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81. | symmetry circuit |
| 对称电路 |
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82. | symmetrical object glass |
| 对称物镜 |
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83. | symmetrical profiling |
| 对称剖面法 |
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84. | symmetry potentia |
| 对称势 |
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85. | symmetrical quadripole |
| 对称四端网络 |
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86. | symmetrical wave |
| 对称波 |
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87. | symmetrical repetition |
| 对称重复 |
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88. | symmetry classes |
| 对称类 |
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89. | symmetrical transistor |
| 对称晶体管 |
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90. | circle of symmetry |
| 对称圆 |
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