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| 中心文件 | |||
| 中央文件 | |||
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| 中央档案 | |||
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central file : 10 phrases in 7 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Information technology | 2 |
| Marketing | 1 |
| Military | 1 |
| Space | 3 |
| Technology | 1 |
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