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当量直径 : 21 phrases in 9 subjects |
| Aviation | 2 |
| Construction | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Refrigeration | 2 |
| Shipbuilding | 1 |
| Technology | 8 |
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