level of foundation - loading
- level of foundation
- level of motorization
- level of noise
- level of oil
- level of organization of work
- level of pollution
- level of recording
- level of service
- level of skill
- level of subsoil water
- level of technical competence
- level of unification
- level of wages
- level of water supply
- level of zero annual amplitude
- level regulator
- level section
- level sensor
- level staff
- level stretch of road
