Protein-vitamin-mineral and amide-vitamin-mineral additives. Methods for the determination of retinol-acetate (vitamin A), argokalciferol (holekalciferol) (vitamin D), tocopherol-acetate (vitamin E)
State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring the ratio error and phase displacement of a.c. power frequency voltage in the range from 0,1/V3 to 750/V3 kV
