| Characteristic Description of Coupled Task Sets Based on Design Structure Matrix and Its Optimal Time and Efforts Solution by Ge Recent countries visiting this post |  |
 | 6 | United States |
 | 1 | Russian Federation |
| Characteristic Description of Coupled Task Sets Based on Design Structure Matrix and Its Optimal Time and Efforts Solution by Ge Recent countries visiting this post | |
| 6 | United States |
| 1 | Russian Federation |