自己写的，可提取cad模型空间块表，达到清理cad数据库的目的，清理掉不能用puege命令清理的记录。适用cad2014，命令oo(CAD model space block table can be extracted to achieve the purpose of cleaning up the CAD database, cleaning up the records that can not be cleaned with the puege command. Apply cad20