The formulation is applicable to the production of the air percussion bit tooth material.
本发明适用于空气冲旋钻头牙齿材料的生产。
Penetration Mechanism of DTH Percussion Compact Drilling and Experimental Research on Compact Bit; closed cell elastomeric insulation
潜孔锤冲击挤密钻进机理及挤密钻头的设计与实验研究
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