论文部分内容阅读
Educationalresourcesaretheinfrastructureof distanceeducation.Ononehand,mostofeduca tionalresources(suchastext,images,audio,vide o,courseware,…,etc)existintheformoffiles.Thesefileshavethecharacteristicsofbeinghugea mountwhicharefromkilobytestogigabytes,in