[{"title":"( 5 个子文件 17.48MB ) 现代交换技术","children":[{"title":"现代交换技术课件","children":[{"title":"第一章 现代交换技术概论.ppt <span style='color:#111;'> 9.06MB </span>","children":null,"spread":false},{"title":"交换练习课.ppt <span style='color:#111;'> 176.50KB </span>","children":null,"spread":false},{"title":"第二章 交换单元与交换网络.pptx <span style='color:#111;'> 1.69MB </span>","children":null,"spread":false},{"title":"第三章 电路交换技术及接口电路.ppt <span style='color:#111;'> 8.82MB </span>","children":null,"spread":false},{"title":"第四章 呼叫处理过程.pptx <span style='color:#111;'> 1.11MB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]