IntroductionAlsoknownaslinearexpansioncoefficient.Whenthetemperatureofasolidsubstanceincreasesby1°C,theelongationperunitlengthiscalledthe"linearexpansioncoefficient".Theunitis1/℃or1/K.Thesymbolisαl.Th...

ThecompositionofthemobileharddiskThemobileharddiskismainlycomposedoftheshell,thecircuitboard(includingthecontrolchipandthedataandpowerinterface)andtheharddisk.Theshellisgenerallymadeofaluminumalloyorp...

>In1801,ItalianastronomerGiuseppePiazzidiscoveredthefirstasteroidCeres.After40daysoftracking,PiazzilostthepositionofCeresbecauseCeresmovedtothebackofthesun.ThenscientistsallovertheworldusedPiazzi'sobs...

ThelifeofthecharacterEarlyexperienceYuanZhenportrait(3photos)InFebruaryoffouryears(779),hewasborninthesoutherncityofLuoyang,theeasterncapital,withhisfatherYuankuanandmotherZheng,descendantsoftheTuobat...

NewdiscoveriesintheworldofparticlesTherevolutioninphysicsattheendofthe19thcenturyandthebeginningofthe20thcenturybrokeinfromtheatomic"entity",andwithitthesecretsofthestructureofmatterwererevealedlayerb...

Interpretationreferstoeavesdropping.Source1."HistoricalRecords·BiographyofFanjuandCaiZe":"However,therearemanyeavesdroppersontheleftandright,FanJuisafraidofnotdaringtospeakinside,butfirsttotalkaboutfo...

IntroductionoverviewWhatisadomainnameRegistrationofdomainnamesfollowstheprincipleofapplyingfirst,registeringfirst,andmanageswhetherthedomainnameproposedbythecertificationauthorityagainsttheapplicantvi...

DefinitionComputervisionisasimulationofbiologicalvisionusingcomputersandrelatedequipment.Itsmaintaskistoobtainthree-dimensionalinformationofthecorrespondingscenebyprocessingthecollectedpicturesorvideo...

BasicintroductionSimplyput,theman-madeearthsatelliteissentintospacebyagiantmulti-stagerocketwithhugepropulsionpower.Theworkingprincipleofmulti-stagerocketsisnotcomplicated.Itistoconnectseveralsingle-l...

BasicinformationHistoricalevolutionAfterthefoundingofNewChina,inordertomeettheneedsoflarge-scalesocialistconstruction,in1952,thecentralgovernmentInaccordancewiththepolicyof"focusingontrainingindustria...

BasicinformationCause1.PurulentmeningitisMeningealinflammationcausedbyvariouspyogenicbacteriaisalargecategoryofbacterialmeningitis.Itisoneoftheseriousintracranialinfections,oftenaccompaniedbypurulente...

SynonymparticlebombardmentgenerallyreferstothegenegunmethodDefinitionIn1987,VleinfirstreportedtheapplicationofthistechnologytoadsorbTMV(tobaccomosaicvirus)RNAtothesurfaceoftungstenparticlesandbombardt...

IntroductiontoNerveCellsAlthoughneuronshavevariousshapesandfunctions,theycanberoughlydividedintotwoparts:somaandneuriteinstructure.Therearetwotypesofprotrusions:dendriteandaxon.Axonsareoftenverylong,s...

DevelopmentstatusIn2010,Chinahad2,723regularcollegesanduniversitiesandadultcolleges;therewereatotalof797postgraduatetrainingunits,including481collegesanduniversitiesand316scientificresearchinstitution...

Interpretation2,verbs.Divideabunchofpeopleorthingsintogroupsofpeopleorthings.IntroductionThistermisusuallyusedtogenerallyrefertoanytypeofmessage.Ininformationtechnology,packetistheformatteddatablocktr...

IntroductionSeawaterisafluidcomposedofcountlessseawaterparticles.Undertheactionofexternalforce,theseawaterparticlesmoveperiodicallyneartheequilibriumpoint,whichformswaves.Wavesareanotherthrillinglarge...