permeability orientation
permeability of tunnel fill material 炮眼充填材料的渗透率 permeability orientation 渗透率方向性 permeability phase-out zone 渗透率异相带 ..
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岩石渗透率具有明显的方向性，因而渗透率是矢量。
The study and practice show that permeability as a kind of vector is closely related to orientations for its scale.
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