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, c , . . S . . S =Sn+S; Sn=0,278n U tn Sn -c . S - . 1/ = 1000/3600=0,278/. U- . tn- . .. , . . , ,.. .. , , . , , . , . . 290-300/. , , ..330/. . 1 1/. 1 , 8/. , . , .., . , 50-70/.