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| operating depth | |||
| operational altitude; operational height; working height | |||
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| operational height | |||
| 工作 高度: 26 phrases in 12 subjects |
| Air defense | 1 |
| Automobiles | 5 |
| Aviation | 1 |
| China | 5 |
| Commerce | 1 |
| Drilling | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 3 |
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