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| pre amplifier | |||
| biochemical precursor | |||
| front end (e.g. RF receiver) | |||
| prestage | |||
| precursor | |||
| first stage | |||
| input stage; preliminary stage; low-level stage | |||
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Vorstufe : 21 a las frases, 9 temas |
| Ciencias de la tierra | 1 |
| Cuidado de la salud | 1 |
| Economía | 1 |
| Electrónica | 1 |
| General | 11 |
| Impuestos | 1 |
| Medicina | 3 |
| Química | 1 |
| Transporte | 1 |