网络与数据通信 协议体系与组成结构 释文 public packet switched network 公用分组交换网
- paddy field harrow
- paddy fields
- paddy field weeds
- paddy rice processing
- Paddy soil
- paddy soil microbes
- paddy-upland rotation
- paddy water saving irrigation
- Pade
- Pade approximant
- Pade approximants
- PA degree
- PA-degree
- Padeitharaza
- PADF
- pad fluid
- p-adic absolute value
- p-adic algebra
- p-adically closed field
- p-adically equivalent
- p-adic analysis
- p-adic cohomology
- p-adic completion
- p-adic convergence
- p-adic differential equation