网络与数据通信 网络管理与安全 释文 security parameter index, SPI 安全参数索引
- natural measure
- natural medicine
- natural medium
- natural metric
- natural mini-reserve of wetland
- natural model
- natural modification
- natural monopoly
- natural monopoly industry
- natural morphism
- natural moving frame
- natural necessity
- natural norm
- Natural novel
- natural nuclear reactor
- natural nucleotide
- natural nuclide
- natural number
- natural number of a logarithm
- natural number sequence
- natural numbers object
- natural object
- natural object, natural scene
- natural object photography
- natural operation