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pollution naturelle de fond | |||
charge de base naturelle | |||
niveau du fond de rayonnement | |||
niveau de fond | |||
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pollution naturelle de fond |
background level : 14 phrases in 7 subjects |
Automated equipment | 1 |
Chemistry | 1 |
Earth sciences | 4 |
Electronics | 1 |
Environment | 1 |
General | 2 |
Nuclear physics | 4 |