“eccentric reaming bit”的概念、定义、翻译、参考文献-科学参考

单词	eccentric reaming bit
释义	eccentric reaming bit Encyclopedia 工学钻井装备释 eccentric reaming bit偏心扩眼钻头常规阶梯钻头的扩眼部分的旋转轴线偏离钻柱旋转轴线一定距离，假想存在一个以钻柱旋转轴线为中心线直径等于的圆柱，仅保留扩眼部分在假想圆柱内的刀翼，同时领眼部分和上部钻柱也必须落在假想圆柱内的结构限制的钻头。
随便看	permanent way tamping machinery Permanent wilting point permanganate index permatron permeability permeability blind zone permeability calculation permeability coefficient permeability determination method permeability effect permeability heterogeneity intensity permeability, magnetic conductivity permeability measurement permeability of biological tissue permeability of concrete permeability of drug permeability of free space permeability of ore permeability of shelterbelts permeability of soil permeability of soils permeability of vacuum permeability of wood permeable membrane permeable rate of rock mass

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