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| operational research; operations research | |||
| operation research; study of business | |||
| business studies | |||
| operational research (O. R.) | |||
| 业务 研 究: 14 phrases in 10 subjects |
| Animal husbandry | 2 |
| Earth sciences | 1 |
| Economy | 1 |
| Electronics | 1 |
| Librarianship | 1 |
| Management | 1 |
| Name of organization | 3 |
| Space | 2 |
| Technology | 1 |
| Telecommunications | 1 |
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