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| 控制观测 | |||
| 检差观测 | |||
| control observation: 13 phrases in 7 subjects |
| Earth sciences | 1 |
| Electronics | 4 |
| Information technology | 1 |
| Space | 3 |
| Technology | 2 |
| Telecommunications | 1 |
| United States | 1 |
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