以往计算面域骨架线大多采用栅格方法。
The previous method to create framework lines of area was almost raster.
在输电线路施工中，弧垂观测是架线分部工程中重要的控制项目。
During transmission line construction, sag observation is an important control item of stringing.
在输电线路施工中，弧垂观测是架线分部工程中重要的控制项目。
During transmission line construction, sag observation is an important control item of stringing.
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