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应力 幅 : 22 phrases in 9 subjects |
| Automobiles | 1 |
| Bridge construction | 4 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Metallurgy | 3 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Technology | 8 |
| Transport | 1 |
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