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反射系数 : 42 phrases in 9 subjects |
| Antennas and waveguides | 1 |
| Electronics | 11 |
| General | 8 |
| Geology | 2 |
| Military | 1 |
| Oil / petroleum | 2 |
| Physics | 3 |
| Radio | 2 |
| Technology | 12 |
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