数据通信中,LAPB的帧可分为三大类,即信息帧、()和无编号帧。
监控帧
暂无解析
Thereisno( )betweenthenations.
ThissignsinAmericarepresents:
Inasecond-handbookshop,Billycameacrossabookwhichhethoughtwascertainlya____edition.
Wedesiretoestablish_____beneficialbusinessrelations.
Workthroughlunch