单系

The historical development of the concepts of genealogy, phylogeny, monophyly and polyphyly is briefly reviewed.

历史地回顾了谱系、系统发育、系、多系概念的由来和发。

The results indicate that when the plastic strain is smaller than 39 5%,plastic deformation has typicality of uniserial slipping.

连铸铝线材在变量小395％，其塑性变具有明显的系滑移特征，当变量大395％，出现多系滑移特征。