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| down conversion | |||
| frequency down-conversion | |||
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| 下 变频: 22 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 7 |
| General | 1 |
| Genetics | 2 |
| Multimedia | 1 |
| Space | 6 |
| Technology | 3 |
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