[KongchangAI]
Unverified80% confidenceTradeoffTime unknown

配件钻头越多的套装看起来划算,但廉价套装的钻头材质差、易磨损打滑,实际常用的就4-6种;宁选钻头少但材质好(如高速钢/钨钢)的套装

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