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| source of ignition (Leona21) | |||
| source of combustion (identify the source of combustion – определить источник возгорания ART Vancouver) | |||
| ignition source (MichaelBurov) | |||
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| causes of combustion (sankozh) | |||
| источник возгорания: 7 phrases in 4 subjects |
| Aviation | 1 |
| Occupational health & safety | 2 |
| Oil and gas | 3 |
| Quality control and standards | 1 |