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| 标记指示符 | |||
| 旗语信号指示器; 旗号; 动作指示器; 标志显示 | |||
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flag indicator : 8 phrases in 4 subjects |
| Aviation | 1 |
| Geology | 1 |
| Geophysics | 5 |
| Oil / petroleum | 1 |
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