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visual-signal
| transmitter
| visual signal | |
| tech. | 形示信号; 指示信号; 直观信号; 光信号; 可视信号; 视距信号 |
| telecom. | 可见信号; 视频信号; 图像信号 |
| transmitter | |
| IT | 发射机 |
| |||
| 视觉频信号 | |||
| 形示信号; 指示信号; 直观信号; 光信号; 可视信号; 视距信号; 影像信号 | |||
| 可见信号; 视频信号; 图像信号 | |||
| 目视信号; 视觉信号 | |||
| visual-signal: 21 phrases in 9 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Construction | 1 |
| Electronics | 2 |
| Geophysics | 1 |
| Information technology | 1 |
| Nautical | 5 |
| Technology | 6 |
| Telecommunications | 3 |
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