[{"title":"( 2 个子文件 716KB ) 减速器基础知识培训及选型计算PPT课件(SEW).rar","children":[{"title":"减速器基础知识培训及选型计算PPT课件(SEW)","children":[{"title":"减速器基础知识培训及选型计算PPT课件(SEW).ppt <span style='color:#111;'> 1.07MB </span>","children":null,"spread":false},{"title":"readme.txt <span style='color:#111;'> 395B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]