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热量由固体壁面传递给流体或者相反的过程称为给热

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物质的热导率均随温度的升高而增大。

在传热实验中用饱和水蒸汽加热空气,总传热系数K接近于空气侧的对流传热系数,而壁温接近于饱和水蒸汽侧流体的温度值。

在列管式换热器中,当热流体为饱和蒸汽时,流体的逆流平均温差和并流平均温差相等。

YouworkasadatabaseadministratorforCertkiller.com.UsersintheCertkillerPRODdatabasecomplainabouttheslowresponsewhenaccessingthedatabase.IntheActiveSessionWaiting:Configurationpageyoufindthatthemajorityofthewaittimeisfortheredologbuffer.FurtherinvestigationusingtheRunQueuegraphandoperatingsystemtoolsrevealsthattheredologfilesareonthesamedisks,andthatthediskI/Ofortheredologfilesisthereasonfortheperformancedegradation.
Whichtwoactionswouldyoutaketogainperformance?()

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