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ray refraction : 13 phrases in 8 subjects |
| Antennas and waveguides | 2 |
| Construction | 1 |
| Geophysics | 1 |
| Household appliances | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Seismology | 5 |
| Technology | 1 |
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