题 名作者期号页码 专 文依靠科技进步促进通信发展为振兴山东通信事业作出贡献……………胡立成山东通信学会第四次代表大会暨学术交流会在济召开……………………刘德林用准同步传输系统实现数字网主从同步问题的讨论………………………凌公望 (续上期)……………………凌公 Title author period issue page number page relying on scientific and technological progress to promote the development of communications to promote the cause of Shandong communications ............... Hu Lisheng Shandong Institute of Communications Fourth Congress and academic exchange held in the economy ........................ Liu Delin The use of quasi-synchronous transmission system to achieve digital master-slave synchronization discussion ........................... Ling Gong Wang (Continued) ........................ Ling Gong