短語詞組短語drag bit [地質(zhì)]刮刀鉆頭;翼狀鉆頭;刮刀鉆頭step type drag bit 階梯形刮刀鉆頭stepped drag bit 階梯刮刀鉆頭drag bit drilling 刮刀鉆進(jìn)blade drag bit 刮刀鉆頭fourway drag bit 四翼刮刀鉆頭way drag bit 四翼刮刀鉆頭stetype drag bit 階梯形刮刀鉆頭three -winged drag bit 三翼刮刀鉆頭;三翼鉆頭 返回 bit drag