即便是楼下说的也有点离谱,金刚钻比轴承钢硬是肯定的,但那是磨牙用的,牙多大,轴承多大?切开一颗轴承不得五、六个小时?
即便是楼下说的也有点离谱,金刚钻比轴承钢硬是肯定的,但那是磨牙用的,牙多大,轴承多大?切开一颗轴承不得五、六个小时?
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