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| foot mat; subbase course | |||
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底垫层 : 14 phrases in 6 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Technology | 6 |
| Textile industry | 1 |
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