所有深孔钻都是直出屑槽的，并且均为单切削刃。
All gun drills are straight-fluted, and each has a single cutting edge.
这类钻头可以有三条或四条出屑槽及相同数量的保证良好导向的导向边，这样使得加工有高精度。
This type of drill may have either three or four flutes and equal number of margins, which ensure superior guidance, thus resulting in high machining accuracy.
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