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| 结构缺陷: 15 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Electronics | 1 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Finances | 1 |
| General | 1 |
| Metallurgy | 2 |
| Technology | 4 |
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