The experiment has proved that it may inprove accuracy of measurement greatly to design reasonably concentrated ball collar-the critical nart of manufacturing core shaft.
经过实践证明，合理设计芯轴的制造关键部分———密珠套，可以大大地提高测量精。
The experiment has proved that it may inprove accuracy of measurement greatly to design reasonably concentrated ball collar-the critical nart of manufacturing core shaft.
经过实践证明，合理设计芯轴的制造关键部分———密珠套，可以大大地提高测量精。
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