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2642.11-97

po po
- po
.

   
   2009-04-15
   2009-05-01
   2000-07-01
    . a
   Refractories and refractory raw materials. Method for determination of potassium and sodium oxides
    po a , (, , po) , , , , - a -po a 0,1% 5%
 2642.11-97 2642.11-97