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| 有効面積 (yūkō-menseki) | |||
| 実効面積 (jikkō-menseki) | |||
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эффективная площадь : 8 phrases in 4 subjects |
| Astronautics | 5 |
| Construction | 1 |
| Physics | 1 |
| Radiolocation | 1 |
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