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一、前言石油和矿山用三牙轮钻头是开发矿业和油田的重要工具。钻头质量的优劣直接关系到开发矿业和油田的速度、成本以及改善工人劳动
I. Introduction Three tricone bits for oil and mining are important tools for developing mining and oil fields. The quality of the bit is directly related to the speed and cost of developing the mining and oil fields and improving the labor of the workers