我将不同的有限元模型合并后，运用命令
nummrg,all
numcmp,all

进行两个模型同一坐标系点的合并，为什么不起效果，我的合并命令流为：

FINISH                                                    
/CLEAR                                                    
/PREP7                                                    
/INPUT,'A1','TXT','C:\Users\Administrator\Desktop\',, 0   
CDWRITE,ALL,'A1','cdb',,'A1','iges'                       
                                                          
FINISH                                                    
/CLEAR                                                    
/PREP7                                                    
/INPUT,'A2','TXT','C:\Users\Administrator\Desktop\',, 0   
CDWRITE,ALL,'A2','cdb',,'A2','iges'                       
                                                          
!!合并模型!!!                                             
FINISH                                                    
/CLEAR                                                    
/PREP7                                                    
                                                          
CDREAD,ALL,'A1','cdb',,'A1','iges'                        
CDREAD,ALL,'A2','cdb',,'A2','iges'                        
                                                          
 nummrg,all                                               
 numcmp,all