferentthanpredatorypricedrops.Critical
mineralpricevolatilityisseenasamplifyingfinancial/investmentrisksfornewinvest-
mentsincriticalmineralsextractionorprocessing.However,pricevolatilityisubiquitousincommoditymarkets—especiallymarketsforcriticalminerals,whichtendtobethinandopaqueandhaveinelasticnearer-termsuppliesanddemands.
ResourcesfortheFuture2
2.OverviewofCriticalMineralAvailabilityRisks
Thegeopoliticalconcerninvolvesthethreatofsupplyreductionsorinterruptionstargetedatspecificcountries.Suchrestrictionscertainlywouldhaveeconomicconsequences.Theseriousnessofthisthreatdependscriticallyonthedegreeoftargetingthatispossible,whichdependsinturnontheabilitytolimitresaleandtransshipment.
Theeconomicconcernisthatacountrywithalargeshareofmineralproductionand/orprocessingcoulduseitsmarketpowertoraiseprices,alongwithpricecutswhenneededtodetercompetingsuppliersfromexpanding.Onewaytoexercisemarket
poweristorestrictoutputsofprocessedminerals,raisingpricesforallpurchasers—domesticandforeign.Inthiscase,theeconomicrentsgainedfromraisingprices
toforeignpurchasersneedtobebalancedagainstadverseeffectsondomestic
purchasers.Theotherwaytoexercisemarketpoweristhroughpricediscrimination,restrictingexportssothatpricestoforeignpurchasersexceedpricestodomesticpurchasers.Wediscussbothtypesofmarketpowerbelow.
Competitionfromothersdependsonhowquicklycompetitorscanexpandtheir
outputifpricesareabovecosts.Althoughsupplyelasticities(thepercentageresponseofsupplytoaparticularpercentageincreaseinprice)tendtobelowintheshort
term,marketscanadjustoverlongerperiods.Inthemedium-to-longterm,anupperboundonthepricethatcanbechargedtoextracteconomicrentisasustainedpricesufficienttodrawcompetitorsintotheindustry.
3.CriticalMineralQuantity-AvailabilityRisksforBatteryMinerals
Scanthistoricalevidenceexistsforsuccessfulimpositionoftargetedsupply
restrictions.Observershavepointedtothefallof2010,whenChinastateditwas
reducingexportsofsomerareearthelements(REEs)overanunrelateddisputewith
Japan.Pricesforthoseelementsincreasedtenfoldanddidnotdeclineuntilpartway
through2011.However,dataonJapaneseimportsduringtheperiodindicatenosuddenanddramaticshortfallindeliveriestothatcountry(Johnston2013,24–26;EvenettandFritz2023,32–33).EvenettandFritz(2023)furthershowthatthereisnosolidevidenceofselectivesupplycutstoanybuyerofREEsfromChinaovertheperiod2010–2019.Inpractice,anyrestrictionsinChineseexportsaffectedtheglobalmarketasawhole,notindividualcountries.
“MineralSecurity”PolicyforElectricVehicleBatteryMinerals3
Forbatteryminerals,thestructureofthemarketsmakesitunlikelythatatargeted
restrictiononsuppliescouldbesustained.Thesemineralslargelyaretradedthroughasignificantnumberofbilateraltradeagreementsbetweenindividualsuppliers
andpurchasers.ItwouldbeverydifficultforChinatopreventresaleofmaterialstocountriesaffectedbytargetedrestrictions,whichwouldineffectbecomerestrictionsonavailabilitytothemarketasawhole.3
4.EvidenceRelevanttoUnderstandChina’sInvestmentandPricing
DecisionsinLithiumandCobaltMarkets
4.1.Lithium:DataonCapacity,CapacityUtilization,andPrices4
China’sdomesticproductionoflithiumattheextractionstagehasbeenintherangeof15–24percentoftheglobaltotalduringtheperiod2011–2023(RoskillInformationServices2020a,2020b;USGS2012–2024).Extractionoflithiumoccurslargelyfrom
twotypesofdeposits—so-calledsurfacebrineandhardrock.Extractionfrombrine
depositsinvolvesconcentrationofthebrineinsolarevaporationpondsandthen
furtherchemicalprocessingtoproducerefinedlithium.Hardrock–basedoperationsprimarilyinvolvelithium-bearingores,themostvaluableofwhichisspodumene.
Processingoflithiumfromhardrockbasedmineralsinvolvesvariousprocessesto
obtainlithiumconcentrate,whichisfurtherrefinedtolithiumchemicals(Warren2021).Chinadoesnothavesignificantcomparativeadvantages(technologicalorgeological)forextractedlithium.Nonetheless,Chinahascontinuedtobuilddomesticcapacityforbothbrineandhardrocklithiumextraction.
