 |
| |||
| состав воздуха | |||
| composition of air: 3 phrases in 3 subjects |
| Chemistry | 1 |
| Combustion gas turbines | 1 |
| Natural resourses and wildlife conservation | 1 |
|
| |||
| состав воздуха | |||
| composition of air: 3 phrases in 3 subjects |
| Chemistry | 1 |
| Combustion gas turbines | 1 |
| Natural resourses and wildlife conservation | 1 |