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| 波束孔径; 束流孔径; 梁的隙缝 | |||
| 梁口; 射束孔 (径) | |||
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beam aperture : 13 phrases in 6 subjects |
| Air defense | 1 |
| Architecture | 1 |
| Construction | 1 |
| Electronics | 3 |
| Metallurgy | 2 |
| Technology | 5 |
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