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| 孔隙密度 | |||
| 空穴密度 | |||
| hole density: 9 phrases in 5 subjects |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Geophysics | 3 |
| Shipbuilding | 1 |
| Technology | 1 |
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