- permanent succession
- permanent summation
- permanent swap file
- permanent threshold shift
- permanent threshold shift，PTS
- permanent tooth
- permanent way overhaul train
- 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