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( } 0,64 . D 20 , d = 8 . w, S Sr 1 2 . . 2. : D + d=20 + 8 = 28 = = 2,8 : D/d = 20:8 = 2,5. "D+d" "D/d" ( . 2 ). L, L = 0,64 , w, 6,5. D + d, D/d L ( ) 10 100 , w 10 100 .
S, , : S>=Sr = (D d)/4w; d = (D d)/2w. 0,5; 0,75; 1.0; 1.25; 1,5 . .
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