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| minor principal stress | |||
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小主 应 力 : 16 phrases in 7 subjects |
| Bridge construction | 2 |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 2 |
| Space | 1 |
| Technology | 6 |
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