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数据库 服务 : 24 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 4 |
| Data processing | 1 |
| Earth sciences | 1 |
| Electronics | 9 |
| Hydroelectric power stations | 1 |
| Information technology | 4 |
| Project management | 2 |
| Telecommunications | 1 |
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