理学 链路层协议 释 medium access control 介质访问控制 规定数据帧如何在介质上传输，用于协调各节点之间的发送关系，以解决局域网共享信道的竞争问题。
网络与数据通信 有线网络 释文 medium access control, MAC 介质访问控制
- undercompounding
- underconsolidated soil
- undercooled
- undercooled liquid
- undercooled melt /supercooled melt
- undercorrected lens
- undercorrection
- undercoupling
- undercover investigation
- undercritical
- undercrossing
- undercrossing-point
- under cure
- undercurrent
- undercurrent safety culture
- undercut
- undercutting
- undercutting level
- underdamp
- underdamped
- underdamped harmonic motion
- underdamped motion
- underdamping
- underdamping response
- underdegree