Dry goods, the relationship between geometric angl..

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Dry goods, the relationship between geometric angle of twist drill and sharpening accuracy _ vertex angle | #33

Dry goods, the relationship between geometric angle of twist drill and sharpening accuracy _ vertex angle

Dry goods, the relationship between geometric angle of twist drill and sharpening accuracy _ vertex angle

Original title: Mo Jin Game Record: Four kinds of mining tools, the drill bit and the golden pickaxe are the most powerful, and Xu Li is much more convenient to operate. There is a mining game content in the mini world

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