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| beat frequency receiver; beat receiver | |||
| heterodyne receiver | |||
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外差式接收机 : 17 phrases in 8 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Earth sciences | 1 |
| General | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 3 |
| Technology | 6 |
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