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| 51. | photographic unit |
| 摄影部件 |
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| 52. | electrooptic block |
| 电光部件 |
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| 53. | element of construction |
| 建筑部件 |
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| 54. | buoyancy member |
| 浮力部件 |
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| 55. | component test facility |
| 部件试验装置 |
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| 56. | prototyping component |
| 样机部件 |
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| 57. | components for oscilloscopes |
| 示波器部件 |
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| 58. | processor element |
| 处理机部件 |
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| 59. | computer component |
| 计算机部件 |
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| 60. | constituent elements |
| 组成部件 |
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