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| effective cross-sectional area | |||
| effective sectional area | |||
| net sectional area | |||
| 有 效截面面积: 23 phrases in 9 subjects |
| Air defense | 1 |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 4 |
| Electric machinery | 3 |
| Metallurgy | 5 |
| Oil / petroleum | 1 |
| Technology | 6 |
| Textile industry | 1 |
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