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| 转换波地震勘探 | |||
| 交变波; 交替波 | |||
| alternating wave: 18 phrases in 7 subjects |
| Aviation | 2 |
| Electronics | 5 |
| General | 3 |
| Geophysics | 2 |
| Oil / petroleum | 2 |
| Radio | 2 |
| Technology | 2 |
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