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| 31. | Spectral Analysis ? |
| 地物波谱学 |
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| 32. | spectrum response curve |
| 波谱响应曲线 |
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| 33. | acceleration response spectrum |
| 加速反应波谱 |
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| 34. | harmonic spectrum of signal |
| 信号谐波谱 |
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| 35. | microwave spectroscopy |
| 微波波谱学 |
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| 36. | maser spectroscopy |
| 微波激射波谱学 |
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| 37. | radio frequency spectroscopy |
| 射频波谱学 |
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| 38. | alog wave spectrum analyzer |
| 模拟波谱分析器 |
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| 39. | spectroscopy in organic chemistry |
| 有机波谱学 |
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| 40. | heterodyne spectroscopy |
| 外差波谱学 |
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