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upper area control
| centre
| upper area control | |
| avia. | 高空区域管制 |
| centre | |
| gen. | 中; 中间; 中枢; 中心区 |
| dart. | 圆心 |
| geol. | 中心 |
| met. | 心部 |
| sport. | 中央 |
| tech. | 中心 |
| |||
| 高空区域管制 | |||
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upper area control centre : 6 phrases in 3 subjects |
| Aviation | 4 |
| Electronics | 1 |
| Technology | 1 |
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