permagn.清洁金属用粉permn.电烫发v.电烫（头发）permeability inversion渗透率反演permeability evolution渗透性演化permanganate titration高锰酸盐滴定法permanganate bleaching高锰酸盐漂白permeability of vacuum真空磁导率permeation coefficient透水系数permanganate permutite锰砂permeability reservoir低渗透油藏permeability indicator磁导系数指示器Permo-Carbonniferous石炭-二叠系