... deviation 偏差，偏向 deviation of plumb line 垂线偏差 deviation of tidal level 潮位偏差 ...
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It also describes the new techniques and the results drilling tracing of deviation correction in the construction of the bottom of the plumb line hole. Finally, several views are out forward.
介绍了垂线孔孔底随钻跟踪定向纠偏新技术和施工效果，最后结合实例谈几点认识。
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