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| 光学测量仪 | |||
| 光测垂准器; 光学垂准器; 光测悬线; 光测铅垂线; 光测垂线; 光测垂球 | |||
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| 光测垂准器; 光学垂准器; 光测悬线; 光测铅垂线; 光测垂线; 光测垂球 | |||
| optical plumb: 3 phrases in 1 subject |
| Technology | 3 |
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