(1
(2
(3
%& '" ( 111111010100 :!" #
(4
∆≈
=
→
2
ℎ
= 10
=
4=
1000
2
→
2 = 250 →
≅8
2 ∆
ℎ
(
ℎ
)! " = 20#
→ 20 = 20
(1/ℎ) →
'()* = 6B + 10.8 − 20log h = 6B + 10.8 + 20 = 80 →
1
= 10 → h = 0.1
h
=
49.2
>8→
6
=9
(5
/% : ( + ,( -.
0 ,12 :+( + ,( -.
3
:+
+ ,( -.