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81. | crystal calibrator |
| 晶体校准器 |
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82. | directional crystal |
| 定向结晶|柱状晶体 |
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83. | anhedral crystal |
| 他形晶 |
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84. | crystal controlled |
| 晶体控制 |
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85. | cleavage crystal |
| 解理晶体 |
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86. | crystal amplifier |
| 晶体放大器;晶体管放大器 |
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87. | crystal accumulation |
| 晶体聚集 |
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88. | crystal control |
| 晶体控制石英稳定 |
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89. | crystal acoustics |
| 晶体声学 |
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90. | crystal counter |
| 晶体计数管 |
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