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| οπτικό σήμα; φάσμα οπτικών συχνοτήτων | |||
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| οπτική τοποθέτηση | |||
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video : 26 phrases in 6 subjects |
| Communications | 7 |
| Education | 3 |
| General | 2 |
| Health care | 2 |
| Information technology | 6 |
| Microsoft | 6 |
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