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| hierarchy of memory | |||
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存储体系 : 39 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Electronics | 22 |
| Information technology | 6 |
| Metallurgy | 1 |
| Multimedia | 1 |
| Space | 1 |
| Technology | 4 |
| Telecommunications | 1 |
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