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| apparent horizon (线); apparent level | |||
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视水平 : 30 phrases in 10 subjects |
| Aviation | 1 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Remote sensing | 2 |
| Space | 2 |
| Surgery | 1 |
| Technology | 18 |
| Telecommunications | 1 |
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