A.北西60° B.南西60° C.南東60° D.北東60°
A.5.568 B.-5.568 C.43.940 D.-43.940
A.a=6378140,α=1/298.257 B.a=6378245,α=1/298.3 C.a=6378145,α=1/298.357 D.a=6377245,α=1/298.0