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
- Newfoundland Act
- Newfoundland and Labrador Province
- New Found Works of Five Dynasties, Song and Yuan Ci Poets
- New Fourth Army Headquarters
- New Fourth Army Military Site Museum
- New Freedom
- New Frontier
- new fuel and new energy aero-engines
- new gaseous insulating material
- New General Catalogue of Nebulae and Clusters of Stars
- New Genre Public Art
- new geopolitics
- New Georgia Islands
- New German Cinema
- new German school
- New Gesaku School
- new growth drivers
- New Grub Street
- New Guanjiao Railway Tunnel
- New Guinea
- New Guinea Act
- New Guinea Campaign
- New Guinea coastal undercurrent
- New Haiku
- New Hampshire State