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| demi-période d'activité; demi-période d'efficacité; demi-vie; moitié de la vie moyenne; période; période de demi-valeur; période de demi-vie | |||
| demi-vie physique | |||
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semiperiodo : 6 phrases in 3 subjects |
| Chemistry | 2 |
| Earth sciences | 2 |
| General | 2 |
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