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| high-density recording | |||
| high density recording | |||
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高密度 记录 : 16 phrases in 8 subjects |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Geophysics | 4 |
| Information technology | 1 |
| Space | 4 |
| Technology | 1 |
| Telecommunications | 1 |
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