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| 地理垂线 | |||
| 铅垂线; 地下垂线; 地球表面法线方向; 地平经圈; 大地水准面法线方向 | |||
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| 地理垂线 (大地水准面法线的方向线) | |||
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geographic - vertical : 1 phrase in 1 subject |
| Aviation | 1 |
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