[{"title":"( 3 个子文件 464KB ) 机械设计大作业(螺旋千斤顶说明书+装配图).","children":[{"title":"机械设计大作业(螺旋千斤顶说明书+装配图","children":[{"title":"说明.txt <span style='color:#111;'> 89B </span>","children":null,"spread":false},{"title":"螺旋千斤顶.dwg <span style='color:#111;'> 93.25KB </span>","children":null,"spread":false},{"title":"螺旋千斤顶说明书.doc <span style='color:#111;'> 2.52MB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]