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| information storage and retrieval | |||
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信息存储 与 检索 : 25 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Earth sciences | 4 |
| Electronics | 11 |
| Geology | 1 |
| Information technology | 3 |
| Space | 2 |
| Technology | 2 |
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