 |
| |||
| 安全标志 | |||
| 安全信号 | |||
| safety signal: 6 phrases in 5 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mechanics | 1 |
| Nuclear and fusion power | 1 |
| Space | 1 |
| Technology | 2 |
|
| |||
| 安全标志 | |||
| 安全信号 | |||
| safety signal: 6 phrases in 5 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mechanics | 1 |
| Nuclear and fusion power | 1 |
| Space | 1 |
| Technology | 2 |