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| 重大信息; 关键信息 | |||
| material information: 25 phrases in 12 subjects |
| Aviation | 9 |
| Earth sciences | 1 |
| Electronics | 4 |
| Environment | 1 |
| Finances | 1 |
| General | 1 |
| Librarianship | 1 |
| Securities | 2 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
| United States | 2 |
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