When crack width changes from wide to narrow, the K does not immediately minish, but continuously enlarges first, reduces then, and does not return in original route.
当裂纹宽度从大到小时，K值不是立刻减小，而是先继续增大，然后再减小，并且不是按原路线返回。
SPWM is a set of constant amplitude but unconstant width rectangular serial pulse produced by control return circuit to approximate sinusoidal voltage waves.
(正弦脉宽调制)是由控制回路产生一组等幅而不等宽的矩形脉冲列，用来近似正弦电压波。
The conveyer can not only work in a long distance and ultra width, but also ensure the return stroke of the belt is stable, and meet the use requirements of large conveying capacity.
该输送机不仅能长距离超宽运行，还能保证皮带回程平稳，满足输送量大的使用要求。
The conveyer can not only work in a long distance and ultra width, but also ensure the return stroke of the belt is stable, and meet the use requirements of large conveying capacity.
该输送机不仅能长距离超宽运行，还能保证皮带回程平稳，满足输送量大的使用要求。
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