“null”的概念、定义、翻译、参考文献-科学参考

单词	null
释义	null Physics null①零，零的 ②无效的，无价值的 ③类光[的]^† Mathematics null零的；零 Computer 数据库数据库管理系统及其实现技术释文 null空值
随便看	group of collineations group of comets group of conformal transformations group of congruence classes group of congruence transformations group of covering transformations group of curves group of cycles group of death group of diffeomorphisms Group of Eight Group of Experts on the Scientific Aspects of Marine Pollution group of figures group of finite order group of finite rank group of finite type group of galaxies group of holonomy group of homeomorphisms group of homotopy group of ideals group of infinite order group of inner automorphisms group of inner permutations group of integers

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。