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| 有效截面积 | |||
| 有效截面面积 | |||
| 有效截面面积 | |||
| effective sectional area: 9 phrases in 5 subjects |
| Architecture | 1 |
| Bridge construction | 3 |
| Metallurgy | 1 |
| Nautical | 1 |
| Technology | 3 |
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