[{"title":"( 2 个子文件 291KB ) 带式运输机上用的蜗杆减速器","children":[{"title":"一级蜗杆减速器的设计说明.doc <span style='color:#111;'> 471.00KB </span>","children":null,"spread":false},{"title":"一级涡轮蜗杆减速器装配图.dwg <span style='color:#111;'> 229.41KB </span>","children":null,"spread":false}],"spread":true}]