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| active surface (of ultrasonic head); effective irradiation surface (of ultrasonic head) | |||
| active area | |||
| active surface | |||
| face of tooth; flank; tooth flank; tooth surface | |||
| wind collector | |||
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surface active : 12 a las frases, 6 temas |
| Ciencias de la tierra | 2 |
| Metalurgia | 6 |
| Química | 1 |
| Recursos naturales y conservación de la vida silvestre. | 1 |
| Tecnología de la información | 1 |
| Transporte | 1 |