 |
| |||
| null type | |||
| 空类型: 21 phrases in 7 subjects |
| Aviation | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Metallurgy | 2 |
| Refrigeration | 1 |
| Remote sensing | 1 |
| Space | 2 |
| Technology | 12 |
|
| |||
| null type | |||
| 空类型: 21 phrases in 7 subjects |
| Aviation | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Metallurgy | 2 |
| Refrigeration | 1 |
| Remote sensing | 1 |
| Space | 2 |
| Technology | 12 |