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這種絲錐磨成這樣有什么好處? |
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點(diǎn)評(píng)
如果新絲錐0刃到完整刃是4牙,而你刃磨后達(dá)到9牙,也就是說(shuō)。原來(lái)絲錐每牙的切削量縮減為三分之一,省力了。不知對(duì)否
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點(diǎn)評(píng)
正解
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