[{"title":"( 4 个子文件 14.59MB ) 数字信号处理+丁玉美版","children":[{"title":"第二章习题答案.pdf <span style='color:#111;'> 4.83MB </span>","children":null,"spread":false},{"title":"第三章习题答案.pdf <span style='color:#111;'> 5.30MB </span>","children":null,"spread":false},{"title":"第一章习题答案.pdf <span style='color:#111;'> 2.24MB </span>","children":null,"spread":false},{"title":"第四章习题答案.pdf <span style='color:#111;'> 3.16MB </span>","children":null,"spread":false}],"spread":true}]