percentage spread
... percent（age）reduction压下率、压缩率 percentage spread宽展率 percent elongation延伸率、延长率 ...
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带宽扩展率 bandwidth expansion ratio
频率展宽 frequency bandspread
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使用MATLAB编写了数值计算程序，采用二项式拟合的数值方法，总结归纳出了进给速度和宽径比与宽展率之间的解析公式。
Using the binomial fitting method in MATLAB to program numerical calculation program, the analytical formulations between feed speed, width-radius ratio and width spread ratio were deduced.
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