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| довзрывоопасная концентрация (The ASTM E1515 Standard Test Method for Explosible Concentration of Combustible Dusts is ... Alexander Demidov) | |||
| взрывоопасная концентрация | |||
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explosible concentration : 4 phrases in 2 subjects |
| General | 1 |
| Security systems | 3 |