refractivity refractometer refractometry refractor refractories refractory refractory alloy refractory brick refractory cement refractory clay refractory concrete refractory-faced refractory lining refractory material refractory metal refractory mortar refractory setting refractory surface refractory tube refractory wall |
refractivity пречупване рефракция Търсената дума е намерена |