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3 диапазона рабочих температур, в него введены по крайней мере еще один элемент II труппы . 4 2. Катод по п. 1, отличающийс тем, что элементы II группы введены в количестве 0,1-35 ат. %.3 operating temperature ranges, at least one more element of the II group has been entered into it. 4 2. The cathode of claim 1, wherein the elements of group II are introduced in an amount of 0.1-35 at. %