“Yang Qidan”的概念、定义、翻译、参考文献-科学参考

单词	Yang Qidan
释义	Yang Qidan Encyclopedia 艺术学〔中国美术家〕释 Yang Qidan杨契丹中国隋代画家。生卒年不详。
随便看	positive psychology positive psychotherapy positive punishment positive quadratic differential positive quadratic form positive quantity positive ray function positive real axis positive real control positive real function positive real number positive real part positive real system positive recurrent point positive recurrent state positive reinforcement positive relation positive result positive root positive root system positive rotation positive school of criminology positive selection positive self-adjoint operator positive self-regard

科学参考收录了854744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。