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specific permeability
el. 穿透能力【核】; 单位穿透力
el.mach. 比磁导率; 相对磁导率
eng.geol. 渗透率; 渗透系数
oil 比渗透率
tech. 内渗透性; 内渗透率; 渗水比; 比磁通密度

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