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sound operation
| navigation and range
| sound operation | |
| China law | 稳健运行 |
| navigation and range | |
| gen. | 指挥飞行的雷达系统; 无线电空中航行操纵系统 |
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| 稳健运行 | |||
| sound operation: 8 phrases in 6 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| China | 2 |
| Drilling | 2 |
| Navigation | 1 |
| Oil / petroleum | 1 |
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