All gun drills are straight-fluted, and each has a single cutting edge.
所有深孔钻都是直出屑槽的，并且均为单切削刃。
The cutting tool may have a single cutting edge or may have many cutting edges.
刀具可能只有一个刀刃或者可能有多个刀刃。
With brown, white fused alumina compared to high hardness, toughness, showed a single particle spherical crystal, has a good multi-row cutting edge, strong anti-crushing.
与棕，白刚玉相比硬度高，韧性大，呈单颗粒球状晶体，具有良好的多棱切削刃，抗破碎较强。
With brown, white fused alumina compared to high hardness, toughness, showed a single particle spherical crystal, has a good multi-row cutting edge, strong anti-crushing.
与棕，白刚玉相比硬度高，韧性大，呈单颗粒球状晶体，具有良好的多棱切削刃，抗破碎较强。
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