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標(biāo)準(zhǔn)麻花鉆的刃磨技巧 |
點(diǎn)評(píng)
為啥?
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點(diǎn)評(píng)
鉆頭刃磨需要多實(shí)踐!記得上學(xué)時(shí)候,專拿新的鉆頭練手、、、、、呵呵,為這事老師天天掂對(duì)我!
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