. (. XIII. 17, ).
.
6=16...20 . 1020 .
Rc .
δ = 30...40 <200250 . , , , 2/ . ,
l ; . . (δ=8...10 ) , (b=160...200 ), , . - .
, - δ =16...20, b .
b, :
.
, H . , ,
[N] b p
- , H , c.
(. XIII. 17, .17,).
. H, .
, . . XIII. 19
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