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| 标志电路 | |||
| 标志器电路; 标志脉冲电路; 频标电路 | |||
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marker circuit : 7 phrases in 5 subjects |
| Air defense | 1 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 1 |
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