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| 物标; 视觉信号 | |||
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| 光标; 光学标记 | |||
| 光学测标 | |||
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| 物标; 视觉信号 | |||
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| 光学测标 | |||
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optical marking : 33 phrases in 12 subjects |
| Agriculture | 1 |
| Automobiles | 2 |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 1 |
| Computers | 2 |
| Electronics | 4 |
| Exhibitions | 1 |
| Information technology | 2 |
| Space | 4 |
| Technology | 13 |
| Telecommunications | 1 |
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