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| предельно допустимая концентрация в воздухе: 19 phrases in 11 subjects |
| Construction | 1 |
| Ecology | 3 |
| Industrial hygiene | 1 |
| Makarov | 1 |
| Occupational health & safety | 2 |
| Oil and gas | 1 |
| Production | 1 |
| Security systems | 1 |
| Technology | 1 |
| United States | 1 |
| Weapons of mass destruction | 6 |