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双 极子 : 26 phrases in 9 subjects |
| Air defense | 1 |
| Antennas and waveguides | 2 |
| Electronics | 14 |
| General | 1 |
| Mathematics | 1 |
| Oil / petroleum | 2 |
| Plastics | 2 |
| Polymers | 2 |
| Space | 1 |
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