An analysis is given to the effect of centering error of the mechanical mounting of the masterball in a digital measurement upon the radial motion polar plot of an axis of rotation.
本文主要分析采用数字式测量时，标准测试球的安装偏心对回转轴径向误差运动圆图象的影响。
2
Here's a simple tip that will help you master this shot: Practice hitting low volleys with a tennis ball placed under your hitting arm.
这里有一个小窍门帮助你掌握这种击球方法：夹一个网球在你击球胳膊的腋下来练习低位截击。
3
The basic skills area is a large facility with ample room for your players to master pitchers 'fielding, infield ball handling, outfield communication, catching, and team defense (see figure 12. 1).