钻头硬度试验
Bit hardness test
以上为机器翻译结果，长、整句建议使用 人工翻译 。
针对侏罗系地层高硬度、强研磨性等特点，研究并试验了几种特殊类型的钻头。
Considering the characteristics of high degree of hardness, abrasion and high temperature of Jurassic layer, some special bits were investigated and applied.
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