主题词
4.The Research of Retrieval Results Affected by Subheadings to Headings in MEDLINE CD-ROM
5.The Key Word Description of Automatic Attaining Page by Hypertext Link Analysis
8.A set of subject terms that indicates the subject interests of an information system user.
9.The access points of the western language books mainly include: ISBN,responsible authors,titles,subject headings,class number, etc.
10.In CWIS system, logical operator POR which has priority to logical operator AND can simplify the process of the logical expression and is easy to use.
