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| 摄像管〔电视发射管〕寄生信号; 黑点补偿信号 | |||
| 黑斑信号 | |||
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shading signal : 15 phrases in 5 subjects |
| Air defense | 5 |
| Construction | 2 |
| General | 3 |
| Technology | 3 |
| Telecommunications | 2 |
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