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
- nifedipine; adalat; nifedin; pidilat; nifelat
- nifelat
- nifesphere
- NIFS
- Nigantha Nataputta
- NIGCOMSAT-1R
- Nigel Cross
- Nigensha Co, Ltd
- Niger
- Niger-Congo group
- Niger Delta
- Niger expelled the head of a French military advisory mission
- Niger-France Corporation Agreement
- Nigeria
- Nigeria National Film Institute
- Nigerian General Strike of 1945
- Nigerian Literature
- Nigerian National Museum
- Nigerian People's Party
- Nigerians
- Nigerian Youth Movement
- Nigerien Party for Democracy and Socialism
- Nigerien Progressive Party
- Nigeriens
- Niger-Kordofanian