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Tanninsintanninscombinewithactivegroupsofskincollagen,whichleadstonewcross-linkingbetweenadjacentpolype
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1.Chrometanningagent:usedforvariousinorganicsalttanningagents.Thepreferredcomponentistrivalentbasicchro
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Whatisthedifferencebetweenallkindsof"velvet"infabrics?Whichkindoffabricisvelvetorflannel...
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