3TheDecember3,2024,editionoftheNewYorkTimesreportedthatChinawasstoppingsalestotheUnitedStatesofseveralnon-batterycriticalmineralsincludinggallium,ger-manium,andantimony.Exportsofgraphite(abatterymineral)wouldcontinuebutwithin-creasedscrutiny(DavidPierson,KeithBradsher,andAnaSwanson,“ChinaBansRareMin-eralExportstotheU.S.,”theNewYorkTimes,December3,2024,
https://www.nytimes.
com/2024/12/03/world/asia/china-minerals-semiconductors.html
).Subsequently,
ChinaorderedcustomersfromothercountriesnottoallowtransshipmentstotheUnitedStates(KeithBradsher,“China’sCriticalMineralsEmbargoIsEvenTougherThanExpect-ed,”theNewYorkTimes,December9,2024,
/2024/12/09/
business/china-critical-minerals.html
).TimewilltellhowmuchChinacaninpracticeeffectivelyembargocriticalmineralsuppliestoselectedcountries,giventheworkingsofthemarketsfortheaffectedminerals.
4ThedatainthissubsectionandthenextcomefromRoskillInformationServices(2019,
2020a,2020b),andfromvariousyearsofannuallithiumandcobaltstatisticsfromthe
USGSNationalMineralInformationCenter.BecausetheRoskilldataareproprietary,abso-lutequantitiesfromthissourcecannotberevealed.
ResourcesfortheFuture4
China’sshareoflithiumrefiningcapacityhasgrownfrom44percentin2013toalmost76percentin2020(Figure1).Chinesecapacityhasgrownatanaverageannualgrowthrate(AAGR)of33percentfrom2013to2020(Figure2).Duringthissameperiod,
thecapacityforrefininglithiuminROWhasgrownatanAAGRofapproximately10
percent,consistentwiththedeclineofitssharefrom56percentto24percent(Figure1).Thus,whileROWroughlydoubledcapacityforrefininglithium,China’scapacity
increased7.5times.Similartrendsholdforquantitiesofrefinedlithiumproductionaswell,withChina’sshareinglobalrefinedproductionatapproximately65percentin2020.
Figure1.RefinedLithiumCapacityShare
100
Total%CapacityShare
90
80
70
60
50
40
30
20
10
20132014201520162017201820192020
RestofWorldChina
Sources:RoskillInformationServices2020a,2020b;USGeologicalSurvey(USGS)—variousyears.
Figure2.RefinedLithiumCapacity
LithiumCarbonateEquivalent
8
IndexedMetricTonne
7
6
5
4
3
2
1
20132014201520162017201820192020
Chinacapacity
RestofWorld
capacity
Note:Figure2showsrelativegrowthincapacities,withChineseandRestofWorld(ROW)capacitiesnormalizedto1.0in2013.
Sources:RoskillInformationServices2020a,2020b;USGeologicalSurvey(USGS)—variousyears.
“MineralSecurity”PolicyforElectricVehicleBatteryMinerals5
Figures1and2donotseparatebrineandhardrockrefiningcapacities.ROWhas
higherbrinecapacitythanChina,althoughChina’shascontinuedtobuild.However,Chinaoverwhelminglydominatesglobalrefiningcapacityforhardrock–basedlithium.
Figure3comparescapacityutilizationforlithiumrefiningbetweenChinaandROW
over2013–2020.ItshowsthatChina’scapacityutilizationhaslargelyrangedbetween40and60percent,withadownwardtrendfromaround60percentin2013toaround
40percentin2020.ThecapacityutilizationfortheROWhasbeenhigher,hoveringaround80percentformostofthatperiod.
Figure3.CapacityUtilizationforRefinedLithium
100
%CapacityUtilization
90
80
70
60
50
40
30
20
10
ChinaRestofWorld
20132014201520162017201820192020
Sources:RoskillInformationServices2020a,2020b;USGeologicalSurvey(USGS)—variousyears.
Figure4comparesgloballithiumuse,Chineseuse,andChina’sandROW’srefined
lithiumcapacityover2013–2019.Thefiguresuggeststhatfrom2013to2015,total
(ChineseandROW)refiningcapacitygrewinlinewithgloballithiumuse.In2015,
however,thepaceofgrowthinChineserefiningcapacityincreased,leadingtoexcessglobalcapacity.After2017,China’srefiningcapacitysignificantlyexceededglobal
useofrefinedlithium(bygreaterthan150,000tonneslithiumcarbonateequivalent).Thisimpliesaggressivegrowthofprocessingcapacity,fasterthangrowthindemandforrefinedlithium.OnepuzzleiswhyChineserefiningcapacitygrewsomuchwhilecapacityutilizationratesdeclined(Figure3).Figure4alsoshowsapickupinthe
growthofdemandforrefinedlithiumafter2017.
