即便是樓下說的也有點離譜,金剛鑽比軸承鋼硬是肯定的,但那是磨牙用的,牙多大,軸承多大?切開一顆軸承不得五、六個小時?
即便是樓下說的也有點離譜,金剛鑽比軸承鋼硬是肯定的,但那是磨牙用的,牙多大,軸承多大?切開一顆軸承不得五、六個小時?
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