数据库 数据库新技术 释文 inverse document frequency, IDF 反文档频率
- face-on spiral galaxy
- face operator
- Face Paintings of Chinese Operas
- face paintings of Kunqu opera
- face perception
- facepiece
- face plate
- faceplate
- face presentation
- face pumped laser
- face-pumped laser
- face-pumping
- face recognition
- face reconstruction
- face-regular polyhedron
- face ring
- face-ring stray field
- face seal
- face-sheet
- faceshield
- facet
- facet analysis
- faceted classification
- faceted notation
- faceted search