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| D領域; D層 (D・そう) | |||
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couche D : 19 phrases in 9 subjects |
| Antennas and waveguides | 1 |
| Cables and cable production | 1 |
| Electronics | 1 |
| General | 1 |
| Microsoft | 7 |
| Radio | 3 |
| Radiology | 1 |
| Semiconductors | 1 |
| Vacuum tubes | 3 |
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