| |||
| 继电器式计数器 | |||
|
relay counter : 5 phrases in 4 subjects |
| Electricity | 1 |
| Hydroelectric power stations | 1 |
| Mechanic engineering | 1 |
| Technology | 2 |
| |||
| 继电器式计数器 | |||
|
relay counter : 5 phrases in 4 subjects |
| Electricity | 1 |
| Hydroelectric power stations | 1 |
| Mechanic engineering | 1 |
| Technology | 2 |