A new method of measuring indoor radioactivity of radon is presented by using the indoor fast-moving ball as the sample of a radioactive substance.
给出了一种用室内快速运动的球体作为放射性样品测量室内氡射气辐射活度的新方法。
A principle and method for error measuring, compensation and control of grinding processes of ball screws is described.
介绍滚珠丝杠精磨误差的实时测量、补偿和控制的原理和方法。
This paper introduces the method of simple conversion measuring and calculation for gear rack thickness with depthometer as prime measuring tool and measuring Pin, measuring ball as auxiliary tool.
介绍了以深度尺为量具，以棒、球为辅件的齿条齿厚简易转化测量与计算方法。
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