| |||
| 距离搜索 | |||
|
range search : 26 phrases in 7 subjects |
| Air defense | 5 |
| Aviation | 10 |
| Earth sciences | 2 |
| Electronics | 2 |
| Space | 5 |
| Technology | 1 |
| Telecommunications | 1 |
| |||
| 距离搜索 | |||
|
range search : 26 phrases in 7 subjects |
| Air defense | 5 |
| Aviation | 10 |
| Earth sciences | 2 |
| Electronics | 2 |
| Space | 5 |
| Technology | 1 |
| Telecommunications | 1 |