| |||
| 低频波 | |||
|
low-frequency wave : 10 phrases in 8 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 2 |
| |||
| 低频波 | |||
|
low-frequency wave : 10 phrases in 8 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 2 |