permagn.清洁金属用粉permn.电烫发v.电烫（头发）permanganic anhydride高锰酸酐Permo-Carboniferous石炭二迭过渡期permanet magnet motor永磁电机Permeability diarrhea渗透性腹泻permeability concrete透水性混凝土permeability globulin通透性球蛋白permeabglity manomete渗透压计permafrost degradation冻土退化permanganate potassium高锰酸钾, 过锰酸钾permenant road surface永久性路面