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κεντρικό ελατήριο | |||
σπιράλ | |||
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καμπύλα πτερύγια |
spiraal : 28 phrases in 11 subjects |
Agriculture | 1 |
Chemistry | 4 |
Coal | 1 |
Construction | 3 |
Earth sciences | 2 |
Electronics | 4 |
Materials science | 2 |
Mechanic engineering | 2 |
Medical | 6 |
Technology | 1 |
Transport | 2 |