| |||
| 封闭回路 | |||
|
enclosed circuit : 4 phrases in 4 subjects |
| Electric machinery | 1 |
| Information technology | 1 |
| Skydiving | 1 |
| Technology | 1 |
| |||
| 封闭回路 | |||
|
enclosed circuit : 4 phrases in 4 subjects |
| Electric machinery | 1 |
| Information technology | 1 |
| Skydiving | 1 |
| Technology | 1 |