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61. | symmetrical object glass |
| 对称物镜 |
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62. | symmetrical correspondence |
| 对称对应 |
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63. | symmetrical electrometer |
| 对称静电计 |
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64. | symmetrical quadripole |
| 对称四端网络 |
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65. | symmetrical factor |
| 对称因子 |
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66. | symmetrical mirror |
| 对称镜 |
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67. | symmetrical lens |
| 对称透镜 |
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68. | symmetrical profiling |
| 对称剖面法 |
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69. | symmetrical load |
| 对称荷载 |
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70. | symmetrical repetition |
| 对称重复 |
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