[{"title":"( 8 个子文件 101.22MB ) 北理工《信号与系统》习题答案","children":[{"title":"信号与系统习题答案","children":[{"title":"第5章答案.pdf <span style='color:#111;'> 17.37MB </span>","children":null,"spread":false},{"title":"第2章答案.pdf <span style='color:#111;'> 17.15MB </span>","children":null,"spread":false},{"title":"第3章答案.pdf <span style='color:#111;'> 14.97MB </span>","children":null,"spread":false},{"title":"第7章答案.pdf <span style='color:#111;'> 3.74MB </span>","children":null,"spread":false},{"title":"第8章答案.pdf <span style='color:#111;'> 7.96MB </span>","children":null,"spread":false},{"title":"第4章答案.pdf <span style='color:#111;'> 28.32MB </span>","children":null,"spread":false},{"title":"第6章答案.pdf <span style='color:#111;'> 3.35MB </span>","children":null,"spread":false},{"title":"第1章答案.pdf <span style='color:#111;'> 14.14MB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]