See ranks.
See matrix.
1. The number of linearly independent rows or columns of a matrix of numbers.
2. (of a graph) See connected graph.
The position or status of a taxon in a classification hierarchy. Examples of ranks are the class, order, family, genus, and species.
1. Category of stratigraphic unit or geologic-time unit, classed according to magnitude or duration.
2. The grade or purity of a substance (referring particularly to coal).
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。