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| operation requirement; operations requirement | |||
| operation requirements | |||
| operational requirements | |||
| operational requirement | |||
| 操作要求: 41 phrases in 8 subjects |
| Aviation | 21 |
| Business | 2 |
| Economy | 2 |
| Electronics | 9 |
| General | 1 |
| Space | 4 |
| Technology | 1 |
| Telecommunications | 1 |
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