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| 闭塞制度; 闭塞系统; 闭塞法 | |||
| блок -система: 48 phrases in 9 subjects |
| Astronautics | 3 |
| Automated equipment | 2 |
| Aviation | 1 |
| Computer networks | 1 |
| Drilling | 1 |
| Electronics | 3 |
| General | 12 |
| Military | 1 |
| Technology | 24 |
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