 |
| |||
| constant-level balloon; drifting balloon; horizontally floating balloon; no-lift balloon; zero-buoyancy balloon | |||
| дрейфующий шар-зонд: 5 phrases in 2 subjects |
| Makarov | 1 |
| Technology | 4 |
|
| |||
| constant-level balloon; drifting balloon; horizontally floating balloon; no-lift balloon; zero-buoyancy balloon | |||
| дрейфующий шар-зонд: 5 phrases in 2 subjects |
| Makarov | 1 |
| Technology | 4 |