27277| 97
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磨鉆頭學(xué)問大 |
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點評
非書本所能傳授,必躬親于實踐
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點評
磨臺階鉆得先用外圓磨磨到所需尺寸,然后用工磨磨后角(也可直接用手拿著磨),其它幾種鉆頭基本都得憑手上功夫來修磨了。
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