“育种金字塔”的概念、定义、翻译、参考文献-科学参考

单词	育种金字塔
释义	育种金字塔 Encyclopedia 农学动物育种释 breeding pyramid育种金字塔由育种群、扩繁群、生产群构成的具有金字塔特点的育种和生产群体结构。
随便看	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 positive semi-definite positive semi-definite form positive semi definite Hermitian matrix positive semi-definite Hermitian matrix

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。