quen - reco
- ratio control system
- ratio meter
- rational rolling schedule
- rattail
- rattle barrel
- rattling
- ravages of corrosion
- raw casting
- raw coal
- raw concentrate
- raw density
- raw film
- raw gas main
- raw liquor
- raw magnesite
- raw material
- raw materials preparation
- raw matte
- raw steel
- raw water
- raw-material bay
- raw-material hopper
- raw-material storage
- raw-materials beneficiation
- raw-materials storage facilities
- raw-materials transfer station
- raw-ore stockyard
- raw-stock drier
- ray axis of crystal
- Rayleigh wave
- RB
- rc
- rcdoxpotential
- rcpn
- RE
- reacting mass
- reaction
- reaction furnace
- reaction indicator
- reaction kinetics