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| 回波区; 反射区; 反射表面; 反射面积 | |||
| 目标反射面积 | |||
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| 回波区; 反射区; 反射表面; 反射面积 | |||
| 回波面积 | |||
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echoing area : 12 phrases in 6 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Electronics | 2 |
| Metallurgy | 2 |
| Space | 2 |
| Technology | 2 |
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