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
- linkedness
- linked open data
- linked phrase indexing system
- linked polyhedra
- linked product
- linked queue
- linked stack
- linked storage
- linked string
- linked table
- linked translations
- Lin Kehuan
- link encryption
- linker
- linker-adaptor PCR，LA-PCR
- linker insertion mutation
- link function
- link grammar
- link group
- linking
- Linking Citizen Satisfaction with E-Government and Trust in Government
- linking coefficient
- linking loader
- linking matrix
- linking number