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.

youdao

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.

youdao