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| 罗盘补偿; 罗经校正 | |||
| 罗盘校正; 罗差补偿 | |||
| 罗盘自差校正; 罗盘自差补偿 | |||
| 罗经自差补偿 | |||
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compass compensation : 2 phrases in 2 subjects |
| Aviation | 1 |
| Technology | 1 |
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