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。
we asked. 'Measuring the relative speed and angles of the balls, the distances to the pocket and final placement of the white ball?'
我们问，“测算球的相对速度和角度，判断白球到球袋的距离以及最后的位置呢？
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。
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