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在建筑塔式井架时必须检查它的垂直度,对此,传统的测量检查方法不常是有效的。投射垂直方向的现有激光仪不够可靠,并且不能完全满足现代要求。
In building tower derricks it has to be checked for its verticality, for which conventional methods of measuring checks are not always effective. Existing lasers that project in the vertical direction are not reliable enough and can not fully meet the modern requirements.