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| amplificación simétrica; montaje en contrafase; montaje en oposición de fase; push-pull m | |||
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push- pull : 14 phrases in 8 subjects |
| Earth sciences | 1 |
| Electronics | 5 |
| Information technology | 3 |
| Mechanic engineering | 1 |
| Metallurgy | 1 |
| Natural sciences | 1 |
| Transport | 1 |
| Vacuum tubes | 1 |