 |
| |||
| land navigation equipment | |||
| ground navigation aids | |||
| ground-based navigation aids; ground-based navigational aids | |||
| 地面导航 设备: 3 phrases in 3 subjects |
| Aviation | 1 |
| Earth sciences | 1 |
| Shipbuilding | 1 |
|
| |||
| land navigation equipment | |||
| ground navigation aids | |||
| ground-based navigation aids; ground-based navigational aids | |||
| 地面导航 设备: 3 phrases in 3 subjects |
| Aviation | 1 |
| Earth sciences | 1 |
| Shipbuilding | 1 |