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| 数据检索系统 | |||
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Data Retrieval System : 41 phrases in 13 subjects |
| Aviation | 8 |
| Business | 3 |
| Earth sciences | 4 |
| Electronic commerce | 1 |
| Electronics | 11 |
| Engineering geology | 1 |
| Finances | 1 |
| Mathematics | 2 |
| Name of organization | 1 |
| Space | 3 |
| Technology | 4 |
| Telecommunications | 1 |
| United States | 1 |