ResourcesfortheFuture6
Figure4.NormalizedGlobalandChineseUseofRefinedLithium
IndexedMetricTonneLithium
CarbonateEquivalentTotal
7
6
5
4
3
2
1
2013201420152016201720182019
ChinacapacityChineseconsumption
RestofWorldcapacityGlobalconsumption
Note:Allfourdatalinesareshowninindexedform.Theindexingwascarriedoutasfollows:
(a)in2013,Chinesecapacitywasindexedto1.0andtheotherthreefigureswerenormalized
relativetothat;and(b)for2014–2020,eachofthefourdatalineswasconstructedbyusingtheratioofcurrenttoprevious-yearvalues.
Sources:RoskillInformationServices2020a,2020b;USGeologicalSurvey(USGS)—variousyears.
Figure5graphsglobalrefinedlithiumproduction(ChineseandROW)andthepriceoflithiumover2013–2020.Thelithiumpricewasstablefrom2013to2015butincreasedsubstantiallybetween2015and2018.Chineseprocessingcapacityandoutputbegantogrowmorerapidlyfrom2015to2017,whichpresumablymoderatedthesubsequentpriceincrease(Figures4–5).However,Chineseprocessingcapacitycontinuedtogrowfrom2017to2020,andactualoutputgrewoverthesameperiodeventhoughtherateofcapacityutilizationwasdeclining(Figure3).Theinevitableresultwasasignificantdeclineinthepriceofrefinedlithiumover2018–2020.5
5Lithiumpricesalsoshotupfrom2021to2022beforefallingbacksomewhatin2023.
SimilartothepatternshowninFigure5,Chineselithiumprocessingcapacitysteadilygrewoverthisentiretime.
“MineralSecurity”PolicyforElectricVehicleBatteryMinerals7
Figure5.RefinedLithiumProductionandPriceofLithium
9
8
Indexedproduction
7
6
5
4
3
2
1
20132014201520162017201820192020RestofWorldproduction
Chineseproduction
25,000
Annualaverageprice
(US$perMetricTonne)
20,000
15,000
10,000
5,000
Priceofbattery-gradelithiumcarbonate
Note:Metrictonnesoflithiumcarbonateequivalentproductionnumbersareindexed,usingthesameapproachoutlinedinFigure4.
Sources:RoskillInformationServices2020a,2020b;USGeologicalSurvey(USGS)—variousyears.
4.2.Cobalt:DataonCapacity,CapacityUtilization,andPrices
Chinaisaninsignificantproducerofcobaltattheminingstage,withanoutputshareofabout1–2percentthroughouttheperiod1999–2022(USGS2000–2023).Incontrast,Figures6and7showthatChina’scapacityforrefiningcobalthasgrownfromamere2.6percentsharein1999toalmost67percentin2021.TheAAGRforcobaltrefining
capacityinChinaforthisperiodhasbeenapproximately24percent,whereasthe
ROW’sAAGRforthesameperiodhasbeenamere1.8percent.ROW’scobaltrefiningcapacityshareintheworldfellfrom97percentto33percent.Similartrendsholdgoodforrefinedcobaltoutputaswell,withChina’sshareinglobalrefinedproductionat
around74percentin2021.
ResourcesfortheFuture8
Figure6.RefinedCobaltCapacityShare
100
90
80
%CapacityShare
70
60
50
40
30
20
10
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
Year
ChinaRestofWorld
Sources:RoskillInformationServices2019;USGeologicalSurvey(USGS)—variousyears.
Figure7.RefinedCobaltCapacity
IndexedMetricTonneCobaltContent
12
10
8
6
4
2
2000
2002
2003
2004
2005
2009
2020
1999
2001
2006
2007
2008
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2021
Year
ChinaRestofWorld
Note:Figure7showsrelativegrowthincapacities,withChineseandRestofWorld(ROW)capacitiesnormalizedto1.0in2004.
Sources:RoskillInformationServices2019;USGeologicalSurvey(USGS)—variousyears.
“MineralSecurity”PolicyforElectricVehicleBatteryMinerals9
Figure8comparescobaltrefiningcapacityutilizationbetweenChinaandROWover1999–2021.Itshowsthatunlikethecaseforlithium,China’scobaltrefiningcapacityutilizationhaslargelyshownanupwardtrend,risingfrom20percentin1999tomeetROWat60percentin2012,andthenconsistentlysurpassingROWinthefollowingyears.Itgrewto100percentin2015beforefallingtoaround60percentin2019.
