Cutting from radial line across the profileline at the nape. Do the same on the opposite side.
对角线一直修剪到超过后区轮廓线，另外一侧用同样的方法。
2
The appropriate application of bold profileline stipulated in GB/T17453 was discussed, and the difference between this representation and black spreading representation was, then, pointed out.
提出GB/T17453中加粗轮廓线表示法的应用场合及其与涂黑表示法的根本区别。
3
Note that each profile must appear on a separate line.