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² ϲ² .

. 7.4 , .

| 2 . F " , F nr] = F nl2 , () :

. 7.4. ,

. 7.4 F r F t .

/ ^ mint .

( ) * 1,8 ... 2,0. ~ 1.

= 1, 0 // . 3.1 10 ... 15%, K Hv . 3.7 . 2.1 .

p np = PiP2 / (Pi + 2)>

ֳ [ (7.8) (7.9)) | . (2.11))

³ , [. (7.18) |,

Y f .

, . , [ ,,] , ( 10 ... 15% ). , o F .

 
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