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| 覆盖层厚度; 表层厚度 | |||
| 覆盖深度 | |||
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overburden depth : 13 phrases in 5 subjects |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Technology | 7 |
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