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31. | low frequency beacon |
| 低频信标 |
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32. | low frequency motion |
| 低频运动 |
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33. | low frequency transfer |
| 低频转移 |
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34. | low frequency recovery |
| 低频复原 |
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35. | low frequency vibration |
| 低频振动 |
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36. | audio frequency output |
| 低频输出 |
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37. | low frequency wave |
| 低频波 |
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38. | low frequency compensator |
| 低频补偿器 |
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39. | VLF (Very Low Frequency) |
| 超低频 |
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40. | low frequency transistor |
| 低频晶体管 |
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