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钻孔扩底钻具,乃当前之急需。本文简介了两种扩底钻具的适用范围、性能及其优缺点,供同行们在科研、使用中参考、借鉴。
Drilling and drilling of bottom drilling tools is an urgent need at present. This article introduces the scope of application, performance and advantages and disadvantages of the two types of bottom-drilling tools for the reference and reference of colleagues in scientific research and use.