| |||
| 方向观测法 | |||
|
directional method : 12 phrases in 7 subjects |
| Earth sciences | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 5 |
| |||
| 方向观测法 | |||
|
directional method : 12 phrases in 7 subjects |
| Earth sciences | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 5 |