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| geometrical optic approximation; ray approximation | |||
| ray-path description | |||
| geometrical optics approximation; ray-theory concept | |||
| лучевое приближение: 11 phrases in 5 subjects |
| Antennas and waveguides | 1 |
| Chemistry | 1 |
| Electronics | 6 |
| Geophysics | 2 |
| Navigation | 1 |
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