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| ground visibility (由专职观察员报告的或跑道能见距离测定仪测定的地面主要范围能见度) | |||
| surface visibility | |||
| ground visibility | |||
| control-tower visibility | |||
| 地面能见度: 2 phrases in 2 subjects |
| Aviation | 1 |
| Nautical | 1 |
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