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| 光信号; 视光标志 | |||
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| 光信号; 视光标志 | |||
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optical signal : 37 phrases in 8 subjects |
| Aviation | 4 |
| Electronics | 7 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Space | 2 |
| Technology | 20 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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