“sigma ring”的概念、定义、翻译、参考文献-科学参考

单词	sigma ring
释义	sigma ring [`sig·mǝ ´riŋ] ^MATHEMATICS A ring of sets where any countable union of its members is also a member.
随便看	relative coordinates relative coordinate system relative current relative damping ratio relative dating relative deflection relative density relative-density bottle relative dielectric constant relative direction relative distance relative divergence relative efficiency relative error relative erythrocytosis relative force relative frequency relative frequency distribution relative frequency table relative fugacity relative gain Protista protium Protoariciinae protobitumen

科学参考收录了103327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。