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71
()
2
12
48
Sd
c
K
Gu
λ+ µ
=σ−σ =
µλ+µ
, (16.5)
S
σ
—
d
σ
— -
71
1 S
4
(
G = σ −σ u =
d
)
K c 2 λ + 2µ
8µ λ + µ
, (16.5)
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