一立方体,左右前后各开两个大小相同的槽形通孔,出现了以下错误提示<BR>error:Topological dedeneracy detected for vsbv command. tyr modifying geometry <BR>slightly or loosening the tolerance(btol command), If btol is relaxed, be sure to change the tolerance back to the default after operation .<BR>不知道该怎么解决?