State system for ensuring the uniformity of measurements. State verification scheme for measuring instruments of sound pressure in water within frequency range from 1*10 -3 to 1*10 6 Hz
Yttrium, lanthanum, ytterbium, lutetium and their oxides. Chemical-spectral method of determination of impurities of vanadium, tungsten, iron, cobalt, manganese, copper, molybdenum, nickel, niobium, lead, tantalum, titanium and chromium
