Fig. 17.
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T
a
C
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Fig. 26.
P
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d
f
A
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จาก
T
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Fig.18.
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Fig.27.
n.
ab
A
rg
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or n
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Jox
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Fig. 17.
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Fig. 26.
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S
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d
f
A
Π
จาก
T
D
Taf.W
Fig.18.
C
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M
1
1
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N
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Fig.27.
n.
ab
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rg
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n
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or n
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N
S
N
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f
f'
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Jox
M
M'