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標(biāo)準(zhǔn)麻花鉆的刃磨技巧 |
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為啥,?
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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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