短語詞組短語drag bit [地質]刮刀鑽頭;翼狀鑽頭;刮刀鑽頭step type drag bit 堦梯形刮刀鑽頭stepped drag bit 堦梯刮刀鑽頭drag bit drilling 刮刀鑽進blade drag bit 刮刀鑽頭fourway drag bit 四翼刮刀鑽頭way drag bit 四翼刮刀鑽頭stetype drag bit 堦梯形刮刀鑽頭three -winged drag bit 三翼刮刀鑽頭;三翼鑽頭 返回 bit drag