null ①零，零的 ②无效的，无价值的 ③类光[的]†
null 零的；零
数据库 数据库管理系统及其实现技术 释文 null 空值
- aerotriangulation
- aerotron
- aerotropism
- aeroturbine
- aerovane
- aerovelox
- Aershan Volcanic hot springs national geological park
- aerugo
- AES
- Aeschines
- Aeschylus
- aeschynite
- Ae star
- aesthetic attitude
- aesthetic cosmetics
- aesthetic criticism
- aesthetic curriculum in early childhood education
- Aesthetic Education
- aesthetic education
- aesthetic educational psychology
- Aesthetic Education Psychology
- Aesthetic education thought
- aesthetic exhibition
- aesthetic experience
- aesthetic function of literature