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| фильтрующая обсыпка (дренажа) | |||
| drain fill: 30 phrases in 13 subjects |
| Astronautics | 3 |
| Aviation | 1 |
| Construction | 4 |
| General | 3 |
| Makarov | 1 |
| Metallurgy | 1 |
| Military | 6 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 1 |
| Oil and gas technology | 3 |
| Programming | 1 |
| Road works | 1 |
| Technology | 4 |