图9. 四方位与八方位切割效果对比 a—四方位切割的区域场(上)及局部场(下);b—八方位切割的区域场(上)及局部场(下)
Fig.9. Comparison of cutting effect between four and eight positions a—regional field (upper) and local field (lower) cut by the square;b—regional field (upper) and local field (lower) cut by octagonal position