[{"title":"(2个子文件979KB)程控数字交换与交换网试题及答案10套","children":[{"title":"程控交换","children":[{"title":"《现代交换原理》练习题.doc <span style='color:#111;'>2.04MB</span>","children":null,"spread":false},{"title":"《现代交换原理》综合练习题参考解答.doc <span style='color:#111;'>3.19MB</span>","children":null,"spread":false}],"spread":true}],"spread":true}]