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本文分析了双像目镜法测量螺距的原理，指出了测量过程中应注意的问题，并提出了一种提高瞄准精度的新方法．具有一定的实际意义．
This paper analyzes the principle of double eyepiece method to measure the pitch, points out the problems to be noticed in the measurement process, and proposes a new method to improve the aiming accuracy. Has some practical significance.