“预备航天员选拔”的概念、定义、翻译、参考文献-科学参考

单词	预备航天员选拔
释义	预备航天员选拔 Encyclopedia 工学航天员选拔与训练释 astronaut candidate selection预备航天员选拔根据选拔标准，挑选出经过训练有望成为合格航天员的候选航天员的过程。是载人航天工程航天员队伍建设的起点和重要环节，直接影响航天员的训练质量和效率。
随便看	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 positive semi-definite kernel positive semi definite 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。