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| 71. | symmetry circuit |
| 对称电路 |
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| 72. | symmetrical object glass |
| 对称物镜 |
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| 73. | symmetrical profiling |
| 对称剖面法 |
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| 74. | symmetry potentia |
| 对称势 |
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| 75. | symmetrical quadripole |
| 对称四端网络 |
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| 76. | symmetrical wave |
| 对称波 |
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| 77. | symmetrical repetition |
| 对称重复 |
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| 78. | symmetry classes |
| 对称类 |
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| 79. | symmetrical transistor |
| 对称晶体管 |
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| 80. | circle of symmetry |
| 对称圆 |
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