i12=z2/z1=40/20=2
d1=mz1=2.5×20=50mm
d2=mz2=2.5×40=100mm
a=（d1+d2）/2=75mm
da1=d1+2mha*=50+2×2.5×1=55mm
da2=d2+2mha*=100+2×2.5×1=105mm
df1=d1-2m（ha*+c*）=50-2×2.5×（1+0.25）=43.75mm
df2=d2-2m（ha*+c*）=100-2×2.5×（1+0.25）=93.25mm
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