| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 Unfortunately, its simplicity is also its weakness since it is frequently too simple to represent realistic problems. 
![]()  | 
|
| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 
 
 
  | 
|
| 
 Unfortunately, its simplicity is also its weakness since it is frequently too simple to represent realistic problems. 
![]()  | 
|







发表于 2007-8-20 21:16
 | 







