... 条件平差condition adjustment 铁路工程测量railroad engineering survey 通用横墨尔卡投影Universal Transverse Mercator projection ...
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railroad d engineering survey 铁路工程测量
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Nowadays, in mountain railroad engineering survey, the efficiency of traditional leveling method is low, is very difficult to practice because of terrain undulation being big.
目前在山区铁路工程测量过程中，由于地形起伏较大，传统的水准测量效率低，非常难以实施。
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