四轴后处理，怎么样来做才能显示角度A

四轴后处理，为什么没有角度A出来？？


G40 G17 G90 G71
G91 G28 Z0.0
T00 M06
G00 G90 X7.572 Y-9.835 A0.0 S0 M03
G43 Z-4.294 H00
G01 X7.558 Y-6.7 Z-3.018 F250. M08
X7.161 Y-6.767 Z-2.851
X6.949 Y-6.801 Z-2.761
X6.843 Y-6.818 Z-2.716
X6.79 Y-6.826 Z-2.694
X6.763 Y-6.83 Z-2.683
X4.87 Y-7.072 Z-1.866
X2.151 Y-7.242 Z-.662
X-.568 Y-7.209 Z.552
X-3.287 Y-6.974 Z1.743
X-6.007 Y-6.544 Z2.877
X-8.726 Y-5.931 Z3.924
X-11.445 Y-5.152 Z4.855
X-14.164 Y-4.229 Z5.643
X-16.884 Y-3.187 Z6.265
X-19.603 Y-2.056 Z6.705
X-22.322 Y-.868 Z6.951
X-25.042 Y.345 Z6.995
X-27.761 Y1.548 Z6.836
X-30.48 Y2.708 Z6.479
X-33.2 Y3.792 Z5.934
X-35.917 Y4.772 Z5.214
G00 Z7.673
X-35.916 Y6.925