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粗 糙系数 : 36 phrases in 13 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Bridge construction | 1 |
| Earth sciences | 2 |
| Engineering geology | 2 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Hydroelectric power stations | 3 |
| Metallurgy | 2 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Technology | 17 |
| Wind Energy | 1 |
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