bit drag

短语词组

短语

• drag bit [地质]刮刀钻头;翼状钻头;刮刀钻头
• step type drag bit 阶梯形刮刀钻头
• stepped drag bit 阶梯刮刀钻头
• drag bit drilling 刮刀钻进
• blade drag bit 刮刀钻头
• fourway drag bit 四翼刮刀钻头
• way drag bit 四翼刮刀钻头
• stetype drag bit 阶梯形刮刀钻头
• three -winged drag bit 三翼刮刀钻头;三翼钻头
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