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| 相位跟踪 | |||
| phase tracking: 25 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 6 |
| Geophysics | 1 |
| Missiles | 1 |
| Space | 9 |
| Technology | 2 |
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