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数据 处理中心 : 64 phrases in 14 subjects |
Air defense | 1 |
Aviation | 5 |
Business | 2 |
Earth sciences | 16 |
Electronics | 11 |
General | 2 |
Information technology | 1 |
Mathematics | 1 |
Securities | 1 |
Shipbuilding | 3 |
Space | 10 |
Technology | 5 |
Telecommunications | 2 |
United States | 4 |