理学 局域网 释 hub 集线器 在计算机网络中配置成星形的中心功能单元。它协调在站之间的数据通信，并可以提供对其他计算机网络的接入。
网络与数据通信 协议体系与组成结构 释文 hub 集线器
- protection
- Protection and Maintenance of Ancient Chinese Architecture
- protection and maintenance project of Zhashilunbu Temple in Tibet
- protection and maintenance system
- protection and management of landscape rockery
- protection and restoration of ancient clock relics
- protection and restoration of concrete
- protection area
- protection area of railway safety
- Protection/control of military stress injury
- protection danger
- protection design of orifice
- protection device for overwinding
- protection equipment
- protection facility of fishing port
- protection forest
- protection for geological heritage
- protection for the power electronic equipment
- protection mapping control
- protection, monitoring and control device for distribution lines
- protection object
- protection of ancient and famous trees in Shaanxi
- protection of animal biosafety
- protection of Chinese materia medica resources
- protection of cultivated land