数据库 数据库理论 释文 hierarchical data model 层次数据模型
- tangent microbundle
- tangent number
- tangent of a circle
- tangent of an angle
- tangent of dielectric loss angle
- tangentoid
- tangentoidal curve
- tangentor
- tangent osculating circle
- tangent osculating half-space
- tangent parallelogram
- tangent plane
- tangent process
- tangent representation
- tangent r-frame
- tangent r-frame bundle
- tangent rule
- tangent set
- tangent sheaf
- tangents law
- tangent space
- tangent speed
- tangent sphere
- tangent sphere bundle
- tangent-sphere coordinate