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81. | Alexanderson altimeter |
| 反射测高计;反射高度计 |
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82. | continuous wave NMR spectrometer |
| 连续波核磁共振波谱仪 |
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83. | radio and microwave spectroscopy |
| 射频和微波波谱学 |
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84. | regular reflection |
| 单向反射|规则反射 |
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85. | X-band EPR spectrometer |
| X频带电子顺磁共振波谱仪 |
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86. | abolition of reflex |
| 反射消失;无反射 |
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87. | two-coil nuclear magnetic resonance spectrometer |
| 双线圈核磁共振波谱仪 |
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88. | alternating reflex |
| 更迭反射;交替反射 |
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89. | concentrated reflection |
| 集中反射|浓缩反射 |
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90. | irregular reference |
| 乱反射|不规则反射 |
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