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 return value also specifies the width and height of the imageable area.
传回值也会指定可做为影像之区域的宽度和高度。
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