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| 81. | absolute symmetrical balance |
| 绝对对称平衡 |
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| 82. | doubly symmetrical section |
| 双对称断面 |
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| 83. | symmetrical intensity distribution |
| 对称光强分布 |
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| 84. | rapid symmetrical lens |
| 快速对称透镜 |
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| 85. | symmetrical polyphase circuit |
| 对称多相电路 |
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| 86. | matched symmetrical transistor |
| 匹配对称电晶体 |
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| 87. | symmetrical polyphase source |
| 对称多相电源 |
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| 88. | axially symmetrical radiator |
| 轴向对称辐射器 |
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| 89. | obliquely symmetrical load |
| 斜对称载荷 |
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| 90. | symmetrical frequency weighting |
| 对称频率加权 |
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