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| 光学垂准器 | |||
| 光学对中器; 光学对点器; 光测悬锤; 光测铅垂线 | |||
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| 光学对中器; 光学对点器; 光学垂准器; 光测悬锤; 光测铅垂线 | |||
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optical plummet : 7 phrases in 1 subject |
| Technology | 7 |
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