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零 应力 : 20 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 10 |
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