1 A B C 2 A B C 3 1 A B C
1 7
1 6000000 1 4000000
S S1 S2 = n
A B B B B A A A B A A A A C B B A A A A A C A A B C A A B B A A B C B B C C A A
66.5
CO N.P.D
% 99.8 94.1 85.3 99.7 98.6 62.8 90.0
150 12 ( ) = 2( ) 15 H = 90 ϕ δ = 90 23 26' 0 = 76 34'
0 0
A B C D