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| 21. | symmetrical dispersion |
| 对称色散 |
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| 22. | symmetrical repetition |
| 对称重复 |
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| 23. | symmetrical transistor |
| 对称晶体管 |
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| 24. | symmetrical matrix |
| 对称阵 |
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| 25. | symmetrical wave |
| 对称波 |
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| 26. | symmetrical demodulator |
| 对称解调器 |
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| 27. | symmetrical astigmatism |
| 对称象散 |
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| 28. | symmetrical distribution |
| 对称分配 |
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| 29. | symmetrical attenuator |
| 对称衰减器 |
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| 30. | symmetrical pass |
| 对称孔型 |
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