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俯视显微照片显示了刀具的切削刃和前刀面。
The top view micrographs show the cutting edge and the rake face of the tools.
youdao
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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
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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