- ThetribologicalpropertiesofthepreparedUFDsulfonicacidderivantinthewater-basesolutionwereevaluatedbyusingafour-ballfrictionweartestingmachine.Theorderedlistthatuniquelyidentifiesaspecificdiskfile.ItisthesequenceofdirectoriesfromtheUFD(userfiledirector...
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