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| система резервирования | |||
| дублирующая система | |||
| вспомогательная система; запасная система | |||
| back- up system: 19 phrases in 10 subjects |
| Astronautics | 1 |
| Automobiles | 1 |
| Computers | 1 |
| Electronics | 2 |
| General | 4 |
| Military | 2 |
| Oil / petroleum | 2 |
| Sakhalin | 1 |
| Tengiz | 1 |
| Weapons of mass destruction | 4 |