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31. | harmonic spectrum of signal |
| 信号谐波谱 |
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32. | microwave spectroscopy |
| 微波波谱学 |
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33. | radio frequency spectroscopy |
| 射频波谱学 |
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34. | electromagnetic spectral band |
| 电磁波谱段 |
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35. | spectroscopy in organic chemistry |
| 有机波谱学 |
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36. | alog wave spectrum analyzer |
| 模拟波谱分析器 |
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37. | maser spectroscopy |
| 微波激射波谱学 |
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38. | heterodyne spectroscopy |
| 外差波谱学 |
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39. | Spectral Analysis ? |
| 地物波谱学 |
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40. | electron paramagnetic resonance spectroscopy; EPR spectroscopy |
| 电子顺磁共振波谱法 |
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