Fundamentals of Forest Products Chemical Processing知到智慧树期末考试答案题库2024年秋东北林业大学

FundamentalsofForestProductsChemicalProcessing知到智慧树期末考试答案题库2024年秋东北林业大学Dependingonthenatureofcellulosicmaterials,celluloseaerogelsincludecellulosederivative-basedones,regeneratedcellulose-basedones,andnanocellulose-basedones.

A:对B:错

答案:对Whentwoobjectsatdifferenttemperaturesarebroughtintothermalcontact,heatflowsfromtheobjectatthehighertemperaturetothatatthelowertemperature.

A:错B:对

答案:对Thebasicflavonoidstructureistheflavannucleus,whichconsistsof15carbonatomsarrangedinthreerings(C6-C3-C6).

A:错B:对

答案:对HydrothermalwasfirstusedbytheBritishgeologistSirRoderickMurchison(1792-1871)todescribetheactionofwateratelevatedtemperatureandpressure,inbringingaboutchangesintheearth’scrustleadingtotheformationofvariousrocksandminerals.

A:错B:对

答案:对Momentumtransfertakesplacebetweenthefluidelementswhicharemoving

atdifferentvelocities.

A:错B:对

答案:对Biochemicalpretreatmentismainlyusedtoovercomerecalcitrantmaterialandincreasesurfaceareatooptimizecelluloseaccessibilitytocellulases.

A:错B:对

答案:对Thedegreeofassociationbetweenligninmoleculesdecreasedwithdecreasingionizationofthecarboxylicgroupinthelignin.

A:错B:对

答案:错ThemostcommoncellulasegroupsproducedbyT.reeseithatcleavetheβ-1,4-glycosidicbondsareβ-glucosidase,endoglucanasesandexoglucanases.

A:对B:错

答案:对Thebleachingstepisnecessaryinthepulpingandpapermakingprocess.

A:错B:对

答案:错Pretreatmentwithdiluteacidhaslittleeffectonlignin.

A:对B:错

答案:错Whenheatingaliquidinatest-tube,weneedpointthetest-tubeawayfromotherpeople.

A:错B:对

答案:对ThelignincontentwasestimatedbythegravimetricKlasonprocedure.

A:对B:错

答案:对Intheprocessofliquid-liquidextraction,theliquid-mixturefeedandsolventaremiscible.

A:对B:错

答案:错Filtrationisaprocessusedtoseparatesolidsfromliquidsusingafiltermediumthatallowsthefluidtopassthroughbutnotthesolid.

A:对B:错

答案:对Polyphenolsaregenerallywater-insolublecompounds.

A:对B:错

答案:错Typicallyphotosynthesisconverts10%oftheavailablesunlighttostored,chemicalenergy.

A:对B:错

答案:错Aprimaryalcoholcanbeoxidizedtoanaldehyde,anditcan'tfurtheroxidationyieldsacarboxylicacid.

A:错B:对

答案:错Theradicalpolymerizationofvinylicmonomersontoligninhasbeenusedtopreparelignin-graftcopolymersbya‘‘graftingfrom”procedure.

A:对B:错

答案:对Therearethreecommonstatesofmatter:gaseous,liquid,andsolid.

A:错B:对

答案:对O2isacompound.

A:错B:对

答案:错Modificationsonhydroxylgroupscanleadtotheformationofpolyolderivativesoflignin.

A:错B:对

答案:对Heartwoodisoftendarkerthanthesapwood.

A:对B:错

答案:对Inwood,thenaturalstateofcellulose,calledcelluloseII.

A:对B:错

答案:错Gelationisnotanessentialstep.

A:对B:错

答案:BInsomecases,momentum,heat,andmasstransferalloccursimultaneously.

A:错B:对

答案:对Oncethepastereachesthedesiredconsistency,it’sovertoacomputerizedsystemthatregulatesthetemperatureofthepasteasanaugermixesit.

A:对B:错

答案:A:对Adecompositionreactionisonewhereacompoundbreaksdownintosmallerandlesscomplexelementsorcompounds.

A:对B:错

答案:AFurfuralisexclusivelyproducedfromlignocellulosicbiomassbydehydratingpentose.

A:对B:错

答案:对Themechanismsbywhichtheheatmayflowarethree:conduction,convection,andradiation.

A:错B:对

答案:对Theseparationofthecomponentsofaliquidmixturebytreatmentwithasolventinwhichoneormoreofthedesiredcomponentsispreferentiallysolubleisknownasliquid-liquidextraction.

A:错B:对

答案:对It'snoteworthythatabout30percentofallfurfuralproducedisconvertedtofurfuralalcohol.

A:错B:对

答案:错Inreactionwithlime,thecolorofthejuicedoesnotchange.

A:错B:对

答案:BThecharcoalbriquettewasinventedin1993.

A:错B:对

答案:错Depolymerizingligninusingpyrolysisdidnotrequirethesolventforthereaction.

A:错B:对

答案:对Generally,therearegenerallytwomainapproachesforlignindepolymerization:pyrolysis,oxidationandhydrotreating.

A:对B:错

答案:A:对Ioniccompoundsareconnectedbyionicbonding.

A:错B:对

答案:对thewoodcellconsistsmainlyofcellulose,hemicelluloses,andlignin.

A:错B:对

答案:AHardwoodisalwaysharderthansoftwood.

A:对B