CapacityutilizationfortheROWhasbeenlargelyflat,intherangeof60percent.
Figure9showsthatChina’scobaltrefiningcapacityhasrisenatanincreasedratesince
2015andslightlysurpassedglobalcobaltusein2019.
Figure8.CapacityUtilizationforCobalt
120
%CapacityShare
100
80
60
40
20
ChinaRestofWorld
199920012003200520072009201120132015201720192021
Sources:RoskillInformationServices2019;USGeologicalSurvey(USGS)—variousyears.
Figure9.NormalizedChineseandGlobalUseofRefinedCobalt
IndexedMetricTonne
4
CobaltContent
3
2
1
2013201420152016201720182019
GlobalConsumptionChinesecapacityRestofWorldCapacity
Note:DataareindexedusingthesameapproachoutlinedinFigure4.
Sources:RoskillInformationServices2019;USGeologicalSurvey(USGS)—variousyears.
ResourcesfortheFuture10
InFigure10,thelineforthepriceofrefinedcobaltshowstwosignificantrunups,from
2002to2008(withsomeretrenchmentin2004–2005)andagainfrom2016to2018.
China’sproductionduringthefirstperiodstartedsmallbutgrewsubstantiallyuntil
2010,eventhoughthepricedroppedsignificantlyin2009.WecannotsaythatChina’scontinuedgrowthinoutputcausedthepricedropgivenotherfactors,suchasthe
globalfinancialcrisisandrecessionatthattime,butitpresumablycontributedtosomeextent.
Figure10.RefinedCobaltProductionandPrice
IndexedMetricTonneCobaltContent
20
18
16
14
12
10
8
6
4
2
100,000
90,000
US$perMetricTonne
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2011
Year
ChineseProductionRestofWorldProductionPriceofcobaltmetal(USspot)
Note:ProductionnumbersareindexedusingthesameapproachoutlinedinFigure4,exceptthenormalizationsarecenteredon2004ratherthan2013.
Sources:RoskillInformationServices2019;USGeologicalSurvey(USGS)—variousyears.
Chineseproductionresumeditsincreasein2012andsurpassedROWproduction,even
thoughthepriceofrefinedcobaltwasstagnantuntil2016.Subsequently,Chinese
outputgrewdramatically,evenafterthepricepeakin2018.Thecontinuedrisein
Chineseoutputpresumablycontributedtothepricedecline.Therateofcapacity
utilizationdeclinedafter2016(Figure8),meaningthattheverylargeoutputincreases
thereaftercanbeattributedtonewcapacitybeingbuilt(Figures6–7).
“MineralSecurity”PolicyforElectricVehicleBatteryMinerals11
Figure11.ChineseSteelProductionandIronOreImports
Note:ImpliedDomesticIronOreProduction(importequivalent):pigironconsumptionimpliedironunitdemandlessimports,plusstockchangesandtransformedtobeequivalentto
importedorecharacteristics(moistureandironcontent)
Source:RioTinto2016.
Figure12.ChineseAluminumProductionandBauxiteand
AluminaImports
Source:RioTinto2014.
ResourcesfortheFuture12
5.WhatDo
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。
最新文档
- 2026年注册岩土工程师执业考试题目及答案
- 2026年数字货币技术研发考试题目及答案
- 2026年医学影像技术中级考试题目及答案
- 2026年ICU镇静镇痛护理知识测评试卷及答案
- 2026年航空空乘专业能力考试题目及答案
- 区块链审计数据中心项目可行性研究报告
- 2026年纸基3D打印材料性能测试方法
- 小型灌区项目可行性研究报告
- 2026-2030中国运动手套行业市场现状供需分析及重点企业投资评估规划分析研究报告
- 2026-2030溜冰专用护具市场发展现状调查及供需格局分析预测研究报告
- 气象行业公共服务技能竞赛理论知识试题及答案
- 夏季四防培训试题及答案
- GB/T 36699-2026锅炉用液体和气体燃料燃烧器技术规范
- 各部门、岗位人员及施工现场总分包安全生产责任制
- 平江2026年事业编招聘考试真题及答案解析
- (2026年)中小学阳光招生专项行动课件
- DL∕T 5847-2021 配电系统电气装置安装工程施工质量检验及评定规程
- BIM土建工程验工计价(建筑工程计量计价)
- LY/T 3315-2022森林立地质量评价技术规程
- CCC认证 3C认证 3C强制
- 患者跌倒的预防及管理课件
评论
0/150
提交评论