This article mainly introduces the method that adopts gear caliper to measure the mediandiameter normal tooth thickness of double-line trapezoidal thread.
本文主要介绍了采用齿轮卡尺测量双线梯形螺纹中径法向齿厚的方法，同时也测量出螺距产生的误差。
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When the purity of potassium sulfate crystal is lower and the content of the potassium phosphogypsum is higher, the mediandiameter of crystal particle and the density of suspension are higher.