网络与数据通信 协议体系与组成结构 释文 OSI presentation layer OSI表示层
- permeability of soil
- permeability of soils
- permeability of vacuum
- permeability of wood
- permeable membrane
- permeable rate of rock mass
- permeable reactive barrier
- permeable reactive barrier technology
- permeameter
- permeance
- permease
- permeation
- permeation grouting
- Permenet International Association of Road Congress
- permethrin
- Permian
- permian basin tight oil
- Permian coal-forming plants
- Permian coal measures
- permian period
- Permian-Triassic boundary events
- per mil
- permil
- permillage
- per mille