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標(biāo)準(zhǔn)麻花鉆的刃磨技巧 |
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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(zhuān)拿新的鉆頭練手,、、,、,、、呵呵,,為這事老師天天掂對(duì)我,!
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點(diǎn)評(píng)
肯定是磨錯(cuò)了,將鉆頭刃磨錯(cuò),,重磨過(guò)就成,。
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