[{"title":"( 7 个子文件 925KB ) 电工院《信号与系统》(张明友、吕幼新)本....rar","children":[{"title":"电工院《信号与系统》(张明友、吕幼新)本科课件","children":[{"title":"第六章.ppt <span style='color:#111;'> 340.50KB </span>","children":null,"spread":false},{"title":"第三章.ppt <span style='color:#111;'> 521.50KB </span>","children":null,"spread":false},{"title":"第二章.ppt <span style='color:#111;'> 48.50KB </span>","children":null,"spread":false},{"title":"第七章.ppt <span style='color:#111;'> 272.00KB </span>","children":null,"spread":false},{"title":"第五章.ppt <span style='color:#111;'> 176.00KB </span>","children":null,"spread":false},{"title":"第一章.ppt <span style='color:#111;'> 106.00KB </span>","children":null,"spread":false},{"title":"第四章.ppt <span style='color:#111;'> 303.50KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]