( ... ... ), - , . , ( ) Dtk = Ek×n, Dtk - , ?; n - . Ek . Ek : , 1,86, 5,07, 3,90, 4,63, 7,27. Ek, =1×1000/2Dtk, P1 P2 - . Dt . . Ek , .

.: . ., , 4 ., ., 1969; , 2 ., . 3, .- ., 1964, . 485.

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