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从深孔的母线直线度与轴线直线度之间的关系入手，论述了在火炮身管直线度测量中，如何通过测量母线直线度求得轴线直线度的原理和方法。给出的母线与轴线直线度误差及误差消除的方法，对深孔直线度的测量具有一定的实用价值。
Starting from the relationship between the straightness of the busbar and the straightness of the axis in the deep hole, the principle and method of obtaining the straightness of the axis by measuring the straightness of the busbar are discussed. Given the busbar and axis straightness error and error elimination method, the measurement of deep hole straightness has a certain practical value.