packet switching是什么?

packet switching是什么? Virtual Circuit Packet Switching 的工作原理是什么 请问一下packet switching的具体过程 英语句子在线翻译Circuit Switching and Packet Switching In message switching,the transmission unit Why is packet switching used in computer networks? SWITCHING POWER SUPPLY是什么? Switching Regulator是什么 switching switching switching packet tracer 5.2是什么? packet的复数是什么 tea packet display box 和 tea packet 的区别是什么? paper-foil-plastic laminate packet是什么 短脉冲激光,Gain-switching Q-switching mode-locking这些名称的中文翻译分别是什么.有相关的介绍更好. We need a packet of tea的问句是什么? 英语翻译The basic technologies underling the communication network will be reviewed first,and then the progress of the telecommunication technologies will be examined in terms of transmission,switching,signaling,packet communication,ISDN,and B-IS in packet