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| 31. | symmetrical matrix |
| 对称阵 |
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| 32. | symmetrical astigmatism |
| 对称象散 |
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| 33. | symmetrical attenuator |
| 对称衰减器 |
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| 34. | symmetrical pair |
| 对称线对 |
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| 35. | symmetrical demodulator |
| 对称解调器 |
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| 36. | symmetrical grading |
| 对称分品连接 |
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| 37. | symmetrical dispersion |
| 对称色散 |
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| 38. | symmetrical network |
| 对称网络 |
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| 39. | symmetrical distribution |
| 对称分配 |
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| 40. | symmetrical pass |
| 对称孔型 |
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